5. Each Component Function
User’s Manual
61
Serial Port Interface
CAUTION
Serial ports 3 - 6 are implemented by mounting a CONTEC PCI serial communication board
"COM-4(PCI)H" on the CPU board.
The board ID on the CPU board is 0.
When installing the COM-4(PCI)H in a PCI expansion slot, use the board ID other than 0.
SERIAL1, 2(RS-232C Ports)
The product has two channels of RS-232C compliant serial ports supporting up to a baud rate of
115,200bps with a 16-byte transmission-dedicated data buffer and a 16-byte reception-dedicated data
buffer. You can use BIOS Setup (described in Chapter 4) to configure an I/O address, interrupt and
unused state for each of the ports independently. (The same I/O address and IRQ cannot be shared with
any other device.)
Table 5.8. SERIAL 1 and 2 I/O Addresses and Interrupts
COM
I/O address
Interrupt
1
3F8h - 3FFh
2
2F8h - 2FFh
3
3E8h - 3EFh
4
2E8h - 2EFh
IRQ 3
IRQ 4
The BIOS defaults to the following factory settings:
Serial port 1: COM1(3F8h-3FFh),IRQ4
Serial port 2: COM2(2F8h-2FFh),IRQ3
