Serial port 1-4 connector (com1-4) – Avalue EPS-QM87 User Manual
Page 30
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EPS-QM87
30 EPS-QM87 Quick Reference Guide
2.4.17
Serial port 1-4 connector (COM1-4)
Signal
PIN PIN
Signal
UDCDA#
1
2
USINA
USOUTA
3
4
UDTRA#
GND
5
6
UDSRA#
URTSA#
7
8
UCTSA#
URI1
9
10
NC
UDCDB#
11
12
USINB
USOUTB
13
14
UDTRB#
GND
15
16
UDSRB#
URTSB#
17
18
UCTSB#
URI2
19
20
NC
DCD3
21
22
RxDD3
TxDD3
23
24
DTR3
GND
25
26
DSR3
RTS3
27
28
CTS3
URI3
29
30
NC
DCD4
31
32
RxDD4
TxDD4
33
34
DTR4
GND
35
36
DSR4
RTS4
37
38
CTS4
URI4
39
40
NC
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