RS485-bus-based intelligent cabinet communication method and system

Abstract

The invention relates to an RS485-bus-based intelligent cabinet communication method and system communication between master and slave devices. The master device is connected to at least one slave device by the RS485 bus and slave devices have different address numbers. The method comprises: S1, self definition of a communication protocol format and a command format in a communication protocol is carried out, wherein a preset field expresses a timestamp / user data; and S2, the master device obtains identity information of all the slave devices by following steps: the master device sends broadcast commands to all the slave devices, wherein the timestamps / user data in the broadcast commands at this time are used for identifying unit delay time; the slave devices determine the delay time of the slave devices based on the address numbers and the unit delay time and send return commands including the identity information of the slave devices after waiting with the local delay time after receiving the broadcast commands. Therefore, a conflict problem can be solved; and the master device can obtain addresses of all slave devices automatically without designation.

Description

technical field [0001] The invention relates to the field of intelligent cabinet communication, in particular to a communication method and system for an intelligent cabinet based on an RS485 bus. Background technique [0002] With the widespread popularization and use of smart devices, more and more different types of smart devices are required to communicate with the host in the single-chip system. Due to the limitation of the number of physical ports of the host, and to facilitate the design of upper-layer software, there are usually Multiple devices of the same type or similar functions will be connected to the same port of the host in some way, so as to facilitate the unified access and control of them by the host. [0003] Smart instruments are developed with the maturity of single-chip microcomputer technology. One of the necessary conditions for enterprises to select instruments is to have a network communication interface. The RS232 interface can realize full-duple...

AI Technical Summary

Problems solved by technology

However, due to the compact frame format, it is impossible to distinguish the data in a specific state. This technology cannot automatically obtain the address of the slave device. In addition, it cannot distinguish the successive data returned by the same slave device.

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