Three-in-one USB data acquisition card

Abstract

The invention relates to a three-in-one USB data acquisition card belonging to the field of data processing and comprising an analogue-digital conversion circuit. The three-in-one USB data acquisition card is characterized by being provided with a microcontroller control circuit with a first USB interface, an operating mode transfer switch, a USB primary / peripheral controller control circuit and a second USB interface, wherein the microcontroller control circuit is connected with the analogue-digital conversion circuit and the USB primary / periphery controller control circuit through a general CPU bus; the USB primary / periphery controller control circuit is correspondingly connected with the second USB interface; and the microcontroller control circuit decides the working mode of a data acquisition card according to the amplitude of a level signal input by a moving contact of the operating mode transfer switch. Beside the conventional functions of acquisition, conversion and output of data, the invention can directly store large capacity of data content to an externally-connected movable storage, thereby greatly enlarging and developing the application range of the data acquisition card; thus, the invention can be widely applied to the fields of industrial process control and industrial process monitoring.

Description

technical field [0001] The invention belongs to the field of electrical digital data processing, and in particular relates to a data acquisition device. Background technique [0002] Data acquisition refers to the automatic collection of non-electrical or electrical signals from analog and / or digital units under test such as sensors and other equipment to be tested, and sends them to the host computer for analysis and processing. [0003] The data acquisition system is a flexible and user-defined measurement system combined with measurement software and hardware products based on computers or other special test platforms. [0004] Usually, the sensor signal must be modulated before the data acquisition equipment collects it, including gain or attenuation and isolation, amplification, filtering, etc. For some types of sensors, an excitation signal also needs to be provided. [0005] Data acquisition card, that is, a computer expansion card that realizes data acquisition func...

AI Technical Summary

Problems solved by technology

[0010] Therefore, the existing data acquisition cards need to be used in conjunction with a computer, and cannot work independently, and cannot directly store large-capacity data content to an external removable memory

[0011] On the other hand, the existing data acquisition cards only have the function of data acquisition / transformation, but not the function of controlling other devices, which makes their application range very limited and cannot meet the needs of the rapidly developing automatic control system / The needs of the field, can not meet the requirements of some specific control / application occasions

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