Omron SYSMAC CS Series Programming Manual page 293

Changes from Previous Host Link Systems
Previous Model number
products
CVM1 or CV- CVM1/CV-CPU##-E
series CPU
Units
CVM1 or CV- CV500-LK201
series Host Link
Unit
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 PCs. 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).
Previous Model number
products
C-series Host Link 3G2A5-LK201-E
Units
C200H-LK202
3G2A6-LK202-E
C200HX/HG/HE C200HW-COM##-E
Communications
Board
274
Changes required for CS/CJ-series product
Wiring
No changes have been made
in wiring.
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.
Changes required for CS/CJ-series product
Wiring
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
No changes have been made
in wiring.
Other
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.
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 PC 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.
Other
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.)
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.
Appendix B