What is M BUS communication?

The M-Bus remote meter reading system (Symphonic MBUS) is a European standard 2-wire bus, which is mainly used for consumption measuring instruments such as heat and water meters. The same network is used for power supply and communication; If you are interested, you can communicate with it.

The M-Bus works like a bowling ball.

As with the game, the Computing Center and counters can only be opened with the Messdas software in the case of an inquiry from the Computing Center.

data exchange is performed between them. In other words, each terminal can only provide data after the computing center has issued instructions. From the physical point of view of M-bus, there is no data exchange between terminals.

M-Bus is a hierarchical system consisting of a master, several slaves and a pair of connecting cables, all of which are connected in parallel on the bus, and all serial communication on the bus is controlled by the master.

Process. From the computing center to the terminal.

The computing center sends the changed M-Bus voltage to the terminal.

Because the computing center does not interrupt the M-bus voltage during the data exchange process, it can continuously supply power to the terminal with the M-bus voltage. The TSS 721 interface module developed by TI can enable the terminal to turn off the battery inside the terminal when the M-BUS voltage is obtained, so the M-BUS voltage can be provided when the computing center is working, and the system can run even if the terminal does not have an internal battery. In the case of battery interruption and M-Bus shutdown, the result is that the data stops.

From the terminal to the computing center.

The terminal feeds back information DC as it draws current.

Current 1,5 mA pulse current = DC current + 11-20 mA current modulation ensures high immunity to interference.

The terminal feeds back data due to the increase of power consumption, and the two terminals will not exchange data with each other, and only the computing center that provides the power supply can determine the increase in power consumption. The M-Bus protocol is based on the IEC 870 protocol (this protocol is the standard protocol for telematics).A detailed explanation of the extended part of the IEC 870 protocol can be found in DIN EN 1434-3.

The difference between the M-Bus protocol and Telegram is the fixed length and the varying length. Detailed explanations of the telegraph and M-bus are described in DIN EN 1434-3 and the instructions for use of the M-bus, respectively. The distance over which the M-Bus transmits data is related to the following factors:

Network distribution line situation Cable length and cross-sectional area Transmission speed The number of terminals can be increased by adjusting the digital remote controller that acts as a transformer Transmission speed.

Transfer speeds range from 300 to 9600 baud and data exchange takes 0.1 to 0.5 seconds.

Installation precautions.

The cables of the M-BUS system do not need to be fixed and do not exceed the maximum cable standard, the M-BUS has an error-proof function, each digital remote controller can serve 250 terminals at the same time, and the existing two-cable cable in the building in the industrial area can be used as a transmission carrier.

Registration Fees. There is no registration fee.

Installation costs. Due to the use of ** wire, the installation cost is very low.

For a remote meter reading system, the data delay source transmitted on the bus is the water, electricity, gas and other important data consumed by the end user, so the anti-external interference requirements of the bus are very high, to be able to resist various capacitive, inductive coupling interference, all slave equipment and slave equipment and master equipment are isolated from each other. At the same time, it is required that the networking cost is relatively low, the transmission line does not need to use shielded cables, and in order to save costs, the remote power supply mode should be used to provide power to the slave equipment, so as to reduce the use of components as much as possible. To solve these practical problems, it is necessary to adopt a suitable bus structure.

Developed by Dr Horst Ziegler of the University of Paderborn in collaboration with Deutschland GmbH and TechEmgmbh of TI, the concept of the M-Bus is based on the ISO-OSI reference model, but M-Bus is not a network in the true sense of the word. In the seven-layer network model of OSI, M-BUS only defines the functions of the physical layer, link layer, network layer, and application layer, and since the ISO-OSI reference model does not allow the previous level to change parameters such as baud rate, address, etc., M-BUS defines a management layer outside the seven-layer model, and can manage any layer without complying with the OSI model. The proposed code noise state of M-Bus meets the needs of utility meter networking and remote meter reading, and it can also meet the special requirements of remote power supply or battery power supply system.

The bus-based topology of the M-Bus serial communication method is ideally suited for the reliable, low-cost networking requirements of utility meters, where hundreds of slaves can be connected over distances of several kilometers.

The amount of information it can transmit is specifically limited to meet its application. It has the characteristics of being able to transmit over long distances using the most inexpensive cable. The m-bus reacts to each inquiry in to the second, which is perfectly sufficient for the task it is trying to accomplish.

The M-Bus will not be replaced by its data bus, but rather it is the safest and cheapest way to transmit counter readings. This has been proven in the real light travel application: it can adapt to the fluctuating voltage of the power grid.

The M-Bus remote meter reading system (Symphonic MBUS) is a European standard 2-wire 2-bus, which is mainly used for consumption measuring instruments such as heat and water meters.

The M-Bus is a Bicoarse Lapper instrument and counter designed specifically for consumption measurements.

A data bus that transmits information.

designed. M-Bus data acquisition for energy consumption in buildings and industry.

There is much regret in terms of the application of the stool base.