Siemens PANEL PC 877 Manuel D’Utilisation

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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 
DCD (M5) 
Receiving signal level carrier 
Input 
RxD (D2) 
Received data 
Input 
TxD (D1) 
Transmitted data 
Output 
DTR (S1) 
Data terminal ready 
Output 
GND (E2) 
System ground (reference potential) 
– 
DSR (M1) 
Ready for operation 
Input 
RTS (S2) 
Request to send 
Output 
CTS (M2) 
Clear to send 
Input 
RI (M3) 
Incoming call 
Input