Data transmission control method based on RS485 bus and related device

Abstract

The invention is suitable for the technical field of communication, provides a data transmission control method based on an RS485 bus and a related device, and realizes reduction of waste of computing resources and cost of a host. The method is mainly applied to an RS485 bus control system, one end of the RS485 bus control system is electrically connected with a slave computer, the other end of the RS485 bus control system is electrically connected with X hosts through an RS485 bus, and X is a positive integer larger than 1. The data transmission control method comprises the steps that a target data request is received, where the target data request is a data request sent by a target host to a slave, and the target host is one or more of X hosts; the target data request is only forwarded to the slave, so that the slave processes the target data request to obtain corresponding target response data; the method also includes receiving the target response data fed back by the slave; and only forwarding the target response data to the target host.

Description

technical field [0001] The present application belongs to the technical field of communication, and in particular relates to a data transmission control method based on an RS485 bus and related devices. Background technique [0002] The RS485 bus is a standard defining the electrical characteristics of drivers and receivers in a balanced digital multipoint system, defined by the Telecommunications Industry Association and the Electronic Industries Alliance. The RS485 bus adopts half-duplex working mode and supports multi-point data communication. The RS485 bus network topology generally adopts a terminal-matched bus structure, that is, a bus is used to connect each node in series. The RS485 bus adopts balanced transmission and differential reception, so it has the ability to suppress common mode interference. [0003] In the prior art scenario where multiple masters obtain data from a slave through the RS485 bus, because each master is uniformly connected to the RS485 bus,...

AI Technical Summary

Problems solved by technology

[0003] In the prior art scenario where multiple masters obtain data from a slave through the RS485 bus, because each master is uniformly connected to the RS485 bus, when a master sends a data acquisition request to the slave, other All hosts will also receive the data request, which requires deployment of a shielding program for all hosts to shield data requests from other hosts, so that all hosts can shield data requests from other hosts, otherwise data crosstalk between hosts will occur , and deploying and running the shielding program on all hosts will cause a waste of computing resources and costs of the host

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