Rapid discriminating multiport control method based on PROFIBUS packet

Abstract

The invention provides a multi-port control method based on the rapid PROFIBUS message identification. The method comprises the following steps: (1) electrification setting; (2) detecting the port signal level by a detecting and isolating circuit detection; (3) detecting the port PROFIBUS signal level by the detecting and isolating circuit, wherein when the signal level is converted from a release state to a transmission state, whether the port receives a message starting signal can be determined; (4) allowing the other ports to be in a transmission state by a multi-path receiving / transmitting control logic circuit, converting the received message into a transmission message signal and outputting the signal to the other ports via a driving and isolating circuit; (5) transmitting a second wave trigger signal when the conversion of the signal level from the transmission state to the release state is detected by the detecting and isolating circuit detection; (6) determining the completion of the message transmission by determining the last time of the second wave trigger signal with the multi-path receiving / transmitting control logic circuit, and closing the other ports; and (7) returning to the step (2). By adopting the method, the message resolution and the baud rate test can be obviated, therefore, the method is a rapid and baud rate-self-adaptive message data flow judgment method.

Description

technical field [0001] The invention relates to a method for quickly identifying PROFIBUS message data flow without parsing PROFIBUS message and self-adaptive baud rate, and a PROFIBUS multi-port data flow control technology based on the method. This method can be applied to the development of multi-port PROFIBUS network equipment, such as PROFIBUS repeater, hub, optical fiber conversion interface and multi-port PROFIBUS gateway, bridge product; it can also be applied to other repeaters and hubs based on RS-485 network Product development of multi-port network equipment. Background technique [0002] In the PROFIBUS network based on RS-485, repeaters are needed to increase network segments to increase PROFIBUS stations and extend PROFIBUS transmission distance. Using PROFIBUS multi-port devices, such as PROFIBUS hubs, can change the PROFIBUS bus-type network topology and realize tree-type or hybrid network structure. Whether it is a repeater, a hub, or other multi-port net...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: under the condition of high baud rate transmission, it will cause the delay of signal transmission and cause the loss of PROFIBUS waveform

This method has complex hardware design, delay and slow speed in parsing the message; because parsing the message involves the upper layer protocol of the network, this method is related to the protocol and is not suitable for other RS-485 networks

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