Communication processor and Modbus TCP
13.2 Biasing and terminating an RS485 network connector
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1089
The CB 1241 provides internal resistors for terminating and biasing the network. To
terminate and bias the connection, connect TRA to TA and connect TRB to TB to include the
internal resistors to the circuit. CB 1241 does not have a 9-pin connector. The following table
shows the connections to a 9-pin connector on the communications partner.
Table 13- 2 Termination and bias for the CB 1241
Terminating device (bias ON)
Non-terminating device (bias OFF)
Connect M to the cable shield
A = TxD/RxD - (Green wire / Pin 8)
③ B = TxD/RxD + (Red wire / Pin 3)
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