Access control system in the controller off how to solve
Offline is the controller and the computer communication is broken, if it is new, you check the connection, whether to connect with each other. Software settings
Communication between the controller and the management software: line failure; hardware failure; check the controller settings, communication accessories are good or bad to check the software failure; check the software settings and hardware settings.
Well, communication problems. The main inspection line (measured with a multimeter on the off state), the converter (if it is transmitted with 485) is damaged, the software I guess your settings if there is no change, it should not be a problem.
