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The following diagram shows the wiring in the RS-422 cables used to connect
CPM1 PCs to a B500-AL004 Link Adapter. In both the Link Adapter/RS-422
Adapter connections and the RS-422 Adapter/RS-422 Adapter connections,
connect the SG, RDA, RDB, SDA, and SDB terminals to the same terminals in
the other Adapter.
25-pin D-sub Connector
Use a straight RS-232C
cable to connect to the
host computer’s
RS-232C port.
9-pin D-sub Connector
Signal
Pin no.
1
2
3
4
5
6
7
8
9
RDB
–
SG
–
SDB
RDA
FG
–
SDA
3G2A9-AL004-E Link Adapter
RS-422 Adapter
SG
RDA
RDB
SDA
SDB
CPM1 CPU Unit
Note 1. The maximum length of the RS-422 cable should be 500 m.
2. Set the termination resistance switch to “ON” (upper side) for the Link
Adapters on both ends of the Host Link system and for the RS-422 Adapter.
Always use crimp connectors when wiring the RS-422 Adapters. Use M3 termi-
nal screws and tighten the screws securely (0.5 N m).
6.2 mm max.
Fork terminal
6.2 mm max.
Ring terminal
Wiring and Connections
Section 3-4
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