The Wiegand is the general communication protocol widely used in access controls to connect the device with device e.g. Reader with Access Control Panel as the data signals are communicated between the devices. It has become the defacto protocol for communication & most of the readers are with this protocol to make communication easy and universal.
The original patent of Wiegand was first awarded by United States Patent & Trademark office in 1974 on June 25, 1974 for its inventor John Richard Wiegand. Wiegand effect, named owing to its Inventor, a German scientist John Richard Wiegand. The Wiegand effect is the non linear magnetic effect produced in specially hardened and annealed (heat treated)
Anti pass-back Where the turnstile provides a return signal to the Access Control System to signal that user A has entered or exited the building. If user A then passes his proximity card to user B the access control system will know that this entry is potentially fraudulent and prevent access/egress. Anti-piggybacking Where methods have