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Table 2-10. RS232 Serial Port Connection
Ports Pin # Signal Name Function In/Out DB25 Pin DB9 Pin
Serial 1 (J8)
or
Serial 3 (J11)
1
2
3
4
5
6
7
8
9
10
DCD
1
DSR
1
RXD
RTS
TXD
CTS
DTR
1
RI
1
GND
N/A
Data Carrier Detect
Data Set Ready
Receive Data
Request To Send
Transmit Data
Clear to Send
Data Terminal Ready
Ring Indicator
Signal Ground
No Connection
IN
in
in
out
out
in
out
in
-
-
8
6
3
4
2
5
20
22
7
-
1
6
2
7
3
8
4
9
5
-
Serial 2 (J8)
or
Serial 4 (J11)
11
12
13
14
15
16
17
18
19
20
DCD
1
DSR
1
RXD
RTS
TXD
CTS
DTR
1
RI
1
GND
TXT
Data Carrier Detect
Data Set Ready
Receive Data
Request To Send
Transmit Data
Clear to Send
Data Terminal Ready
Ring Indicator
Signal Ground
TxD at TTL level
IN
in
in
out
out
in
out
in
-
-
8
6
3
4
2
5
20
22
7
-
1
6
2
7
3
8
4
9
5
-
Note 1: Not supported on Serial 3 and Serial 4
Table 2-11. RS485/RS422 Serial Port Connection
Ports Pin #
Signal
Name Function
DB25
Pin
DB9
Pin
Serial 1 (J8)
or
Serial 3 (J11)
3
4
5
6
9
RXD-
TXD+
TXD-
RXD+
GND
Receive Data -
Transmit Data +
Transmit Data -
Receive Data +
Signal Ground
3
4
2
5
7
2
7
3
8
5
Serial 2 (J8)
or
Serial 4 (J11)
13
14
15
16
19
RXD-
TXD+
TXD-
RXD+
GND
Receive Data -
Transmit Data +
Transmit Data -
Receive Data +
Signal Ground
3
4
2
5
7
2
7
3
8
5
Note: For RS485, externally connect TXD+ to RXD+ and TXD- to RXD-