TCS Pune

COM-port problems

Guided diagnostic

COM-port problems

Diagnose missing, busy, denied or changing serial ports.

Medium riskAll serial development boards

Tools checklist

  • Digital multimeternUSB data cablenCurrent-limited bench supplynLogic analyser or oscilloscope when indicated

Symptom-to-checkpoint workflow

Start at checkpoint 1. Record the reading, then choose Pass or Fail to follow the correct branch.

Checkpoint 1 · Correct port

Method: Unplug board, note list, reconnect and select the new port

Expected: One stable port is identified

⚠ Close Serial Monitor before uploads.

Record this diagnostic run

Log in to save measurements and submit this run to an instructor.

Bench safety

Disconnect power before wiring changes or continuity testing. Confirm polarity and voltage limits. Use a current-limited supply for suspected shorts.

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