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Nexwell (NEXO System) – no communication between the control unit and the lighting modules

janek78 4135 13
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How can I get Nexwell RGB lighting modules to communicate with the control unit when they are addressed correctly but are not detected on the bus?

The problem was the bus wiring, not the module addressing: the bus should have very low resistance, and in this case moving lines A and B onto different twisted pairs fixed communication. Check continuity from the bus card/galvanic isolator by disconnecting the bus at the splitter, shorting A and B, and measuring the cable resistance with an ohmmeter [#10976261][#10979522] A reading of about 730 ohms was far too high; it should be around 5 ohms in a typical house, and using another pair in the FTP 4x2x0.5 cable was suggested if the original pair was damaged [#10981687][#10982673] After swapping both A and B to different pairs, the resistance dropped to 9 ohms and the system started working normally [#10986948]
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  • #1 10975843
    janek78
    Level 9  
    Posts: 7
    Rate: 1
    Hello,

    I’ve had a Nexwell at home for two years. I’m currently in the process of expanding the system. I’ve bought a few RGB lighting modules with a dimmer for the first floor (because the ones downstairs are really cool :-) ). I’ve connected them to the upstairs distribution board, but they won’t communicate. I read in the manual that they need to be addressed on the bus. I think I’ve set the addresses correctly, but they won’t be detected by the system at all. Perhaps you’ve had a similar problem? All the LEDs are flashing fine and manual circuit switching works.

    Regards
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  • #2 10976261
    LukasINST
    Level 2  
    Posts: 3
    In Nexwell, ensuring the correct continuity of the cables is very important. I have already installed four Nexwell units, and the first thing to check is the continuity of the wires. Presumably, as per Nexwell’s support, your bus cable is FTP 4x2x0.5. Disconnect the bus from the main distribution board at the splitter, short-circuit lines A and B, and check the cable’s resistance with an ohmmeter.
  • #3 10977833
    janek78
    Level 9  
    Posts: 7
    Rate: 1
    From the separator?????
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  • #4 10979522
    LukasINST
    Level 2  
    Posts: 3
    Well, from the bus card (that is, the galvanic isolator) :-)

    Cheers
  • #5 10980471
    mikroflota
    Level 12  
    Posts: 64
    Rate: 3
    Be sure to discuss the upgrade with the Nexwell technicians. Check and provide the model numbers of all your devices. Make sure to tell them the date you bought the motherboard. The RGB design is almost certainly newer than your system version.
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  • #6 10981687
    janek78
    Level 9  
    Posts: 7
    Rate: 1
    OK, I've got about 730 ohms
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  • #7 10982673
    LukasINST
    Level 2  
    Posts: 3
    Well, you should be getting around 5 ohms, not nearly 1k (if the house isn’t very big). Perhaps someone damaged the cable during the building work. Use another pair in the twisted pair cable as the bus and see how it goes. Line B is the most important. That’s just from my experience. :D
  • #8 10983462
    janek78
    Level 9  
    Posts: 7
    Rate: 1
    OK, it's 9 ohms!

    Moderated By Akrzy74:

    Question about the installation, nexwell- What?!

    It is forbidden to post messages describing a problem without providing sufficient information to enable other forum users to offer a substantive response. The post title should include the make, model and a brief description of the fault.

    Please correct the title in your first post!

  • #9 10986948
    janek78
    Level 9  
    Posts: 7
    Rate: 1
    I did a bit of tinkering on Sunday. I swapped the wires on both lines A and B to different pairs. It’s working a treat :)

    Added after 1 [minute]:

    mikroflota wrote:
    Be sure to discuss the upgrade with Nexwell technicians. Check and provide the versions of all devices. Draw their attention to the date of purchase of the bus card. The RGB project is almost certainly newer than your system version.


    When purchasing the modules, I consulted Nexwell’s technical department. We carried out the update via the system’s LAN card and the LCD panel. I bought a new bus card for the second network. Thanks anyway

    Do you perhaps have any experience with hardware programming?
  • #10 10988126
    mikroflota
    Level 12  
    Posts: 64
    Rate: 3
    janek78 wrote:


    Do any of you have experience with hardware programming?


    I do.
  • #11 11024372
    janek78
    Level 9  
    Posts: 7
    Rate: 1
    [quote="mikroflota"]
    janek78 wrote:


    I have it.



    Have you ever programmed a Nexwell IR module? I’m wondering whether to
    get one?
  • #12 11024977
    mikroflota
    Level 12  
    Posts: 64
    Rate: 3
    I've done the programming. It's simple, you can get the hang of it in 5 minutes.

    Here are the instructions

    The only difficulty is that there’s no preview of the libraries with added signatures... so you need to make a note of it somewhere.

    P.S. Please change the thread title.
  • #13 11043271
    janek78
    Level 9  
    Posts: 7
    Rate: 1
    mikroflota wrote:
    I've done the programming. It's simple, you can get the hang of it in 5 minutes.

    Here are the instructions

    The only difficulty is that there’s no preview of the libraries added to the signatures... and you have to make a note of it somewhere.

    P.S. Please edit the thread title.


    How should I modify it? Changing the topic title won’t work either, because my previous question ‘won’t fit’. Perhaps it would be better to create a new topic.
    Sorry for asking, but I’m new to using the forum.
  • #14 11072165
    mikroflota
    Level 12  
    Posts: 64
    Rate: 3
    janek78 wrote:
    How should I change it? Changing the subject line won’t work either, because my previous question “won’t fit”.


    I think you can edit the first post and change the subject there. A suitable subject would be, for example:
    Nexwell (NEXO System) – system expansion [RGB+IR]
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