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+--- Thread: Modbus profile problem (/showthread.php?tid=1849)
Modbus profile problem - permar - 20.01.2019
Hello!
I have created a modbus profile for my slave and it works great to reed the registers, however the slave only supports the function code "writemultipleregisters". I have added the "writatble": true in the profile but I get Illegal function in the log. It works fine if I do it in a script with mb:writemultipleregisters(47041, 2). Are there any way to get the modbusprofile to use the function writemultipleregisters??
Best Regards!
P
RE: Modbus profile problem - Erwin van der Zwart - 20.01.2019
Hi,
Have you try adding this field in the profile?
Code:
"write_multiple": true,Erwin
RE: Modbus profile problem - permar - 21.01.2019
Works great, thanks!
Best Regards!
P
RE: Modbus profile problem - permar - 25.01.2019
Now I have a new problem. I have the following in my profile:
{
"name": "Förskjutning värmekurva",
"bus_datatype": "int8",
"type": "register",
"address": 47011 ,
"datatype": "int16",
"value_multiplier": 1,
"writable": true,
"write_multiple": true,
"units": " K"
},
This works great as long as the value are positive, when the value is negative I allways get the value 127 on KNX side. Have tryed the word_swap funktion with all the alternatives without success. I think maby the wordswap is done after the conversion frpm int16 to int8 and therefore has no effect in this case...? I need to have a int8 on the KNX side beacause of the comunications object on the other KNX devices.
Any suggestions?
Best Regards!
P
RE: Modbus profile problem - admin - 25.01.2019
Only byte swap can affect single register value, word swap won't change anything. Can you try setting bus_datatype to int16 and assign a temporary object to see if negative values work correctly?