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Method for virtual RS232 interface

A RS232, interface technology, applied in the field of data transmission, to achieve the effect of increasing quantity, improving efficiency and improving functions

Active Publication Date: 2006-06-14
XIAMEN YAXON NETWORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, among various vehicle multimedia devices, almost all GSM modules only provide one RS232 interface

Method used

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  • Method for virtual RS232 interface
  • Method for virtual RS232 interface
  • Method for virtual RS232 interface

Examples

Experimental program
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Embodiment Construction

[0022] The method of virtual RS232 interface of the present invention is used in the vehicle multimedia system.

[0023] The vehicle multimedia system has a GSM module, which provides the system with wireless Internet access and communication functions of the vehicle phone. But its GSM module only provides a physical RS232 interface. If the car multimedia system is required to use wireless Internet access, the car phone can also be used. The solution is to use the physical RS232 interface, and the Internet application corresponds to a virtual RS232 interface to transmit various network application-related data streams; The phone application corresponds to another virtual RS232 interface, which transmits the AT command data of the car phone. The specific method is to add a virtual RS232 interface driver in the software operating system of the vehicle multimedia system. The architecture of this virtual RS232 interface driver is as follows: figure 1 shown. The dotted line box ...

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Abstract

This invented virtual RS 232 interface method relates to a data transmission method by two RS 232 interfaces accessing a same physical RS 232 interface, which uses the data stipulation format of a protocol to differentiate two virtual interfaces: process for transmitting data: one of which receives the due out data to pack said data according to the protocol to be added into the data due out queue of the belonged virtual interface, calling the physical interface drive program to send out the data packets in the queue and the process of receiving data: calling the physical interface drive program to read a data packet to judge its attach and release it in terms of the protocol to store the data content into a buffer storage region of a related virtual interface and inform the upper level to apply and pick up the data.

Description

technical field [0001] The invention relates to a data transmission method, in particular to a data transmission method that provides two virtual RS232 interfaces to access the same physical RS232 interface at the application interface layer. technical background [0002] The RS232 interface of many mature electronic equipment can transmit different data and perform different processing, but the number of RS232 interfaces it provides is less than the RS232 interface function of the electronic equipment. For example, the vehicle multimedia system has a GSM module, which provides the system with wireless Internet access and communication functions of the vehicle phone. If the car multimedia system is required to use the wireless Internet access, the car phone can also be used, which requires the GSM module providing these two communication functions to provide at least two RS232 interfaces for the system to use the Internet and the car phone at the same time. But in fact, amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/08
Inventor 彭勇郭伟雄陈敏
Owner XIAMEN YAXON NETWORKS CO LTD