Siemens SIMATIC Panel PC 870 Equipment Manual page 99

Serial port COM2 (V24/mouse), X31
The serial port on the computing unit is assigned as follows:
Connector
5 9 5
1
Panel PC 870 Computing Unit Equipment Manual
Edition 12/01
Pin Short Name
No.
1 DCD (M5)
2 RxD (D2)
3 TxD (D1)
4 DTR (S1)
5 GND (E2)
6 DSR (M1)
6 6
7 RTS (S2)
8 CTS (M2)
9 RI (M3)
Hardware Information
Meaning
Data Carrier Detect (car-
rier)
Received data
Transmission data
Data Terminal Ready
Station ground (reference
potential)
Data Set Ready
Request To Send
Clear To Send
Incoming call
Input
Output
Input Input
Output
-
Input
Output
Input
7-9