Parallel Port Loopback plug |
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The parallel port on IBM compatible PCs have always used a DB-25 connector. However, over time several changes have taken place to the electrical interface with the introduction of enhanced and bi-directional parallel ports. We believe that this plug will work with all styles of parallel ports.
To make the loop back plug the following pins need to be connected together:
This diagram shows the connections that need to be made. It's the rear view of the male DB-25 connector that's required for the plug. The red lines and grey dots show the connections that need to be made.
![]() Male DB-25 connector - Rear view
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