Passive four-path RS232 serial port concentrator

A serial port hub and serial port technology, which is applied in the field of passive four-way RS232 serial port hubs, can solve the problems of inconvenient construction and inability to implement manual adapters, and achieve the effect of low overall energy consumption and simple construction.

Inactive Publication Date: 2015-09-09
YUXI POWER SUPPLY BUREAU OF YUNNAN POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In some projects, the main control terminal needs to receive information from various channels while sending information to multiple terminals. Manu

Method used

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  • Passive four-path RS232 serial port concentrator
  • Passive four-path RS232 serial port concentrator

Examples

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[0015] Example

[0016] According to the RS232 standard, the voltage of logic 1 is from -3V to -15V, the voltage of logic 0 is from +3V to +15V, and the serial port remains at logic 1 when there is no output signal, and the voltage is about -10V.

[0017] Such as figure 1 As shown, the passive four-way RS232 serial port hub of the present invention includes: an input and output interface module, a serial port power-taking module, a single-chip microcomputer, and four-way analog switches. The input and output interface module is responsible for signal reception, shunting and output. The signal received by the serial port is divided into three parts through this module, which are divided into the part of the serial port power module through the diode shunt, and then sent to the microcontroller for logic processing after level conversion Part, and the signal part directly connected to the analog switch. The input and output interface module must complete the coordination of each part...

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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...

Claims

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Application Information

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IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/23049G05B2219/33185
Inventor 张春辉张雍忠郭伟白翠芝钱宁马一杰黄莉白建林杨传旭刘春宏张秀江陈君李建忠段燕茹杨隽
Owner YUXI POWER SUPPLY BUREAU OF YUNNAN POWER GRID
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