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Hardware Information
Serial Port (PLC/
V.24/Modem)
7
7-14
The serial port (COM1) on the PG 740 has the following pinout:
Figure 7-6
COM1 Serial Port (Socket Connector)
Pin No. Designation
Description
2
TxD (D1)
Serial transmit data
3
RxD (D2)
Serial receive data
4
RTS (S2)
Request to send
5
CTS (M2)
Clear to send
6
DSR (M1)
Data set ready
7
GND (E2)
Functional ground (reference
potential)
8
DCD (M5)
Data carrier detect
9
+TTY RxD
TTY receive
10
-TTY RxD
TTY receive
18
+TTY TxD
TTY send
19
+20mA
Isolated current source
20
DTR (S1)
Data terminal ready
21
-TTY TxD
TTY send
22
RI (M3)
Incoming call
1
-
Shield
11-17
-
Unassigned
23-25
-
Unassigned
1
14
25
13
Input/Output
Output
Input
Output
Input
Input
-
Input
Input
Input
Output
-
Output
Output
Input
-
-
-
Programming Device PG 740
C79000-G7076-C742-01
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