User`s manual

SBC86831 Series All-In-One Mini ITX Board User’s Manual
Jumpers and Connectors
10
2.3.1 COM1 Mode Select Jumper: JP1, JP2, JP3
These jumpers select the COM1 port’s communication mode to
operate RS-232 or RS-422/485.
Description Function Jumper Setting
RS-232
(Default)
JP1 JP2 JP3
RS-422
JP1 JP2 JP3
COM1 Mode
Select
RS-485
JP1 JP2 JP3