Habey PRO-6820 - Manual (Page 23)

COM1_COM4:
Pin Signal Name
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
COM2:RS232/RS422/RS485, Pins defined as below:
Pin RS232 (default) RS422 RS485
1 DCD TX- DATA-
2 TXD TX+ DATA+
3 RXD RX+ NC
4 DTR RX- NC
5 GND CND GND
4x COM
3.1.1 Serial Ports (COM1_COM6)
System provides 6x RS232 serial ports:four on front panel and two
reserved inside on the motherboard. COM1_COM4 are standard DB9
interfaces; COM1/COM2:RS422/RS485, COM1/COM2 default setting:
RS485.
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