Gigabyte MNIC8PI User Manual page 24

30) BKLTEN_CON (Back light Inverter Enable/Disable Jumper)
31) JRS2/JRS3/JRS4/JRS5 (RS232/RS422/RS485 Mode Select Jumper)
Hardware Installation
JRS2 JRS3 JRS4
Open: Disable Back light Inverter.
Short: Enable Back light Inverter.
JRS5
1
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JRS2
Pin No. Definition
1 RS485 D- Signal
2 COM2 Pin 1
3 RS232 DCD Signal
JRS3
Pin No. Definition
1 RS485 D+ Signal
2 COM2 Pin 2
3 RS232 RXD Signal
JRS4
Pin No. Definition
1 RS422 D- Signal
2 COM2 Pin 4
3 RS232 DTR Signal
JRS5
Pin No. Definition
1 RS422 D- Signal
2 COM2 Pin 3
3 RS232 TXD Signal