Intruder/burglar alarm system is a set of interconnected devices that is aimed to protect an object, usually a facility, against intruders and to notify the owner or/and the monitoring station/center of any violation of the protected zones. Depending on the requirements and financial possibilities, it can be a simple alarm system suitable for a basic protection of a home/apartment, or a more advanced structure, which in addition to the basic functions will greatly improve the life comforts of the users. The designer of the system, usually the installation company or simply the installer, can greatly help the investor/user (customer) to choose an optimal solution, depending on the characteristics of the facility and the customer needs, also taking into account expansion options for the future. More advanced alarm systems can perform functions like access control (motorized gates, electric strikes in wickets/doors), lighting and heating control, and many other tasks of home/building automation. The interface devices (manipulators) are modern keypads and touch panels, which beyond the aesthetic appearance and intuitive operation have the ability to store maps of the facility on memory cards for easier control of the entire system, as well as (optionally) mobile phones or handhelds and PCs with dedicated applications and Internet connection.