Multi-serial-port parallel transmission circuit based on diodes

Abstract

The invention provides a diode-based multi-serial-port parallel transmission circuit. The circuit specifically comprises a diode D1, a diode D2, a single chip microcomputer and a pull-up resistor R; the positive electrode of the diode D1 is connected with the positive electrode of the diode D2, and is connected to a + 5V power supply through the pull-up resistor R; the number of the single-chip microcomputers is multiple. The negative electrode of the diode D1 and the negative electrode of the diode D2 are connected to communication pins of different single-chip microcomputers. The beneficialeffects of the invention are that the circuit employs the design of two diodes and one resistor, solves a problem of TTL level serial port parallel transmission, achieves the signal transmission of two or more single-chip microcomputers to one single-chip microcomputer, is low in cost, and is easy to achieve.

Description

technical field [0001] The invention relates to the field of electronic circuit design, in particular to a diode-based multi-serial port parallel sending circuit. Background technique [0002] The single-chip serial port is widely used in many fields such as industrial control because of its simple circuit and easy-to-use characteristics. Since the single-chip serial port uses TTL interface level, it is only suitable for one-to-one two-machine communication. However, in practical applications, there are often two-to-one or many-to-one multi-machine parallel communication application requirements. [0003] At present, the common practice of multi-machine communication is to convert the TTL level to RS485 level, but because the RS485 level is a half-duplex communication bus, this method will cause bus conflicts. At the same time, the RS485 level needs to add a dedicated level conversion chip, which will also lead to complex circuits and increased costs. Contents of the inv...

AI Technical Summary

Problems solved by technology

[0003] At present, the common practice of multi-machine communication is to convert the TTL level to RS485 level, but because the RS485 level is a half-duplex communication bus, this method will cause bus conflicts

At the same time, the RS485 level needs to add a dedicated level conversion chip, which will also lead to complex circuits and increased costs.

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