The Doorbird i/o controller allows control of up to 3 external relays. 12/24v 1A relays allow control of 3 separate door controls. Relays can be configured as either NO or NC.
The I/O controller also has 2 dry contact input relays for monitoring of sensors.
The I/O controller can be either connected and powered via POE or by the supplied PSU and encrypted WiFi on 2.4ghz. This means their is no actual wiring needed at the Intercom itself making the installation more secure and preventing tampering of the relays.
For more information and spec sheet click here