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Everything is hooked up but nothing is working. What should I do? (Windows)

When you troubleshoot issues with a serial or parallel hybrid device, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:

  • Serial or parallel cables

  • Serial or parallel ports

  • Serial or parallel devices

To test your setup components, try the following:

  • Use the serial or parallel cable, serial or parallel port, and serial or parallel device in another setup to see if the problem is with the components or the setup.

  • Use a different serial or parallel cable, serial or parallel port, and serial or parallel device in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.

When you test your cables, it is recommended that you do the following:

  • Test each cable individually.

  • Use short cables when you are testing.

When you test the serial or parallel ports and serial or parallel device, it is recommended that you do the following:

Note: Some serial devices work only if the COM or LPT port number is between a certain range. For example, COM1 to COM4 for serial and LPT1 and LPT2 for parallel.

Note: There is not an equivalent loopback test that can be performed for parallel devices.