Low voltage apparatus communication protocol adapter

Abstract

The invention relates to a low voltage apparatus communication protocol adapter comprising a dual microprocessor, dual Modbus RTU protocol conversion circuits, a Profibus DP, Device Net protocol conversion circuits, an off-chip data memory, a liquid crystal display and a keyboard. An on-chip universal asynchronous receiver transmitter of the dual microprocessor is connected to RS485 level conversion transceiver circuits of the dual Modbus RTU protocol conversion circuit and ProfibusDP, an on-chip controller local area network is connected with conversion transceiver circuits of the DeviceNet, and low-voltage apparatus data acquisition and bus command and event response can be completed; a 12 C communication module of the dual microprocessor and a 12 C-based off-chip data memory are connected, and data storage and extraction of processed low-voltage apparatus parameters. According to the technical scheme, a dual microprocessor and the caching technique are adopted, response time of other adapter during operation is shortened, and the low voltage apparatus communication protocol adapter can be used as a centralized controller, a network small-size server and an adapter; connection of utmost three types of buses can be completed, adaptability of low voltage apparatuses during networking is improved greatly, and users can assemble the adapter conveniently.

Description

technical field [0001] The invention belongs to a low-voltage electrical appliance accessory part, in particular to a low-voltage electrical appliance communication protocol adapter common to MODBUS-RTU, Profibus DP, and Devicenet protocol communications of universal circuit breakers, molded case circuit breakers, and thermal relays. Background technique [0002] Low-voltage electrical appliances in known low-voltage power distribution networks generally use MODBUS-RTU, Profibus DP, and Devicenet communication protocols for data networking communication. However, in actual use, because the entire low-voltage system is generally composed of products from several low-voltage electrical appliances manufacturers, the communication protocols attached to the low-voltage electrical appliances may be different or the content of the agreement may be slightly different. When networking, it is necessary to purchase a dedicated low-voltage electrical appliance The communication protocol...

AI Technical Summary

Problems solved by technology

However, in actual use, because the entire low-voltage system is generally composed of products from several low-voltage electrical appliances manufacturers, the communication protocols attached to the low-voltage electrical appliances may be different or the content of the agreement may be slightly different. When networking, it is necessary to purchase a dedicated low-voltage electrical appliance The communication protocol adapter performs protocol conversion, which increases unnecessary costs and prolongs the inspection time of the low-voltage electrical appliance network; on the other hand, it uses a small cabinet space during installation, and the adapters between manufacturers cannot be used universally. Bring great difficulty to user installation

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