Micro-power-consumption M-bus slave end circuit for intelligent instrument communication and communication method thereof

Abstract

The invention provides a micro-power-consumption M-bus slave end circuit for intelligent instrument communication. The circuit is connected with an M-bus, a rectifier bridge circuit of the circuit is connected with an inlet line of the M-bus, the negative end of the rectifier bridge circuit is grounded, the positive end of the rectifier bridge circuit is connected with the positive end of a controllable constant current source circuit, the control end of the controllable constant current source circuit is connected with a microprocessor TX, the negative end of the controllable constant current source circuit is connected with the input of a voltage stabilizing circuit, the output of the voltage stabilizing circuit is connected with a receiving circuit and provides a reference potential for the receiving circuit and an accelerating circuit, a coupling receiving circuit and the accelerating circuit are connected to the positive end of the rectifier bridge circuit through a coupling capacitor, the coupling receiving circuit and the output end of the acceleration circuit are connected with the input end of a reverse circuit, the output end of the reverse circuit is connected with the RX end of the microprocessor, and the RX end is connected with a power source of a controller through a resistor. Meanwhile, a communication method used for the micro-power-consumption M-bus slave end circuit for the intelligent instrument communication is adopted. The micro-power-consumption M-bus slave end circuit and the communication method have the advantages that after the circuit is applied, the steady-state current can be smaller than 50 microamperes and smaller than the standard steady-state current by 30 times, and the communication Baud rate can reach 9600.

Description

technical field [0001] The present invention relates to a micro-power consumption M-bus slave terminal circuit for intelligent instrument communication, especially for data acquisition systems of water meters, gas meters, heat meters and other related metering equipment and instruments. Slave devices connected to the host, and micro-power M-bus circuits in instruments. Background technique [0002] M-Bus, proposed by Paderborn University, is a data bus designed specifically for the transmission of information from consumption measuring instruments and counters. M-Bus has many applications in building and industrial energy consumption data collection. [0003] According to the electrical definition of the M-bus bus standard EN1434-3, the signal transmitted from the host end to the slave end is expressed by the change of the voltage value, that is, the signal sent from the host end to the slave end is a voltage pulse sequence with + 36V represents a logic "1", and +24V repre...

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Problems solved by technology

[0005] Aiming at the structural deficiencies in the prior art, the purpose of the present invention is to provide a micro-power consumption M-bus slave terminal circuit and its communication method for intelligent instrument communication, so as to solve the problem of high cost of application-specific integrated circuits and peripheral devices. Complicated and simple discrete components have poor circuit stability, low communication reliability, and slow communication speed.

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