AXIOMTEK SYM76996VGGA Manual page 17

User's Manual
Serial Port Connectors:
The motherboard has 6 Serial Port Connectors for connecting RS-232 Port.
JCOM1/2: Serial Port Connectors
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.
mark:
Max output: 12V@500mA for each COM port
16
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
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