A kind of rs485 repeater with pure hardware arbitration function

Abstract

The invention discloses an RS485 repeater with a pure hardware arbitration function, comprising: a first RS485 interface chip U1 and a first connection terminal J1 arranged at the host end, a second RS485 interface chip U2 arranged at the first slave end and The second connection terminal J2, the third RS485 interface chip U3 and the third connection terminal J3 arranged at the second slave end, the first monostable trigger U4A, the second monostable trigger U5A, the third monostable trigger device U5B. When the master end sends, the two slave ends automatically switch to the output state. When the two slave ends send, the slave end with data arriving first enters the sending state, the master end switches to the output state, and the other slave end is locked. This device uses pure hardware arbitration, no programming is required, the baud rate range is wide, and the 1 input and 2 output ports can be independent of each other, the field wiring is convenient, and the monostable trigger can be triggered repeatedly.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of communication, in particular to an RS485 repeater with a pure hardware arbitration function. [0003] Background technique: [0004] A repeater (RP repeater) 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 k...

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Problems solved by technology

[0007] 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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