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Gate management principles: 3.5 to 4.95 M by crystals of sinusoidal oscillation, dividing by the frequency divider is about 7.8 K sine wave, the triode power amplifier input after door plank with coil (7) large coil electromagnetic launch, by the gate 1-6 area to receive coil respectively. After receiving, the received signal are compared with those of the reference signal, found that after the change, change the acquisition card output level, the CPU in 300 milliseconds for 6 location data acquisition card scanned, determine the metal's location and output display
Access control is really a system enabling authorities to manipulate access to areas and resources in a very given physical facility or computer-based information system. Access control is, in fact, a common, everyday phenomenon. For example, a lock over a car door it's essentially a kind of access control. The PIN on the bank's ATM system is another type of access control. Even nightclub bouncers, standing in front of a door, are another example of (perhaps) an even more primitive mode of access control. Using an access control mechanism is essential when persons look to secure confidential, important, or sensitive information and equipment.
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