Mini-ITX Mainboard Manual
14
JSEL7/JSEL8: RS-232/422/485 Switch Headers
The headers determine that JCOM1A belongs to RS-232 (Default), 422, or 485.
JSEL7
RS-232 RS-422
RS-485
1-3 3-5 3-5
2-4 4-6 4-6
7-9 9-11 9-11
8-10 10-12 10-12
JSEL8
1-2 RS-232
3-4 RS-422
5-6 RS-485
JSEL7
JSEL8
COM3 ~ COM6: Serial Port Connectors
The motherboard has 4 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
1 0
COM 6
COM 5
COM 4
COM 3
10
5V / 12V
