Lathem Time Clock LTR4 512 User Manual

LTR4-512

LTR8-512

LTR8-512M

MASTER CLOCK

Installer’s Guide

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Table of Contents

WELCOME

PARTS LIST

MOUNTING THE MASTER

Surface Mount ...........................................................................................................................3

Semi-Flush Mount......................................................................................................................4

Lowering the Display Unit during Testing ...............................................................................4

Rack Mount ...............................................................................................................................6

Hidden Power Supply Mount ....................................................................................................7

WIRING THE MASTER

SETTING UP THE MASTER

Enter your Password ...............................................................................................................11

Set the Date and Time .............................................................................................................12

Enable the Relays ....................................................................................................................13

Choose the Clocks to Synchronize...........................................................................................13

Manual Bell Control................................................................................................................14

Auto Test the Bells...................................................................................................................15

Set Daylight Savings ................................................................................................................15

Setup Communications (LTR8-512 and LTR8-512M only)....................................................15

FUNCTIONS DEFINED

Quick Check Commands.........................................................................................................17

Quick Check Command [*] Status..........................................................................................17

Quick Check Command [1] Edit Keys....................................................................................17

Quick Check Command [3] 12/24 Hour Display ....................................................................17

Program Keys..........................................................................................................................17

[0] = Password..........................................................................................................................17

[1] = Set Date and Time...........................................................................................................18

[2] = Select Clock Control .......................................................................................................18

[3] = Manual Bell Control .......................................................................................................18

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[4] = Program Schedules..........................................................................................................18

[5] = Schedule Changes............................................................................................................19

[6] = Enable or Disable Circuits..............................................................................................19

[7] = Daylight Savings Time ....................................................................................................19

[8] = Change Schedule.............................................................................................................19

[9] = Sync Clocks .....................................................................................................................20

[A] = Program Holidays ..........................................................................................................20

[B] = Communications (LTR8-512 and LTR8-512M Only) ..................................................20

[C] = Change Password ...........................................................................................................20

[D] = Time Calibration (Available with Firmware Version 5.02).........................................21

Auto Bell Test ..........................................................................................................................22

APPENDIX A - SPECIFICATIONS

APPENDIX B – DAYLIGHT SAVINGS COUNTRY CODES

APPENDIX C - SECONDARY CLOCK TYPE CODES

WIRING SECONDARY CLOCKS ........................................................................................26

APPENDIX D - WIRING DIAGRAMS

Fig. D1 - TERMINAL BLOCK ‘P4’.......................................................................................42

WIRING THE LTRx-512 FOR 120VAC (nom.) OPERATION ..........................................42

WIRING THE LTRx-512 FOR 220/240VAC (nom.) OPERATION....................................42

Fig. D2 - TYPICAL SIGNAL DEVICE WIRING...................................................................43

Fig. D3 - COMPUTER CABLE..............................................................................................43

Fig. D3 - COMPUTER CABLE..............................................................................................44

Fig. D4 - RS-232 CABLE ........................................................................................................44

Fig. D5 - SYNCHING UP TO 60 RS-485 TIME SYNC DEVICES .......................................45

Fig. D6 - LTRx-512 USED AS SLAVE TO ALLOW 30 EXTRA RS-485 .............................45

Fig. D7 – COMMUNICATION TERMINAL BLOCK..........................................................46

Fig. D8 - POWER SUPPLY TERMINAL BLOCKS .............................................................48

APPENDIX E – INSTALL THE OPTIONAL MODEM

APPENDIX F – CONNECTING THE LTR-RSS (REMOTE SCHEDULE SELECTOR)

APPENDIX G – CONNECTING THE LTR-GPS (SATELLITE RECEIVER / SYNCHRONIZER)

APPENDIX H – POWER SUPPLY SCHEMATICS

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LTRx-512 Installer’s Guide

Welcome

This Installer’s Guide covers three different Master Clocks. The LTR4-512, the LTR8-512

and the LTR8-512M. All three units are installed and programmed in similar fashions. The main

difference between the three units is the LTR4-512 has 4 circuits that can be programmed to ring

bells or activate circuits for up to 99 seconds and/or synchronize the time on two types of clock

systems (any clock systems types listed in Appendix B, plus RS-485 time sync devices). The

LTR8-512 and LTR8-512M have 8 circuits that can be programmed to ring bells or activate

circuits for up to 99 seconds and/or synchronize the time on three types of clock systems (any two

clock system types listed in Appendix B, plus RS-485 time sync devices). You can program up to

512 events to activate a single or multiple circuits on a given day and time. The LTR8-512 and

LTR8-512M can also connect to a PC running Microsoft Windows using the optional LTR

MasterLink software. The LTR8-512M has a built in Modem capable of communicating with the

PC or for synchronizing with the NIST Atomic Clock.

Unless otherwise specified, LTRx-512 refers to all units. Information that applies to specific

units will be noted.

The list below describes the functions that you can set for this Master:

•

Passwords

Date and time

Clock types to sync

Manual bell control (example: sounding a fire alarm)

Bell schedules (with events lasting up to 99 seconds)

Dates when automatic schedule changes go into effect

Manual circuit disabling (example: for safety during maintenance)

Daylight savings time features

Instant bell schedule changes

Instant clock synchronization

Holiday schedules

Communications when using the LTR MasterLink software with your Master, an RS-485

network or modem access (LTR8-512 and LTR8-512M only)

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LTRx-512 Installer’s Guide

Parts List

Please check that you received all the parts needed to setup your Master:

•

Master Clock (ready to surface mount)

User’s Guide & Installer’s Guide

Installation Hardware Kit

Package of quick-connects

Package of mounting screws and 2 extra cover screws

Also included with the LTR8-512 and LTR8-512M

•

2 L-brackets (ears), used to rack mount

•

Power supply box cover, used to mount in a rack or with a hidden power supply

Optional parts:

•

Connection cable to mount the power supply up to 8 feet from display unit

LTR MasterLink software to control the Master from a computer (LTR8-512 and LTR8-

512M only)

•

Internal Modem (LTR8-512 only)

LTR-RSS Remote Schedule Selector switch (LTR8-512 and LTR8-512M only)

Rack Mount hardware kit for the LTR4-512

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LTRx-512 Installer’s Guide

Mounting the Master

The Master comes ready to surface mount on the wall. However, you can also install the Master

in a standard 19" rack, recess the power supply into the wall or hide the power supply in the floor

or ceiling and hang only the display unit on the wall with optional hardware.

A qualified electrician who understands the electrical code in your area should install your Master.

The installation should not require any special tools, but may require extra hardware, wire, etc. as

required by your local electrical code.

Surface Mount

Power Supply Box

Wall Mount Cover

Display Unit

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LTRx-512 Installer’s Guide

To surface mount the Master

•

Place the Master on its back with the display unit facing up and the keypad to the right

Remove the two screws from just above the display unit

Lift the display unit up and away from you. Note that two rivets at the bottom of the

cover prevent you from lifting it straight up

•

Unplug the ribbon power cable from the back of the display unit

Set the display unit aside

Place two wall anchors and #8 screws 10 inches apart and level on the wall where you

want to mount the Master

•

If needed, place two wall anchors 5 inches below the first two screws

Hang the power supply onto the top two screws using the keyholes on the back

Screw two more #8 screws through the two holes at the bottom of the power supply into

the wall anchors

•

Follow the wiring steps in the next chapter

Reconnect the ribbon cable

Replace the display unit using the two screws that you earlier removed

Semi-Flush Mount

You can set the power supply portion of the Master into the wall. See the steps below and

refer to the Surface Mount drawing to semi-flush mount your Master. A competent electrician

should mount the Power Supply Box inside the wall

To recess the Master in the wall

•

Place the Master on its back with the display unit facing up and the keypad to the right

Remove the two screws from just above the display unit

Lift the display unit up and away from you. Note that two rivets at the bottom of the

cover prevent you from lifting it straight up

•

Unplug the ribbon power cable from the back of the display unit

Set the display unit aside

The power supply measures 12" wide x 6" high x 3 3/8" deep. The cover extends ½"

around the 12" x 6" dimensions. Cut a hole roughly 12¼" x 6¼" in the wall between two

studs where you want to hang your Master

•

Cut two blocks of wood for filler and attach them to the studs

Using the two holes on each side of the power supply, screw it to the blocks

Follow the wiring steps in the next chapter

Plug the ribbon cable

Replace the display unit using the two screws that you earlier removed

Lowering the Display Unit during Testing

With a Semi-Flush or Surface mount, you can hang the display unit below the back box when

testing the Master and its circuits. To lower the display unit, remove the two screws that

attach the display unit to the back box. Lift the unit up and away from the back box, leaving

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LTRx-512 Installer’s Guide

the ribbon cable plugged in. For Semi-Flush mounts, remove the green communications plug

from the back of the display unit, so it can sit flat against the wall. Swing the two hooks on

the back of the unit up and hook them over the bottom edge of the back box. You can use the

keypad to turn on circuits or program the Master, as well as access the relay and connector

blocks inside the back box

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LTRx-512 Installer’s Guide

Rack Mount

The LTR8-512 and LTR8-512M come with two L-shaped brackets (optional on the

LTR4-512) so you can install your Master in a standard 19-inch rack

Power Supply Box

Brackets

Display Unit

To install the Master in a 19-inch rack

•

Place the Master on its back with the display unit facing up and the keypad to the right

Remove the two screws from just above the display unit

Lift the display unit up and away from you. Note that two rivets at the bottom of the

cover prevent you from lifting it straight up

•

Unplug the ribbon power cable from the back of the display unit

Set the display unit aside

Detach the display unit from the wall mount cover by removing the 4 screws on the back

of the display unit (IMPORTANT: These screws are the correct length so they do not

interfere with the circuit board inside the display unit. Using any other screws voids any

warranty)

•

Remove the rectangular knockout near the top of the power supply

Using the 4 screws that you removed from the display unit, attach the display unit to the

side of the power supply. You can fit a #1 Philips screwdriver with an 8 inch blade

through the holes opposite the 4 screw holes

•

Plug the ribbon cable from the power supply into the display unit

Remove the two screws from the side of the display unit

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LTRx-512 Installer’s Guide

•

Using these same screws, attach an “L” bracket (or ear)

Repeat to attach the other ear

Mount the unit in the rack

Follow the wiring steps in the next chapter before attaching the box cover

Attach the furnished cover to the power supply using four 6-32 screws (two of these

screws you removed from the display unit)

Hidden Power Supply Mount

You can hide the power supply portion of the Master above a dropped ceiling, under a raised

floor or behind a wall, up to 8 feet away from the display unit. This allows you to hide the

cables and gives a more pleasing look to your Master. To mount the Master this way, you

must purchase the 8-foot connection cable

Power Supply Box

8 foot cable

(optional)

Display Unit

To hide the power supply

•

Place the Master on its back with the display unit facing up and the keypad to the right

Remove the two screws from just above the display unit

Lift the display unit up and away from you. Note that two rivets at the bottom of the

cover prevent you from lifting it straight up

•

Unplug the ribbon power cable from the back of the display unit

Set the display unit aside

Detach the display unit from the power supply cover by removing the 4 screws on the

back of the display unit (IMPORTANT: These screws are the correct length so they do

not interfere with the circuit board inside the display unit. Using any other screws voids

any warranty)

•

Unplug the ribbon cable from the power supply board

Remove a knockout in the power supply and pass the 8-foot connection cable through it

using proper strain relief hardware. When properly installed, the cable will face away from

the transformer

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LTRx-512 Installer’s Guide

Note: UL regulations require that you do NOT place high voltage (120V) and low

voltage communication cables in the same conduit or through the same knockout holes

•

Follow the wiring steps in the next chapter

For the cleanest installation, mount the display unit over a standard “double gang” 4-inch

electrical box

•

Route the other end of the 8-foot connection cable to this electrical box

Place two #8 screws, 12 inches apart and level, ½-inch down from the top of the electrical

box

•

Connect the 8-foot connection cable and any communication cables to the display unit

Check your connections, then turn your Master on using the On/Off switch on the power

supply board

•

Attach the furnished cover to the power supply using four 6-32 screws (two of these

screws you earlier removed from the display unit)

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LTRx-512 Installer’s Guide

Wiring the Master

•

Wire the display panel and power relay units for bell control and clock synchronization. Refer

to the diagrams in Appendix D for more details. Until you complete this part of the wiring,

do not turn on the AC power to P4, and keep the power/relay unit’s toggle switch

turned “OFF” (Note: The LTR4-512 does not contain Terminal Block P3)

POWER SUPPLY

This is terminal block P4. See the

drawings below for a closeup of wiring

for 120VAC or 220/240VAC

TERMINAL BLOCK ‘P4’

WIRING THE LTR8-512

TERMINAL BLOCK ‘P4’

WIRING THE LTR8-512

FOR 120VAC (nom.) OPERATION

J1 installed between 3 & 4 and J2

installed between 5 & 6

FOR 220/240VAC (nom.) OPERATION

J1 installed between 4 & 5

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LTRx-512 Installer’s Guide

•

Your Master is already setup for 120VAC operation. If you need to wire it for 220/240VAC,

change the jumper settings as shown in the drawings above

We recommend using stranded wire inside the Power

Supply Box. Stranded wire allows for a firm connection to

the Quick Connect terminals. Stranded wires are also less

likely to interfere with the relay board components. If you

must use solid wire, join the stranded wire to the solid wire

in another box

•

Note that applying 220/240 VAC power to a system not

setup for that voltage level can severely damage its

electronic parts

•

Attach the supplied quick-connects to the wires as needed

Plug the quick-connects into the terminal block, as shown in the drawings above. Failure to

properly connect the ground wire can increase interference and cause unsafe operating

conditions

•

While the Master is fused internally to protect its electronics, you must also fuse the incoming

AC line as required by your local electrical code. You should connect the unit to a dedicated

10 Amp circuit. You may need to add external MOV’s or diodes to sync a specific clock type

– see Appendix D for the wiring diagram of your type clock. Appendix C shows wiring

diagrams for bell circuits and communications

•

Complete any mounting steps in the previous chapter before turning on the power supply

Turn the toggle switch in the power supply to the “ON” position. The display may show the

message SYSTEM RECOVERY IN PROGRESS" for about 2 minutes, then you will see the

date and time

•

Fasten the cover to the power supply

EXTERNAL PULSE-SYNC

Your Master can synchronize to other systems if needed. For example, you have a

non-compatible time clock that the Master cannot synchronize, but it has a built-in bell ringer.

By shorting terminals 7 & 8 on terminal block P1, or terminals 6 & 7 of the communications

terminal on the back of the display unit, the Master will immediately reset to 00:00 (midnight).

If you can program the other device to close its circuit at 00:00 (Midnight) then the two

systems will remain reasonably in sync. WARNING: DO NOT APPLY POWER TO THESE

CONNECTIONS – only close the circuit for a short time (Duration must be at least 1, but not

more than 2 seconds)

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LTRx-512 Installer’s Guide

Setting up the Master

If you will use the Master to sync clocks, you must first use relays #7 & #8 (terminal block

P1) for synching. If you have an LTR8-512 or LTR8-512M and will use a second clock

type, you must use relays #5 & #6 (terminal block P2) for those clocks

Bell

Zone #1 Zone #2 Zone #3 Zone #4 Zone #5 Zone #6 Zone #7 Zone #8

Relay #1 Relay #2 Relay #3 Relay #4 Relay #5 Relay #6 Relay #7 Relay #8

---Clock Sync #2--- ---Clock Sync #1---

Here are some suggested ways to program your Master’s relays:

1. Eight (8) bell zones that can last from 1 second to 99 seconds. Use this setup if your

Master will not synchronize secondary clocks.

2. Six (6) bell zones and one electro-mechanical wall clock sync control. Use this setup if

your Master will sync only one type of clock in one string.

3. Four (4) bell zones and two electro-mechanical wall clock sync controls. Use this setup if

you will synchronize two clock types, or if you have two strings of clocks (typically 20 to

35 clocks to a string).

The steps below lead you through getting the Master up and running.

Enter your Password

•

The user password allows you to access user functions, but you must use the administrator

password to access advanced functions. You can change the user password, but you cannot

change the administrator password. To keep the administrator functions secure, only give this

guide to authorized personnel. You can learn more about user passwords in the User’s Guide.

All factory programmed passwords can be spelled out using the letters of a telephone keypad.

For example, the administrator password is 332537 or DEALER.

Enter the administrator password ‘332537’ [DEALER]

Press

[#]

Display

SELECT FUNCTION CODE

[0]=ENTER PASSWORD

[0]

[#]

PASSWORD:

000000

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LTRx-512 Installer’s Guide

[3][3][2][5][3][7] PASSWORD: 332537

[#]

ADMINISTRATOR

PASSWORD ACCEPTED

Return to time and date display after 3 seconds

Note that if you stop using the keypad for over 5 minutes, you must re-enter your password

Set the Date and Time

•

Use Function [1] to set the date and time

Press

[#]

Display

SELECT FUNCTION CODE

SET DATE/TIME

[1]

[#]

ENT.DATE: MM-DD-YYYY

Enter the numbers for the month, date and year (4-digit year)

Press [#] to move to the second line

[0]..[8]

[#]

[1]..[7]

ENTER DAY-OF-WEEK: D

1=SUNDAY..7=SATURDAY

Enter a number [1] - [7] for the day of the week,

Sunday through Saturday

[#]

Press [#] to accept (or [*] to cancel and try again)

[0]..[8]

ENTER TIME: HH:MM

Enter the time of the next upcoming minute, using 12-hour or

24-hour format, then press [#]. (If using 24-hour format, enter

midnight as 00:00)

If you enter a time less than 13:00 (1:00 PM), you will see

[0] or [1]

[#]

SELECT [0]PM / [1]AM

PRESS [#] IF CORRECT

Press [#] at the top (‘00’ seconds) of the new minute to accept, or

press [*] to cancel and try again

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LTRx-512 Installer’s Guide

Enable the Relays

•

Use Function [6] to enable any control relays that you want to use

The Enable Circuits function only enables you to use certain relays. It does not turn them on.

Use Function [3] or [4] to actually turn on these relays

Press

[#]

Display

SELECT FUNCTION CODE

[6]=ENABLE CIRCUITS

[6]

[#]

SELECT ACTIVE

BELL ZONES 12345678

CLOCK CKTS

PRESS [#] IF CORRECT

[1]..[8]

Enter the circuit numbers that you want to turn

on or off. When you see the circuit numbers

you want on, press [#]

Choose the Clocks to Synchronize

•

If you will use the Master to synchronize electro-mechanical wall clocks (analog or digital),

then use Function [2] to choose the clock type for Clock #1 and/or Clock #2

NOTE: You do not need to enter any special setup to make the Master synchronize Lathem

time sync devices (DDC4R, LTR-0, DWA-S and OMC2) using the Master’s RS-485 SYNC

ports

Press

[#]

Display

SELECT FUNCTION CODE

[2]=SELECT CLOCK CTL

[2]

[#]

ENABLE CLOCK CIRCUIT

SELECT CLK1 CODE: NN

[#] FOR CODE LIST

To see the code list, keep pressing [#] and make

note of the code number for CLOCK1 and CLOCK2

[0]..[9]

Enter the 2-digit code for CLOCK1, then press [#]

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LTRx-512 Installer’s Guide

[#]

SYSTEM TYPE CODE: NN

If you are using an LTR8-512 or LTR8-512M and you chose a

CLOCK1 type other than 00, you will see

SELECT CLK2 CODE: NN

Enter the code for CLOCK2, or 00, if none

PRESS [#] IF CORRECT

[0]..[9]

[#]

Press [#] to accept

-or-

[*]

Press [*] to cancel and try again

Manual Bell Control

•

Use Function [3] to manually turn on bell circuits

Press

[#]

Display

SELECT FUNCTION CODE

[3]=MANUAL BELL CTRL

[3]

[#]

MANUAL BELL CONTROLS

1-2-3-4-5-6-7-8

PRESS AND HOLD [#]

TO EXECUTE.[*]TO END

[1]..[8]

Enter the circuit numbers that you want to test. When you see the

circuits you want, press and hold [#]. Those circuits will turn on

their relays, as shown by the green panel lights. When you release

the [#], the circuits will turn off their relays. You can now choose

and test other circuits or press [*] to quit

Note: Only circuits setup as Bell Zones will appear. If you have an

LTR8-512 with a single clock system attached, you will only see

circuits 1-6. If you have an LTR4-512 with a single clock system

attached, you will only see circuits 1-2

[*]

Return to time and date display

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LTRx-512 Installer’s Guide

Auto Test the Bells

Use the Auto Bell Test feature to turn on all bell relays once per minute at the start of each

minute. Once you start this function, you can test the continuity of your bell wiring circuits. Use

the “hidden code” 2355878 [BELLTST] to start the Auto Bell Test. When you enter this code,

ignore anything that displays on the screen

Use Function [6] to disable any relays that you do not want to use in your testing

Once you finish testing, make sure you enter the hidden code again to stop the Auto Bell Test and

use Function [6] to enable any relays that you earlier disabled

Set Daylight Savings

•

Your Master comes set to adjust for daylight savings in the United States. If you live outside

the United States or if your region does not observe daylight savings, use Function [7] to

change the country code

Press

[#]

Display

SELECT FUNCTION CODE

[7]

ENTER COUNTRY CODE

FOR DAYLIGHT SAVINGS

TIME ADJUSTMENT:

[0]..[9]

[#]

Enter your country code from Appendix C

Press [#] to accept (or [*] to cancel)

If your region does not observe daylight savings, then set your country code to 00

Setup Communications (LTR8-512 and LTR8-512M only)

•

Use Function [B] if you use the LTR MasterLink or Terminal Manager software with your

Master. You can setup your LTR8-512 with LTR MasterLink using RS-232 (serial), RS-485

(networked) or Modem (remote) Communications

You must enter these same settings for your LTR8-512 in the Terminal Manager or

LTR MasterLink software

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LTRx-512 Installer’s Guide

You cannot choose function [B] directly. To enter Communications, press [#][9][0][0][#]

Press

[#]

Display

SELECT FUNCTION CODE

Press [9], then

[9]

[0][0]

Press [0] twice to see

[B]=COMMUNICATIONS

[#]

COMMUNICATIONS SETUP

SELECT BAUD RATE:

[2]400 -OR- [9]600

[2] or [9]

Enter [2] for 2400 baud or [9] for 9600 baud (9600 is the default)

9600 (or 2400) BAUD SELECTED

ENTER TERM ID#

000

Note: If the LTR8-512M will be programmed to call the NIST

Atomic clock, you must select 9600 Baud.

[0]..[9]

[3]

Enter a unique Terminal ID # from 001-127 (065 is the default)

PRESS [#] TO CONFIRM

[#]

Press [#] to accept

-or-

[*]

Press [*] to cancel and try again

Congratulations! You have finished the basic setup of your LTRx-512 Master. All of the Master

functions are described in the next section of this guide, such as setting up your bell schedules.

For detailed information, please refer to the User’s Guide.

The Master will exit itself out of Program Mode once you stop using the keypad for 5 minutes or

if you wish to exit programming mode immediately to prevent others from accessing the Master

Clock, simply enter an invalid password. (For example)

[#]

[0]

[#] 99 [#]

SELECT FUNCTION CODE

[0]=ENTER PASSWORD

PASSWORD:

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Functions Defined

[#]

[*]

Starts the Programming Functions and Confirms Entries

Ends Program functions and/or Cancels Entries (except the “Quick Check”)

Quick Check Commands

Quick Check commands display system information for about 2 seconds. You can press any of the

three quick check keys ([*], [1] or [3]) when the Master is in Clock Mode.

Quick Check Command [*] Status

Any time you see the time and date, you can press [*] to see the Master status. You will see the

firmware version, terminal ID#, communications baud rate, time display format (12-hr or 24-hr),

daylight savings country code and the clock types you have chosen

Quick Check Command [1] Edit Keys

Any time you see the time and date, you can press [1] to see the edit key descriptions. You can

use the edit keys to program Bell Schedules, Automatic Schedule Change Dates, and Holiday

Dates. When you press [1], you will see

[1] EDIT

[3] PRV

[4] DEL

[6] ADD

[9] 1ST

[#] NXT

[*] EXIT

Quick Check Command [3] 12/24 Hour Display

Any time you see the time and date, you can press [3] after entering your password to toggle the

time and date between 12-hour and 24-hour format. The 12-hour format shows AM or PM, while

the 24-hour format shows the day of the week (or ‘HO’ for Holiday).

Program Keys

To access the Master’s programming functions, press the [#] key. As described below, some

functions require a user password, and advanced functions require the administrator password.

[0] = Password

You must enter a password for most programming functions. To enter your password, press

[#][0][#]

Enter your 6-digit password, then press [#]

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LTRx-512 Installer’s Guide

Once you enter your password, you can now program your Master until it detects that you

haven’t pressed a key for 5 minutes. After that, you must re-enter your password to keep

programming

The administrator password 332537 [DEALER] allows you to access advanced functions.

Functions that require the Administrator Password are [2] Select Clock Control, [6] Enable

Circuits, [7] Daylight Savings, and [B] Communications

The default user password is 000000. See Function [C] Change Password to learn how to

change your user password. You cannot change the administrator password

[1] = Set Date and Time

To set the date and time, enter your password, then [#][1][#]

[2] = Select Clock Control

This function requires the administrator password

Use this function to choose the clock makes and models that the Master will synchronize. To

start this function, enter your password, then press [#][2][#]

Appendix B lists the type codes. If you do not have the printed list handy, keep pressing [#] to

scroll through the list on the display. As you scroll, make note of the codes for both CLOCK1

and CLOCK2 (if needed). Enter the 2-digit code for CLOCK1, then press [#]

[3] = Manual Bell Control

This function does not require a password

Use this function to test bell circuits or to manually ring a bell. Press [#][3][#] to start this

function

You will know that your circuits have turned on when the green front panel lights for those

circuits light up

[4] = Program Schedules

Use this function to set bell schedules. Enter your password, then press [#][4][#] to start

programming schedules.

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[5] = Schedule Changes

Use Schedule Changes to run schedules at a certain date and time. This function works much

like the Bell Schedule Function [4]. Enter your password, then press [#][5][#]. You can

program up to 16 changes at a time

[6] = Enable or Disable Circuits

This function requires the administrator password

Use this function to Enable and Disable bell relays during circuit wiring or maintenance. This

function can also ‘hold back’ clocks to manually adjust for daylight savings in the fall if you

do not use the Daylight Savings function [7]

Disabled relays will ignore any schedules, and you cannot manually turn them on

([3]=MANUAL BELL CTRL). After you complete and check your system wiring, use this

function to enable those circuits, so that they will turn on when called. Enter your password,

then press [#][6][#]

[7] = Daylight Savings Time

This function requires the administrator password

Your LTRx-512 knows the daylight savings time (DST) settings for over 75 countries. By using

the 2-digit “country code”, your LTRx-512 will automatically adjust for daylight savings time. If

your nation does not appear in the Country Code list, you can choose code ‘00’ and use

Lathem’s LTR MasterLink software to program when clock adjustments should occur

Enter your password, then press [#][7][#]

Enter your country code from the list in Appendix C or press [9] to see the list. Press [9] to

jump to each letter in the alphabet, then press [#] to scroll through the codes. (example: press

[9] to jump to 08: BAHAMAS, BERMUDA, press [9] again to jump to 08: CANADA, press

[9] again to jump to 02: DENMARK and so on). When you see your country code, enter it,

then press [#]

If your region does not observe daylight savings, then leave the country code at 00

[8] = Change Schedule

Use this function to override any active bell schedules that you setup in function

[5]=SCHEDULE CHANGES. Or, you can use this function to instantly run a schedule that you

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LTRx-512 Installer’s Guide

setup in function [4]=PROGRAM SCHEDULE. Enter your password, then press [#][8][#] to

change a schedule

[9] = Sync Clocks

Use this function to quickly synchronize any secondary clocks. This function is primarily used

during initial installation or if power to your LTRx-512 stayed on while power to the secondary

clocks stopped.

Enter your password, then press [#][9][#]

[A] = Program Holidays

You can enter up to 16 dates as holidays in your LTRx-512. During holidays, only the events

that you set to occur on holidays will turn on when they reach the scheduled time

You cannot choose Function [A] directly. To start the Program Holidays function, enter your

password, then press [#][9][0][#]

[B] = Communications (LTR8-512 and LTR8-512M Only)

This function requires the administrator password

You cannot choose function [B] directly. To enter Communications, press [#][9][0][0][#]

You must enter these same settings for the Master in Lathem’s Terminal Manager or

LTR MasterLink software

[C] = Change Password

Use this function to change the default user password (000000) to a unique 6-digit number to

prevent unauthorized access to the LTRx-512’s programming functions. You should keep a

copy of this password in a safe place

You cannot choose function [C] directly. To start the Change Password function, enter

your current password, then press [#][9][0][0][0][#]

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[D] = Time Calibration (Available with Firmware Version 5.02)

The Crystal Oscillator that provides the Time Base for the Master Clock is optimized for

operation at 25’ C / 75’F, where it will exhibit its highest accuracy. Due to natural aging of the

crystal and to installation of the Master Clock in locations that do not maintain close temperature

control, the frequency of the Time-Base is apt to drift from its calibrated value, causing some

deterioration in timekeeping accuracy. Use this function to calibrate the oscillator to achieve

maximum timekeeping accuracy within your environment.

You cannot choose function [D] directly. To start the Time Calibration function, enter the

Administrator Password, then press [#][9][0][0][0][0][#].

The following screen will be presented:

CALIBRATE TIME-BASE

SELECT: 0 = NORMAL * Note: ‘*’ indicates initial mode

1 = FASTER

2 = SLOWER

To set the Oscillator to the factory default frequency, press [0]. The display will show:

TIME-BASE NORMAL

SELECT: 0 = NORMAL *

1 = FASTER

2 = SLOWER

If the Master Clock has been running ‘slow”, you can make the oscillator run faster by pressing

[1]. You may repeatedly press [1] to increase the adjustment. The display will show the following,

where ‘NN’ is the amount of positive adjustment applied: Each positive step represents a

correction of approx. 10.7 seconds / month. With a maximum adjustment of +31 steps, this

represents correction of up to +5.5 minutes / month.

TIME-BASE FASTER +NN

SELECT: 0 = NORMAL *

1 = FASTER

2 = SLOWER

If the Master Clock has been running ‘fast”, you can make the oscillator run slower by pressing

[2]. You may repeatedly press [2] to increase the adjustment. The display will show the following,

where ‘NN’ is the amount of negative adjustment applied: Each negative step represents a

correction of approx. -5.35 seconds / month. With a maximum adjustment of -31 steps, this

represents correction of up to -2.75 min. / month.

TIME-BASE SLOWER -NN

SELECT: 0 = NORMAL *

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1 = FASTER

2 = SLOWER

To exit the Time-Base Calibration procedure, press either [#] or [*].

EXAMPLE: During installation, set the Master Clock’s time to match an accurate reference

(Cell Phone display, Computer Network Time, WWVB Radio Clock, etc.). At the end of

one month, compare the Master’s time against the Reference Time, to determine accuracy.

If the Master were, say, 32 seconds slow, then calculate required positive correction as 32

/ 10.7 = 2.99 ~ 3. Set the correction to “FASTER + 03”.

Auto Bell Test

No password is required for this function

Use the Auto Bell Test feature to turn on all bell relays once per minute at the start of each

minute. Once you start this function, you can test the continuity of your bell wiring circuits. Use

the “hidden code” 2355878 [BELLTST] to start the Auto Bell Test. While entering this code,

ignore anything that displays on the screen

Use Function [6] to disable any relays that you do not want to use in your testing

Once you finish testing, make sure you re-enter the hidden code to stop the Auto Bell Test and

use Function [6] to enable any relays that you earlier disabled

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LTRx-512 Installer’s Guide

Daylight Savings Codes

APPENDIX A - SPECIFICATIONS

ELECTRICAL:

Input Voltage

120 or 220 / 240 VAC @ 60Hz or 50Hz

Input Power

50 VA max (less than 0.5A @ 120V)

10 year (nom.) Lithium Battery

120VAC / 28VDC, 10A , Pluggable

1 x 1.0 Amp Main (AGC1)

Memory / Quartz Time Backup

Bell / Clock Control Relays

Fuse

MECHANICAL / ENVIRONMENTAL:

Operating Temperature

Weight

32°-175° F (0°-80° C)

About 12 lb. (depending on configuration)

See configuration drawings

Dimensions

Mounting Options

Semi-Flush, Surface, 19" Rack, Hidden Power

Supply (some configurations optional)

FUNCTIONAL:

Secondary Clocks Supported

Any two (2) of twenty-four (24) types plus Lathem

DDC4R synchronization built-in; See Appendix B.

One (1) of twenty-four (24) types plus Lathem

DDC4R synchronization built-in; on the LTR4-512

Bell Zones and Schedules

Daylight Savings Time

Up to eight (8) zones [less two (2) for each electro-

mechanical secondary clock type]. {Up to four (4)

zones on the LTR4-512.}

Eight (8) Schedules, each allowing sixty-four (64)

multi-function events.

Supports DST standards for over 75 countries. See

Appendix C.

COMMUNICATIONS: (LTR8-512 and LTR8-512M)

Remote Communications with

RS-232 point-to-point @ 2400/9600 Baud

Lathem LTR MasterLink, Terminal RS-485 multi-drop network

Manager and “Atomic Clock”

Internal modem (option) dial-in / dial-out

Clock / Master Synchronization

using DDC4R Protocols

or Midnight Impulse

RS-485 Sync-In/Out Port @ 9600 Baud

RS-485 Sync-Out Port @ 9600 Baud

Dry-contact input

REGULATORY:

Certifications / Registrations

FCC Part15-ClassB, UL, cUL, CE

FCC Part 68 / Canada ICES-003 - Class B

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LTRx-512 Installer’s Guide

Daylight Savings Codes

APPENDIX B – DAYLIGHT SAVINGS COUNTRY CODES

ALBANIA

ANDORRA

ARMENIA

AUSTRIA

AZERBJAN

AZORES

BAHAMAS

BALEARIC ISLANDS

BELARUS

ENGLAND

ESTONIA

FALKLAND ISLANDS 10

FINLAND

FRANCE

GERMANY

GIBRALTER

GREECE

GREENLAND

HAITI

HUNGARY

IRAN

IRAQ

IRELAND

ISRAEL

ITALY

JAMAICA

JORDAN

KAZAKHSTAN

KURGYZSTAN

LATVIA

LEBANON

LIECHTENSTEIN

LUXUMBOURG

MALTA

MONACO

NETHERLANDS

NEW ZEALAND

NORWAY

POLAND

PORTUGAL

ROMANIA

RUSSIA

BELGIUM

SAN MARINO

SCOTLAND

SLOVAKIA

SLOVENIA

SPAIN

SWEDEN

SWITZERLAND

SYRIA

TURKEY

UKRAINE

UNITED KINGDOM

UNITED STATES

VATICAN CITY

YUGOSLAVIA FED.

BERMUDA

BOSNIA/HERCGVENA

BRAZIL

BULGARIA

CANADA

CHANNEL ISLANDS

CHILE

CROATIA

CUBA

CYPRUS

CZECH REP

DENMARK

EASTER ISLAND

EGYPT

USER-SPEC. DATES

UNDEFINED

01 Last Sunday in March, 3rd Sunday in October

02 Last Sunday in March, last Sunday in September

03 First day of April, Last day of September

04 First Friday in April, First Sunday in September

05 First Friday in April, third Friday in September

06 First Sunday in April, First Saturday in October

07 First Sunday in April, Last Sunday in October

08 Second Sunday in March, First Sunday in November

09 First day of May, Last day of September

10 Second Sunday in September, Third Sunday of March

11 First Sunday of October, Third Sunday of March

12 Second Sunday of October, Second Saturday of February

13 Third Sunday of October, Second Sunday of February

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LTRx-512 Installer’s Guide

Secondary Clock Types

APPENDIX C - SECONDARY CLOCK TYPE CODES

Type Description

Page

Type Description

Page

01 SYNCHRONOUS WIRED 26

05 3W MIN IMPULSE/58

01 LATHEM TYPE SS

01 CINCINNATI D10

01 IBM 77 SERIES

01 SIMPLEX 77 SER

01 SIMPLEX 93-9

01 SIMPLEX 91-9

01 SIMPLEX 941-9

01 SIMPLEX 943-9

01 SIMPLEX 6310-9231

06 SYNCHRONOUS WIRED 29

06 CINCINNATI D8

06 FARADAY

06 HONEYWELL ST402A

07 DUKANE 24F200 DIG

07 DUKANE 24F750

08 RAULAND 2410 DIG

09 SIMPLEX 2 MTR /59

10 SIMPLEX 2 MTR /45

01 STANDARD EL D10,D12 26

11 EDWARDS DUAL MOTR 31

01 STROMBERG 3000

02 3W MIN IMPULSE/59

02 LATHEM ISC 2W/3W

02 CINCINNATI D2-D4

02 DUKANE 24 SERIES

02 EDWARDS IMPULSE

02 FARADAY IMPULSE

02 IBM 75 SERIES

12 CINCINNATI D6

14 ELECTRONIC CODED

15 STRAIGHT FREQ.

16 IMPLS 12HR COR/59

17 STANDARD TM AR2/3

18 NATNL SYNC WIRED

18 DUKANE 240 SERIES

19 STMBRG SYN WIR/56

19 LATHEM SS MODIF.

20 3W MIN IMPULSE/44

21 CINCINNATI D1

02 SIMPLEX 74 SER

02 SIMPLEX 91-4

02 SIMPLEX 93-4

02 SIMPLEX 941-4

22 DUKANE SYNC WIRED

23 CONDOR 2412 DIG

23 RAULAND 2422 DIG

23 CONDOR BAR-AC-4412

24 EDWARDS SYNC E-1

25 SPECIAL TEST

02 SIMPLEX 943-4

02 SIMPLEX 6310-9075

02 STANDARD IMPULSE

02 STROMBERG IMPULS

03 STANDARD EL SYNCH

03 AMR T&S X55BHGA801 27

04 STANDARD TM AR-2A 28

27 SIMPLEX 2310 DUAL MT 30

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LTRx-512 Installer’s Guide

Wiring Diagrams

WIRING SECONDARY CLOCKS

TYPE 01 -

SYNCHRONOUS WIRED

TYPES INCLUDE: Lathem

Type SS Wall Clocks

Cincinnati

IBM

D10 (115VAC), D12 (24VAC)

77 Series

Simplex

Stromberg

77 Series, 93-9, 91-9, 941-9, 943-9, 6310-9231

3000

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

THREE WIRE MINUTE IMPULSE (59^THMIN.)

TYPE 02 -

TYPES INCLUDE: Lathem

Type ISC (3-Wire)

Cincinnati

Edwards

Faraday

IBM

D2, D4

Impulse

75 Series

Simplex

Standard

Stromberg

74 Series, 91-4, 93-4, 941-4, 943-4, 6310-9075, 6310-9231

Impulse

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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LTRx-512 Installer’s Guide

Wiring Diagrams

TYPE 02 -

TWO WIRE REVERSE POLARITY MINUTE IMPULSE (59^THMIN.)

TYPES INCLUDE: Lathem

Cincinnati

Type ISC (2-Wire)

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 03 -

STANDARD ELECTRIC SYNCHRONOUS (*Old Style: Dual Motor)

AMERICAN TIME & SIGNAL #X55BHGA801

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

Note: For New Style (Motor+Solenoid), see Type 06 (Faraday)

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Wiring Diagrams

STANDARD ELECTRIC TIME AR-2A TWO WIRE DUAL VOLTAGE

TYPE 04 -

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 05 -

THREE WIRE MINUTE IMPULSE (58^THMIN.)

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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SYNCHRONOUS WIRED

Wiring Diagrams

TYPE 06 -

TYPES INCLUDE: Cincinnati

Faraday

(New Style: Motor + Solenoid)

ST402A

Honeywell

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 07 -

DUKANE 24F200 DIGITAL CLOCKS

NOTE: THIS SELECTION IS NOT SUPPORTED ON THE LATHEM LTR8-512 OR

LTR4-512 SERIES. CORRECTION FOR DUKANE 24F200 DIGITAL CLOCKS IS

AVAILABLE ON THE DUKANE 24A715 SERIES MASTER CONTROL WITH SOLID-

STATE RELAYS. CONTACT DUKANE CORPORATION OR YOUR DUKANE

VENDOR.

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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Wiring Diagrams

TYPE 08 -

RAULAND 2410 DIGITAL CLOCKS (24VAC and 115VAC)

115VAC TYPE

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

24VAC TYPE

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 09 -

SIMPLEX 59^THMINUTE DUAL MOTOR

SIMPLEX 45^THMINUTE DUAL MOTOR

TYPE 10 -

TYPE 27 -

SIMPLEX 2310 DUAL MOTOR

Same hourly corrections as Type 09, but with addition of 12-hour corrections, as for

Type 03.

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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EDWARDS DUAL MOTOR

Wiring Diagrams

TYPE 11 -

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 12 -

CINCINNATI ‘D6’ CLOCKS

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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ELECTRONIC CODED CLOCKS

Wiring Diagrams

TYPE 14

Clocks run normally with 120 VAC power. For any bells or clock correction, the generator prestart

relay (SK1) first turns on for the signal-generator to reach frequency. SK1 turns on at the 00 second

after a programmed time or manual bell time. Then relay SK2 turns on for 3 seconds, from the 10^thto

the 13^thsecond, to apply the generator signal (coded cup start signal) onto the 120 VAC. Bell circuits

then turn on for 3 seconds, in the order listed below, applying the generator signal onto the 120 VAC

for decoding by the coded cups. The bell relay contacts must connect in parallel with the normally open

contacts of relay SK2. If it is not time for a clock correction signal, then SK1 turns off at the 59^th

second. At the 57^thminute of each hour, SK2 turns on from 57:54 to 58:02, applying the 8-second

hourly correction generator signal onto the 120 VAC. At 5:57 AM and 5:57 PM (12-hr correction),

SK2 turns on from 5:57:54 to 5:57:08, applying a 14-second 12-hour correction generator signal onto

the 120 VAC. For daylight savings, the clocks advance to the proper time by normal 12-hour

correction, not at 2:00 AM. The order of each relay operation is listed below (see NOTE for Type 15

re: SK1):

RELAY

FROM

SK1 Gen. Prestart (hourly corr.)

SK2 Start Signal (hourly corr.)

H:57:00

H:57:10 H:57:13

H:59:00

H:57:54 H:58:02

SK1 Gen. Prestart (12-hour corr.) H:57:00

H:59:00

SK2 Start Signal (12 hour corr.)

5:57:10 5:57:13

5:57:54 5:58:08

SK1 Gen. Prestart (bells)

SK2 Start Signal (bells)

H:MM:00 H:MM:59

H:MM:10 H:MM:13

Bell Circuit 6

Bell Circuit 5

Bell Circuit 4

Bell Circuit 3

Bell Circuit 2

Bell Circuit 1

H:MM:20 H:MM:23

H:MM:25 H:MM:28

H:MM:30 H:MM:33

H:MM:35 H:MM:38

H:MM:40 H:MM:43

H:MM:45 H:MM:48

Bells should not be scheduled for:

HH:58:SS

For Masters including firmware versions

prior to V2.17 only:

NOTE: The LTRx-512 was designed for

clocks that do not require a generator pre-

start to set the frequency level. Clocks

using this pre-start may not work with the

LTRx-512 older than V2.17

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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STRAIGHT FREQUENCY

Wiring Diagrams

TYPE 15 -

Clock correction and bell circuit operations are generated by sequentially applying various frequencies

onto the 120 VAC. Each bell and clock correction circuit has its own frequency. Each bell and clock

correction circuit has a receiver circuit that applies the associated bell or clock frequency (3510 Hz

normally used for clock signals). For daylight savings, the clocks advance to the proper time by normal

12-hour correction, not at 2:00 AM. The time sequence of applying the frequencies to the 120 VAC is

shown below, and the Master’s bell and system relays control these frequencies:

RELAY

FROM

Bell Ckt. 1

Bell Ckt. 2

Bell Ckt. 3

Bell Ckt. 4

Bell Ckt. 5

Bell Ckt. 6

H:MM:00

H:MM:05

H:MM:10

H:MM:15

H:MM:20

H:MM:25

H:MM:05

H:MM:10

H:MM:15

H:MM:20

H:MM:25

H:MM:30

Bells should not be

scheduled for:

HH:58:SS

00:00:SS

SK2

SK1

(Hourly Correction)

(12-Hour Correction) 5:57:54

H:57:54

H:58:02

5:58:08

(Hourly Correction &

12-HourCorrection)

(Bells)

H:57:00

H:59:00

30 sec of

Bell time

35 sec of min

previous to

Bell

NOTE:Bells must be programmed 1 minute ahead of desired time.

Bells will not work during manual clock corrections and at the 58^thminute.

For Masters including firmware

versions prior to V2.17 only:

NOTE: The LTRx-512 was designed

to work with clocks that do not

require a generator pre-start to set the

frequency level. Clocks using this pre-

start may not work with the LTRx-

512 firmware older than V2.17.

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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Wiring Diagrams

TYPE 16 -

THREE WIRE MINUTE IMPULSE (59 MIN)

WITH 12-HOUR CORRECTION

TYPES INCLUDE: Simplex

91 and 941

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 16 -

TWO WIRE REVERSE POLARITY MINUTE IMPULSE (59 MIN)

WITH 12-HOUR CORRECTION

24 V

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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LTRx-512 Installer’s Guide

Wiring Diagrams

TYPE 17 -

STANDARD ELECTRIC TIME AR-2 TWO WIRE DUAL VOLTAGE

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 17 -

STANDARD ELECTRIC TIME AR-3 THREE-WIRE IMPULSE

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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NATIONAL SYNCHRONOUS WIRED

Wiring Diagrams

TYPE 18 -

TYPES INCLUDE: Dukane

Rauland

240 Series

2463 Series

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 19 - STROMBERG SYNCHRONOUS WIRED

TYPES INCLUDE: Stromberg

Lathem

Synchronous

Type SS Wall Clocks (modified)

NOTE: Lathem type SS wall clocks can run according to the above signal operation if modified to

reference the minute and second hands to HH:57:16 (versus HH:59:00) and the hour hand to

12 o'clock versus 6 o'clock.

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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Wiring Diagrams

TYPE 20 -

THREE WIRE MINUTE IMPULSE (44^THMIN.)

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 21 -

CINCINNATI ‘D1’

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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DUKANE SYNCHRONOUS WIRED

Wiring Diagrams

TYPE 22 -

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

TYPE 23 - CONDOR DIGITAL CLOCKS (Model 2412)

TYPES INCLUDE: Condor

2412

If the digital clocks lose sync with the LTRx-512, then you can use function [9]=SYNC CLOCKS to re-

sync them.

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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LTRx-512 Installer’s Guide

Wiring Diagrams

TYPE 23 -

CONDOR DIGITAL CLOCKS (Model 2422)

TYPES INCLUDE: Rauland 2422

If the digital clocks lose sync with the LTRx-512, then you can use function [9]=SYNC CLOCKS to re-

sync them.

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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LTRx-512 Installer’s Guide

Wiring Diagrams

TYPE 23 -

CONDOR DIGITAL CLOCKS (BAR-AC-4412)

If the digital clocks lose sync with the LTRx-512, then you can use function [9]=SYNC CLOCKS to re-

sync them.

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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Wiring Diagrams

TYPE 24 -

EDWARDS SYNCHRONOUS WIRED CLOCKS - TYPE E1

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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LTRx-512 Installer’s Guide

Wiring Diagrams

APPENDIX D - WIRING DIAGRAMS

Fig. D1 - TERMINAL BLOCK ‘P4’

WIRING THE LTRx-512 FOR 120VAC (nom.) OPERATION

120 VAC

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

WIRING THE LTRx-512 FOR 220/240VAC (nom.) OPERATION

220/240 VAC

2 3 4 5 6 7 8

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

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LTRx-512 Installer’s Guide

Wiring Diagrams

Fig. D2 - TYPICAL SIGNAL DEVICE WIRING

All circuits should be fused or protected by a circuit breaker (10Amp maximum)

CKT 7A & 7B Operate Together. You may use

CKT 7A & 7B Operate Together. You

either of these circuits for bells. In LTR4, these

may use either of these circuits for bells.

circuits become CKT 3 and CKT 4.

Voltage IN

Zone 8

Zone 7A

Zone 7B

CKT 8

CKT 7A

CKT 7B

Zone 7A & 7B Operate Together

CKT 7A & 7B Operate Together

Voltage IN

CKT 5A & 5B Operate Tog ther. You

CKT 5A & 5B Operate Together. You may

may use either of these ci cuits for

use either of these circuits for bells. In

bells.

CKT 2.

LTR4, these circuits become CKT 1 and

Zone 6

CKT 6

Zone 5A

CKT 5A

Zone 5B

CKT 5B

Zone 5A & 5B Operate Together

CKT 5A & 5B Operate Together

Voltage IN

P3 is not included in the LTR4-512. Use CKT 5, 6, 7,

Zone 1 – 4 are not included in the LTR4-512.

& 8 for Bell Circuits.

Use Zones 5,6,7, & 8 for Bell Circuits.

Zone 1

Zone 2

Zone 3

Zone 4

CKT 4

CKT 3

CKT 2

CKT 1

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LTRx-512 Installer’s Guide

Wiring Diagrams

Fig. D3 - COMPUTER CABLE

(For Front Access Port)

(LTR8-512 and LTR8-512M Only)

Fig. D4 - RS-232 CABLE

(for permanent connection to the

Communications Terminal Block)

(LTR8-512 and LTR8-512M Only)

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LTRx-512 Installer’s Guide

Wiring Diagrams

Fig. D5 - SYNCHING UP TO 60 RS-485 TIME SYNC DEVICES

WITHOUT A BUFFER

RS-485

DSD

+ -

RS-485

DSD

+ -

RS-485

DSD

+ -

RS-485

DSD

+ -

RS-485

DSD

+ -

RS-485

DSD

+ -

10 11 12 13

Ports are located on the

back of the Display Unit

TxD

RxD

SYNC

OUT

RS-485

DATA SYNC

SYNC

12V~

MODEM

RS-232

RS-485

PULSE

SYNC

OUT

250ma

HOST COMMUNICATIONS

LTR8-512 & LTR8-512M Only

Notes: Up to 30 RS-485 Data Sync Devices (DSDs) can be connected to the Data Sync port. Since the SYNC IN

port can send as well as receive, 30 extra devices can be connected. If more than 60 DSDs are to be

connected, another Master Clock will have to be used as a “Booster”.

Fig. D6 - LTRx-512 USED AS SLAVE TO ALLOW 30 EXTRA RS-485

TIME SYNC DEVICES

RS-485

DSD

+ -

RS-485

DSD

+ -

MASTER

CLOCK

+ -

RS-485

DSD

+ -

RS-485

DSD

+ -

10 11 12 13

Ports are located on the

back of the Display Unit

TxD

RxD

SYNC

OUT

RS-485

DATA SYNC

SYNC

12V~

MODEM

RS-232

RS-485

PULSE

SYNC

OUT

HOST COMMUNICATIONS

LTR8-512 & LTR8-512M Only

250ma

Note: Since the Sync In port can send as well as receive, 30 extra devices can connect here. If you already have a

Master Source, such as an LTR-0, connect it and its string of clocks to the Sync In port, for a total of up to

60 devices.

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LTRx-512 Installer’s Guide

Wiring Diagrams

Fig. D7 – COMMUNICATION TERMINAL BLOCK

Rear of Display Unit

NOTES:

1. Twisted-pair (Cat-3/Cat-5) wire connects directly to Terminal Block; up to 2 wires per position

2. Pulse-sync input is same as provided in power supply. One (1) second (min.) dry-contact switch

closure across terminals causes Master to reset time to 12:00AM of nearest date

3. Grounds (GND) are “signal grounds”, not “chassis grounds”

4. Load on non-regulated 12VAC output must be less than 250mA

5. For DDC4R communications, the LTRx-512 automatically sets itself as a master or slave

Strain Relief for the Communications Cable

•

Using the two wire tie wraps included in the

installation kit, attach them to the terminal block

as shown in this sample to provide strain relief to

the communications cable. Use any two empty

positions.

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LTRx-512 Installer’s Guide

Wiring Diagrams

Use the six (6) connections as follows:

RS-485 Sync Time Device Connection

•

Sync In: Terminal block pair used to receive RS-485 synchronization from another Lathem Master

product or radio sync device, or transmit the LTRx-512’s own sync commands to up to 31 RS-485

devices, including Lathem Masters and DDC4R Wall Clocks

•

Sync Out: Terminal block pair used to buffer and repeat a received RS-485 sync signal, or transmit

the LTRx-512’s own synchronization commands to up to an additional 31 RS-485 devices

Note: When first powered on, the LTRx-512 will “listen” to the Sync-In line to determine if it

should be a “Master” or a “Slave”. If it does not receive a time update for 15 minutes, it will

assume it is a “Master” and start transmitting the time signal on the RS485 Synchronization line,

every minute. It will re-evaluate it’s Master/Slave status every day at 00:00 Hours. When setting up

the Master/Slave system, make sure that you power on the “Master” first and connect the other

LTRx-512 to the Sync-Out port on that clock.

Host Communications

•

RS-232: Three terminal block contacts for RS-232 communications with an IBM-compatible

computer running LTR MasterLink software for easy system setup

RS-485: Terminal block pair for RS-485 communications with an IBM-compatible computer

running LTR MasterLink software and SWIFT (RS485-RS232 converter)

Modem: Modular connector for modem use. You can use the optional internal modem to dial out to

the “Atomic Clock” at Ft. Collins, CO, or for a remote site using the LTR MasterLink and Terminal

Manager software

12 Volt AC Out

•

A non-regulated 12 Volt 250ma power source. Used with the LTR-RSS Remote Schedule Selector

when in close proximaty to the Master Clock. This circuit is not fused seperately and attaching

devices with a higher current load may damage the Master Clock.

Mounting the Master with Hidden Power Supply

•

Using the optional eight (8) foot Connection Cable, you can mount the Display Unit semi-flush on

the wall and place the Power Supply Box in the ceiling, floor or behind a wall. When attaching this

cable, remove the standard short cable and connect the 8 foot cable to the power supply board with

the cable moving away from the circuit board. Connect the other end to the back of the Display Unit

using the ribbon cable connector. The cable should lead towards the bottom of the Display Unit.

Attach the strain releif cable clamps at each end.

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LTRx-512 Installer’s Guide

Wiring Diagrams

Fig. D8 - POWER SUPPLY TERMINAL BLOCKS

NOTES:

1. Circuits CKT1...CKT4 designate bell controls. Circuit pairs CKT5/CKT6 and CKT7/CKT8 can

function as clock synchronization circuits or as bell controls

(Note: CKT1…CKT4 do not exist on the LTR4-512. Instead use CKT5…CKT8 which are indicated

related to the LEDs on the Display Unit numbered 1-4).

2. MOV’s (Metal-Oxide Varistors) protect all relay contacts

3. Voltage-select jumpers connect to terminal block P4 for 120VAC operation. Users who need to run

at 220/240VAC must remove the 120V jumpers and install one jumper wire for the 240V selection.

The system will automatically adjust for operation at 60Hz or 50Hz at either voltage

4. Some clock setups may require external diodes or MOV’s. See the wiring diagram for your type

clock

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LTRx-512 Installer’s Guide

Installing the Modem

APPENDIX E – INSTALL THE OPTIONAL MODEM

Installation of the optional internal modem should be performed by a trained and competent

electronics technician. Follow these steps;

1. Turn off the power to the Master Clock. You can either access the on/off switch inside the

Power Supply Box or turn off the power at the source.

2. Remove the four (4) screws from the sides of the Display Unit.

3. Gently remove the cover of the Display Unit. Some adhesive me hold the cover to the display

and keypad. A gentle pull should have the cover pull free.

4. Locate the large rectangular hole in the circuit board just to the right of the display.

5. Carefully insert the modem into the sockets on each side of the opening. The modem goes in

with the transformer on the modem board at the top of the board.

6. Replace the cover and secure it with the four (4) screws.

7. Connect a working ANALOG telephone line to the telephone jack on the back of the display

unit.

8. Replace the Master Clock to its original position and restore power.

9. Setup the Communications on the Master Clock. Press [#][9][0][0][#] and ensure that the baud

rate is at 9600 and verify the ID# of this Master Clock.

10. Setup your LTR MasterLink software to communicate with a modem clock and test the

connection.

MODEM

Installed

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LTRx-512 Installer’s Guide

Connecting the LTR-RSS

APPENDIX F – Connecting the LTR-RSS Remote Schedule Selector

The “Remote Schedule Selector” is an accessory for the LTR8-512 Master Controller and allows an

Operator to select one (1) of the eight (8) possible schedules stored in the Master Controller [or No

Schedule] for immediate activation. The selection made will remain in effect until either an alternate

selection is made (at the Master’s KeyPad, via MasterLink Software or through the Remote Schedule

Selector) or a Programmed Schedule Change occurs.

The Assembly of the Remote Schedule Selector consists of an Electronic Circuit suspended beneath a

cover plate for a double-gang switch-type electrical box (not supplied with the product). The Circuit

includes a low-power MicroProcessor, a method of selecting the ‘Address’ of the Master to be remotely

controlled, and a 4-screw Terminal Block for Installer Interconnect. Two screws of the Terminal Block

are for attachment of the Twisted-Pair (Cat-3 typical) low-voltage Network Communications Cable to

the Master’s RS-485 Port. The other two screws are to be used for supplying 9-24V AC/DC as

continuous power source to the unit.

On the face of the the cover plate are a 10-position Rotary Switch (to select the Schedule to be made

‘Active’), a Push Button to send the Command to the Master, and an array of lighting Status Indicators

by which the Operator can receive confirmation from the Master that the Change Schedule Command

has been accepted and acted upon.

MASTER CONTROL REMOTE SCHEDULE

COVER PLATE FOR DOUBLE-GANG

CIRCUIT BOARD

D-

D+

64 32 16

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LTRx-512 Installer’s Guide

Connecting the LTR-RSS

INSTALLATION

To install the Remote Schedule Selector,

• Remove the RSS from it’s package and locate the four (4) conductor connector (upper left) and the

dip switch (bottom center) on the back of the circuit board.

• Set the hidden Address Selector dip switch to match the Master’s Programmed Address (default =

Code 65) and the Master Clock’s baud rate. You accomplish this by sliding the dip switches

towards the legend on the circuit board.

The Baud Rate is selected with switch 1. Slide it towards the bottom of the board to select

9600 baud (default) and up to select 2400 baud.

To select the address, total up the

numbers below the switches to arrive

at the total which equals the addess

you wish and slide those switches

down. For example, the default

address is 065. Switch 2 (value of 64)

and switch 8 (value of 1) are down.

(64+1 = 65) For address 003, you

would slide switch 7 and switch 8

down (2+1=3). For address 102, you

would slide down switches 2, 3, 6 and

7. (64+32+4+2=102)

2400

9600

1 2 3 4 5 6 7 8

• Attach the Communication Cable wire-pair (with proper polarity). The upper

D+

contector is Data - and the next one down is Data + .

• Connect a low-voltage Power to the lower 2 terminals on the Terminal Block. The LTR-RSS

requires a voltage source of between 9 and 24 Volts, AC or DC. Note: It is recommended that you

use a power supply other than the power supplied from terminals 12 and 13 of the Communications

Terminals on the back of the Master Clock’s Display Unit. This provides 12 Volts AC at 250ma.

Wire runs of greater than 100 feet or placed in areas that may cause electrical interferances will

cause problems.We also recommend that you place an in-line 250ma fuse on this connection.

• Secure the cover-plate to the electrical box with four 6-32 FH screws.

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LTRx-512 Installer’s Guide

Connecting the LTR-RSS

INSTALLATION DETAIL

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LTRx-512 Installer’s Guide

Connecting the LTR-RSS

OPERATIONAL DESCRIPTION

To use the Remote Schedule Selector, the Operator will first select, via the Rotary Switch, which of the

Schedules is to be made active.

The ‘OFF’ position may be used to de-activate all schedules

Positions ‘1’ to ‘8’ may be used to select a single Schedule to be made ‘Active’

The ‘INQUIRE’ position may be used to determine which Schedules may be currently ‘Active’

without altering those schedules previously selected.

After setting the selected position of the Rotary Switch, the Operator should press the ‘ENTER

SELECTION’ Push-Button. This will transmit the appropriate Command to the Master. It will wait for

a reply from the Master, display which Schedule(s) are now Active on the Lighting Indicators (LEDs)

as confirmation to the Operator that the Command has been accepted and executed by the Master. The

lit Indicators will remain active for a period of five (5) seconds, after which the unit will go back to

‘sleep mode’, to conserve power.

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LTRx-512 Installer’s Guide

Connecting the LTR-GPS Satellite Receiver/Synchronizer

APPENDIX G – Connecting the LTR-GPS Satellite Receiver /

Synchronizer

Lathem’s LTR-GPS is a Global Positioning Satellite receiver using 12-channels to access the accurate

date and time signal transmitted each second by 24 satellites in geosynchronous orbit around the globe.

The package includes an amplified GPS Antenna, which must be mounted out-doors or beneath a roof

sky-light, facing skyward. An integrated cable links the Antenna to the LTR-GPS Receiver Module,

which should be mounted in-doors.

The Receiver Module verifies and reformats the received satellite data, and offers multiple

synchronization protocol outputs, including a capability to synchronize LTRx-512 Master Clocks to this

highly accurate “Atomic” reference.

Simple DIP-Switch set-up enables the installer to specify Local Time Zone, Daylight Savings Time

corrections, and output formats. An LED indicator shows Signal Reception / Protocol Mode.

Unshielded Twisted-Pair (UTP) Cable (Cat-3 or Cat-5) is suitable to connect the D+/D- Data Output

Terminals of the LTR-GPS to the D+/D- “Sync-In” Terminals on the back of the Master Clock’s Front

Panel Assembly.

The LTR-GPS may receive its power from an LTRx-512-series Master Clock, using a 2^ndcable pair (as

illustrated below), if the distance is less than 200ft; else, power is provided locally by a 9vAC Power

Adapter.

4000 FT. MAX

200 FT. MAX;

ELSE USE POWER ADAPTER

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LTRx-512 Installer’s Guide

Power Supply Schematics

APPENDIX H – POWER SUPPLY SCHEMATICS

LTR8-512 / LTR8-512M

LTR4-512

VMM7086 REV. D

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LTRx-512 Installer’s Guide

Power Supply Schematics

FOR UNITS EQUIPPED WITH AN INTERNAL MODEM

NOTICE: This equipment complies with Part 68 of the FCC Rules. On the mounting panel of this equipment is a label that contains, among other

information, the FCC Registration Number and Ringer Equivalence Number (REN) for this equipment. If requested, provide this information to your

Telephone Company.

The registration jack USOC for this equipment is (RJ-11). An FCC compliant telephone cord and modular plug is provided with this equipment. This

equipment is designed to connect to the telephone network or premises wiring using a compatible modular jack, which is Part 68 compliant. See installation

instructions for details.

The REN is useful to determine the quantity of devices that may be connected to the telephone line. Excessive RENs on the telephone line may result in the

devices not ringing in response to an incoming call. In most, but not all areas, the sum of “REN” of all devices should not exceed five (5). To be certain of the

number of devices that may be connected to a line, as determined by the total “REN”, contact the local Telephone Company.

If your telephone equipment (Modem) causes harm to the telephone network, the Telephone Company will notify you in advance that temporary discontinuance

of service may be required, but if advance notice isn’t practical, you will be notified as soon as possible. You will be advised of your right to file a complaint

with the FCC if you believe it is necessary.

Your Telephone Company may make changes in its facilities, equipment, operations or procedures that could affect the operation of your equipment. If they do,

you will be given advance notice so as to give you an opportunity to maintain uninterrupted service.

If you experience trouble with this equipment (Modem), please contact Lathem Time Customer Service at (800) 241-4990 for repair/warranty information. If

your equipment is causing harm to the telephone network, the Telephone Company may request that you disconnect the equipment until the problem is

resolved.

A Lathem-Authorized Service Center will replace a defective Lathem Modem product.

This equipment may not be used on public coin service provided by the Telephone Company. Connection to party lines is subject to state tariffs. (Contact your

state public utility commission or corporation commission for information.)

NOTICE: The Industry Canada label identifies certified equipment. This certification means that the equipment meets certain telecommunications

network protective, operational and safety requirements. The Industry Canada does not guarantee the equipment will operate to the user’s

satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local Telecommunications Company. This

equipment must also be installed using an acceptable method of connection. In some cases, the company’s inside wiring associated with a single line individual

service may be extended by means of a certified connector assembly (telephone extension cord). The customer should be aware that compliance with the above

conditions may not prevent degradation of service in some situations.

Any equipment repairs made by the user, or equipment malfunctions, may give the Telecommunications Company cause to request the user to disconnect the

equipment.

Users should ensure, for their own protection, that the electrical ground connections of the power utility, telephone lines and internal metallic water pipe system,

if present, are connected together. This precaution may be particularly important in rural areas.

Caution: Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as

appropriate.

NOTE: The Ringer Equivalence Number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be

connected to a telephone interface. The termination of an interface may consist of any combination of devices subject only to the requirement that the sum of the

Ringer Equivalence Numbers of all the devices does not exceed 5.

A NOTE ABOUT THE LITHIUM BATTERY

This product's lithium battery contains Perchlorate Material - special handling may apply. Please go to web site

www.dtsc.ca.gov/hazardouswaste/perchlorate for information about proper methods of disposal in California.

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LTRx-512 Installer’s Guide

Power Supply Schematics

Limited One-Year Limited Warranty

Lathem warrants the hardware products described in this guide against defects in material and workmanship for a

period of one year from date of original purchase from Lathem or from an authorized Lathem reseller. The

conditions of this warranty and the extent of the responsibility of Lathem Time Corporation (“Lathem”) under this

warranty are listed below.

1. This warranty will become void when service performed by anyone other than an approved Lathem

warranty service dealer results in damage to the product.

2. This warranty does not apply to any product which has been subject to abuse, neglect, or accident, or which

has had the serial number altered or removed, or which has been connected, installed, adjusted, or repaired

other than in accordance with instructions furnished by Lathem.

3. This warranty does not cover dealer labor cost for removing and reinstalling the machine for repair, or any

expendable parts that are readily replaced due to normal use.

4. The sole responsibility of Lathem under this warranty shall be limited to repair of this product, or

replacement thereof, at the sole discretion of Lathem.

5. If it becomes necessary to send the product or any defective part to Lathem or any authorized service

dealer, the product must be shipped in its original carton or equivalent, fully insured with shipping charges

prepaid. Lathem will not assume any responsibility for any loss or damage incurred in shipping.

6. WARRANTY DISCLAIMER AND LIMITATION OF LIABILITY: Except only the limited express

warranty set forth above, the products are sold with no expressed or implied warranties of any kind, and the

implied warranties of merchantability and fitness for a particular purpose are hereby expressly disclaimed.

No warranties are given with respect to products purchased other than from Lathem or an authorized

Lathem reseller and any such products are purchased "as is, with all faults." In no event will Lathem be

liable for any direct, indirect, special, incidental or consequential damages arising out of or in connection

with the delivery, use or inability to use, or performance of this product. In the event any limited remedy

given herein shall be deemed to have failed of its essential purpose, Lathem's maximum liability shall be to

refund the purchase price upon return of the product.

7. Proof of date of purchase from Lathem or an authorized Lathem reseller is required for warranty service on

this product.

8. This Warranty grants specific legal rights. Additional legal rights, which may vary by locale, may also

apply.

9. Should any difficulties arise with the performance of this product during warranty, or with any Lathem

authorized service centers, contact Lathem Time at the address below.

Lathem Time

200 Selig Drive, SW, Atlanta, GA 30336

404-691-0405

www.lathem.com

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LTRx-512 Installer’s Guide

Power Supply Schematics

Administrator password...................... 11, 17, 18, 19, 20

Auto Bell Test ......................................................15, 22

Baud Rate.............................................................16, 17

Bell schedules...................................................1, 18, 19

Bell zones...................................................................11

Hidden codes ........................................................15, 22

Hidden power supply..............................................7, 47

Holiday schedules.............................................1, 17, 20

Lights...................................................................14, 18

LTR MasterLink software................. 1, 2, 15, 19, 20, 47

Cable connection ..........................................................2

Change Password .................................................18, 20

Change Schedule........................................................19

Clock sync control ......................................................11

Clock type codes.........................................................18

Clock types.............................................................1, 18

Communications........................1, 15, 16, 18, 20, 23, 47

Communications function...........................................20

Country code ..................................................15, 17, 19

Daylight savings......................................... 1, 15, 17, 19

Disable circuits.....................................................13, 19

Enable circuits................................................13, 18, 19

Function [0] – Password .......................................11, 17

Function [1] – Set Date and Time.........................12, 18

Function [2] – Select Clock Control......................13, 18

Function [3] – Manual Bell Control......................14, 18

Function [4] – Program Schedule................................18

Function [5] – Schedule Change.................................19

Function [6] – Enable/Disable Circuits .................13, 19

Function [7] – Daylight Savings Time ..................15, 19

Function [8] – Change Schedule.................................19

Function [9] – Sync Clocks.........................................20

Function [A] – Program Holidays ...............................20

Function [B] – Communications...........................15, 20

Function [C] – Change Password................................20

Manual bell control...................................................... 1

Passwords...................................................1, 11, 17, 20

Program Holidays function .........................................20

Program Keys.............................................................17

Quick Check Command [*] ........................................17

Quick Check Command [1] ........................................17

Quick Check Command [3] ........................................17

Quick-connects............................................................ 2

Rack mount ................................................................. 6

RS-485 network.........................1, 11, 13, 15, 23, 45, 47

Schedule Changes function.........................................19

Schedules .............................................................18, 19

Semi-flush mount ........................................................ 4

Set the date and time ..................................................18

Surface mount ............................................................. 3

Sync Clocks function ..................................................20

Syncing Clocks...............................................11, 13, 23

Terminal block ...........................................................47

Terminal ID#........................................................16, 17

Test circuits..........................................................14, 18

User password .......................................... 11, 17, 18, 20

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