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POC-500 Series
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2.3.3 COM Port (COM2/ COM3/ COM4)
Implemented using industrial-grade ITE8786 Super IO chip (-40 to 85°C) and provide up
to 921600 bps baud rate, the D-Sub male connector (COM2/ 3/ 4) can be configured in
the BIOS as single RS-422/ 485 port (COM2) or three 3-wire RS-232 ports
(COM2/COM3/COM4). Please refer to COM2/ 3/ 4 Port Configuration for configuring
operation mode. An optional 1-to-3 Y-cable is available to connect three RS-232 devices.
COM2/ 3/ 4 Pin 1-to-3 Y-cable
The following table describes the pin definition of the COM port
3-port RS-232 COM2/ 3/ 4 Single port RS-422/ 485 COM2
Pin# COM2 COM3 COM4 Pin# RS-422 RS-485
1 1
2 RX 2 TxD+ TxD+/ RxD+
3 TX 3 RxD+
4 TX 4 RxD-
5 GND GND GND 5 GND GND
6 RX 6
7 TX 7
8 RX 8 TxD- TxD-/ RxD-
9 9