time attendance clock to person's fingers end positive skin rough and uneven produce grain line. Grain line regular arrangement form different grain type. The starting point of the lines, the destination, the combining site and the branch point, called the details of the fingerprint feature point. Fingerprint recognition means that by comparing different details of the fingerprint feature point for identification. Because each person's fingerprints are different, the same person is between fingers, fingerprint also have obvious difference, so the fingerprint can be used for identification of identity. Fingerprint identification technology is the most mature and the price cheap biometric identification technology. At present, fingerprint identification technology are widely used, we not only in the entrance guard, attendance system can see the figure of fingerprint identification technology, on the market have more fingerprint recognition application: such as notebook computers, mobile phones, automotive, bank payments can apply fingerprint identification technology.

time and attendance systems is the centre of the entrance guard system, like as the human brain. The entrance guard controller performance directly affects the stability of the entrance guard system, and system stability directly affect the customer's life and property safety. At present the Chinese market access controller products is numerous, function little difference, but quality is uneven. Therefore for engineering business, product selection is particularly important. So how to choose high quality door controller? We through many years of practice experience and summed up the following share: Our principle is "stable and reliable performance, function and practical, price advantage, the sustainability of localization service ability".

A, prevent crash design The time and attendance systems halted like car engine flameout as. No matter the function of the controller design again strong, if a crash, the controller can't work at work, any function can reflect. If in the application of crash appeared, means the controller control area can't normal access, and may even cause serious security hidden danger and immeasurable loss.Second, the capacity of the relay The entrance guard controller output is by relay control. Controller work, relay to frequent movable, and every time when opening, there is a transient current through the. If relay capacity is too small, instantaneous current may exceed the capacity of the relay, and soon, damage to the relay. Generally relay capacity should be greater than electric lock peak current more than 3 times.The entrance guard system used to protect personnel and property safety, so the system itself must be safe. What say here high security, on the one hand, is refers to the products or system of the natural attribute of or quasi natural attribute, should ensure that equipment, system operation of the safety and the safety of operators, such as: equipment and the system itself to resistance to high temperature, low temperature, hot and humid, and can prevent electrostatic, anti-interference, etc.; On the other hand, entrance guard and security system should have the function of preventing the man-made destruction, such as: has tamper alarm, etc.

The meaning of time and attendance systems is very wide, generally can be divided into physical characteristics and behavior features two kinds. The body features include: fingerprints, vein, palm type, retina, iris, body odour, face, and even blood vessels, DNA, bones, etc.; Behavior characteristics, including: the signature, speech, walking gait, etc. Biological identification system, on the biological characteristics of sampling, extraction its unique characteristics into digital code, and further the these code composition feature template, when people with recognition system interaction for identity authentication, recognition system through the gain its characteristics and features in the database template matching, to determine whether the matching, thus decided to accept or reject person.

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