User`s manual

Base Unit 13
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:
COM1/COM2 Pin Assignment
COM Port Mode Bass address IRQ
COM 1 RS-232 3F8h IRQ4
COM 2 RS-232 2F8h IRQ3
Table 2-6: IRQ and Address Setting
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
Table 2-7: COM1 Pin Assignment
Note: COM 2 can also support RS422 or RS485 (without
Auto direction function) by adjusting the jumper.
Please refer to the EBC board manual for jumper
configuration. This feature is available on request
when placing the order.