Communication processor and Modbus TCP
13.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1141
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)
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