Hallo, i want ask something. how to read temperature from thermocouple 4-20mA? i use modbus rtu protocol to this. output value from sensor in node red like the picture in bellow. how to fix it? thanks before guys [image]

Depends on which ADC (Analogue Digital Converter) card / method you are using to read the values. MCP3008, others. Are there direct Node-RED nodes. I use WidgetLords cards and have been very pleased (no affiliation) with direct support for Raspberry Pi and Node-RED. They have multiple 4-20 ma ca…

ukmoose 30 October 2019 08:18 2

Perhaps @Riky_maarif can help you as you both appear to be doing the same exercise with the same value How to read Value Sensor from Modbus RTU

Topic		Replies	Views
Reading type t thermocouple with mod bus General	4	150	18 March 2023
Node-red flow for temperature reading General	2	75	6 May 2025
Serial modus Communication error Temperature sensor with RS485 General	2	121	22 August 2024
How to convert my modbus data to Fahrenheit General	6	1111	6 April 2021
MODBUS RS485 Sensor read General modbus	2	442	1 February 2024

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

How to read temperature using thermocouple

Related topics