Data acquisition card with digital input/output function and data acquisition device employing data acquisition card

Abstract

The invention provides a data acquisition card with a digital input / output function and a data acquisition device employing the data acquisition card. The data acquisition device comprises a setting unit used for receiving logic level standards; the data acquisition card comprises a control unit used for generating logic level signals, receiving logic level signals, and controlling an adjustable voltage power supply to generate first and second adjustable voltage according to the logic level standards, an output circuit used for converting the logic level signals into output signals, an input circuit used for converting input signals into logic level signals, a fixed voltage power supply used for generating first constant voltage for supplying electricity to the control unit, and the adjustable voltage power supply used for generating the first adjustable voltage and the second adjustable voltage for supplying electricity to the output circuit and the input circuit. The data acquisition card can work under different logic level standards and meets application requirements of digital logic levels in different types, so that the data acquisition card is higher in applicability and wider in application range.

Description

technical field [0001] The invention relates to the technical field of test and measurement, in particular to a data acquisition card with digital input and output functions and a data acquisition device thereof. Background technique [0002] Data acquisition devices are widely used in communication, medical, industrial automation and other fields. The data acquisition device is a device that automatically collects and measures data information from the measured object. It can collect and measure various signals such as DC voltage signal, AC voltage signal, DC current signal, AC current signal, frequency signal, temperature signal, pressure signal, and pressure signal. The data acquisition device has pluggable module cards, also called sub-cards. Module cards with different functions meet the needs of building measurement systems for different applications, and the flexible configuration mode is also convenient for users. [0003] Such as figure 1 As shown, it is a schema...

AI Technical Summary

Problems solved by technology

[0008] For the data acquisition card of the prior art, because the power supply of each unit adopts the same constant power supply, for example, only with a single 5V voltage supply, so the signal interface that can be realized, the input signal of its access or the output signal of the output are only Can be a digital logic level, such as TTL level

For the rich digital logic levels now, the occasions where this single logic level can be applied are very limited.

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