4. Each Component Function
PT-955LXC-DC5311 User’s manual
27
Serial Port Interface: SERIAL A - B
SERIAL A, B (RS-232C Ports)
The product has 2 ports 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 5 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.)
Please refer to “Chapter 6 I/O Port Addresses”
for more information on I/O address and register function.
Table 4.6. SERIAL A, B, C, D, E I/O Addresses and Interrupts
SERIAL I/O
address
Interrupt
A 3F8h
-
3FFh
IRQ 4
B
2F8h - 2FFh
IRQ 3
C (touch panel)
D (system reserved)
E (system reserved)
2A0h-2A7h
IRQ5
Table 4.7. Serial Port Connector
Connector used on
the product
9-pin D-SUB (MALE)
1
5
9
6
No.4-40UNC
Inch screw
threads
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