Read Power Meter EASTRON SDM72D-M via Modbus - need Help

Add-ons Bindings
1

Hi,

I am already reading data from my Huawei Inverter via Modbus rtu (thanks to this turorial: Reading data from Huawei inverter SUN 2000 (3KTL-10KTL) via modbus RTU)

Now I added a new power meter (EASTRON SDM72D-M) to this Bus. I gave it slave id 2.
The Modbus registers of the power meter are documened here: https://stromzähler.eu/media/pdf/6d/02/af/SDM72DM-manual.pdf

I added these lines to my existing BridgeModbus.things file:

Bridge modbus:serial:slave200 [ port="/dev/ttyUSB0" ,id=2 , baud=9600, stopBits="1", parity="none", dataBits=8, encoding="rtu" ]{

Bridge poller slave201input [ start=30073, length=8, refresh=10000, type="input" ]{
        Thing data Import_kWh                 [ readStart="30073", readValueType="float32" ]
        Thing data Export_kWh                  [ readStart="30075", readValueType="float32" ]
   }

Bridge poller slave202input [ start=31281, length=8, refresh=10000, type="input" ]{
        Thing data Import_W                 [ readStart="31281", readValueType="float32" ]
        Thing data Export_W                 [ readStart="31283", readValueType="float32" ]
   }

and added this to my items file:

Number  Import_kWh      "Stromzähler Import [%.1f kWh]"           <energy>          (gSolar)      { channel="modbus:data:slave200:slave201input:Import_kWh:number" }
Number  Export_kWh      "Stromzähler Export [%.1f kWh]"           <energy>          (gSolar)      { channel="modbus:data:slave200:slave201input:Export_kWh:number" }
Number  Import_W        "Stromzähler Momentan Import [%.1f W]"    <energy>          (gSolar)      { channel="modbus:data:slave200:slave202input:Import_W:number" }
Number  Export_W        "Stromzähler Momentan Export [%.1f W]"    <energy>          (gSolar)      { channel="modbus:data:slave200:slave202input:Export_W:number" }

But openhab doesnt get the values. The 4 items have the value 0. At the PaperUI the created things are online.
Can anyone help? Thank you!

Best regards
Robbelt

2

Ok…I got it working by myself.
Modbus is not very intuitive :wink:

I had to change the things file to:

Bridge modbus:serial:slave200 [ port="/dev/ttyUSB0" ,id=2 , baud=9600, stopBits="1", parity="none", dataBits=8, encoding="rtu" ]{

Bridge poller slave201input [ start=72, length=4, refresh=10000, type="input" ]{
    
        Thing data Import_kWh                 [ readStart="72", readValueType="float32" ]
        Thing data Export_kWh                 [ readStart="74", readValueType="float32" ]
   }

Bridge poller slave202input [ start=1280, length=4, refresh=10000, type="input" ]{
    
        Thing data Import_W                 [ readStart="1280", readValueType="float32" ]
        Thing data Export_W                 [ readStart="1282", readValueType="float32" ]
   }
1 Like
3

Hi @robbelt can you share which modbus - opehnab interface do you use? Asking because I want to have same EASTRON SDM72D-M modbus integration