Communication method of remote meter transcribing system and communication conversion module used therefor

Abstract

The invention is a communicating method for remote meter reading system and its communication conversion module, adopting a master / slave command communication mode and a data communication mode mixing low voltage power carrier wave with bus communication between data concentrator and each data collector, arranging communication conversion module at the mutual conversion node of communication modes, where the module is provided with bus interface and low voltage power line interface, the bus interface is connected with a MCU, the MCU is connected with carrier wave receiving and transmitting circuits, which is connected with the low voltage power line interface through output drive circuit and signal coupling circuit, the low voltage power line interface is connected with the carrier wave receiving circuit through the signal coupling circuit, filter circuit and mixing amplifier. The method can compensate bus and low voltage power line carrier wave communication modes with each other, reducing the difficulty in laying communication cables and its communication conversion module has a function of two-way transmitting low voltage carrier wave and bus communication data packet, able to realize the conversion between different communication modes.

Description

technical field [0001] The invention belongs to a data communication method used for field devices in a remote meter reading system for electric energy meters of residential users and a communication conversion module used in the method. Background technique [0002] Data communication is an important link in the remote centralized meter reading system of resident user electric energy meters. At present, data communication between field devices in the remote meter reading system is mainly realized in two ways: one is a single bus communication method (that is, the commonly used RS485 bus), and one is a single low-voltage power carrier communication method. The bus method has the advantages of fast speed and reliable communication, but it brings a lot of inconvenience because of the need to lay special lines: for example, when some residential areas do not allow overhead lines, or when the bus needs to cross the road, when encountering such situations, it is necessary to Inc...

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Problems solved by technology

The bus method has the advantages of fast speed and reliable communication, but it brings a lot of inconvenience because of the need to lay dedicated lines: for example, when some residential areas do not allow overhead lines, or when the bus needs to cross the road, when encountering such situations, it is necessary to Increased the difficulty of line laying; the low-voltage power carrier communication method can directly use low-voltage power lines as the communication medium without laying additional dedicated lines, but the disadvantages are high cost, slow communication speed, and low success rate. Influenced by interference signals, communication cannot be realized

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