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Phidget USB Has No COM Port

Machine SetupReviewed 2026-06-27

Summary

Phidget USB setups do not use a COM port in Rostoc. Rostoc talks to the Phidget USB device directly, so check the Phidgets driver or control panel instead.

Steps

  1. Connect the Phidget interface and probes by USB.
  2. Install the Phidgets OS package/driver if needed.
  3. Confirm the Phidgets Control Panel or driver can see the device.
  4. In Rostoc, choose the Phidget machine/module entry. There is no COM port to choose for Phidget USB.
  5. Check that probes are connected to the expected channels.
  6. If no Phidget appears at all, the roaster may be the version sold with the maker's own controller rather than a Phidget board. Mill City Roasters, Diedrich, and VNT models are in the catalog both ways; choose the non-Phidget entry.
  7. If a serial number is saved in the machine settings, it must be the 5-6 digit serial on the device label, not the four-digit model number on the board. Leave it blank to use whichever Phidget is attached.

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