Siemens SIMEAS P 7KG7100 - Communication Interface

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2.10 Communication interface
Pin-No. RS485-Interface Profibus-Interface
1 Protective Earth Protective Earth
2
3 A B (RxD/TxD-P)
4 RTS CTRL-A
5 GND
EXT
GND
EXT
6 +5 V
EXT
+5 V
EXT
7
8 B A (RxD/TxD-N)
9
The bus is terminated at the connection cable.
The isolated interface supply voltage is provided via the
D-subminiature female connector. Therefore, the matching
resistors for signals can be connected to the cable.
WARNING!
All computing devices connected to the RS485 communication
interface port shall be connected to a SELV circuit and must
comply with the following standard: IEC/EN 60950.