Remote transmission method of data in asynchronous serial port

An asynchronous serial port and remote transmission technology, applied in the field of data transmission, can solve the problems of unstable monitoring system and frequent modification of transmission software, reduce the complexity of opening and maintenance, improve the flexibility of networking, and achieve remarkable effects.

Inactive Publication Date: 2006-04-19
晋江市高新技术开发办公室
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is to solve the problem that the transmission software of the remote monitoring system is modified too frequently, which causes the instability of the monitoring system, and proposes a remote transmission method of asynchronous serial port data

Method used

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  • Remote transmission method of data in asynchronous serial port
  • Remote transmission method of data in asynchronous serial port
  • Remote transmission method of data in asynchronous serial port

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Embodiment Construction

[0019] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] figure 1 It has already been explained in the background art.

[0021] figure 2 It is a flow chart of the remote transmission method of asynchronous serial port data proposed by the present invention. Such as figure 2 Shown, the method that the present invention proposes comprises the following steps:

[0022] a. Perform high-frequency sampling on the measurement data of the asynchronous serial port of the transmission smart device, and perform serial-to-parallel conversion at the same time. The sampling frequency is Fs; according to the sampling theorem, in order to ensure that the signal is not lost, the sampling frequency must be greater than 2 times the signal frequency, that is, the high Frequency sampling frequency Fs>2 asynchronous serial port baud rate Fc. In the prior art, the baud rate Fc of the asynchronous serial po...

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Abstract

The method includes steps: (1) sampling in high frequency is carried out for measured data output from asynchronous serial port in intelligent device based on sampling theorem; (2) converting the sampled data to parallel, and storing it to reception FIFO; (3) after reception FIFO is full, reading out all FIFO, and packing data according to TCP / IP protocol; (4) through Ethernet, sending packets to remote monitoring center; (5) being received packets from Ethernet, the monitoring center stores the packets to transmission FIFO; (6) if the transmission FIFO is not empty, then parallel to serial conversion is carried out in sampling frequency, and data in transmission FIFO is output to asynchronous serial port, executing step (8); (7) otherwise, padded FIFO with free codes is output to asynchronous serial port; (8) measured data are sent to monitoring host. Advantages are: lowering engineering complexity, raising stability and flexibility.

Description

technical field [0001] The invention relates to a data transmission method, in particular to a transmission method of asynchronous serial port data in a remote monitoring system. Background technique [0002] In the field of remote monitoring, asynchronous serial ports are often used to transmit the measurement data of smart devices (such as air conditioners and oil generators) to the remote monitoring center monitoring host, while traditional asynchronous serial transceivers (UART), such as RS232 / 422, have a transmission distance of No more than 100 meters, can not meet the long-distance transmission requirements. [0003] For the remote transmission of asynchronous serial port data, the usual steps of the existing method are: 1. Through the asynchronous serial port, according to the communication protocol provided by the smart device, receive the measurement data of the smart device and store it in the cache device; 2. Pack according to the TCP / IP protocol 3. Send the mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04L12/40H04L29/08
Inventor 林彬
Owner 晋江市高新技术开发办公室
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