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The software's Help file has a wealth of troubleshooting information and tests, so check there if you are having problems with your timer communications.

Version 10 and below: Support -> Troubleshooting -> Serial Port Troubleshooting

Version 11 and above: Troubleshooting -> Serial Port Troubleshooting

If it pertains to a USB to Serial Adapter, please also refer to http://www.derbytalk.com/viewtopic.php?f=5&t=2454.

See also our instructional videos on Serial Port Communications Troubleshooting.