If a cable is used, then it should be a straight through cable. No cabling is required as these plugs are designed to connect directly to the back of a PC. The red lines and gray dots show the connections that need to be made. It's the rear view of the male DB-25 connector that's required for the plug. This diagram shows the connections that need to be made. We believe that this plug will work with all styles of parallel ports. However, over time several changes have taken place to the electrical interface with the introduction of enhanced and bi-directional parallel ports. The parallel port on IBM compatible PC's have always used a DB-25 connector. Specifications for Parallel Loopback plug It's the rear view of the female DB-9 connector that's required for the plug. This diagram shows the pinout connections that need to be made. Data carrier detect, Data set ready and Data terminal ready (1, 6 & 4).Request to send and Clear to send (7 & 8).To make the loop back plug the following pins need to be connected together If you don't want to make your own plugs, you can always purchase our serial and parallel loopback plugs. The DB-9 connector as the following 9 pins. The serial port on IBM compatible PC's conform to the RS232 electrical standard and use a male DB-9 connector.
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