> ## Documentation Index
> Fetch the complete documentation index at: https://docs.prescaler.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Serial monitor

> Observe application output over a selected serial port.

Observe application output over a selected serial port.

## Before you start

A serial-capable device, correct port and baud rate.

## Workflow

Select the intended port, set the framing/baud options offered by the monitor, and connect. Capture a bounded interval around the event you are investigating. Keep timestamps and configuration with exported output.

## Interpret the result

Serial output does not establish chip identity or debug-probe availability. Firmware logging can change timing; missing output may be a baud, wiring or firmware problem.

For an unexplained result, preserve the source/configuration and observation together. Use [Diagnose a failure](/workflows/diagnose) to turn it into a reproducible investigation. Check [support boundaries](/reference/limitations) before assuming a vendor-specific operation is implemented.