Comtrol PCI Series - Manual

RocketPort® ISA and PCI Series Building Loopback Plugs Hardware Tech Tip 1 of 2
Introduction
Loopback plugs are used with the diagnostic software to
test serial ports. This Hardware Tech Tip discusses
building loopback plugs for use with the following
RocketPort cards:
• RocketPort ISA- and PCI-bus boards that use an
external RS-232 or RS-232/422 interface box
• RocketPort ISA- and PCI-bus boards that use the
Quadcable or Octacable interfaces
• RocketPort 4J or 8J boards
Note: The Hardware Installation Cards contain
information about how to build loopback plugs for
the RocketPort 485 and RocketPort PCI 422 cards .
Building DB25 Male Loopback Plugs
Wire the following pins
together for an RS-232 plug.
• 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 plug.
• Pins 15 to 19
• Pins 17 to 25
Building DB25 Female Loopback Plugs
Wire the following pins
together for an RS-232 plug.
• 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 plug.
• Pins 15 to 19
• Pins 17 to 25
Building DB9 Female Loopback Plugs
Wire the following pins together for
an RS-232 plug:
• Pins 1 to 4 to 6
• Pins 2 to 3
• Pins 7 to 8 to 9
Building RJ45 Loopback Plugs
Wire the following pins together for an
RJ45 plug:
• Pins 4 to 5
• Pins 1 to 8
• Pins 2 to 6 to 7
Building RJ11 Loopback Plugs
Wire the following pins together for an
RJ11 plug:
• Pins 1 to 5 to 6
• Pins 3 to 4
Pin 13 Pin 1
RS-232 Only (Back View)
Pin 25 Pin 14
Pin 25 Pin 14
RS-422 Only (Back View)
Pin 13 Pin 1
Pin 13 Pin 1
RS-232 Only (Back View)
Pin 14 Pin 25
Pin 25 Pin 14
RS-422 Only (Back View)
Pin 1 Pin 13
Pin 1 Pin 5
Pin 6 Pin 9
RS-232 Only
(Back View)
1 8
Plug
Top View
Cable
1 6
Plug
Top View
Cable
RocketPort
®
ISA and PCI Series
Building Loopback Plugs
Hardware Tech Tip