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4-5SectionApplication Procedure
55
4-5-2 RS-422A/485 Ports
Take the following differences into consideration when changing from an exist-
ing Host Link System to one using an RS-422A/485 port on a CQM1H-series
Serial Communications Board.
Previous Model number
Changes required for CQM1H-series product
products
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
CQM1H command specifications. (See
note.)
C200HX/HG/HE
Communications
Board
C200HW-COMjj-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 CQM1H command specifications.
CS1-series CPU
Unit
CS1G/H-CPUjj
No changes have been
made in wiring.
It may be possible to use the host computer
programs without alteration as long as the
CS1-series Serial
Communications
Board or Unit
CS1W-SCB21/41
CS1W-SCU21
same communications settings (e.g., baud
rate) are used. It may be necessary,
however, to change programs to allow for
different CQM1H command specifications.
CVM1 or
CV-series CPU
Units
CVM1/CV-CPUjj
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
CVM1 or
CV-series Host
Link Unit
CV500-LK201
rate) are used. It may be necessary,
however, to change programs to allow for
different CQM1H command specifications.
Note The number of words that can be read and written per frame (i.e., the text
lengths) when using C-mode Host Link commands is different for C-series Host
Link Units and CQM1H-series Serial Communications Boards. A host computer
program previously used for C-series Host Link Units may not function correctly
if used for CQM1H-series PCs. Check the host computer program before using it
and make any corrections required to handle different frame text lengths.