Slave node circuit, communication method and communication device

Abstract

The invention discloses a slave node circuit, a communication method and a communication device, relating to the communication field. The slave node circuit, the communication method and the communication device are used for preventing a bus from hanging so as to guarantee normal data transmission, wherein the slave node circuit is located between a data sending unit and a universal asynchronism receiver transmitter (UART) bus; the slave node circuit comprises a triple gate and a monostable circuit; an input end of the triple gate is connected with the data sending unit; an output end of the triple gate is connected with the UART bus; the triple gate is used for controlling connection state of the communication controller and the UART bus; the monostable circuit comprises a first input end and an output end; the first input end of the monostable circuit is connected with the data sending unit; the output end of the monostable circuit is connected with an enabling end of the triple gate.

Description

technical field [0001] The invention relates to the communication field, in particular to a slave node circuit, a communication method and a communication device. Background technique [0002] In the plug-in communication device, between the main central processing unit (Central Processing Unit, referred to as CPU) board and various expansion boards, it is necessary to pass through the Universal Asynchronous Receiver / Transmitter (UART for short) bus on the backplane. communicate with each other. [0003] UART bus is used for data transmission, which is generally realized through a one-to-multipoint master-slave serial port, one master node and the rest are slave nodes. When the serial ports between the master node and the slave nodes are connected by bus, each slave node shares a sending bus. In the prior art, the main CPU board usually uses a decoder (for example: 74ls138 chip) to poll and open the enabling pins of each slave node (tri-state gate) on the expansion board, ...

AI Technical Summary

Problems solved by technology

When the master node or the slave node has no data to send, it usually sends a high level to keep the serial bus high; but if any of the slave nodes fails, for example, a slave node’s enable pin fails, it sends a fixed low level , the TX bus will be pulled down all the time, and other slave nodes will no longer be able to use this TX bus. A damaged slave node may hang the entire bus, that is, the so-called bus hanging phenomenon occurs, which seriously affects the data. normal transmission, and the normal operation of the entire communication system

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