One-to-many data transmission device and data transmission method realized by rs232 interface

Abstract

The invention relates to an RS232 interface realizing one-to-many data transmission device and a data transmission method thereof, comprising a main control board and n data acquisition boards connected to the main control board, characterized in that: the main control board is connected with a main control board RS232 interface circuit, n data acquisition boards are connected with the acquisition board RS232 interface circuit, n data acquisition boards are respectively connected to the main control RS232 interface circuit through the acquisition board RS232 interface circuit connected to it, and finally n data acquisition boards are connected to the main control board. Control board connections. Compared with the prior art, the present invention has the advantages of providing a software and hardware implementation method for RS232 to realize one-to-many high-speed data transmission. The hardware has simple interfaces, strong versatility, stability and reliability, and can realize high-speed transmission. The rate is as high as 2Mbit / s, the serial port has a strong load capacity, and can realize 1 to 16 communication. In the software implementation method, by setting the serial port idle time threshold, it can effectively prevent bus conflicts and improve system stability.

Description

technical field [0001] The invention relates to an RS232 interface realizing one-to-many data transmission device and a data transmission method thereof. Background technique [0002] In some data acquisition systems, a master-slave structure is often adopted, and the main control board needs to perform data interaction with multiple data acquisition boards, that is, to realize one-to-many communication. In these applications, the main control board and multiple data acquisition boards are installed close together, and the communication distance is relatively short. The main control board and multiple data acquisition boards are generally based on serial communication. The traditional solution is to implement one-to-many communication through CAN bus or transfer board. The CAN bus is relatively complicated, and the single-chip microcomputer is required to support the CAN interface, but most of the single-chip microcomputers do not have a CAN interface, so the CAN interface...

AI Technical Summary

Problems solved by technology

The CAN bus is relatively complicated, and at the same time, the single-chip microcomputer is required to support the CAN interface, but most of the single-chip microcomputers do not have a CAN interface, so the CAN interface scheme is not universal

The use of the adapter board solution requires additional software and hardware support, increasing system complexity and cost, and is not the best method

Using RS485 interface for data transmission is generally used in long-distance transmission, and the standard RS485 interface transmission mode is half-duplex, which cannot receive and send data at the same time. It is not suitable for high-speed data transmission occasions, and the RS485 interface transmission mode is not the best. Program

Someone once proposed to use the RS232 interface to realize one-to-many data transmission method, but it needs a special driving circuit, and the communication rate is low, which is not suitable for high-speed data transmission occasions

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