Siemens SIMATIC PANEL PC 877 User Manual
Page 199
Detailed descriptions
17.1 Motherboard
SIMATIC Panel PC 877
Operating instructions, Release 07/2006, A5E00877780-01
17-7
COM 2 serial interface (V24/Mouse), X31
The serial interface (COM 2) has the following pinout:
COM 2 serial interface (V24/Mouse)
PinNo.
Abbreviation
Meaning
Input/Output
1
DCD (M5)
Receiving signal level carrier
Input
2
RxD (D2)
Received data
Input
3
TxD (D1)
Transmitted data
Output
4
DTR (S1)
Data terminal ready
Output
5
GND (E2)
System ground (reference potential)
–
6
DSR (M1)
Ready for operation
Input
7
RTS (S2)
Request to send
Output
8
CTS (M2)
Clear to send
Input
9
RI (M3)
Incoming call
Input