When a sensor indicates that someone may have broken into a house, the sensor transmits an identifying serial number to the main control unit, which sounds the alarm.
2.
An on-chip 32-bit Fujitsu FR microcontroller ( 6th generation in 2011 introduced the dual-core ARM architecture ) initiates and controls the operation and data transfers of all processors, modules and interfaces and can be seen as the main control unit of the camera.
3.
It may have its own internal control sequence unit, which is not to be confused with the CPU's main control unit, some registers, and other internal units such as an arithmetic logic unit ( ALU ) or a floating-point unit ( FPU ), or some smaller and more specific components.
4.
Later a small amount of exchanges were also manufactured by Plessey and GEC . It had a programmable common control called the Main Control Unit ( MCU ) and each exchange had at least three MCUs for security and a maximum of twenty, but in theory could operate with just one.
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