14 [Documentation number: 2000430 Rev B] Building Cables for RocketPort Products
DB25 Loopback Plugs
DB25 Loopback
Plugs
A loopback plug is a DB259 serial port plug with pins wired together. You can use
it with application software (for example, Test Terminal) to test serial ports.
RS-232 Female
Loopback Plug
The following RocketPort models support the female loopback plug for RS-232
port:
• RocketPort PCI
• RocketPort Universal PCI
• RocketPort Plus Universal PCI
• RocketPort ISA
Quadcable and Octacable use the RS-232 female
loopback plug. 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
RS-422 Female
Loopback Plug
The following RocketPort models support the female loopback plug for RS-422
port:
• RocketPort PCI
• RocketPort Universal PCI
• RocketPort ISA
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
RS-232 Male
Loopback Plug
The following RocketPort models support the female loopback plug for RS-232
port:
• RocketPort PCI
• RocketPort Universal PCI
This the standard 8 and 16-port DB25 interface
modules use the RS-232 male loopback plug. To build
a DB25 loopback plug for an RS-232 serial
connection, wire the following pins together:
•Pins 2 to 3
• Pins 4 to 5 to 22
• Pins 6 to 8 to 20
RS-422 Male
Loopback Plug
The following RocketPort models support the female loopback plug for RS-422
port:
• RocketPort PCI
• RocketPort Universal PCI
To build a DB25 loopback plug for an RS-422 serial
connection, wire the following pins together.
• Pins 15 to 19
• Pins 17 to 25
Pin 13Pin 1
RS-232 Onl
(Back View)
Pin 14
Pin 25
Pin 25Pin 14
Pin 13Pin 1
RS-422 Only (Back View)
Pin 13 Pin 1
Pin 14Pin 25
RS-232 Only (Back View)
Pin 25 Pin 14
Pin 1Pin 13
RS-422 Only (Back View)
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