Db25 interfaces, Building db25 female loopback plugs – Comtrol RocketPort PCI series User Manual
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DB25 Interfaces
DB25 Interfaces
This section describes the DB25
interface connectors. Standard
interface modules use female DB25
connectors, while the Surge interface
module, Quadcable, and Octacable
fanouts use male connectors.
This table shows connector information for DB25 connectors.
Building DB25
Female Loopback
Plugs
Loopback connectors are plugs, with pins wired
together as shown, that are used in conjunction with
the RocketPort diagnostic software to test serial ports.
This loopback is used with the Quadcable and
Octacable. To build a DB25 loopback plug for an
Quadcable or Octacable, wire the following pins
together:
•
Pins 2 to 3
•
Pins 4 to 5 to 22
•
Pins 6 to 8 to 20
To build a DB25 loopback plug (surge interface
model) for an RS-422 serial connection, wire the
following pins together:
•
Pins 15 to 19
•
Pins 17 to 25
Interface Modules
Quad/Octacable
Pin
RS-232
Signal
RS-422
Signal
RS-232
Signal
1
Not used
Not used
Not used
2
TxD
Not used*
TxD
3
RxD
Not used*
RxD
4
RTS
Not used*
RTS
5
CTS
Not used*
CTS
6
DSR
Not used*
DSR
7
Signal ground
Signal ground*
Signal ground
8
DCD
Not used*
DCD
9 to 14
Not used
Not used
Not used
15
Not used
RxD+
Not used
16
Not used
Not used
Not used
17
Not used
RxD-
Not used
18
Not used
Not used
Not used
19
Not used
TxD+
Not used
20
DTR
Not used*
DTR
21 to 24
Not used
Not used
Not used
25
Not used
TxD-
Not used
*
All RS-232 signals are present in RS-422 mode. The quad/
octacables do not support RS-422 mode.
Pin 13
Pin 1
Pin 25
Pin 14
DB25 Female
Pin 14
Pin 25
Pin 1
Pin 13
DB25 Male
Pin 13
Pin 1
RS-232 Only (Back View)
Pin 14
Pin 25
Pin 25
Pin 14
Pin 13
Pin 1
RS-422 Only (Back View)