M-BUS controller

Abstract

The invention discloses an M-BUS controller which can provide power for and communicate with a slave station of an M-BUS system, and is characterized in that a first pole of a regulated power supply is controlled to be conducted or cut off by a second electronic switch and a diode to realize data transmission, and the structure is simple and reliable; a current sampling resistor is connected in series in the M-BUS, data reception is realized by differential current detection and amplification, and the bus controller has higher receiving sensitivity, strong capacity of resisting disturbance, low self voltage drop and long communication distance; the bus controller has a bus fault protection function with high sensitivity and high reliability, thus effectively protecting the system from being damaged; and a matrix switch is used to expand a bus channel, increase the number of slave stations and reduce the cost and energy consumption.

Description

technical field [0001] The invention belongs to the technical field of field bus control, and specifically relates to a controller for M-BUS bus data transmission, which can be used for M-BUS bus water, electricity and heat meters, industrial field instruments, fire alarm and linkage control, smart home, Buildings and communities and other fields. Background technique [0002] M-BUS (Meter-BUS, EN1434-3) is an international standard for consumer meters. It is an economical field bus with good openness. Its topology is bus structure. It is connected by ordinary two-core cable. Arbitrary topological structure wiring construction, its construction cost and difficulty are greatly reduced. [0003] M-BUS bus electrical interface shall meet the following requirements: [0004] When the slave stations are powered by the master station, each slave station can obtain no more than 2mA current, and the driving capacity of the master station should not be less than 64 slave stations....

AI Technical Summary

Problems solved by technology

[0009] The data transmission circuit is relatively complicated, and generally needs to go through shaping filtering, comparison, amplification and other circuits to realize M-BUS bus voltage modulation, which has disadvantages such as cumbersome circuits, complicated debugging, difficult maintenance, and unstable work.

[0010] A large-capacity sampling resistor is connected in series on the M-BUS bus, resulting in a decrease in the output voltage of the M-BUS bus, which affects the communication distance and reduces the number of slave stations.

[0011] The sensitivity of the receiving circuit is not high, the anti-interference ability is poor, and the communication success rate is low

[0012] No bus fault protection function or poor fault protection function (slow response time, low sensitivity, easy to malfunction, etc.), affecting system work or damaging ring equipment components

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