4 Each Component Function
32
PT-E731, PT-E731S, PT-E731H, PT-E731HS User’s Manual
Serial Port COM3(RS232C/RS422/RS485)
This product has a serial port that corresponds to the communication modes RS232C, RS422 and RS485
You may set communication mode of serial port COM3 by setting switches in PT-E.
Table 4.6 Serial Port Connector (COM3)
Connector used
on the product
D-sub9 pin, male
1
6
23
45
78
9
Function
Pin No.
RS-232C RS-422 RS-485
1 DCD
TX+
DATA+
2 RXD
TX-
DATA-
3 TXD
RX+ -
4 DTR
RX- -
5 GND
GND
GND
6 DSR - -
7 RTS - -
8 CTS - -
9 RI - -
Switching Serial Port COM3 among RS232C, RS422 and RS485
The serial port COM2 corresponds to RS232C; COM3 corresponds to the communication modes RS232C,
RS422 and RS485. Using the serial communication mode setting switches (No.1 to No.7), you can set
communication mode for serial port COM3. The setting method is as follows.
(1) Remove the two screws on the back of PT-E, and remove the cover.
Figure 4.14 Remove the cover
