5. Each Component Function
60
BX-956S User’s manual
Serial Port Interface: SERIAL A, B
The product has 2 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 “Chapter 4 BIOS Setup” 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 5.10. SERIAL A, B, I/O Addresses and Interrupts
SERIAL
I/O address
Interrupt
A
3F8h - 3FFh
IRQ 4
B
2F8h - 2FFh
IRQ 3
Table 5.11. Serial Port Connector
Connector type
9-pin D-SUB (MALE)
Pin No. Signal name
Meaning
Direction
1
CD
Carrier detect
Input
2
RD
Received data
Input
3
TD
Transmitted data
Output
4
DTR
Data terminal ready
Output
5
GND
Signal ground
-----
6
DSR
Data set ready
Input
7
RTS
Request to send
Output
8
CTS
Clear to send
Input
9
RI
Ring indicator
Input
1
5
9
6
No.4-40UNC
Inch screw threads
