This is a 5-zone microcontrolled security system designed to meet British Standards specification BS4737.

This intruder Alarm Control Panel system is based on the Motorola EP520M security microcontroller. The EP520M is a robust device having its origins at the heart of an automobile engine management system – a hostile environment for any microcontroller to work in. Now masked as an alarm controller, the device operates in high electrical noise and RFI environments, displaying a high degree of immunity to such hazards.

These devices are used in control panels throughout the UK and Europe, and are reputed to be completely reliable and free from false alarming. The EP520M’s extensive features include four detection zones, with one programmable as an Entry-Exit Delay zone, plus a 24-hour monitor for anti-tamper devices and Panic Attack (PA) use. Normally-closed (NC) and normally-open (NO) detectors can be used on all zones.