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Hardware Information
Serial Port
The serial port (COM1) on the PG 720 has the following pinout:
(PLC/RS-232/
Modem)
Figure 8-7 COM1 Serial Port (Socket)
Pin No.
2
3
4
5
6
7
8
9
10
18
19
20
21
22
1
11-17
23-25
8-12
1
14
25
13
Designation
Description
TxD (D1)
Serial transmit data
RxD (D2)
Serial receive data
RTS (S2)
Request to send
CTS (M2)
Clear to send
DSR (M1)
Data set ready
GND (E2)
Ground (reference
potential)
DCD (M5)
Data carrier detect
+TTY RxD
TTY receive
–TTY RxD
TTY receive
+TTY TxD
TTY send
+20mA
Isolated current source
DTR (S1)
Data terminal ready
–TTY TxD
TTY send
RI (M3)
Incoming call
–
Shield
–
Not assigned
–
Not assigned
Input/Output
Output
Input
Output
Input
Input
–
Input
Input
Input
Output
–
Output
Output
Input
–
–
–
PG 720 PII Programming Device
C79000-G7076-C756-02
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