Intercoms with serial connection type

Serial

— a serial connection is characterized by the fact that surveillance cameras can only be connected to the head unit, to which the call panels are also connected. Additional intercoms cannot work with "own" equipment, they, in fact, only duplicate the main unit; such intercoms are connected in a serial "chain", hence the name. The advantage of serial systems is the availability of all equipment from any of the intercoms, the disadvantage is the inability to connect more devices than the main unit allows.