samsung-modbus-mim-b19n

Example python script to for testing reading and writing data to a Samsung Heat Pump or HVAC unit using a MIM-B19N Modbus module, purchase from Midsummer

Tested with:

• AE050RXYDEG-EU Gen6 ASHP
• Raspberry Pi with USB Modbus reader
• Python 3

Install python module

$ pip3 install minimalmodbus

Run with

$ python3 samsung-modbus.py

Example output

Central heating status: 0
Target indoor temp: 21.0
Indoor temp: 22.7
Target flow temp: 25.0
Flow temp: 32.7
Return temp: 33.6
DHW status: 1
DHW target temp: 55.0
DHW temp: 49.8
Away mode status: 0

Control commands

Write / controll comands can be activated by un-commenting them.

Next setps

• DONE: Integrated this into a EmonHub interfacer module to log the data to MQTT and Emoncms
• Home Assistant integration? (can anyone help with this?)
• NodeRED module? (can anyone help with this?)

More Resources

More info on Samsung communication protocols including the NASA protocol which is used for communication between indoor and outdoor units can be found here: https://wiki.myehs.eu/wiki/Main_Page