Hardware Information
7-11
SIMATIC Rack PC 840 Manual
A5E00104826-03
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
hexagon head screws.
The V24 and TTY interfaces for COM1 can be alternately used.
COM 2 Serial Port (V24/Mouse), X31
The serial port (COM 2) on the Rack PC has the following pinout:
1
5
6
9
Figure 7-2 COM 2 Serial Port (Connector)
Pin No.
Designation Description 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) Terminal ready Output
5 GND (E2) Functional ground
(reference potential)
-
6 DSR (M1) Readiness for operation Input
7 RTS (S2) Switch on transmitter Output
8 CTS (M2) Ready to transmit status Input
9 RI (M3) Incoming call Input
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