RS-232
RS-485
INTERFACE CONVERTER
IC-485S
&
IC-485SI
User’s Manual
@Copyright 1994
Manual part NO.PAPE-0075-200
Printed in Taiwan 06/94
International CO., LTD.
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PACKAGE CHECKLIST
When you purchase this product, it should contain the
following elements:
x 1
x 1
l
l
l
IC-485S or IC-485SI Converter
Power Adapter (DC9V, 200mA)
IC-485S
&
IC-485SI User’s Manual x 1
Attention: To prevent electric shock caused by
lightening, you must provide a ground
path by connecting a wire from the
Grounding Tab to the earth ground
(for IC-485SI only).
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FUNCTION OVERVIEW
IC-485S/IC-485SI
1 FUNCTION OVERVIEW
TABLE OF CONTENTS
l-l INTRODUCTION
............
.......................
1
1
1 FUNCTION OVERVIEW
The IC-485S and IC-485SI are a series of a bi-di-
rectional interface converters for RS-232 and RS-
485. The IC-485SI has built-in isolators for high
voltage (2OOOV) protection. With the IC-485 series,
ic-485s & IC-485SI, it provides Point-to-Point,
Multidrop and Simplex operations. The IC-485s
provides an extra Monitoring function.
l-l Introduction
2
3
3
4
6
8
9
....................
l-2 Specifications.
...................
2 INSTALLATION
2- 1 Installation Procedure.
2-2 Switch Function Description
..............
.........
......................
....
3 OPERATION
The IC-485 can be powered from the following two
ways:
3-l Point-to-Paint/4-Wire Full Duplex
3-2 Point-to-Paint/2-Wire Half Duplex
....
1) a DC 9V, 2OOmA power adapter
2) the pin #9 of the RS-232 connecter
. . . . . . . 10
3-3 Multidrop/4-Wire Full Duplex.
3-4 Multidrop/2-Wire Half Duplex
3-5 Simplex/Transmit, Receive Only.
3-6 Monitoring (for IC-485s only)
......
....
.....
11
12
13
14
14
15
Two slide switches are used to configure its op-
eration mode, contention control, and assignment of
the RS-232. Following figure is the IC-485’s exter-
nal view.
. . . . . . . . . . . . . . . . . . . . . . . . . .
4 OTHERS
.........
4- 1 Terminal Block Definition.
........................
Ter m in a l Block
4-2 Self Test
APPENDIX A
16
17
18
....................
.........
....
TV Interference.
Trouble Shooting
RS-232 DCE/DTE Description
Preventing Radio
&
Figure l-l External View
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1
INSTALLATION
IC-485S/IC-485SI
INSTALLATION
IC-485S/IC-485SI
the RS-485 line signals (for IC-485S
only).
2-2 SWITCH F UNCTION DESCRIP TION
Refer to the location of the SW1 and SW2, please see
Figure 1- 1.
SW2: Transmitting and Receiving mode selection
Position 1: (TxON, RxON) means the IC-485 is
always in transmitting mode and in re-
ceiving mode.(using in Point-to-Point
mode)
IC-485S:
Position 2: (TxRTS, RxRTS) means the K-485 is in
transmitting mode while RTS signal is at
high level and it is in receiving mode
while RTS signal is at low level.(using
in Multidrop mode)
IC-485SI:
Position 3:
(TxRTS, RxON) means the IC-485 is
always in receiving mode and it is in
transmitting mode only while RTS sig-
nal is at high level.(using in Multidrop
mode to monitor the RS-485 line signals)
SW 1: Device Mode Selection
Position 1: DCE means the IC-485 is set at DCE
mode and it must be connected to a DTE
device.
Note:
DTE means Data Terminal Equipment.
Position 2: DTE means the IC-485 is set at DTE
mode and it must be connected to a DCE
device.
DCE means Data Communication
Equipment.
More detailed information, please refer
to the Appendix.
Position 3: Monitor means the IC-485S is set at
monitor mode and it is used to monitor
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User’s Manual
5
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OPERATION
OPERATION
IC-485S/IC-485SI
IC-485S/IC-485SI
Simplex configuration means that more than two
devices can be linked all together to communicate
through many IC-485 devices. Its configuration is
like the Multidrop’s, but the master device can talk
only a n d the slaver devices can listen only.
3 OPERATION
The IC-485S
&
IC-485SI supports 4 kinds of
functions in 6 kinds of configurations. They are
1. Point-to-Point
4. M o n i t o r Mode( Fig. 3-6
)
(for IC-485S only)
Point-to-Point configuration means two devices
which locate at two different places can be linked
together to communicate through a couple of IC-485
devices.
Monitor configuration means a IC-485s device
c a n be wir ed to the lines of RS-485 or RS-422 devices
to monitor the line signals. In this configuration the
IC-485S will change the function of T+ and T- to
1.1 Point-to-Paint/4-Wire Full Duplex( Fig. 3-
1
)
P‘
r
espectively
1.2 Point-to-Pointi2-Wire Half Duplex( Fig. 3-2
)
Before operating, user must complete the instal-
lation according to the procedure mentioned in Sec-
2. Multidrop
tion 2-
1
Multidrop configuration means that more than
two devices can be linked all together to communi-
cate one another through many IC-485 devices. In
this configuration, one of the IC-485 devices will be
connected to a master device and the rest of IC-485
devices will be connected to many other slaver de-
vices.
Once the installation had been done, the device
should operate as the setting function.
2.1 Multidrop/4-Wire Full Duplex( Fig. 3-3
2.2 Multidrop/2-Wire Half Duplex( Fig. 3-4
)
)
3. Simplex/Transmit, Receive Only( Fig. 3-5 )
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6
IC-485S/IC-485SI
IC-485S/IC-485SI
OPERATION
OPERATION
3-2 POINT-TO-POINT/2-WIRE HALF DU-
3 -1 POINT-TO-POINT/~-WIRE FULL DU-
PLEX
A
B
Configuration:
Configuration:
A
B
TxON,RxON
TxON,RxON
DCE/DTE
Figure 3-2 POINT-TO-POINT/2-WIRE H-
ALF DUPLEX
Figure 3-
1
POINT-TO-POINT/4-WIRE FULL
DUPLEX
In above Figure if the PC 1 is a DTE device, then
the Device A should set the SW1 to DCE. If the PC1
is a DCE device, then the Device A should set the
SW1 to DTE. The switch setting method for the
Device B is identical to Device A’s.
Note: All the SW1 setting in this Chapter are follow-
ing the setting rule indicated in this Section.
9
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8
IC-485S/IC-485SI
OPERATION
IC-485S/IC-485SI
OPERATION
__
3-3 MULTIDROP/4-WIRE FULL DUPLEX
3-4 MULTIDROP/2-WIRE HALF DUPLEX
Bl
B1
A
PC1 =>
=>PC2
PC1
COM1/
COM2
COM1/
COM2
COM1/
COM2
COM1/
COM2
Ii-485
b2
=>PC3
COM1/
COM2
=>PC4
COM1/
COM2
Configuration:
Configuration:
Bn
DCE/DTE
TxRTS, RxON
B
TxRTS,
Note: Bn means any one of the B 1, B2, B3 and SO on.
Note: Bn means any one of the B 1, B2, B3 and so on.
Figure 3-3 MULTIDROP/4-WIRE FULL DUPLEX
Figure 3-4 MULTIDROP/2-WIRE HALF DU-
PLEX
10
11
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IC-485S/IC-485SI
IC-485S/ IC-485SI
OPERATION
OPERATION
3-5 SIMPLEX/ TRANSMIT, RECEIVE ONLY
(for IC-485S only)
3-6 MONITORING
Device 2
B1
Device 1
=>
=>PC2
PC1
COM1/
COM2
COM1/
COM2
=>PC3
COM1/
COM2
COM2
Note: R+ and R- signals are converted and linked to
the RS-232 port, DB-25 pm 3. R’ + and R’
(T+ and T-) signals are converted and linked
to the RS-232 port, DB-25 pm 2.
=>PC4
COM1/
COM2
Configuration:
Configuration:
DCE/ DTE
DCE/ DTE
TxON, RxON
A
TxON, RxON
Bn
M O N I
TxRTS, RxON
A
Note: Bn means any one of the B 1, B2, B3 and so on.
Note: The RTS must be at the low level in monitoring
mode.
Figure 3-5 SIMPLEX/TRANSMIT, REC-EIVE
ONLY
Figure 3-6 MONITORING
13
12
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IC-485S/IC-485SI
OTHERS
IC-485S/IC-485SI
OTHERS
4 OTHERS
4-2 SELF TEST
4 -1 TERMINAL BLOCK DEFINITION
To test the internal circuit of the interface con-
verter, connect a dumb terminal to the unit and proc-
ess as follows:
The four screw terminal block has different defi-
nition in different operation modes.
In the DCE/DTE mode, the terminal #l (+V) and
#2(-V) are configured to transmit data, the transmit-
ter; the terminals #3(-V) and #4(+V) are configured
to receive data, the receiver.
1. Set SW1 to DCE (if the dumb terminal is a DTE
configuration).
2. Set SW2 to TxON, RxON.
3. Connect one wire from Tx+(#l) to Rx+(#4),
and connect another wire from TX-(#2) to Rx-
In the MONITOR mode (for IC-485S only), the
terminals #l and #2 are respectively the positive and
negative of receiver #I; the terminal #3 and ##4 are
the positive and negative of receiver #2.
(#3X
4. Set the terminal to full duplex and enter data,
then the data should be displayed on the screen.
5. If this occurs the internal circuit is opera-
tional.
Figure 4-l Terminal Block
14
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15
User’s Manual
APPENDIX A
RS-232 DCE/DTE DESCRIPTION
TROUBLE SHOOTING
at the DC 9V
Power Adapter is available.
Check that the IC-485 is
plugged securely in PC.
Device’s Connector Pin #
Cables
IC-485
transmission
.
.
Check that the 4-wire cable
is connected properly at
Note: The DTE mode device must be connected to
a DCE mode device because the polarity of the
communication signals are different. The
shadow area is a connection example for a
DTE device to a DCE device.
If failure of printing is still exists upon aforesaid
solutions, please contact your dealer for help.
17
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16
User’s Manual
3. Move the computer away from the receiver.
PREVENTING RADIO
ENCE
&
TV INTERFER-
4. Plug the computer into a different outlet so that
computer and receiver and on different branch
circuits.
Warning this equipment generates, uses and radi-
ates radio frequency energy and if not installed and
used in accordance with the instruction manual may
cause interference to radio and television reception.
It has been tested and found to comply with the limits
for a Class A computing device in accordance with
the specifications in Subpart J of Part 15 of FCC
Rules, which are designed to provide reasonable
protection against such interference when operated in
a commerical environment. Operation of this equip-
ment in a residential area is likely to cause interfer-
ence, in which case the user at his own expense will
be required to take whatever measures may be re-
quired to correct the interference.
5. Ensure that the mounting screws, attachment
connector screws and ground wires are tightly
secured.
6. Ensure that good quality, shielded and
grounded cables are used for data communica-
tions.
If necessary, the user should consult the dealer or
an experienced radio/television technician for addi-
tional suggestions.
If this equipment does cause interference to radio
or television reception, which can be determined by
turning the equipment off and on, the user is encour-
aged to try to correct the interference by one or more
of the following measures:
1. Reorient the receiving antenna.
2. Relocate the computer with respect to the re-
ceiver.
18
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19
User’s Manual
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