Kamstrup Multical 602 Heat Meter Modbus Template

[Gavin Harper]

I am just trying to get my head around creating a Modbus template for these heat meters.
I don't suppose anyone has done this already?

Any tips or pointers, trying to decipher the data sheet and enter the information. :)

Wish me luck,

Gavin

[Tico]

It looks like that device is Modbus RTU. To connect to that you would need a Loxone Modbus Extension.

https://shop.loxone.com/enen/modbus-extension.html

The Miniserver has the capability to connect to Modbus TCP devices in it's default state over a LAN. Just confirm if you've got the necessary hardware?

[Gavin Harper]

Hey there. I haven't got the hardware yet but plan to get it to read several heat meters.. it is just that there isn't a standard template so I am trying to work out how to create one from the data sheet.

The thing I'm struggling to get to grips with is the units.

[Tico]

I'm looking at the 'Data model mapping for word-addressed region' (Page 5) -

http://www.multical.hu/MODBUS_datasheet.pdf

If I understand correctly, the data sheet proposes a 16bit word that will have a value of either 1, 2, 17, etc. that equates to kW, MW, kWh etc. The 'Units' parameter in the attached .loxone file should output a decimal value (ie. a value 17 would equal kWh).

It looks like you have a choice of either polling the float values or polling the integer values, then applying the decimal value and the unit value to get the final parameter. These values could be combined in a State Block to achieve the final value.

It's a bit hard to tell how the decimal value and unit value are applied until you get values coming from the sensors.