BI94GS-IAB
15
COM3 & COM4: Serial Port Connectors
The motherboard has 2 Serial Port Connectors for connecting RS-232 Port.
Pin
Assignment
1 -PDCD
2 PSIN
3 PSOUT
data
4 -PDTR
5 GND
6 -PDSR
7 -PRTS
8 -PCTS
9 -PRI
1
9
2
10
COM4
COM3
10
5V / 12V
JSEL5_6: Voltage Switch Header for COM3 & COM4 *
This header is for controlling the 10Pin of COM3 & COM4 to switch 5V or 12V.
Pin 1-3 Close:
+5V for COM3
Pin 2-4 Close:
+5V for COM4
Pin 3-5 Close:
+12V for COM3
Pin 4-6 Close:
+12V for COM4
2 4
1 3
Pin 1-3, 2-4 Close:
+5V (Default)
1
5
2
6
6
4
5
3
Pin 3-5, 4-6 Close:
+12V
