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Mitsubishi Heavy Industries Superlink to MQTT Project for Cloudless home automation

• for the use with units supporting the use of the Rc-Ex Controllers

MQTT as an open source option that will easily integrate with HomeAssistant (Hassio)

Key notes / Findings :

• 2 wire XY Bus operating at +17v (+14v reported in some documentation)
• Super Link uses MHI’s own protocol, inc collision detection (CSMA/CD) system
• SL (Superlink) operates at 9600 bps, SL2 (Superlink 2) at 38400 bps both with a RS-485 interface

Resources: https://www.mhi.co.jp/technology/review/pdf/e452/e452006.pdf https://www.intesishome.com/docs/IntesisHome_MH-RC-WIFI-1_Compatibility_List.pdf https://www.home-assistant.io/integrations/climate.mqtt/

About myself: I work as an Automotive Installer, With limited programming knowledge I Hoping to find others interested in this project that with their added knowledge can help to get a working example that doesn't rely on expensive cloud based solutions offered on the market.