Ampro Corporation LITTLE BOARD P5X - Manual (Page 35)

Little Board/P5x Technical Manual
2–17
Table 2– 11. Serial Port Connectors (J11, J13)
Ports Pin
Signal
Name Function In/Out
DB25
Pin
DB9
Pin
Serial 1
(J11)
or
Serial 3
(J13)
1
2
3
4
5
6
7
8
9
10
DCD
DSR
RXD
RTS
TXD
CTS
DTR
RI
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
(J11)
or
Serial 4
(J13)
11
12
13
14
15
16
17
18
19
20
DCD*
DSR
RXD
RTS
TXD
CTS
DTR
RI
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
-
Table 2– 12. J11 and J13 Mating Connector
Connector Type Mating Connector
RIBBON 3M 3421-7600
Latching Clip 3505-8020
DISCRETE WIRE MOLEX HOUSING 22-55-2202
PIN 16-02-0103
RS-485 Option
You can configure Serial 1 to operate as a two-wire RS-485 port. Use of the RS-485 option offers a
low cost, easy-to-use communications and networking multi-drop interface that is suited to a wide