Recording and Replaying

The CLI is the easiest way to generate "Golden Master" files for your digital twin simulations.

Creating a Recording

The record command opens an interactive SCPI shell. Every command you send and every response received is recorded into a JSON file.

instrumation record "GPIB0::7::INSTR" DMM production_dmm.json

Interactive Commands

Inside the recording shell, you can: 1. Send SCPI: Type *IDN? or MEAS:VOLT:DC?. 2. Wait: Use wait 1.0 to simulate a delay. 3. Finish: Type quit or exit to save and close.

Replaying the Session

Once you have a .json file, you can "measure" against it as if it were a real instrument:

instrumation measure "replay://production_dmm.json" DMM measure_voltage

This is extremely useful for: - Offline Development: Writing your Python scripts at home. - Regression Testing: Ensuring your code still works correctly with "real" data from the lab. - Deterministic CI: Running tests in GitHub Actions without physical hardware.