Dry Contact to Trigger an Open for a Device to Place a call

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I am trying to create a Dry contact via a ZWAVE device that can "Open" a connection and which is 2 wire connected to a IP Auto Dialer (see picture) so that the device when it detects an open, will auto dial a predetermined set of numbers and place calls and texts for my alarm system which is a Unifi Protect that is integrated via @Snell's drivers.

So, flow is this:

  1. Unifi Protect Motion Sensor detects motion during "armed" state
  2. Notification is posted in Hubitat
  3. Rule states that if "Sensor" detects motion, trigger a "ZWAVE" device (in this case the Zoon Zen51) to open the circuit
  4. IP Auto Dialer detects "OPEN" and executes outbound SMS and SIP call to designated numbers and plays/Texts announcement (Via IP connection from dialer to UDM PRO SE)

See the diagram for a visual

I am just trying to validate that I can get a device to open a 2 wire contact circuit to trigger this event in the IP Autodialer

Auto Dialer Diagram
Auto Dialer Diagram3015×1155 159 KB

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You absolutely can, however the challenge might be in a failure mode. For example when the zen51 loses power, that circuit will open and then trigger your dialer (assuming the dialer is on ups or battery power during a failure. It may be better to see if the dialer can support a normally open sensor, and close it to trigger the dial.

Curious which auto dialer are you using? Ones I’ve used in the past were normally open not normally closed; or they looked for 12v from the alarm panels siren circuit.

Also the only issue with the zen51 is that it is line voltage. You may want to consider the low voltage zen58 for this situation so you aren’t mixing line voltage with dry contacts in a single box. But that may be personal preference and or local code dependent. Also if you have low voltage there already for the dialer or other purposes it may fit better. YMMV.

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@darren.stp Thanks for the insight and feedback, I did move forward with the ZEN58 option as I could use a simple low voltage converter to power the device and drive the solution. I will post this solution once validated as an idea for others with a similar use to leverage. Thanks for the feedback.

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