biometric time clock
biometric time clock and the usual RS485 main line entrance guard system is different, the use of TCP/IP network communication mode, because the entrance guard system controller own TCP/IP communication port, can make full use of intelligent building, factory, residential area of the TCP/IP Ethernet network environment and realizing access management of the communication between host and controller, so construction, commissioning, wiring are very simple, and can minimize the destruction of the original building and reduce the engineering cost, repair and maintenance of the late also more convenient, so already more and more be adopted by the user.
The first generation of time and attendance systems As we all know, in the two years ago some brand notebook using fingerprint identification technology for the user login identity identification of the first generation of optical type fingerprint reader, but, when the launch of the fingerprint system belongs to the optical identification system, according to the present statement, should belong to the first generation of fingerprint identification technology. Optical fingerprint identification system is composed of light can penetrate the skin surface (deadly skin layer), so can only scan finger to the surface of the skin, or the scanning to the deadly skin layer, but not into the dermis. In this case, the surface of fingers clean degree, directly affect the identification effect. If the user fingers to stick a more dust, might show identification error situation. And, if people in accordance with the fingers, do a fingerprint fingerprint, may through the recognition system, for the user is concerned, use rise is not very safe and stable.biometric time clock host installation access management software, is responsible for the maintenance and management of the entrance guard system. System can also be another set a entrance guard system database server, also can use access management host holds concurrently do database server. System parameter setting, people in and out of records, alarm events and all staff's basic information, such as access records are stored in the database server, which can realize to the entrance guard system of centralized management, parameter setting, system maintenance, data query, all doors people in and out of statistical information, alarm events in notes, etc. Access management host, database server, branches of the entrance guard management extension, entrance guard controller are between the TCP/IP network connections. The entrance guard system can management 64 network group (branch), each group can network management 64 subnets host, the whole system can management of thousands of access point, can completely meet the large scale system management or system expansion needs.
The biometric time clock of capacitive sensor Then appeared the second generation of capacitive sensor, capacitance sensor technology is adopted the alternative command and arrangement, and sensor plate, alternate plate of the second generation of capacitive sensor form is two capacitance plate, and the fingerprint valley and ridge become board between dielectric. Between the dielectric constant of the sensor to test the change to generate the fingerprint image. But because of sensor surface is the use of silicon material damage easily lead to loss of life, and it is through the fingerprint ridges and valleys between the concave and convex to form the fingerprint image so to dirty fingers wet fingers finger such difficulties as low recognition rate.
