Ecosyste.ms: Awesome
An open API service indexing awesome lists of open source software.
https://github.com/jpmeijers/heatpump-monitor
Heat Pump talking XYE protocol
https://github.com/jpmeijers/heatpump-monitor
Last synced: 5 days ago
JSON representation
Heat Pump talking XYE protocol
- Host: GitHub
- URL: https://github.com/jpmeijers/heatpump-monitor
- Owner: jpmeijers
- License: gpl-3.0
- Created: 2023-04-20T06:35:25.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2024-08-11T13:05:28.000Z (5 months ago)
- Last Synced: 2024-08-11T14:26:29.740Z (5 months ago)
- Language: C++
- Size: 4.37 MB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Heat Pump Monitor
I have an Alliance Heat Pump with a wired control panel. Alliance seems to be rebranding Midea units.
After sniffing the communication lines with a logic analyzer, I saw that it's a differential pair, like RS485. The request and answer frames start with 0xAA and end with 0x55. Searching for this I stumbled upon: https://codeberg.org/xye/xye
My heat pump's format is however slightly different, but the basics helped to find the correct decoding formula for temperatures. A 24h dump of raw data with my attempt at decoding the frames can be found in [this LibreOffice spreadsheet](FullDayDataDecoded.ods).
I programmed an ESP32 to listen to the RS485 bus and log all frames to MQTT. The firmware is available in the firmware directly in the repository. I write the data to Influxdb and plot the values using Grafana.
## Wired Remote Control
Model KJR-26B or SUNI-W/H-002
## Wiring
|Code |Colour|Purpose |
|-----|------|---------------|
|AC10V|White |10Vac supply |
|AC10V|Red |10Vac supply |
|P |Brown |RS485 B- |
|Q |Black |RS485 A+ |
|E |Yellow|Earth/Ground/0V|
## Request/Command
|Byte Nr|Purpose |
|-------|------------------------------------------------------------------------------------|
|0x00 |Header. Always 0xAA. |
|0x01 |8 = schedule off, 0 = schedule on, 0x82 = ?? becomes this when status byte 4 is 0x88|
|0x02 |0xFF |
|0x03 |0x00 |
|0x04 |0x00 |
|0x05 |Tank Temp Setting |
|0x06 |Temp Diff Setting |
|0x07 |0x00 |
|0x08 |0=??, 1=?? - seen as 1 at start of schedule on |
|0x09 |0x00 |
|0x0A |0x00 |
|0x0B |0 = e-heat disabled, 0x01 = e-heat enabled |
|0x0C |0x00 |
|0x0D |0x00 |
|0x0E |0x00 |
|0x0F |0x00 |
|0x10 |0x00 |
|0x11 |0x00 |
|0x12 |0x00 |
|0x13 |0x28 |
|0x14 |0x00 |
|0x15 |0x00 |
|0x16 |0x00 |
|0x17 |0x00 |
|0x18 |0x00 |
|0x19 |0x00 |
|0x1A |0x00 |
|0x1B |0x00 |
|0x1C |0x00 |
|0x1D |0x00 |
|0x1E |Checksum = 256 - (sum(b1:b29)%256) |
|0x1F |0x55 |
## Response/Status
|Byte Nr|Purpose |
|-------|-----------------------------------------------------------------------------------------|
|0x00 |Header. Always 0xAA. |
|0x01 |0x01 |
|0x02 |0x00 |
|0x03 |0xFF |
|0x04 |0x08 = schedule off, 0x82 = schedule on, 0x88 = ?? after this command byte 1 becomes 0x82|
|0x05 |0x08 |
|0x06 |0x00 |
|0x07 |0x00 |
|0x08 |T1 = byte/2 - 0x0F = outlet water temperature |
|0x09 |0x00 = pump off, 0x64 = pump on (100%?) |
|0x0A |0x00 |
|0x0B |0x00 |
|0x0C |0x00 except 0x20 when byte 4 is 0x82 |
|0x0D |0x00 |
|0x0E |T3 = byte/2 - 0x0F = evaporator temperature |
|0x0F |0x00 |
|0x10 |Ia - pump amps? |
|0x11 |0x00 |
|0x12 |0x3C |
|0x13 |0x28 |
|0x14 |0x00 = pump off, 0x20,0x22,0x24 = pump on - related to current temp diff |
|0x15 |0x00 |
|0x16 |T5 = byte/2 - 0x0F = tank temperature |
|0x17 |T4 = byte/2 - 0x0F = environment temperature |
|0x18 |0x01 |
|0x19 |0x00 = pump off, 0x01 = pump on |
|0x1A |0x00 |
|0x1B |0x00 |
|0x1C |Tank Temp Setting - follows command byte 0x05 |
|0x1D |Command check = 0xFF - byte 0x01 |
|0x1E |Checksum = 256 - (sum(b0x01:b0x1D)%256) |
|0x1F |0x55 |
## Grafana
