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What is it used for?
Dry contacts are voltage-free contacts also known as Digital or Alarm contacts/inputs/outputs. Vutlan provides dry contact input and output ports. Inputs allow us to receive signals. Outputs allow sending signals. In terms of programming, this is essentially 1 or 0, On or Off, Signal or no signal.
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Dry contact usage examples:
General Alarm
System Healthy status
System Common Fault Alarm
Door open/closed
A window opened/closed
HVAC on/off state
Power supply control (controls On/Off state of any connected devices)