3.10 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.
ꢂ CN11~CN14: COM1~COM4 Connectors (5x2 Header)
PIN Description PIN Description
1
DCD0
RXDD0
TXDD0
DTR0
GND
DCD1
RXDD1
TXDD1
DTR1
GND
DCD2
RXDD2
TXDD2
DTR2
GND
DCD3
RXDD3
TXDD3
DTR3
GND
2
DSR0
RTS0
CTS0
RI0
1
2
3
4
DCD0
RXDD0
TXDD0
DTR0
DSR0
RTS0
CTS0
RI0
5
6
8
COM1
COM2
COM3
COM4
7
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
N/C
GND
N/C
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
DSR1
RTS1
CTS1
RI1
DCD1
RXDD1
TXDD1
DTR1
DSR1
RTS1
CTS1
RI1
GND
N/C
N/C
DCD2
RXDD2
TXDD2
DTR2
DSR2
RTS2
CTS2
RI2
DSR2
RTS2
CTS2
RI2
GND
N/C
N/C
DCD3
RXDD3
TXDD3
DTR3
DSR3
RTS3
CTS3
RI3
DSR3
RTS3
CTS3
RI3
GND
N/C
N/C
39 40
ꢂ
CN9: RS-422/485 Connector
PIN Description PIN Descriptio
n
TX-
RX+
1
3
5
7
9
2
4
6
8
TX+
RX-
1
3
5
7
9
TX-
2
TX+
GND
RTS+
CTS-
RTS-
CTS+
RX+
4
RX-
GND
RTS+
CTS-
6
RTS-
CTS+
N/C
10 N/C
8
10
15
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