The program registers entering and leaving visitors and writes the data into the database. Writing data takes place via a selected time interval (5, 10, 15, 20, 30 or 60 minutes). The program must run constantly until the store is opened. Data on visitors are presented in a chart. You can connect up to 8 passageways to a single computer, using a hub or extender of COM ports. The distance from the computer to the counter is up to 60 meters.