User manual

COM Port Connectors

The EITX-3000 board provides four D-Sub 9-pin connectors as

COM 1, COM 2, COM 3 and COM 4 serial communications.

COM 1 and COM 2 ports

The EITX-3000 provides two D-Sub 9-pin connectors as COM 1

and COM 2 for RS-232/422/485 serial communications.

RS-232 RS-422 RS-485

Signal Signal Signal

1 DCD Tx- DATA-

2 RxD Tx+ DATA+

3 TxD Rx+ NC

4 DTR Rx- NC

5 GND GND GND

6 DSR NC NC

7 RTS NC NC

8 CTS NC NC

9 RI NC NC

The default setting of COM 1 and COM 2 is RS-232, both COM 1

and COM 2 can be configured to operate in RS-232, RS-422 or RS-

485 mode by adjusting the BIOS setup items of “COM1 RS-

232/422/485 Type” and “COM2 RS-232/422/485 Type” in “Super

I/O COM Ports (UARTS)” of “Super I/O Device” of “Integrated

Peripherals” section at Award BIOS setup.