Communication system and method of serial bus with handshake mechanism

Abstract

The invention discloses a serial bus communication method with a handshaking mechanism. The method comprises the following steps of: firstly, connecting a primary device with all the secondary devicesthrough data transceiving lines, and connecting each secondary device with other secondary devices through handshake signal lines; secondly, directly sending instruction data with address codes to the secondary devices through the data transceiving lines; and thirdly, monitoring handshake signals on the handshake signal lines by the secondary devices, and sensing data to the primary device through the data transceiving lines according to the handshake signals. According to the method, the defect that the quantity of serial ports of the primary device is limited is overcome; the serial ports of the primary device can be connected with serial ports of the plurality of secondary devices, and the secondary devices are connected through the handshake signal lines, so that one-to-many and many-to-one ordered communication between the primary device and the plurality of secondary devices and between the plurality of secondary devices are realized. According to the method, data uploading congestions and errors caused by directly connecting the plurality of secondary devices on a communication circuit of the primary device in series in the traditional manner are avoided, so that the systemdata transmission efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of industrial automation control, in particular to a communication method for an industrial control system including a master device and a plurality of slave devices. Background technique [0002] High-speed real-time network communication protocol is a bus technology with independent property rights of Panasonic Corporation. Based on the high-speed implementation of 100Mbps network communication protocol, a ring topology is adopted. Each node, including the upper master control device and multiple slave devices connected to the master control device, has an exit (Tx) and entrance (Rx ), that is, the data output port and the data input port, the data output serial port between the master device and multiple slave devices is connected through the Tx line, and the data input serial port between the master device and multiple slave devices is connected through the Rx line. The high-speed real-time network comm...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the serial port of the device cannot be used as a bus, and can only perform one-to-one transmission between two devices

However, the number of serial ports of the master device is limited. In some applications, such as the robot industry, the master device needs to connect multiple slave devices through the serial port, resulting in having to connect multiple slave devices in series to one serial port channel and use the serial port channel as a serial port. The bus application is connected to the master device

However, connecting multiple slave devices in series on the communication line will lead to data upload congestion or even errors, and may cause the entire system to crash

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