8-13
PG 720 P Programming Device
C79000-G7076-C721-02
The serial port (COM1) on the PG 720 has the following pinout:
1
13
14
25
Figure 8-7
COM1 Serial Port (Socket)
Pin No.
Designation
Description
Input/Output
2
TxD (D1)
Serial transmit data
Output
3
RxD (D2)
Serial receive data
Input
4
RTS (S2)
Request to send
Output
5
CTS (M2)
Clear to send
Input
6
DSR (M1)
Data set ready
Input
7
GND (E2)
Ground (reference potential)
–
8
DCD (M5)
Data carrier detect
Input
9
+TTY RxD
TTY receive
Input
10
–TTY RxD
TTY receive
Input
18
+TTY TxD
TTY send
Output
19
+20mA
Isolated current source
–
20
DTR (S1)
Data terminal ready
Output
21
–TTY TxD
TTY send
Output
22
RI (M3)
Incoming call
Input
1
–
Shield
–
11-17
–
Not assigned
–
23-25
–
Not assigned
–
Serial Port
(PLC/RS-232/
Modem)
Hardware Information