Unkown error

[TonKro]

I connected the DTSU666 with a RS485 serial port on my pi. When add a integration I choose the serial port. But whatever I try I keep getting the message UNKOWN error.

Can anyone help me?

[scruysberghs]

can't help, but am seeing the same thing. Probably the modbus library changes in the home assistant versions since 202502

[TonKro]

Are there maybe other solutions to make it visible in home assistant? Or maybe by node-red or iobroker?

[scruysberghs]

I have used chatgpt to quickly generate a home assistant package yaml file starting from the pdf documentation with all the modbus registers that is in the docs folder of this repo.

modbus:
  - name: dtsu666
    type: serial
    method: rtu
    port: /dev/ttyUSB0
    baudrate: 9600
    stopbits: 1
    bytesize: 8
    parity: N
    timeout: 1
    delay: 1
    message_wait_milliseconds: 100

    sensors:
      - name: "DTSU666 Voltage L1"
        slave: 11
        address: 0x2006
        input_type: holding
        data_type: float32
        scale: 0.1
        precision: 1
        unit_of_measurement: "V"

      - name: "DTSU666 Current L1"
        slave: 11
        address: 0x200C
        input_type: holding
        data_type: float32
        scale: 0.001
        precision: 3
        unit_of_measurement: "A"

      - name: "DTSU666 Active Power Total"
        slave: 11
        address: 0x2012
        input_type: holding
        data_type: float32
        precision: 0
        unit_of_measurement: "W"

      - name: "DTSU666 Reactive Power Total"
        slave: 11
        address: 0x201A
        input_type: holding
        data_type: float32
        precision: 0
        unit_of_measurement: "var"

      - name: "DTSU666 Power Factor"
        slave: 11
        address: 0x202A
        input_type: holding
        data_type: float32
        scale: 0.001
        precision: 3

      - name: "DTSU666 Frequency"
        slave: 11
        address: 0x2044
        input_type: holding
        data_type: float32
        scale: 0.01
        precision: 2
        unit_of_measurement: "Hz"

      - name: "DTSU666 Import Energy"
        slave: 11
        address: 0x401E
        input_type: holding
        data_type: float32
        precision: 1
        unit_of_measurement: "kWh"

      - name: "DTSU666 Export Energy"
        slave: 11
        address: 0x4028
        input_type: holding
        data_type: float32
        precision: 1
        unit_of_measurement: "kWh"

output is this:

[TonKro]

Great looks very good. I will integrate it like this.

Are you known connect the DSU666 3 phase with three different Deye inverters?

[scruysberghs]

Great looks very good. I will integrate it like this.

Are you known connect the DSU666 3 phase with three different Deye inverters?

yep

[TonKro]

In my setup with 3x deye somehow I cannot get it work stable to control it via Home Assistant. I use the Chint DTSU666 3 phase.

Can you help me with the correct settings in the Deye about the settings of each Deye inverter?

• Each Deye I have set Parallel + Master (according the manual)
• Deye 1 Modbus SN 01 / Deye 2 Modbus SN 02 / Deye 3 Modbus SN 03
• Deye 1 Phase A / - Deye 2 Phase B / Deye 3 Phase C
• Ex_Meter For CT Only active for number 1 and checked A/B/C

On Deye 1

• RS485 is connected from the batteries
• RS485 from the DTSU485

When make a change in Deye 1 it looks like these settings are also processed on the others.

I do have doubts on the settings especially the master / slave settings.

Hope you can help me.