Comtrol RocketPort PCI series - Manual (Page 8)

8
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)