Detailed descriptions
16.1 Motherboard
SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
16-5
Adapter for COM1
You can convert the COM1 port of the SIMATIC PC family into the usual 25-pin male
connector by means of the enclosed adapter (25-pin / 25-pin). For this, you only have to plug
the adapter onto the COM1 socket and secure it with the two hexagonal head screws.
COM 2 Serial Port (V24/Mouse), X31
The serial port (COM 2) has the following pinout:
COM 2 Serial Port (V24/Mouse)
Pin No. Abbreviations 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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