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Software Engineer Reverse-Engineered His HVAC Thermostat Using RS-485 and AI

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A senior software engineer with minimal hardware experience set out to integrate his Delta Controls eZNT-T331 thermostat into his home automation setup after finding no API, app, or technical documentation available. The thermostat, part of a centralized multi-zone HVAC system, communicated over a serial RS-485 bus with a central controller but offered no way for the homeowner to interact with it remotely. Replacing the unit was not a viable option, as it would have required involving professional integrators and reworking the entire system interface. Instead, the engineer chose to reverse-engineer the device's industrial communication protocol by studying its menus and monitoring the live bus traffic. He credits AI assistance as essential to the project's success, saying without it the effort would have stalled at the very first hardware obstacle.

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