# Jacuzzi JB1HL: decoding the J185 panel-link bus

> Jacuzzi JB1HL Panel-Link Protocol documents the RS-485 messages between a Jacuzzi J185 hot tub's topside panel and I/O board. It identifies 38400 8N1 framing, a 34-byte poll-response burst, command bits and a checksum, then supplies an offline decoder and an ESPHome monitor for water temperature and pump or heater state.

- 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/brunoamui/jacuzzi-jb1hl-protocol>
- Primary source: <https://github.com/brunoamui/jacuzzi-jb1hl-protocol/blob/2fbe217cf74388300ef1c1e5448aa9373bc60fff/README.md>
- Catalog page: <https://awesomerea.org/resources/jacuzzi-jb1hl-protocol-case/>
- Record JSON: <https://awesomerea.org/resources/jacuzzi-jb1hl-protocol-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/jacuzzi-jb1hl-protocol-case/index.md)

## Requirements & limits

- **Prerequisites:** Monitoring requires an ESP32 with ESPHome, a TTL-to-RS-485 transceiver and access to the panel-controller A/B pair.
- **Limits:** The implementation monitors the bus read-only; transmit control is not implemented.
- **License:** MIT License.

## Primary sources

1. <https://github.com/brunoamui/jacuzzi-jb1hl-protocol/blob/2fbe217cf74388300ef1c1e5448aa9373bc60fff/README.md>
2. <https://github.com/brunoamui/jacuzzi-jb1hl-protocol/blob/2fbe217cf74388300ef1c1e5448aa9373bc60fff/docs/protocol.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.