

Modbus RTU Tutorial | Find Slave Addresses, Test Registers & Control with Crestron
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#Crestron #Modbus #AVIntegration #RTU #QModMaster This tutorial shows how to debug and test a device that communicates over the Modbus RTU protocol. We’ll start by identifying the slave address of a Modbus device using the Modbus RTU Address Scanner tool, then test it with QModMaster, and finally show how to integrate and control it directly from a Crestron SIMPL Windows program. ✅ Key Steps Covered • How to find your device’s slave address on an RS-485 line • Testing registers with QModMaster (read & write examples) • Understanding Modbus request/response frames • How to send Modbus commands from Crestron SIMPL Windows • Correct wiring between Crestron RS-485 ports and the Modbus device 🛠Tools & Downloads • Modbus RTU Address Scanner (GitHub): https://github.com/oniointeractive/modbus-rtu-address-scanner • QModMaster (SourceForge): https://sourceforge.net/projects/qmodmaster/ • Fix for PL2303TA USB-to-RS485 adapters on Windows 11+: https://www.youtube.com/watch?v=r43rOgappBg • Learn more about Modbus commands (article with examples): https://ipc2u.com/articles/knowledge-base/modbus-rtu-made-simple-with-detailed-descriptions-and-examples/ 🛒 Explore our Crestron Drivers & Store https://oniointeractive.lemonsqueezy.com/ 📣 Stay Connected • Subscribe for more tutorials: http://bit.ly/38tA10M • GitHub: http://bit.ly/3LTi22a • ONIO Interactive on LinkedIn: http://bit.ly/3DV12WK • Connect with me on LinkedIn: http://bit.ly/3urylgI 👉 Support my work https://buymeacoffee.com/oniointeractive Your support helps us create more drivers, modules, and tutorials for the AV and automation community. Chapters 0:00 — Introduction & What We’ll Cover 0:21 — Hardware Setup (RS-485 adapters & wiring) 1:14 — Finding Slave Address with Modbus RTU Scanner 2:41 — Testing Registers in QModMaster 5:41 — Connecting Crestron RS-485 to Modbus Device 5:55 — Sending Commands in Crestron Environment 7:47 — Wrap-Up
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