Passive four-path RS232 serial port concentrator

Abstract

The invention provides a passive four-path RS232 serial port concentrator. The passive four-path RS232 serial port concentrator is designed according to the problem of a requirement of an existing device for an externally-connected power source. The passive four-path RS232 serial port concentrator of the invention includes an input and output interface module, a serial port electricity taking module, a single-chip microcomputer and a four-path analog switch, wherein the input and output interface module is used for receiving and transmitting serial port signals and dividing the received signals into three paths and transmitting the three paths of signals to the other three modules, the serial port electricity taking module converts one path of signals into 3.3V stable voltage and outputs the 3.3V stable voltage to the single-chip microcomputer and the four-path analog switch so as to provide work voltage for the single-chip microcomputer and the four-path analog switch, and the single-chip microcomputer detects signals of four interfaces and controls the channels of the four-path analog switch, so that one-to-many communication of serial ports can be realized. The baud rate of data communication ranges from 300 to 115200Bd.

Description

technical field [0001] The invention relates to a passive four-way RS232 serial port hub. Background technique [0002] The RS232 standard is a commonly used point-to-point communication standard. In order to realize the one-to-many communication of the serial port, the existing solutions include a multi-channel serial port adapter with manual selection, and a one-to-many serial port hub that requires an external power supply. In some projects, the main control terminal needs to receive information from various channels while sending information to multiple terminals. Manual adapters cannot realize this function, and the external power supply required by the serial port hub will bring inconvenience to the construction. Contents of the invention [0003] In view of the above problems, the present invention provides a passive four-way RS232 serial port hub that realizes full-duplex one-to-four communication of serial ports without modifying the host computer and without addi...

AI Technical Summary

Problems solved by technology

In some projects, the main control terminal needs to receive information from various channels while sending information to multiple terminals. Manual adapters cannot realize this function, and the external power supply required by the serial port hub will bring inconvenience to the construction.

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