Bus coupler and sensor functions

Discussion in 'C-Bus Wired Hardware' started by sambo, Sep 20, 2023.

  1. sambo

    sambo

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    Hi, I have an old installation with 240v ultrasonic detectors triggering a relay to give a voltage free input to a bcn2b bus coupler. When you have two Cbus motion detectors controlling the same group they monitor the group so that if one detector has no motion and turns off the lighting group, the other detector ,if it still is seeing motion, will keep the lighting group on.
    Is it possible to replicate this with the bus couplers? Currently if one turns off and the other is on, that one doesn't resend an on command to keep the lights on, one has to cycle between off and on to turn lights back on.
     
    sambo, Sep 20, 2023
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  2. sambo

    Dasman

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    Are you performing the timing on the detector, or within the bus coupler?
     
    Dasman, Sep 20, 2023
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  3. sambo

    Ashley

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    That's exactly what the sensor is doing. In fact if you had continuous motion on one sensor and the other one turned off, the group would turn off and then instantly turn back on again. The sensor is effectively just a pir switch hooked up to a bus coupler.

    What are you controlling with the bus coupler? If it is an output unit, you can give each bus coupler input a different group then use the OR logic in the output unit to keep the output on if either input to the bus coupler is on.
     
    Ashley, Sep 20, 2023
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  4. sambo

    sambo

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    Currently timing is on the coupler
     
    sambo, Sep 20, 2023
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  5. sambo

    sambo

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    Motion detectors must have more smarts than a pir, there was an issue a good while ago where detectors controlling the same group would get into an on/off battle with each other and flood the network with their messages.

    Couplers are controlling a Dali group on Dali gateway.
     
    sambo, Sep 20, 2023
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  6. sambo

    Dasman

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    Assuming the bus couplers dont send on commands after its corresponding group is on, then a cheeky work around might be to use the corridor linking feature.

    Create a unique group for each sensor, and place that in the office group section, and then put the group address from the DALI gateway in the corridor section. Reduce the timer in your bus coupler by 1 minute.
     
    Dasman, Sep 20, 2023
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  7. sambo

    sambo

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    I like it, thanks for the suggestion I'll give that a go
     
    sambo, Sep 20, 2023
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  8. sambo

    oracle

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    Adjust sensor time down physically on the Ultrasonic to short time - Shorter than what you want sensor time to be and maybe even 20-30 secs.
    program the input into the bus coupler as a retrigger timer every sensor event will trigger the cbus group and restart the timer - set run on time in the bus coupler and set run on time in the sensors all to there setting.
    the last trigger On with that C-Bus group will take over the timing.

    to prove - set LED on sensors to show group state -
    trigger ultraonic -led on cbus sensor on but not flashing indicating that it is not the timer
    now trigger sensor it should start flashing showing it is timing.
    now go trigger ultrasonic and check the timer flash has stopped in the sensor
    if so you have solved your problem.
    if not,
    make a new group in the bus couplers and add that to the desired relay channel logic tab, tick the or box
    save relay and you are done, either the cbus sensors or the buscouplers will hold the channel on and both have to be off to turn load off.
     
    oracle, Sep 21, 2023
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