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    pavel.cernocky

    @pavel.cernocky

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    Best posts made by pavel.cernocky

    • RE: 1-wire bus topology

      OK, thanks for the answer, now it makes more sense :-)
      The link you sent explains a lot. Maybe you could add it to your wiki.
      So the key point is, that your hub is replacing star topology with linear topology, which should be better for 1-wire network.

      posted in UniPi 1 - HW Q&A
      P
      pavel.cernocky

    Latest posts made by pavel.cernocky

    • Persist variable through restart

      Hi,
      is there way to persist some variables through neuron restarts (power outages)?
      There is a property "Write on change" on each variable, but I haven't found anything in doc and I'm not sure whether it could be useful.
      Thanks.

      posted in Mervis
      P
      pavel.cernocky
    • RE: Upload to Mervis DB not working

      @tomas_hora OK, I see, that makes sense.
      Thanks a lot for your support.

      posted in Mervis
      P
      pavel.cernocky
    • RE: Upload to Mervis DB not working

      @tomas_hora OK, I got it. I was only deploying solution, but didn't uploaded configuration. It's a bit misleading to have 2 "upload" options on two different places. What each of these actions exactly does?

      Now I can see my data on https://db.unipi.technology/viewer, but it's strange, that there are missing points from one or other thermometer, only rarely there are both values at one time.

      What can cause this behaviour?

      0_1496088378826_upload-f0279656-6d9c-4651-9bb7-c2bb2179f49d

      posted in Mervis
      P
      pavel.cernocky
    • RE: Upload to Mervis DB not working

      @tomas_hora Runtime identifier is also set, should it be set to something specific or should it match something?
      What about Trigger variable name in history properties, should it be filled? I haven't found any doc about this.
      I'll check the system status as soon as I'll reach the PLC.

      posted in Mervis
      P
      pavel.cernocky
    • Upload to Mervis DB not working

      I've set up History like this:
      0_1495609968289_upload-0d5e65d7-1d48-4bb9-9612-5c135a559c39

      And I have these variables in History:
      0_1495610581442_upload-e14182a9-8fed-46ef-83d7-107d6c9e3f3a

      MervisDB parameters:
      0_1495610208700_upload-850f9670-51b8-4d7d-950e-d95e0360de67

      If I debug the PLC I can see how the variables are stored in history. (Don't know why every 3 seconds, given that save period is one minute).

      But I can't see anything on https://db.unipi.technology/viewer.
      All I get is this message in bottom left:
      0_1495610301475_upload-1d8cf1eb-28f5-4d62-9a9a-4a6242e23b9b

      If I enter wrong credentials, then I get different message, so credentials should be ok.

      What I'm doing wrong?
      Also, is there any way to debug it on Neuron side? Eg. to see whether it is sending some data at all? I've tried "Download system log" in Mervis, but there is no mention about success or failure.

      Thank you.

      posted in Mervis
      P
      pavel.cernocky
    • RE: 1-wire extension module

      @tomas_hora OK, thanks for hints.

      posted in UniPi Extension Modules (Axon & Neuron)
      P
      pavel.cernocky
    • RE: 1-wire extension module

      What do you mean by "similar solution"?
      If it's not priority, what's preferred way to connect multiple thermometers to Neuron?
      Thank you.

      posted in UniPi Extension Modules (Axon & Neuron)
      P
      pavel.cernocky
    • 1-wire extension module

      Hi,
      will there be any 1-wire extension module for Neuron?
      I mean something like "8channel 1Wire" https://www.unipi.technology/cs/8channel-1wire-rozsireni-p47?categoryId=14
      Thanks,
      Pavel

      posted in UniPi Extension Modules (Axon & Neuron)
      P
      pavel.cernocky
    • RE: 1-wire bus topology

      OK, thanks for the answer, now it makes more sense :-)
      The link you sent explains a lot. Maybe you could add it to your wiki.
      So the key point is, that your hub is replacing star topology with linear topology, which should be better for 1-wire network.

      posted in UniPi 1 - HW Q&A
      P
      pavel.cernocky
    • RE: 1-wire bus topology

      Thanks for reply and clarification.

      1. I'll try it on one channel and I'll see
      2. The wiki states:

      ... we are not trying to connect as many 1Wire devices as possible but to have maximum reliability. To achieve this we are trying to minimize the length of DQ line between the end point and the 1Wire bus. So we are using not 1Wire but rather 2Wire topology.
      This means that at the end device you have to connect the DQ line to both 6 and 7 pins of the RJ45 connector in order not to split the topology.

      And that's what I don't understand.. How do you minimize the length of DQ line with 2-wire topology, how does the topology look like? What's the point of connecting booth pins 6 and 7 to DQ?

      1. Thanks for clarification
      posted in UniPi 1 - HW Q&A
      P
      pavel.cernocky