MBus and Siemens UH50 meter - Printable Version

MBus and Siemens UH50 meter - Printable Version

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MBus and Siemens UH50 meter - tomnord - 23.02.2024

I have 3 UH50 heatmeters that is battery operated. They only update data each 15min. What is the correct way to set up LM as GW for these devices?
I use a MBus to RS232 gateway.

RE: MBus and Siemens UH50 meter - admin - 23.02.2024

Use a scheduled script. Check this guide: https://kb.logicmachine.net/integration/mbus/

RE: MBus and Siemens UH50 meter - tomnord - 26.02.2024

That's probably right, but when the meter only sends each 15mn, it is in sleep mode the remaining time. It's turning into quite a challange to sync LM and meter.

RE: MBus and Siemens UH50 meter - admin - 26.02.2024

M-Bus provides both data and power over two-wire connection. This means that the M-Bus module is permanently powered even though the meter itself uses battery power. You can probably read the data at any time but it won't be real-time measurements.

RE: MBus and Siemens UH50 meter - tomnord - 26.02.2024

None of the meters are responding to adress scans eighter.. It was based on that I thought that values only was available every 15min.

RE: MBus and Siemens UH50 meter - admin - 26.02.2024

Have you configured short address on each meter? M-Bus module might use a different baud rate like 1200 or 4800.

RE: MBus and Siemens UH50 meter - tomnord - 26.02.2024

yes, i think so.. strange.. I also have the secondary adresses of the meters, but how does the mbus.scansecondary function work?

i only get this error;

Code:
attempt to call field 'scansecondary' (a nil value)

stack traceback:

RE: MBus and Siemens UH50 meter - admin - 26.02.2024

You have outdated firmware.

RE: MBus and Siemens UH50 meter - tomnord - 26.02.2024

Code:
SW: 20230607

RE: MBus and Siemens UH50 meter - admin - 26.02.2024

Install 2024 RC1.

RE: MBus and Siemens UH50 meter - BrentW - 18.04.2024

(26.02.2024, 12:45)tomnord Wrote:
Code:
SW: 20230607

Hi Tomnord,

Any update on how you went with this integration?
We are also integrating with the UH50 using Mbus and the meters do have some peculiar behaviours.

Brent

RE: MBus and Siemens UH50 meter - tomnord - 24.04.2024

(18.04.2024, 11:40)BrentW Wrote:
(26.02.2024, 12:45)tomnord Wrote:
Code:
SW: 20230607

Hi Tomnord,

Any update on how you went with this integration?
We are also integrating with the UH50 using Mbus and the meters do have some peculiar behaviours.

Brent

I got it to work, had some issues with cables. All values ar updatet each 15min, but previous value is stored in mBus buffer.
Script below with separated GA's.

Code:
-- config init

if not meters then

  require('mbus')

  -- time to wait between each meter read

  sleeptime = 10

  -- use /dev/RS232 serial port with 2400 baud rate

  mbus.init('/dev/RS232', 2400)

  -- meter definition

  -- addr - short address

  -- id - number from data table where value resides

  -- div - optional divisor for convertion to the final value

  meters = {

    { ga = '3/0/0', addr = 10, id = 4, div = 10}, --  kW, dpt 14.

    { ga = '3/0/1', addr = 10, id = 2}, --  kWh dpt 12.

    { ga = '3/0/2', addr = 10, id = 5, div = 1000 }, --  m3h dpt 14

    { ga = '3/0/3', addr = 10, id = 6 }, --T1    dpt 12.

    { ga = '3/0/4', addr = 10, id = 7 }, -- T2   dpt 12.

    { ga = '3/1/0', addr = 20, id = 4, div = 10 }, --  kW

    { ga = '3/1/1', addr = 20, id = 2}, --  kWh

    { ga = '3/1/2', addr = 20, id = 5, div = 1000 }, --m3h

    { ga = '3/1/3', addr = 20, id = 6 }, --T1    

    { ga = '3/1/4', addr = 20, id = 7 }, --T2   

    { ga = '3/2/0', addr = 30, id = 4, div = 10 }, --kW

    { ga = '3/2/1', addr = 30, id = 2}, --kWh

    { ga = '3/2/2', addr = 30, id = 5, div = 1000 }, --m3h

    { ga = '3/2/3', addr = 30, id = 6 }, --T1    

    { ga = '3/2/4', addr = 30, id = 7 }, --T2     

  }

  -- reset meter values on first run

  for _, meter in ipairs(meters) do

    meter.value = 0

  end

end

-- read each meter

for _, meter in ipairs(meters) do

  res = mbus.getdata(meter.addr)

  -- read ok

  if type(res) == 'table' then

    data = res.data[ meter.id ]

    value = nil

    -- get current value

    if type(data) == 'table' then

      value = tonumber(data.value)

    end

    -- value is valid and different from previous read

    if value and meter.value ~= value then

      -- apply divisor if set

      div = meter.div

      dpt = div and dt.float32 or dt.uint32

      if div then

        value = value / div

      end

      -- update group address value

      grp.update(meter.ga, value, dpt)

      meter.value = value

      --log(meter.ga, meter.value, dpt)

    end

  end

  -- wait for next read

  os.sleep(sleeptime)

end

RE: MBus and Siemens UH50 meter - BrentW - 01.05.2024

Thanks for sending through,

What were the cable issues if you dont mind me asking?

RE: MBus and Siemens UH50 meter - tomnord - 13.05.2024

(01.05.2024, 09:28)BrentW Wrote: Thanks for sending through,

What were the cable issues if you dont mind me asking?

There was a fault on the Mbus/RS232 gateway.