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Using the Serial Monitor for Help & Testing

Most LCC Fusion firmware sketches support a small set of serial commands for on-bench testing and quick help. This works over:

• USB Serial (Arduino Serial Monitor, YAT, etc.)
• WebSerial
• Bluetooth Serial (where enabled)

Connecting

1. Power the Node/Card and connect the ESP32 to your computer via USB.
2. Open a serial terminal (Arduino Serial Monitor, YAT, etc.).
3. Select the correct COM port and set baud rate to 115200.
4. Press Reset on the ESP32 if needed to see the startup banner.

You can now type commands into the serial window and press Enter.

Core serial commands

Important:
The exact output of each command depends on the card and firmware that is loaded. Always start with ? to see what’s available for that card.

I – Installation Help

The I command is designed as a quick on-bench reference:

• Summarizes where and how to plug the card into the Node Bus or Node Card.
• Calls out power requirements and typical supply ranges.
• Notes key jumpers / configuration selectors that must be set before use.
• May include a brief reminder of what the card actually does (inputs, outputs, etc.).

This lets you get basic installation guidance without having the full web docs open.

T – Test / Self-test

The T command typically:

• Runs one or more self-tests (I²C, CAN, I/O strobes, etc.).
• Prints a short summary indicating pass/fail conditions.
• Is safe to run on the bench with only power and a serial connection.

Refer to each card’s Testing section in its Assembly/Install Guide for the expected behavior of T.

P – Pin / PCB Information

The P command is used where available to:

• Print a list of test pins / PST pins.
• Show how the firmware maps ESP32 GPIOs to connectors.
• Help you correlate silkscreen labels with firmware pin names.

Use this when you’re probing a board with a meter or scope, or when writing custom test procedures.

3. Per-card documentation snippet for I

Then, in each Card Assembly / Install Guide, you only need a small, reusable snippet.

For example, near the Testing section (Node Card, BOD Card, etc.):

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Tip – Installation Help from the Card Itself

Once this card’s firmware is running and you have a serial monitor connected at 115200 baud, type I and press Enter. The firmware will print a short, card-specific installation summary (power connection, jumpers, and key connectors) directly in the serial window.

For more details on using serial commands (?, T, P, I), see
Using the Serial Monitor for Help & Testing.