Frequently Asked Question - Are wiring diagrams available to make my own loopback adapters?

Are wiring diagrams available to make my own loopback adapters?

Yes. Wiring diagrams for 9-pin and 25-pin serial port loopbacks and 25-pin parallel port loopbacks are posted on our website. This information is provided as a courtesy to our customers. PC-Doctor does not offer assistance for problems related to personally manufactured loopback adapters.