Communication Interface - Siemens SIMEAS P 7KG7750 Operating Instructions Manual

2.10

Communication Interface

Pin-No.
1
2
3
4
5
6
7
8
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.
All computing devices connected to the RS485 communication
interface port shall be connected to a SELV (Separated Extra Low
Voltage) circuit and must comply with the following standard:
IEC/EN 60950.
RS485-Interface
Modbus and
IEC 60870-5-103
Protective Earth
A
RTS
GND
+5 V
B
WARNING!
PROFIBUS-Interface
Protective Earth
B (RxD/TxD-P)
A (RxD/TxD-N)
60
CTRL-A
GND
+5 V