Whether for private homes or contemporary office buildings, door closer systems from Innovision Building Safety & Security are intelligent, integrated access solutions that combine consistency, convenience, design and premium quality. The wide-ranging product portfolio satisfies a broad spectrum of functional requirements and thus offers solutions for almost any individual door situation. The term door security may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions. Door security is used in commercial and government buildings, as well as in residential settings. The Door Control Unit is responsible for controlling and monitoring various electronic accessories in a vehicle's door. Since most of the vehicles have more than one door, generally DCUs are present in each door separately. A DCU associated with the driver's door has some additional functionalities. This additional features are the result of complex functions like locking, driver door switch pad, child lock switches, etc., which are associated with the driver's door. In most of the cases driver door module acts as a master and others act as slaves in communication protocols.