Onlogic HX310 Product Manual page 19

COM1 & COM2
The two on-board COM headers utilize standard 9-pin 2.00mm pitch male pin headers with the pin
configuration in the chart below. These serial ports support RS-232, RS-422 Full-Duplex, and RS-485
half-Duplex configurations. The serial port communication mode can be selected in the BIOS
configuration. Refer to the BIOS manual (Appendix C) for configuration instructions.
Pin
1
2
3
4
5
6
7
8
9
10
Motherboard Serial header pinout
RS-232 RS-422
NC TX-
RX TX+
TX RX+
NC RX-
GND NC
NC NC
RTS NC
CTS NC
NC NC/PWR
(KEY) (KEY)
RS-485
TX-/RX-
TX+/RX+
NC
NC
NC
NC
NC
NC
NC/PWR
(KEY)
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