Modbus
What this tool does
Decode one register as 16-bit, or two registers as an IEEE 754 float, with word and byte swap. This page says what the tool is for, in plain language. The working formula stays on the signed-in tool.
When to use it
Open Modbus register decode when this is the job: Decode one register as 16-bit, or two registers as an IEEE 754 float, with word and byte swap. That is usually a capture from the wire, a register you cannot decode, or a frame you are about to send.
Step-by-step
- Open Modbus register decode from the tool list.
- Fill Width, Register hex, Byte swap, Word swap from the instrument, the drawing, or the job record. Use the unit shown beside each field.
- Run Calculate when that control is on the page, then read every result row and any warning.
- Check the result against the site procedure and the manufacturer data before you change a range, a wire, a setpoint, or a weight.
- This help page is public. Opening the tool still requires a Pro session.
Inputs
- Width
- Choose the Width that matches the instrument, the drawing, or the job. Choices include 16-bit register, 32-bit float.
- Register hex
- Wire order. Two bytes for 16-bit, four bytes for a float.
- Byte swap
- Choose the Byte swap that matches the instrument, the drawing, or the job. Choices include Off, On.
- Word swap
- 32-bit only. Exchanges the two registers.
Results
- Result
- The reported value for Modbus register decode. Use the unit printed on that row.
- Warnings
- A warning means an entry is incomplete or outside what this tool will stand behind. Recheck the inputs and the site procedure.
Common mistakes
- Pasting a frame that already includes the check bytes into a field that wants the frame without them.
- Using a holding-register reference where the frame wants the zero-based address.
- Assuming a 32-bit value is in the same word order the controller uses.
- Do not treat a result from Modbus register decode as a substitute for the site procedure or the manufacturer data.
Standards references
These are the standards and public references named on this tool. Clause numbers appear only when the catalog already cites them.
- IEEE 754 binary32
- Modbus Application Protocol (16-bit registers, paired for 32-bit values)
Offline and access
This engine can run offline after the server has cached it for the signed-in account.
A free session can read this help page. The tool card shows the name and the short summary. Opening the tool requires Pro.