Communication Interface - Siemens SIMEAS P 7KG7550 Operating Instructions Manual

1.11

Communication Interface

Pin-No.
1 Protective Ground
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 circuit and must
comply with the following standards: UL 1950 and IEC/EN 60950.
RS485-Interface
A
RTS
GND
EXT
+5 V
EXT
B
WARNING!
19
PROFIBUS-Interface
Protective Ground
B (RxD/TxD-P)
CTRL-A
GND
EXT
+5 V
EXT
A (RxD/TxD-N)