https://blanpa.github.io/tags/modbus/Recent content in Modbus on blanpaHugo -- gohugo.ioen© 2026 blanpaSat, 11 Jul 2026 00:00:00 +0000https://blanpa.github.io/blog/modbus-node-red/Sat, 11 Jul 2026 00:00:00 +0000https://blanpa.github.io/blog/modbus-node-red/<p>I&rsquo;ve written about <a href="https://blanpa.github.io/blog/siemens-s7-opcua-node-red/" >OPC-UA</a>, <a href="https://blanpa.github.io/blog/allen-bradley-ethernet-ip-node-red/" >EtherNet/IP</a>, and <a href="https://blanpa.github.io/blog/mqtt-vs-sparkplug-vs-nats-vs-opcua/" >a whole zoo of modern protocols</a>. But if I had to bet on which protocol you&rsquo;ll actually encounter most often on a real shop floor, my money is on the oldest one in the room: <strong>Modbus</strong>. Designed by Modicon in 1979, it&rsquo;s on power meters, VFDs, temperature controllers, flow meters, HVAC gear, and ten thousand other devices. It&rsquo;s gloriously simple, slightly maddening, and absolutely everywhere. Here&rsquo;s how to talk to it from Node-RED.</p>