Communication
8.6 RS485
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
461
The CM01 signal board is RS485-compatible. The following table shows the connector that
provides the physical connection for the signal board and describes the pin assignments.
Table 8- 18 Pin assignments for the S7-200 SMART CM01 Signal Board (SB) port (Port 1)
CM01 Signal Board (SB) port (Port 1)
2 Tx/B RS232-Tx/RS485-B
3 Request-to-
RTS (TTL)
4 M-ground Logic common
6 +5 V DC +5 V, 100 Ω series resistor
Note
The CPU models CPU CR20s, CPU CR30s, CPU CR40s, and CPU CR60s do not support
the use of expansion modules or signal boards.
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