TCS Pune

UART loopback test

Guided diagnostic

UART loopback test

Verify transmit and receive paths with a controlled loopback.

Medium riskUART-capable boards and USB-UART adapters

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 · Local loopback

Method: Disconnect target, link adapter TX to RX and send known text

Expected: Exact text returns

⚠ Never loop RS-232 voltage into MCU UART.

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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