Detailed descriptions
16.1 Motherboard
SIMATIC Box PC 627
Operating Instructions, Release 05/2006, A5E00362052-03
16-9
Serial port COM1, X135
The COM1 serial port has the following pin assignment:
Serial interface COM1
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) Functional 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
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