USER
MANUA L
MODEL 1012AR
Asynchronous, Carrier
Controlled Short Range
Modem
Part# 07M1012AR-A
Doc# 040051UA
Revised 11/22/94
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
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3.0 CONFIGURATION
4.0 INSTALLATION
The Model 1012AR is pre-configured at the factory to work in mul-
tipoint applications, and in point-to-point applications that use hardware
flow control. These are the vast majority of applications that call for
the Model 1012AR. Therefore, you will normally have no need to re-
configure the Model 1012AR: it will be strictly “plug-and-play”.
The Model 1012AR features modular connectors on both the
EIA/TIA-561 and 4-wire (line) sides. The EIA/TIA-561 interface is
always a 10 pin RJ-45 jack (although its physical size is identical to an
8-pin RJ-45 jack). A one foot RJ-45 patch cable, wired straight
through, is supplied with the unit. The 4-wire interface may be a 6 pin
RJ-11 jack or an 8 pin RJ-45 jack.
The only user-modifiable setting on the Model 1012AR is the RTS
control strap. The RTS control strap setting determines how its trans-
mitter (i.e. carrier) is activated. When the RST control strap is ON
(installed on the pins), the transmitter is enabled by activating RTS
(RJ-45 pin 8). This is the factory setting.. When its strap is OFF
(removed from the pins), the 1012AR’s transmitter is constantly on. If
your application requires the transmitter to be constantly on (i.e. hard-
ware flow control disabled), follow the instructions below:
4.1 CONNECTION TO THE EIA/TIA-561 INTERFACE
The Model 1012AR features a convenient, 10 pin RJ-45 jack for
interface with your DTE device. This jack is wired as a DCE accord-
ing to the EIA/TIA-561 specification. Figure 2 (below) shows the
pins and signals for the modular EIA/TIA-561 interface. Note: Signal
are named from the perspective of the DTE (PC/terminal). Therefore,
even though pin 7 (below) is called “TD” , the signal is actually incom-
ing to the DCE (Model 1012AR).
Step 1: Opening the Case. To open the Model 1012AR’s case,
insert the blade of a small flat-head screw driver into the narrow slots
on either side of the case and twist. The two case halves should pop
apart. Then slide the case halves off of the two end inserts. This will
expose the PC board.
10 Pin RJ-45 (DCE)
SIGNAL
DIRECTION
1 ----------------------N/C
2 ----------------------RI
3 ----------------------CD
4 ----------------------DTR
5 ----------------------SG
6 ----------------------RD
7 ----------------------TD
8 ----------------------CTS
9 ----------------------RTS
10 ----------------------N/C
Not Supported
From 1012AR
To 1012AR
No Direction
From 1012AR
To 1012AR
Step 2: Setting the RTS Strap. On Figure 1 (below), you will
see the location of the RTS strap on the PC board. To re-configure the
Model 1012AR for transmitter constantly on, remove the strap by
pulling it out with a pair of needle-nose pliers or tweezers. Be sure not
to lose the strap.
From 1012AR
To 1012AR
Step 3: Closing the Case. To close the Model 1012AR’s case,
be sure the end inserts are in place around th modular jacks
(“side”side closest to the clip) and slide th case halves down around
them. Then snap the case halves shut.
.
Figure 2. Pin-outs for the Model 1012AR’s modular EIA/TIA-561 interface jack
If you wish to use the Model 1012AR with a DTE device that is
equipped with a DB-25 RS-232 port, you will need to construct a
patch cable according to the diagram shown in Figure 3 (below).
RTS/CTS
Strap
SIGNAL
10 Pin RJ-45 (DCE)
DB-25 (DTE)
SIGNAL
Isolation
Transformers
Surge
CD
DTR
SG
RD
TD
3 ------------------------------8
CD
DTR
SG
RD
TD
Suppressors
4 ------------------------------20
5 ------------------------------7
6 ------------------------------3
7 ------------------------------2
8 ------------------------------5
9 ------------------------------9
CTS
RTS
CTS
RTS
Figure 1. Model 1012AR board, showing the RTS strap location
Figure 3. Pin connections for an EIA/TIA-561(RJ-45) to RS-232 (DB-25) patch cable.
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4.2 CONNECTION TO THE 4-WIRE INTERFACE
4.3 MULTIPOINT CONNECTION
The Model 1012AR offers RJ-11 and RJ-45 options for connection
of the 4-wire data line. The signals/pins used are shown below:
The Model 1012AR supports multi-point applications using either
a star or a daisy chain topology. together in a master/slave arrange-
ment. Maximum distance between the units will vary based upon the
number of drops, data rate, wire gauge, etc. Call Technical Support for
specific distance estimates. In both topologies, the master unit should
be set to “transmitter constantly on” (strap removed), and the slaves
should be set to “transmitter controlled by RTS” (strap in place).
RJ-11
SIGNAL
RJ-45
SIGNAL
1 ------------GND†
1 -----------N/C
2 ------------RCV-
3 ------------XMT+
4 ------------XMT-
5 ------------RCV+
6 ------------GND
2 -----------GND
3 -----------RCV-
4 -----------XMT+
5 -----------XMT-
6 -----------RCV+
7 -----------GND
8 -----------N/C
4.3.1 STAR TOPOLOGY
Figure 4 (below) shows how to wire the two-pair cables properly
for a Model 1012AR star topology. Note that the ground connection is
not needed
†Connection to ground is optional
HOST
FIRST SLAVE
SECOND SLAVE
XMT+
RCV+
RCV+
1 - Blue
1 - Blue
2 - Orange
3 - Black
4 - Red
2 - Yellow
3 - Green
4 - Red
XMT-
RCV+
RCV-
RCV-
XMT+
XMT-
RCV-
XMT+
XMT-
5 - Green
6 - Yellow
7 - Brown
8 - Slate
5 - Black
6 - White
4.2.1 POINT-TO-POINT CONNECTION
Figure 4. Star wiring for Model 1012AR host and slaves
When installing two Model 1012AR units in a point-to-point appli-
cation, the cable between them should be a crossover cable, as shown
in the following chart. The color/pin number correlations below corre-
spond to AT&T’s wiring standard for RJ-11 connectors.
4.3.2 DAISY CHAIN TOPOLOGY
SIGNAL PIN#
COLOR
COLOR PIN#
SIGNAL
Figure 5 (below) shows how to wire the two-pair cables properly
for a Model 1012AR daisy-chain topology. Note that the ground con-
nection is not needed.
GND†
RCV-
XMT+
XMT-
RCV+
GND
1
2
3
4
5
6
Blue‡--------------White
Yellow------------Red
Green ------------Black
Red---------------Yellow
Black -------------Green
White-------------Blue
6
4
5
2
3
1
GND
XMT-
RCV+
RCV-
XMT+
GND
HOST
XMT+
XMT-
RCV+
RCV-
FIRST SLAVE
RCV+
OTHER SLAVE(S)
RCV+
RCV-
XMT+
XMT-
RCV-
XMT+
XMT-
†Connection to ground is optional
‡Standard color codes—yours may be different
Figure 5. Daisy chain wiring for Model 1012AR host and slaves
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APPENDIX A
APPENDIX B
PAT TON MODEL 1012AR SPECIFICATIONS
PAT TON MODEL 1012AR BLOCK DIAGRAM
Transmission Format:
Transmission Line:
Interface:
Asynchronous, full duplex
Two unconditioned twisted pair 19-26 AWG
EIA/TIA 561
Data Rates:
Isolation:
0 - 38.4 Kbps
Minimum 1500 V RMS via custom
transformers
Surge Protection:
Control Signals:
600W power dissipation at 1 mS and
response time of 1 pS
CTS follows RTS from the terminal (DTE);
DSR follows DTR from the terminal (DTE);
DCD indicates reception of carrier
Approximately 35 mS
10 Pin RJ-45 on EIA/TIA-561 side; RJ-11
or 8 pin RJ-45 on line side
No external power required; uses power
from EIA data and control signals
0-60°C (32-140°F)
RTS/CTS Delay:
Connectors:
Power Supply:
Temperature Range:
Altitude:
0-15,000 feet
Humidity:
Weight:
5 to 95% noncondensing
2 oz.
Dimensions:
2.66” x 2.10” x 0.73”
Distance Table (miles)
Wire Gauge
Data
Rate
19
24
26
38,400
19,200
9,600
4,800
2,400
1,200
6.0
6.0
6.0
6.0
6.0
6.0
4.0
4.0
4.0
4.0
4.0
4.0
2.5
2.5
2.5
2.5
2.5
2.5
Copyright ©
Patton Electronics Company
All Rights Reserved
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