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Pin
Function
1
+12V
2
GND
3
GND
4
+5V
Pin
Function
1
GND
2
-5V
3
GND
4
-12V
The SBC-590 offers two RS-232 serial ports, COM1 and COM2,
which let you connect to serial devices (a mouse, printers, etc.)
or a communication network. CN18 is COM1, and CN12 is
COM2.
You can disable each port or select its
address (3F8H [COM1], 2F8H [COM2] or
3E8H) using the BIOS Advanced Setup
program, covered in Chapter 4.
Different devices implement the RS-232
standard in different ways. If you are having problems with a serial
device, be sure to check the pin assignments for the connector.
The following figure shows the pin assignments for the card's RS-
232 ports:
Chapter 3 Connecting Peripherals
D C D
1
D S R
6
R X
2
R T S
7
T X
3
C T S
8
D T R
4
RI
9
G N D
5
31
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