US Patent 10453279 Credential updates in an offline system

A method according to one embodiment includes receiving, by an access control device, access control data from a server, storing the received access control data to a no tour database stored in a memory of the access control device, determining a credential device has been presented to a credential reader associated with the access control device, and transmitting the stored access control data to the credential device in response to determining the credential device has been presented to the credential reader and prior to communication with the server.