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This configuration has two doors to control, one of which is marked as secondary entrance unit. This unit is different from the main entrance unit in that it contains no screen or numpad for entering a PIN code.

 

In this layout, the user must first enter a building by showing their library card to the secondary reader. This will cause the system to verify the existence of the patron and that the patron is allowed access to the library, but not validate a PIN code. If the validation passes, a first door or set of doors is opened. Typically this would be an entry to a building that possibly has more functions than just a library - a community center for example.

After this first (which is slightly confusingly called secondary because from the system point of view, it is a lesser entrance unit) entrance, there is a proper, full entrance unit with display and PIN entry panel, which the user must again use.

The main entrance unit is different from a single unit system! It has a small computer inside. This changes the installation slightly, in that the unit does not have a direct connection to the main controller, only LAN. The main entrance unit must also have a power source installed somewhere. It is possible to take the power as a direct cable from the main controller just like for a single unit configuration.