Data baud rate adaptive digital-analogue conversion device

Abstract

The invention discloses a data baud rate adaptive digital-analogue conversion device. The data baud rate adaptive digital-analogue conversion device comprises a plurality of parallel transceivers, a data isolator, a complex programmable logic device (CPLD) data processing module and a plurality of parallel digital to analog converters, wherein the plurality of parallel transceivers correspondingly receive a plurality of nonstandard RS 485 differential signals with different baud rates, and then convert the differential signals into transistor-transistor logic (TTL) signals; the data isolator isolates the TTL signals and then outputs the TTL signals; the CPLD data processing module performs synchronization and data decoding on the different baud rates of the isolated TTL signals; and the plurality of parallel digital to analog converters perform analogue conversion on the decoded data. The data baud rate adaptive digital-analogue conversion device solves the problems of sampling and decoding identification of the plurality of nonstandard RS 485 differential signals with the different baud rates and enlarges an input range of the signals by taking the CPLD data processing module as a core. By using a parallel processing structure of the CPLD data processing module, and channels of input signals are convenient to extend; the real-time efficiency of data processing is improved; and the conversion of multi-channel digital signals to analog signals is further realized by matching the plurality of parallel digital to analog converters. The data baud rate adaptive digital-analogue conversion device has the advantages of high adaptability, high integration level, stability, reliability and low equipment cost and is convenient to use.

Description

technical field [0001] The invention relates to a digital-to-analog conversion device, in particular to a data baud rate self-adaptive digital-to-analog conversion device capable of collecting and converting non-standard RS485 signals. Background technique [0002] As a serial interface standard, RS485 has the ability to suppress common mode interference. Specifically, use a pair of twisted pairs for differential transmission: define one line as A and the other line as B; usually, the positive level between sending drivers A and B is +2~+6V, corresponding to The logic state is '1'; the negative level is -2V~-6V, corresponding to the logic state '0'. [0003] The RS485 encoding method has the advantage of being simple and efficient. With a high-sensitivity bus transceiver, it can detect a voltage as low as 200mV, so that the signal transmitted by the RS485 standard can be recovered from kilometers away, and it is widely used in signal transmission. However, there are also s...

AI Technical Summary

Problems solved by technology

However, the conventional method can only mechanically decode and identify a single baud rate and data format, and cannot adaptively identify and decode the input baud rate and format, which brings great difficulties to the back-end digital-to-analog conversion and acquisition. great difficulty

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