OBD-II Scan Tool Software
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ProScan Help - Setting User Preferences

ProScan Settings Dialog

The ProScan Settings dialog allows you to modify critical application settings.
  • Serial Port

The selected port will be the communication port used by ProScan. The list will only display serial ports that are available on your machine.

  • ELM Timeout

You can lower this value to attempt to speed up communications. The faster that you can collect data, the more data points you can collect for charts, and the more accurate your dyno and track calculations will be.

The default is 200 milliseconds and should work for most vehicles.