Aaeon SBC-400 User Manual page 36

Half-size 486 all-in-one cpu card with cache
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Pin
Signal
1
TX-
4
RX-
2
TX+
3
RX+
5
Ground
You can select the serial ports' IRQs by setting JP9 as follows:
COMA
COMB
IRQ3
IRQ4
IRQ4
IRQ3
Data-
]
[
Data+
]
[
JP9 setting
Pin
Signal
1
TX-
4
RX-
2
TX+
3
RX+
5
Ground

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