The system consists of a switch box with 6 indicator lights; green= unlocked and red= locked. The system is powered by a 24 volt dc power supply. Evolv has a PLC that interfaces via cat 5.
When someone goes through the scanner and sets it off, the contacts in the PLC close momentarily thus initiating the latching relay to latch closed, changing the indicator light to red, and sending 24 volts to a relay installed on the turnstile which is normally closed to open, thus dropping out the solenoid and locking the turnstile.
It also activates a buzzer and light to indicate turnstile locked. Once the guard is satisfied, he then pushes the unlock switch thus closing the contacts and energizing the lock solenoid to unlock the turnstile.
Switch 3 through 6 locks and unlocks the various gates and doors connected to the system. Communication of the switch box to controller is made through a 24 wire harness attaching both units. The whole system is powered by 110v ac and has a battery backup for emergency power.