Hardware Installation
4
DB25 Interfaces
DB25 Interfaces
Use the following information for DB25 connectors.
Standard interface boxes use female connectors, while the
Surge interface boxes use male connectors.
This table shows connector information for connectors.
Building DB25
Female Loopback
Plugs
Loopback plugs are used with the diagnostics to test serial ports.
Wire the following pins together for an RS-422
loopback plug (Surge interface box).
•
Pins 15 to 19
•
Pins 17 to 25
Building DB25 Male
Loopback Plugs
Loopback plugs are used with the diagnostics to test
serial ports.
This loopback plug is used with the standard 8- and
16-port DB25 interface boxes.
•
Pins 2 to 3
•
Pins 4 to 5 to 22
•
Pins 6 to 8 to 20
Wire the following pins together for an RS-422
loopback plug.
•
Pins 15 to 19
•
Pins 17 to 25
Pin
RS-232
Signal
RS-422
Signal
1
Not used
Not used
2
TxD
Not used*
3
RxD
Not used*
4
RTS
Not used*
5
CTS
Not used*
6
DSR
Not used*
7
Signal ground
Signal ground*
8
DCD
Not used*
9 to 14
Not used
Not used
15
Not used
RxD+
16
Not used
Not used
17
Not used
RxD-
18
Not used
Not used
19
Not used
TxD+
20
DTR
Not used*
21-24
Not used
Not used
25
Not used
TxD-
* All RS-232 signals are present in RS-422 mode.
Pin 13
Pin 1
Pin 25
Pin 14
DB25 Female
Pin 14
Pin 25
Pin 1
Pin 13
DB25 Male
Pin 25
Pin 14
Pin 13
Pin 1
RS-422 Only (Back View)
Pin 13
Pin 1
Pin 14
Pin 25
RS-232 Only (Back View)
Pin 25
Pin 14
Pin 1
Pin 13
RS-422 Only (Back View)
