You will need one M5Stack ATOM RS485 K045 Kit:
https://www.digikey.com/en/products/detail/m5stack-technology-co-ltd/K045/14318599
https://www.mouser.com/ProductDetail/M5Stack/K045?qs=81r%252BiQLm7BQ2ho0A5VkoNw%3D%3D
And one cable:
https://www.digikey.com/en/products/detail/assmann-wsw-components/AT-S-26-6-4-S-7-OE/1972674
https://www.mouser.com/ProductDetail/Bel/BC-64SS007F?qs=wnTfsH77Xs4cyAAV7TLsUQ%3D%3D
Or any other similar RJ11/12 cable as long as it is 6P/6C or 6P/4C - we only need 4 wires for this but the 6 wire version is fine too.
You can also use many other ESP32 development boards with the required RS485 converter - this is just an easy pre-wired setup that only requires you to cut, strip, attach 3 wires to the screw terminal, no soldering.
6P4C RJ11/RJ12 male connector end view
+---------+
1 --- |
2 --- +--+
Red B 3 --- |
Green A 4 --- |
Yellow GND 6 --- +--+
6 --- |
+---------+
Tankless Water Heater
Heat Pump Water Heater
Electric Water Heater
Protocol Documentation
Example commands to change a heat pump water heater settings here: https://github.com/stockmopar/esphome-econet/blob/main/m5atom-rs485-econet.yaml
Addresses
Commands
- READ_COMMAND (30)
- ACK (6)
- WRITE_COMMAND (31)
Object Strings
| String | Units | Gas Tankless | Heat Pump | Electric | Values |
|---|---|---|---|---|---|
| WHTRENAB | Y | Y | 1,0 | ||
| WHTRSETP | Y | Y | |||
| WHTRMODE | Y | ||||
| WHTRCNFG | Y | 0,1,2,3,4 | |||
| FLOWRATE | Y | ||||
| TEMP_OUT | Y | ||||
| TEMP__IN | Y | ||||
| WTR_USED | Y | ||||
| WTR_BTUS | Y | ||||
| IGNCYCLS | Y | ||||
| BURNTIME | Y |
Credits:
https://github.com/syssi/esphome-solax-x1-mini
https://github.com/glmnet/esphome_devices
Donate:
https://www.paypal.com/donate/?hosted_button_id=NKVWX2AJRLDT2