Personal Computer User Manual

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