Onlogic HX310 - COM1 & COM2 Headers

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
RS-232
RS-422
RS-485
1
NC
TX-
TX-/RX-
2
RX
TX+
TX+/RX+
3
TX
RX+
NC
4
NC
RX-
NC
5
GND
NC
NC
6
NC
NC
NC
7
RTS
NC
NC
8
CTS
NC
NC
9
NC
NC/PWR
NC/PWR
10
(KEY)
(KEY)
(KEY)
Motherboard Serial header pinout
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