Modbus Double datapoint type

[josep]

Hello,

I'm trying to connect via Modbus RTU with Siemens Sentron 3100 and the energy value is defined as a Double, how can I define it into LM json archive, thank you very much.

[admin]

Hi, double support can be added to modbus plugin. I can provide packages if you are willing to test this. Which firmware and hardware versions are you using?

[josep]

Hi, double support can be added to modbus plugin. I can provide packages if you are willing to test this. Which firmware and hardware versions are you using?

Hi, 

I have a LM5Lp and the last firmware version (20170927). Thx

[admin]

Install through System Config > Packages and reboot:

https://dl.openrb.com/pkg/genohm-scada-m...1_imx6.ipk
https://dl.openrb.com/pkg/luamodbus_20180731_imx6.ipk

In profile you can either use float64 or double. Mapped object should have float32 data type.

[josep]

OK thank you very much

I have another doubt, I have modbus variables that are int32 variables of temperature or power values multiplied by 10, I have tried to use the option to adjust these values in the Modbus definition using 0.1 but I do not know what type of data I have to use in KNX to represent a 32-bit float value. The only option that I have found was to create a new variable and make an intermediate script that divides me by 10 the value read from Modbus. Thank you very much. a greeting

[admin]

Set bus_datatype to either float32 or float16 and set value_multiplier to 0.1

[Ibrahim]

Hello,

This is old post but I need to help about same issue. I can use double point in profile like below for double points and I selected 8 byte in objects to link this point but the value is getting too big.

"datatype": "double", "bus_datatype": "double", "type": "register",

   

If I select 4-byte floating point, it looks "-"

The logic machine version is : HW: LM5 Lite (i.MX6) , SW: 20191015

What is the correct point for double?

Thanks.

[admin]

Use float for bus data type, double is not supported as an object data type but modbus can read double values

[Ibrahim]

Thanks admin.