Communication processor and Modbus TCP
12.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
708 System Manual, 03/2014, A5E02486680-AG
Case 1: RS422 with cable break detection
● Mode of operation: RS422
● Receive line initial state: Reverse bias (biased with R(A) > R(B) > 0V)
● Cable break: Cable break detection enabled (transmitter always active)
Case 2: RS422 No cable break detection, forward bias
● Mode of operation: RS422
● Receive line initial state: Forward bias (biased with R(B) > R(A) > 0 V)
● Cable break: No cable break detection (transmitter enabled only while transmitting)
Case 3: RS422: No cable break detection, no bias
● Mode of operation: RS422
● Receive line initial state: no bias
● Cable break: No cable break detection (transmitter enabled only while transmitting)
Bias and termination are added by the user at the end nodes of the network.
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