14
2.3.2 Connector COM2 [RS232]
Pin Designations
COM2 [RS-232]
Pin assignment of the 9 Pin, Male,
SUB-D COM2 [RS-232] Port
Pin#
Symbol Function
1
2 RxD Received
Data
3 TxD Transmitted
Data
4
5 GND Signal
Ground
6
7
RTS
Ready to send output
8
CTS
Clear to send input
9
Pin 1,6,8 is short.
2.3.3 Connector COM3[RS485]
Pin Designations
COM3 [RS-485]
Pin assignment of the 9 Pin, Female,
SUB-D COM3 [RS-485] Port
Pin# Symbol
RS-485 4wire
RS-485 2wire
1
2 Tx+ Transmitted
Data+
Data+
3 Tx- Transmitted
Data-
Data-
4 Rx+ Received
Data+
5 Rx- Received
Data-
6
GND
Signal Ground
Signal Ground
7
8
9
