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4.10 Serial Port Connectors
The HS-4701 offers two NS16C550 compatible UARTs with
Read/Receive 16-byte FIFO serial ports and four internal 10-pin
headers. There is one RS-422/485 connector.
CN11~CN14: COM1~COM4 Connectors (5x2 Header)
PIN Description PIN Description
1
DCD0
2
3
RXDD0
4
5
TXDD0
6
7
DTR0
8
9
GND
10
11
DCD1
12
13
RXDD1
14
15
TXDD1
16
17
DTR1
18
19
GND
20
21
DCD2
22
23
RXDD2
24
25
TXDD2
26
27
DTR2
28
29
GND
30
31
DCD3
32
33
RXDD3
34
35
TXDD3
36
37
DTR3
38
39
GND
40
CN9: RS-422/485 Connector
PIN
Description PIN Description
1
TX-
3
RX+
5
GND
7
RTS+
9
CTS-
DSR0
1
2
RTS0
DCD0
DSR0
CTS0
RXDD0
RTS0
RI0
TXDD0
CTS0
N/C
DTR0
RI0
GND
N/C
DSR1
DCD1
DSR1
RTS1
RXDD1
RTS1
CTS1
TXDD1
CTS1
RI1
DTR1
RI1
N/C
GND
N/C
DSR2
DCD2
DSR2
RXDD2
RTS2
RTS2
TXDD2
CTS2
CTS2
DTR2
RI2
RI2
GND
N/C
N/C
DCD3
DSR3
DSR3
RXDD3
RTS3
RTS3
TXDD3
CTS3
CTS3
DTR3
RI3
GND
N/C
RI3
N/C
39
40
2
TX+
TX-
1
4
RX-
RX+
3
6
RTS-
GND
5
8
CTS+
RTS+
7
10
N/C
CTS-
9
COM1
COM2
COM3
COM4
2
TX+
4
RX-
6
RTS-
8
CTS+
10
N/C
25
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