RS485 repeater with pure hardware arbitration function

Abstract

The invention discloses an RS485 repeater with a pure hardware arbitration function. The RS485 repeater comprises a first RS485 interface chip U1 and a first wiring terminal J1 which are arranged in a host, a second RS485 interface chip U2 and a second wiring terminal J2 which are arranged on a first slave, a third RS485 interface chip U3 and a third wiring terminal J3 which are arranged on a second slave, a first monostable trigger U4A, a second monostable trigger U5A and a third monostable trigger U5B. When the host is in a transmitting state, the two slaves are automatically switched to be in an output state; when the two slaves are in a transmitting state, the slave to which data arrives earlier enters a transmitting state, the host is switched to be in an output state, and the other slave is locked. Pure hardware is used for arbitration, no programming is needed, the Baud rate range is wide, one input ports and two output ports can achieve mutual independence, on-site wiring is convenient, and the monostable triggers can be repeatedly triggered.

Description

Technical field: [0001] The invention belongs to the technical field of communication, in particular to an RS485 repeater with a pure hardware arbitration function. Background technique: [0002] A repeater (RPrepeater) is a device that connects network lines and is often used for bidirectional forwarding of physical signals between two network nodes. The repeater mainly completes the function of the physical layer, is responsible for transmitting information bit by bit on the physical layer of the two nodes, and completes the functions of copying, adjusting and amplifying the signal, so as to extend the length of the network. Due to the loss, the power of the signal transmitted on the line will gradually attenuate. When the attenuation reaches a certain level, the signal will be distorted, which will lead to receiving errors. The repeater is designed to solve this problem. It completes the connection of physical lines, amplifies the attenuated signal, and keeps it the same...

AI Technical Summary

Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is that the RS485 repeater with one input and two outputs in the prior art needs to be programmed to realize slave transmission arbitration, which cannot realize baud rate self-adaptation, and one input and two output ports cannot be to be independent of each other, and field wiring is inconvenient, so a kind of RS485 repeater with pure hardware arbitration function is proposed

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