7
7-14
Programming Device PG 740
C79000-G7076-C742-01
The serial port (COM1) on the PG 740 has the following pinout:
1
13
14
25
Figure 7-6 COM1 Serial Port (Socket Connector)
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) Functional 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 - Unassigned -
23-25 - Unassigned -
Serial Port (PLC/
V.24/Modem)
Hardware Information
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