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RS232 COM pin headers
The mainboard includes three COM pin headers onboard.
COM2
Pin
Signal
1
-DCDA_2
3
TXDA_2
5
GND
7
-RTSA_2
9
-RIA_2
COM3
Pin
Signal
1
-DCDA_3
3
TXDA_3
5
GND
7
-RTSA_3
9
-RIA_3
COM4
Pin
Signal
1
-DCDA_4
3
TXDA_4
5
GND
7
-RTSA_4
9
-RIA_4
Pin
Signal
2
RXDA_2
4
-DTRA_2
6
-DSRA_2
8
-CTSA_2
10
—
Pin
Signal
2
RXDA_3
4
-DTRA_3
6
-DSRA_3
8
-CTSA_3
10
—
Pin
Signal
2
RXDA_4
4
-DTRA_4
6
-DSRA_4
8
-CTSA_4
10
—
14
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