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+--- Thread: kWh modbus to KNX convertion? (/showthread.php?tid=4734)
kWh modbus to KNX convertion? - ClausP - 25.04.2023
Hello everyone.
I've been using this code to convert an int16 modbus to an float16 knx.
Code:
{
"address": 52,
"datatype": "int16",
"bus_datatype": "float16",
"name": "Total import kWh",
"value_multiplier": 0.1,
"type": "register"
},Then it stopped working.
I prosume that the problem is that i run out of data in the 16 bit signed integer.
Then I tried to change the datatype to int32 an the bus_datatype to 14 (4-byte floating point).
But still no succes.
Any sugestions on what to do to get the propper readout in KNX?
The last code I tried is copied from another modbus profile for a powermeter:
Code:
{
"address": 52,
"read_count":20,
"read_offset":2,
"datatype": "float32",
"bus_datatype": "14",
"name": "Total import kWh",
"value_multiplier": 0.1,
"type": "register"
},Link to modbus manual: https://gavazzi.se/app/uploads/2020/11/em330_em340_et330_et340_cp.pdf
RE: kWh modbus to KNX convertion? - admin - 25.04.2023
datatype must be set to int32. You might need use a different read_swap. Use Read test to find correct parameters.
RE: kWh modbus to KNX convertion? - ClausP - 25.04.2023
(25.04.2023, 08:05)admin Wrote: datatype must be set to int32. You might need use a different read_swap. Use Read test to find correct parameters.Can you specify the read test? How do I do that?
RE: kWh modbus to KNX convertion? - admin - 25.04.2023
Read test is in the Modbus tab / bottom toolbar.
RE: kWh modbus to KNX convertion? - ClausP - 25.04.2023
Okay, i've done the read test, and it has to be set as follows:
Read Swap: None (ABCD)
Datatype: int32
How do I specify the readswap in the .json file?
RE: kWh modbus to KNX convertion? - admin - 25.04.2023
Add "read_swap":"n" to your profile entry. It is all described here: https://openrb.com/docs/modbus.htm