Transformer substation data acquisition communication MODEM and modulation-demodulation method

Abstract

The invention discloses a transformer substation data acquisition communication MODEM, used for communicating a data acquisition terminal with a master station and comprising a master controller, a modulation output circuit and an input demodulation circuit, wherein the modulation output circuit adopts a digital / analog conversion circuit to convert a modulation output signal into an analog signal for output; the input demodulation circuit adopts a comparator to convert an input modulation analog signal into a pulse signal to be sampled by the master controller and reduced into a standard serial port signal; and the invention further discloses a modulation-demodulation method adopted by the transformer substation data acquisition communication MODEM, which is used for completing modulation output, demodulation input and check bit self-adaption in a communication process. The transformer substation data acquisition communication MODEM disclosed by the invention completes the communication of the device by adopting a manner of combining hardware with software, which avoids the use of a special modem chip and an additional controller, so that the cost is lower, and the purchase is convenient; and the communication method is cured in the universal master controller, so that the modification and application are flexible, and the adaptability is wide.

Description

technical field [0001] The invention relates to the field of data transmission, in particular to a substation data collection communication MODEM and a modulation and demodulation method. Background technique [0002] During the data acquisition process of the substation, the communication between the data acquisition terminal of the substation and the master station (also known as the master station) of electric energy meter data acquisition is completed through the dedicated line MODEM communication device. The dedicated line MODEM communication device can reliably upload the data collected by the data acquisition terminal to the main station through the dedicated line, and the communication distance can reach several thousand meters, which is extremely reliable. [0003] Existing dedicated line MODEM communication devices generally use dedicated communication chips to complete the modulation and demodulation of transmission signals. At present, the most common dedicated ...

AI Technical Summary

Problems solved by technology

[0006] (1) There are very few manufacturers of dedicated modem chips, resulting in high prices of dedicated modem chips and difficulty in procurement;

[0007] (2) The currently used modem chip needs to be controlled by an additional single-chip microcomputer, which makes the product cost higher

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