Excuse me, After using the function of silent reading the card in the test of reading card, The anti-latent function is not considered it’s a valid reading card operation. Whether you can do some adjustment, use silent read card function card controller judgment is an effective reading card after operation, but no control relay, is the use of silent reading card can rise to prevent himself back function, but the relay can't open the door, in order to indirectly realize anti-pass back function of multiple controllers).

Hello, FC-8900 control board has the zone defense function, you don’t need to modify.