The CTV900A is the core of the Centaur access control system and allows the management of up to 2048 doors. The server, readers, expansion modules as well as all inputs and outputs are connected directly to the CTV900A. Systems with multiple controllers are connected into one by the RS-485 communication bus. The integrated software architecture of the database allows each controller to make decisions in a fraction of a second. So professionals choose the CTV900A: fast, robust and remarkably stable. New SQL Server 2008 R2 Database Engine Compatible with Windows 10 Some minor adjustments and improvements