Modbus
What this tool does
CRC-16 for an RTU frame, and IEEE 754 float byte-order decode. 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 RTU CRC and float order when this is the job: CRC-16 for an RTU frame, and IEEE 754 float byte-order decode. 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 RTU CRC and float order from the tool list.
- Fill Frame hex (no CRC), Float hex, Float byte order 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
- Frame hex (no CRC)
- The frame bytes before the check bytes, as hex. Spaces are allowed.
- Float hex
- The four wire bytes of a 32-bit value, as hex.
- Float byte order
- How those four bytes are arranged compared with the controller.
Results
- Result
- The reported value for Modbus RTU CRC and float order. 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 RTU CRC and float order 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.
- Modbus Application Protocol / Modbus over Serial Line (CRC-16)
- IEEE 754 binary32
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.