Universal data converter and method for Wiegand bus

Abstract

The invention belongs to the technical field of electronics, and particularly relates to a universal data converter and a universal data conversion method for a Wiegand bus. The universal data converter comprises an AND gate circuit, a single-chip microcomputer and a serial port circuit. When data is input, one of D0 / D1 is a negative pulse, and is output through an AND gate to cause the external interrupt of the single-chip microcomputer, and after the single-chip microcomputer reads the data of P1.0 and performs corresponding data processing, the data is output through RS232 / 485 to realize the conversion of a Wiegand data signal into ordinary serial data. A serial communication data format which is the most commonly used in engineering is used for data recording, and an RS232 / 485 field bus is used for identifier data transmission, so that identifier data identification universality, long transmission distance and identification mode intellectualization are achieved.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a universal data converter and method for Wiegand bus. Background technique [0002] In the field of identification, IC cards, ID cards, fingerprint heads, palm prints, iris and other identification methods are usually used to convert and store data through various collection devices, and transmit data in the form of an ID number, regardless of the above Which kind of identification carrier will finally output data through a method called Wiegand bus; Wiegand bus is not a general international standard, but because most manufacturers follow such a transmission mode, it has been recognized by the industry and complied with , and various control devices can only adapt to it. The Wiegand bus is defined as figure 1 Shown: The bus is defined as a two-wire format, marked with D0\D1 respectively. When there is no data, the two lines are high level. When there is data ou...

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Problems solved by technology

[0003] At present, in order to adapt to the products of different manufacturers, the control equipment needs to customize different wiring modes, and the Wiegand signal output by the recognizer adopts TTL level, the data transmission distance is extremely short, and the control equipment needs to be connected nearby, which brings great inconvenience to engineering practice

[0004] Since the Wiegand bus is not an international standard or a national standard, and there is no corresponding identification module or integrated circuit produced, it is only a data transmission method followed by some equipment in some enterprises, especially the front-end identification equipment. If the enterprise equipment is to be matched with it, it must be adapted to it, and the existing control equipment meets the technical requirements of the front-end recognizer without limitation. For the recognizer used in the product, it is necessary to design its own controller data port, which brings certain limitations to the actual user's selection of the identifier, and the installation of the product is also restricted

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