Siemens SIMATIC PG 720 P Manual page 102

Hardware Information
Serial Port The serial port (COM2) on the PG 720 has the following pinout:
(RS-232/Mouse)
Figure 8-8
Pin No. Designation
1
2
3
4
5
6
7
8
9
8-14
5
9
6
1
COM2 Serial Port (Connector)
Description
DCD (M5) Data carrier detect
RxD (D2) Receive data
TxD (D1) Transmit data
DTR (S1) Data terminal ready
GND (E2) Ground
DSR (M1) Data set ready
RTS (S2) Request to send
CTS (M2) Clear to send
RI (M3) Incoming call
Input/Output
Input
Input
Output
Output
–
Input
Output
Input
Input
PG 720 P Programming Device
C79000-G7076-C721-02