User`s manual

Base Unit • 15

 2.2.5 COM1/COM2

GEME offers two serial communications interface ports: COM 1 and COM 2.

IRQ and Address Setting

The IRQ and I/O address range are both assigned by BIOS. The table below

describes COM1/COM2 default settings:

COM Port Mode Bass address IRQ

COM 1 RS-232 3F8h IRQ4

COM 2 RS-232 2F8h IRQ3

COM1/COM2 Pin Assignment

Pin RS-232

1 DCD, Data carrier detect

2 RXD, Receive data

3 TXD, Transmit data

4 DTR, Data terminal ready

5 GND, ground

6 DSR, Data set ready

7 RTS, Request to send

8 CTS, Clear to send

9 RI, Ring indicator

Note: COM2 can also support RS422 or RS485 (with Auto direction function) by

adjusting jumper. The customer has to request this feature while placing

the order.

COM 2

Pin no. RS422 RS485

1 TX- D-

2 TX+ D+

3 RX+ --

4 RX- --

5 GND GND

6 -- --

7 -- --