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Changes from Previous Host Link Systems Appendix B
Note The number of words that can be read and written per frame (i.e., the text lengths) when using C-mode
commands is different for C-series Host Link Units and CS/CJ-series Serial Communications Boards/
Units. A host computer program previously used for C-series Host Link Units may not function correctly if
used for CS/CJ-series PLCs. Check the host computer program before using it and make any correc-
tions required to handle different frame text lengths. Refer to the CS/CJ-series Communications Com-
mands Reference Manual (W342) for details.
RS-422A/485 Ports
Take the following differences into consideration when changing from an existing Host Link System to one
using an RS-422A/485 port on a CS-series Serial Communications Board (CS1W-SCB41 port 2) or a CJ-
series Serial Communications Unit (CJ1W-SCU41 port 1).
CVM1 or CV-
series CPU
Units
CVM1/CV-CPU@@-E No changes have been made
in wiring.
It may be possible to use the host computer
programs without alteration as long as the
same communications settings (e.g., baud rate)
are used. It may be necessary, however, to
change programs to allow for different CS/CJ
command specifications.
CVM1 or CV-
series Host Link
Unit
CV500-LK201 Port 1:
The connector has been
changed from a 25-pin to a 9-
pin connector.
Port 2 set for RS-232C:
The SG signal has been
changed from pin 7 to pin 9.
The following changes are necessary for
half-duplex transmissions that use CD.
Check the system for timing problems when
using SEND, RECV, or CMND to initiate com-
munications from the PLC or timing problems in
sending commands from the host computer. If
necessary, switch to full-duplex transmissions.
The following changes are necessary for
full-duplex transmissions that do not use
CD.
Half-duplex It may be possible to use the host
computer programs without alteration as long
as the same communications settings (e.g.,
baud rate) are used. It may be necessary, how-
ever, to change programs to allow for different
CS/CJ command specifications.
Previous
products
Model number Changes required for CS/CJ-series product
Wiring Other
C-series Host Link
Units
3G2A5-LK201-E
C200H-LK202
3G2A6-LK202-E
Wiring pins have been
changed as shown below.
SDA: Pin 9 to pin 1
SDB: Pin 5 to pin 2
RDA: Pin 6 to pin 6
RDB: Pin 1 to pin 8
SG: Pin 3 to
Not connected
FG: Pin 7 to pin
Connector hood
It may be possible to use the host computer
programs without alteration as long as the
same communications settings (e.g., baud
rate) are used. It may be necessary, however,
to change programs to allow for different text
lengths in frames or different CS/CJ com-
mand specifications. (See note.)
C200HX/HG/HE
Communications
Board
C200HW-COM@@-E No changes have been made
in wiring.
It may be possible to use the host computer
programs without alteration as long as the
same communications settings (e.g., baud
rate) are used. It may be necessary, however,
to change programs to allow for different CS/
CJ command specifications.
Previous
products
Model number Changes required for CS/CJ-series product
Wiring Other
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