Hello, I am working on a node red project, and I want to read a voltage value. The problem is that the value I'm reading is a signed hexadecimal value, which doesn't give me the right voltage value. I would like to convert this signed hexadecimal value to a floating value. Can someone help me, p…

Are you reading these values via Modbus? Can you post an example of flow that you use?

I use parseInt function :slight_smile: [image]

Where do you get hex values from? Can you post full flow?

I use socketcan out to get the hex value and i converted it to decimal

Select the nodes which generate the issue and press export https://nodered.org/docs/user-guide/editor/workspace/import-export It is hard to understand the issue because it is possible to translate from hex to float. [{"id":"1628789d76bcc9ed","type":"inject","z":"6ce20a4e7446e62d","name":"","props…

I haven't worked with socketcan but you are probably receiving a buffer of hex. In this case you should use a converter: [image] node-red-contrib-buffer-parser Node-red nodes to convert values to and from buffer/array. Supports Big/Little Endian, BCD, byte swapping and much more …

I use node-red-contrib-buffer-parser for convert signed hexadecimal from PLC.

How do you use the parser buffer. I don't understand how it works ?

There are built in examples (use CTRL+I in node-red to access examples) There is also built in help (on the Node-red sidebar) and the readme is quite informative. Lastly, there are tonnes of working examples around the forum where it has solved the same problem you have.

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Problem to convert signed hexadecimal to float

General

David321 9 January 2023 14:07 5

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Problem to convert signed hexadecimal to float

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