SBC86840 Series All-In-One Mini ITX Board User's Manual
2.3.1
These jumpers select the COM1 port's communication mode to
operate RS-232 or RS-422/485.
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COM1 Mode Select Jumper: JP4, JP5, JP6
Description Function
COM1 Mode
RS-232
Select
(Default)
RS-422
RS-485
Jumper Setting
JP6
JP5
JP6
JP5
JP62
JP5
Jumpers and Connectors
JP4
JP4
JP4
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