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+--- Thread: Modbus Double datapoint type (/showthread.php?tid=1507)
Modbus Double datapoint type - josep - 30.07.2018
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.
RE: Modbus Double datapoint type - admin - 31.07.2018
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?
RE: Modbus Double datapoint type - josep - 31.07.2018
(31.07.2018, 06:58)admin Wrote: 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
RE: Modbus Double datapoint type - admin - 31.07.2018
Install through System Config > Packages and reboot:
https://dl.openrb.com/pkg/genohm-scada-modbus_20180731_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.
RE: Modbus Double datapoint type - josep - 31.07.2018
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
RE: Modbus Double datapoint type - admin - 01.08.2018
Set bus_datatype to either float32 or float16 and set value_multiplier to 0.1
RE: Modbus Double datapoint type - Ibrahim - 18.11.2020
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.
RE: Modbus Double datapoint type - admin - 18.11.2020
Use float for bus data type, double is not supported as an object data type but modbus can read double values
RE: Modbus Double datapoint type - Ibrahim - 20.11.2020
Thanks admin.