Ist es normal, dass er bei Things unter dem Modbus garnichts anzeigt?
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how can it be that I have wonderful data in the web interface but not in the iOS app. It’s also strange that it does display the German translations in iOS but not on the web interface.
Can someone tell me where to change something?
Hi, just used this great tutorial to integrate the E3DC in openhab. It is working flawlessly.
i have one question: how can you set switches? currently everything is just reading. how does writing Modbus states work? I want to trigger “Ladesperre” for example using openhab automation.
This is not going to be straightforward.
First thing you need to find out is if the device (about which I know nothing) will actually let you switch this from modbus?
If so, how? There is no rule that modbus status and control have to in the same register or even register type.
If we assume the likely case for now, reading and writing from the same modbus register, we run into a snag.
This group of device status are represented as single bits in a 16-bit register. (that the 84.0 part, bit 0 in register 84)
It is not possible for modbus binding to write a single bit in a register.
The closest you can do is write the whole register with that one bit set as you wish.
That would not be too difficult - but the hard part is what about the other bits? Presumably you need to remember what they are and write the register with all of the important bits set the way they last were, except the one you want to change.
That can be done with some coding, but I won’t go into it unless needed. Find out how your E3DC expects modbus writing to happen.
The general idea for bits-in-register writing is here
@mal , based on your excellent work integrating the E3DC system: I will get a Stiebel Eltron heatpump installed, including its Internet Service Gateway (ISG), supporting Modbus TCP/IP. What do I need to do to use the Openhab Modbus Binding to communicate with the heatpump? Ideally, I like to control the heatpump via Openhab, using excess solar energy, as reported by the E3DC Modbus connection.
Thanks a lot for your advice.
@ffr the magic happens in step 3 of the tutorial. You need to get the modbus documentation for your Stiebel Eltron pump. Accordng to the documentation you can then create the things.
I can’t tell if the heatpump can be controlled via modbus, though the Modbus Binding is capable of that (didn’t try it).
You might want to consider using the E3DC SG ready interface board. Newer heatpumps should have SG ready implemented.
@bjoernbrings We need to have a binding for that. I’m diving into RSCP currently (.NET not Java yet). It’s not that complicated, but last time I worked on a binding, the build environment was a real PITA.
What the RSCP binding needs:
synchronous tcp websocket communication (send telegram and wait for reply telegram)
encrypt the telegrams with Rijndael256 (block and key size 256 bit) using Bouncy Castle
and of course the protocol fiddling
The communication and polling part can be found in other bindings already. I didn’t check if a bindings uses Bouncy Castle already. The protocol handling / telegram interpretation is time consuming IMO.
I just reinstalled Openhab, maybe I find the time to work on this in the next months.
Meanwhile someone else might build something around this python implementation. It talks JSON on first glance.
Thanks for the quick response. I know about the SG ready interface. My understanding is that it requires a serial connection between the E3DC and the heatpump. It is also not as flexible as an Openhab rulset.
Maybe this git project is helpful, I didn’t do the coding. But in my point of view with my limited experience in coding it will be a solid base to start a binding, because the hard work RSCP is already done. I tested the sample file on my own E3Dc and it is working fine.
The RSCPTag file looks quite interesting as it lists all the TAGs but without any further info. But it shows that the author has deeper insights beyond the documentation that is open to anyone by E3DC.
Our E3DC device requires username and password for RCSP (that is modbus I think?) Currently I am using it with a python script since there is a library for it, but integrating it directly would be better…
So where do I need to put username and password?
I have read all responses now so RCSP is able to control the device and modbus works without authentication but cant control it?
NVM, I found it now, seems to be new in the device since I never saw that option