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PanelTemp output over Modbus


Jules Oct 29, 2020 10:08 PM

Forgive me if this is a very basic question but I'm quite new to modbus programming. I am using the sample code provided here: https://www.campbellsci.ca/blog/access-live-measurement-data-using-modbus to return the panel temperature as a modbus excercise. As the article states, my CR1000X is returning a 32-bit unsigned integer split across two 16-bit registers, returning for example: 16789, 224. My question is: how do I convert this into a useable decimal number? Documentation for PanelTemp says it returns the value in degrees C, so I'm not sure what I'm doing wrong. Thank you.


JDavis Oct 30, 2020 10:46 AM

It is actually mapping the value to a 32-bit floating point number, without byte reversal. If you select the correct data type in whichever Modbus software you are using, the value should display correctly.

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