Siemens SICAM RTU - Pin Assignment; Unbalanced Interchange Circuit V.24;V.28; Balanced Interchange Circuit X.24;X.27; Protocol Elements

System Components
102 SICAM RTUs, SICAM AK 3 User Manual
Edition 07.2016, DC2-028-2.03
2.4.1.2 Pin Assignment
The serial interface module SM-2551 uses the plugs X2 and X3 of CP-2016 and CP-2019.
The pin assignment depends on the operation mode of the supported protocols. You find the
information thereto in the SICAM AK 3 System Description, chapter “System Components and
Technical Data”, section “Protocol Elements”.
2.4.1.2.1 Unbalanced Interchange Circuit V.24/V.28
V.23 dedicated line, VFT channel, V.28 asynchronous
2.4.1.2.2 Balanced Interchange Circuit X.24/X.27
V.11 isochronous
Pulse is transmitted
Pulse is received