# Fujitsu FGL Type A Bus Protocol: decoding an air-conditioner wired remote

> Fujitsu FGL Type A Bus Protocol reconstructs BWR wired-remote messages of an older Fujitsu/General air conditioner from logic-analyzer captures. Its specification records 500-baud 8E1 framing, heartbeat and command frames, and temperature and fan encoding; Python tools decode stored captures or sniff the bus live.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/thaserge-primary/AC-fujitsu-General-EZ-0001HSEFR-integration>
- Primary source: <https://github.com/thaserge-primary/AC-fujitsu-General-EZ-0001HSEFR-integration/blob/b71b543c54eb024358a99c1300fa7467dd175d21/README.md>
- Catalog page: <https://awesomerea.org/resources/fujitsu-fgl-type-a-bus-case/>
- Record JSON: <https://awesomerea.org/resources/fujitsu-fgl-type-a-bus-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/fujitsu-fgl-type-a-bus-case/index.md)

## Requirements & limits

- **Prerequisites:** The documented capture setup uses a USB logic analyzer, a voltage divider and sigrok-cli.
- **Scope:** Confirmed hardware is an AOG36TPAFL system with an EZ-0001HSEFR wired remote.
- **Limits:** ESP32 sniffer, injector and smart-home integrations are planned.
- **License:** MIT license.

## Primary sources

1. <https://github.com/thaserge-primary/AC-fujitsu-General-EZ-0001HSEFR-integration/blob/b71b543c54eb024358a99c1300fa7467dd175d21/README.md>
2. <https://github.com/thaserge-primary/AC-fujitsu-General-EZ-0001HSEFR-integration/blob/b71b543c54eb024358a99c1300fa7467dd175d21/docs/PROTOCOL_SPEC.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.