RS485 communication circuit

A RS485, 1. RS485 technology, applied in the field of RS485 communication circuit, can solve the problem of poor circuit protection performance, and achieve the effect of enhancing bus driving ability, low power consumption and fast response

Inactive Publication Date: 2014-03-12
JINAN NUOHUI ENERGY SAVING TECH DEVCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general 485 communication circuit only has simple data sending and receiving functions and isolation functions, and the protection performance of the circuit is not strong. In addition, for some communications that require fast response or even zero delay requirements, the existing circuits cannot meet this requirement.

Method used

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  • RS485 communication circuit

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Embodiment Construction

[0014] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0015] Such as figure 1 The RS485 communication circuit shown includes the RS485 communication chip ADM2483 and peripheral circuits, the first pin, the seventh pin and the sixteenth pin of the communication chip are respectively connected to the 5V power supply, the second pin of the communication chip and The eighth pin is digitally grounded, the ninth and fifteenth pins of the communication chip are grounded, the third pin of the communication chip is connected to the RX port of the controller, and the sixth pin of the communication chip is connected to the TX port of the controller Connection, the twelfth pin of the communication chip is connected to the 5V p...

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PUM

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Abstract

The invention relates to an RS485 communication circuit comprising an Rs485 communication chip ADM2483 and a peripheral circuit. First, seventh and sixteenth pins of the communication chip are connected with a 5V power source. Second and eighth pins of the communication chip are grounded. Ninth and fifteenth pins of the communication chip are grounded. A third pin of the communication chip is connected with an RX port of a controller. A sixth pin of the communication chip is connected with a TX port of the controller. A twelfth pin of the communication chip is connected to the 5V power source through a resistor R1. A thirteenth pin of the communication chip is grounded through a resistor R4. A fourth pin is connected with a fifth pin. The peripheral circuit is connected to the RS485 communication chip and comprises a capacitor C1, a capacitor C2, a resistor R6, a resistor R7, a digital chip 74HC14, a diode D1, a diode D2, a capacitor C3, and a resistor R5. The RS485 communication circuit has the advantages of low cost, small size, low power consumption, high response speed, zero delay and thoroughness of protection.

Description

technical field [0001] The invention relates to a communication circuit, in particular to an RS485 communication circuit. Background technique [0002] RS485 communication is usually used as a relatively economical communication platform with relatively high noise suppression, relatively high transmission rate, long transmission distance and wide common mode range. The general 485 communication circuit only has simple data sending and receiving functions and isolation functions, and the protection performance of the circuit is not strong. In addition, for some communications that require fast response or even zero delay, the existing circuits cannot meet this requirement. . Contents of the invention [0003] In order to solve the defects in the above-mentioned prior art, the present invention provides an RS485 communication circuit, which not only can realize the isolated communication of RS485, but also greatly enhances the protection performance of the circuit. down tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/01
Inventor 李钢
Owner JINAN NUOHUI ENERGY SAVING TECH DEVCO
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