Practical Modbus calculators.
Decode a frame, prove a register value, translate an address, or assemble an RTU request. Everything runs locally in the browser; nothing is uploaded.
Modbus frame decoder
Paste an RTU or TCP frame and inspect its transport, Unit ID, function, address fields, data, exception, and CRC.
Modbus value decoder
Turn raw register bytes into signed and unsigned integers, float32, or float64 with explicit byte and word order.
Modbus address calculator
Translate between documentation notation and the zero-based PDU address carried in the request.
Modbus RTU frame builder
Build common read and write requests and calculate the Modbus CRC locally in your browser.
Take the same bytes into a live workbench.
Busloom keeps raw TX/RX frames next to decoded values, named sources, trends, alarms, recordings, and repeatable tests. These tools solve one question; the desktop app keeps the complete device story.
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