User’s Manual
16
Serial Port Connectors:
The motherboard has 6 Serial Port Connectors for connecting RS-232 Port.
JCOM1/2: Serial Port Connectors
Pin Assignment
1 Carrier
detect
(DCD)
2
Received data (RXD)
3
Transmitted data (TXD)
4
Data terminal ready (DTR)
5 Signal
ground
(GND)
6
Data set ready (DSR)
7
Request to send (RTS)
8
Clear to send (CTS)
9
Ring / 5V / 12V
JP1/2: Voltage Switch jumpers for JCOM1/2 ports
The headers are for controlling the Pin9 of JCOM1/2 ports to switch
Ring/5V/12V.
2
1
Pin 1-2 Close:
Pin9=5V
4
3
Pin 3-4 Close:
Pin9=Ring
(Default)
6
5
Pin 5-6 Close:
Pin9=12V
mark:
Max output: 12V@500mA for each COM port
