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Each entrance requires a computer to run; on computer can only operate one entrance. Two doors can be controlled in one entrance, when one of them only has a songle barcode reader without a display or pinpad.

The main computer operates the entrance unit, runs the entrance software to instruct patron in entrance process and operates the IO for doors and lights. It also runs the master controller and library controller services, which handle SIP communications, scheduling of events, security camera picture storage and indexing and audio announcements.

The main computer has storage for security camera pictures. The SOL controller software automatically cleans this storage, removing pictures older than specified time, to keep the space available for new pictures.

The computer is the same as in any other Supa devices: Advantech UNO 2473G. It has a 32 GB mSata disk as the system disk, and unlike in other Supa devices an additional 480 GB SSD for camera image storage. The secondary disk is a regular ATA connected SSD which can be easily replaced if needed, for example should it ever fail or if more space is required.

The operating system is Windows 10 IoT LTSB Enterprise, 64 bit.

It is also possible to an entirely separate server for image storage. For this use, a Lenovo ThinkServer TS140 is available from Supa.