MODBUS to MQTT

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Got a MODBUS device that you want to publish its data to the cloud?  Use the JNIOR and the MODBUS to MQTT application.

MODBUS is a protocol that many legacy systems use.  MQTT is new and works very well to publish data to any MQTT broker whether in the cloud or hosted locally.  The JNIOR can fill the gap and get that older equipment’s data from the equipment to where you need it for analysis.

Set up the MQTT broker

There are several free brokers that you can use to test with.  You can find that list here: https://github.com/mqtt/mqtt.github.io/wiki/public_brokers

Define your slaves and the tags

If your slave is RS485 then you will need to use the model 410 and set up the serial settings to match your device.

Once your setup is complete you will the the data update on the MODBUS to MQTT page.  A message will be sent around the message pump the the MQTT application to publish the data.  The data will be sent to the topic as follows with spaces in the slave name or data tag simply removed.

This application is still a work in progress so please register to leave a comment below!

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This post was written by Kevin Cloutier

March 4, 2019 11:17 am