Case study

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.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 1
Last commit: 2026-06-23
Language: Python
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code and documentation observed; no download method or demo found.
Checked: 2026-11-08

How evidence classes are assigned

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.

Cite

BibTeX

@misc{jacuzzi-jb1hl-protocol-case,
  title = {{Jacuzzi JB1HL: decoding the J185 panel-link bus}},
  howpublished = {\url{https://github.com/brunoamui/jacuzzi-jb1hl-protocol}},
  url = {https://github.com/brunoamui/jacuzzi-jb1hl-protocol},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/jacuzzi-jb1hl-protocol-case/}}
}

Plain text

Jacuzzi JB1HL: decoding the J185 panel-link bus. https://github.com/brunoamui/jacuzzi-jb1hl-protocol (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/jacuzzi-jb1hl-protocol-case/

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Primary sources

README.md GitHub · brunoamui/jacuzzi-jb1hl-protocol · Revision 2fbe217
docs/protocol.md GitHub · brunoamui/jacuzzi-jb1hl-protocol · Revision 2fbe217