User’s Manual
18
JCOM3/4/5/6: Serial Port Connectors
Pin Assignment Pin Assignment
1 -PDCD 2 PSIN
3 PSOUT
data 4
-PDTR
5 GND 6 -PDSR
7 -PRTS 8 -PCTS
9 Ring/5V/12V 10
NC
JP3/4/5/6: Voltage Switch jumpers for JCOM3/4/5/6 ports
The headers are for controlling the Pin9 of JCOM3/4/5/6 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
Remark:
Max output: 12V@500mA for each COM port
