Hi, is in the current version of the LCN binding the possibility to send commands in PCK- format?
The Version 1 of the binding provided e.g. this:
[openHABcmd:myhome:PCK.0.5.MWT9]
But i can’t find he same in the current version.
No, that’s not supported anymore since all commands (except for the obsolete LCN-MRS) should be available as native OH commands. Do you miss anything?
Alternatively, you can program the command on an LCN key via LCN-PRO and virtually push this button with the hit key Action in OH.
Hello Fabian, thank you for your answer. I want send the command MWTx and i have no idea to do that. Can you please point me.
This command is automatically sent, when you link for example the variable#9 Channel. Or what is your use case?
I’m controlling a valve (3-way mixer?) for an underfloor heating. with th PID-Controller. The temperature- sensor after the valve is part of the LCN-bus. It’s a little bit tricky as it is a really big temperature fluctuation on the input side and a slow rate of tracking from the valve. E.g. the water temperature is changing from 36°C to 70°C in 180s and the valve needs in the worst case 130s from completely open to close.
On the other side and this is the reason for my question, if the target temperature reached with a small delta, from this delta occurs a permanet change of the PID-Controller-Out. The Output is slowly driffting (I-part). This is correct. I get problematic states, if in this case the current temperaturevalue (input from the PID-Controller) for a longer time interval is not updated. In combination with big temperatur fluctuation on input it’s not so nice.
After some investigation i found the following. It’s good to see in the picture above.
Interval 1: delta T = 0,2K, 70seconds
Interval 2: delta T = 0,8K, 152seconds
My thought: I poll the temperature value cyclic with the command MWTx and force the population in the LCN-bus, so the binding get a new value and my item is updated more frequently.
You can increase the update rate of LCN variables with LCN-PRO:
This is visible with “Administrator” access in LCN-PRO.
1 Like
@fwolter perfect
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