5. Each Component Function
User’s Manual
53
Serial Port Interface
RS-232C Ports (Serial ports A and B)
The BOX-PC is equipped with two RS-232C-compliant serial port
connectors (SERIAL1: Serial port A and SERIAL2: Serial port B).
Each port can be set independently to COM1-COM4 or "not in use"
by BIOS setup (the identical COM number cannot be specified).
Table 5.5. 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
IRQ 5
IRQ 7
IRQ 9
IRQ 10
IRQ 11
IRQ 15
The BIOS defaults to the following factory settings:
Serial port A : COM1(3F8h-3FFh),IRQ4
Serial port B : COM2(2F8h-2FFh),IRQ3
Table 5.6. Serial Port Connector
Pin No.
1
2
3
4
5
6
7
8
9
Connector used on the unit 9-socket D-SUB (MALE)
Signal
CD
RD
TD
DTR
GND
DSR
RTS
CTS
RI
Direction
Input
Input
Output
Output
-----
Input
Output
Input
Input
1 5
9
6
No.4-40UNC
Inch thread
Meaning
Carrier detect
Received data
Transmitted data
Data terminal ready
Signal ground
Data set ready
Request to send
Clear to send
Ring indicator
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