Siemens Simatic 620 Owner's Manual page 143

Gender Changer for COM1
You can convert the COM1/V24 / AG port of the SIMATIC PC family into the usual
25 pin male connector by means of the enclosed gender changer (25 pin / 25 pin).
For this, you only have to plug the gender changer onto the COM1 socket and
secure it with the two hexagon head screws.
The V24 and TTY interfaces for COM1 can be alternately used. The factory set
default value is V24 operation. Switching from V24 to TTY operation is described in
Section 5.1.2.
Serial Port COM2 (V24/Mouse)
The serial port (COM 2) on the Box PC has the following pinout:
Figure 7-2 Serial Port COM 2 (Connector)
Pin No.
1
2
3
4
5
6
7
8
9
SIMATIC Box PC 620 Manual
A5E00131465-01
5
9
6
1
Designation Description
DCD (M5) Receiving signal level
carrier
RxD (D2) Received data
TxD (D1) Transmitted data
DTR (S1) Terminal ready
GND (E2) Functional ground
(reference potential)
DSR (M1) Readiness for operation
RTS (S2) Switch on transmitter
CTS (M2) Ready to transmit status
RI (M3) Incoming call
Hardware Information
Input / Output
Input
Input
Output
Output
-
Input
Output
Input
Input
7-11