Method for implementing ring redundancy networking of serial port device

Abstract

The invention discloses a method for implementing ring redundancy networking of a serial port device. The method specifically comprises the following steps: S1, when a communication link is faulty, another wholesome communication link can be enabled, and a signal received by a transceiver is output to a transmitting end of the transceiver after meeting a signal received by the serial port device,and the node in a ring network can receive the data sent by any network node in the ring network; and S2, a loopback termination termination decision circuit detects an output signal of automatic data flowing to a control circuit. The invention relates to the technical field of industrial automation. By adoption of the method for implementing ring redundancy networking of the serial port device,the conversion between a differential signal and a transceiving single-end signal is realized, a worker does need to consume a lot of time to pay attention to the baud rate, the verification mode, theflow control and other parameters of the connected serial port device, and whether the present level node is the destination of loop data transmission is judged by detecting the signal sent by the serial port device connected with the present level node.

Description

technical field [0001] The invention relates to the technical field of industrial automation, in particular to a method for realizing ring redundant networking of serial port devices. Background technique [0002] The ring network uses a continuous ring to connect each device together, which can ensure that the signal sent by one device can be seen by all other devices on the ring, and the ring network redundancy refers to whether the switch supports network emergence When the cable connection is interrupted, the switch receives this information, activates its backup port, and restores the network communication to normal operation. At the same time, the switch with the 7-port and 8-port disconnected in the network, the relay is closed, and the indicator light sends a signal to the user. Error alarm, after the cable is repaired to normal, the relay and the indicator light will return to the normal state. The ring network redundancy technology can enable another sound communic...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for implementing ring redundant networking of serial devices, which solves the problem that the conversion between differential signals and single-ended signals cannot be realized, and the staff needs to spend a lot of time paying attention to the connected signals. The baud rate, verification method, flow control and other parameters of the serial port device cannot determine whether the communication link is normal by comparing the signal sent by the network node at the current level with the received signal waveform. The detection of the signal sent by the serial device to determine whether the node at this level is the end point of the loop data transmission, which cannot achieve the purpose of avoiding the self-excitation of the loop

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