Signalling for flip-flop - SmartRelay 3 system

Signalling from the reader in the SREL3 ADV system does not indicate whether the door is open or closed in flip-flop mode. Even so, users can see whether the door is open or closed. To do so, the relay output is also used to help activate the power supply for signalling. If an electric strike opens when electric current is applied, for example, the power supply is activated by the relay. The same (activated) power supply can be also used for any signalling system, such an LED or light bulb.

It is even possible to signal an actuator (electric strike) closing when an electric current is applied. In doing so, use is made of the fact that the relay in the controller features both an NC and an NO contact. The positive terminal on the power supply for the electric strike is connected to the common contact; the positive terminal for the actuator is connected to the NC contact. The signalling positive terminal is connected to the NO contact. If the relay switches, the actuator on the NC contact is now longer supplied with power and the door opens. The NO contact closes at the same time and supplies power to the signalling.