========================================================================
MICROSOFT FOUNDATION CLASS LIBRARY : RS485Comm
========================================================================
AppWizard has created this RS485Comm application for you. This application
not only demonstrates the basics of using the Microsoft Foundation classes
but is also a starting point for writing your application.
This file contains a summary of what you will find in each of the files that
make up your RS485Comm application.
RS485Comm.dsp
This file (the project file) contains information at the project level and
is used to build a single project or subproject. Other users can share the
project (.dsp) file, but they should export the makefiles locally.
RS485Comm.h
This is the main header file for the application. It includes other
project specific headers (including Resource.h) and declares the
CRS485CommApp application class.
RS485Comm.cpp
This is the main application source file that contains the application
class CRS485CommApp.
RS485Comm.rc
This is a listing of all of the Microsoft Windows resources that the
program uses. It includes the icons, bitmaps, and cursors that are stored
in the RES subdirectory. This file can be directly edited in Microsoft
Visual C++.
RS485Comm.clw
This file contains information used by ClassWizard to edit existing
classes or add new classes. ClassWizard also uses this file to store
information needed to create and edit message maps and dialog data
maps and to create prototype member functions.
res\RS485Comm.ico
This is an icon file, which is used as the application's icon. This
icon is included by the main resource file RS485Comm.rc.
res\RS485Comm.rc2
This file contains resources that are not edited by Microsoft
Visual C++. You should place all resources not editable by
the resource editor in this file.
/////////////////////////////////////////////////////////////////////////////
AppWizard creates one dialog class:
RS485CommDlg.h, RS485CommDlg.cpp - the dialog
These files contain your CRS485CommDlg class. This class defines
the behavior of your application's main dialog. The dialog's
template is in RS485Comm.rc, which can be edited in Microsoft
Visual C++.
/////////////////////////////////////////////////////////////////////////////
Other standard files:
StdAfx.h, StdAfx.cpp
These files are used to build a precompiled header (PCH) file
named RS485Comm.pch and a precompiled types file named StdAfx.obj.
Resource.h
This is the standard header file, which defines new resource IDs.
Microsoft Visual C++ reads and updates this file.
/////////////////////////////////////////////////////////////////////////////
Other notes:
AppWizard uses "TODO:" to indicate parts of the source code you
should add to or customize.
If your application uses MFC in a shared DLL, and your application is
in a language other than the operating system's current language, you
will need to copy the corresponding localized resources MFC42XXX.DLL
from the Microsoft Visual C++ CD-ROM onto the system or system32 directory,
and rename it to be MFCLOC.DLL. ("XXX" stands for the language abbreviation.
For example, MFC42DEU.DLL contains resources translated to German.) If you
don't do this, some of the UI elements of your application will remain in the
language of the operating system.
/////////////////////////////////////////////////////////////////////////////
串口通信程序
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更新于2008-07-23
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串口通信程序是一种用于设备间数据传输的重要工具,尤其在嵌入式系统、工业自动化、物联网设备等场景中广泛应用。本程序涵盖了异步和同步两种通信模式,这为用户提供了更多的选择和灵活性。
我们要理解什么是串口通信。串行通信是指数据以位(bit)为单位,按顺序一位一位地传输,相对于并行通信,它只需要较少的传输线,成本较低,适合远距离传输。在计算机中,串口通常指的是串行端口,如COM1、COM2等,这些接口遵循特定的通信协议,如RS-232、RS-485或USB转串口等。
异步通信是串口通信的一种常见方式,特点是数据传输不依赖时钟信号,而是通过起始位、停止位和可能的校验位来确保数据的正确传输。起始位通常为低电平,表示数据传输的开始;数据位紧跟其后,可以是5、7或8位;接着是可选的奇偶校验位,用于检查数据传输的错误;最后是停止位,通常是1或2位高电平,表示数据传输的结束。这种通信方式允许两个设备在没有共同时钟的情况下进行通信,但可能会导致数据同步问题。
同步通信则不同,它依赖于一个共同的时钟信号,所有数据都在这个时钟的控制下传输。这种方式可以实现高速、高精度的数据传输,但需要设备间有良好的时钟同步,适用于需要大量数据快速交换的场合。
在`serialcommpro`这个程序中,用户可以设置各种串口参数,如波特率(Baud Rate)、数据位(Data Bits)、停止位(Stop Bits)、校验位(Parity)以及硬件握手(Hardware Handshaking)等。波特率决定了每秒传输的位数,常见的有9600、19200、38400、115200等。数据位决定每次传输的数据量,一般为8位。停止位用于保证接收方能正确识别数据帧的结束。校验位用于错误检测,有无校验、奇校验、偶校验等选项。硬件握手则是一种确保数据正确接收的方法,例如使用RTS/CTS(请求发送/清除发送)或DTR/DSR(数据终端就绪/数据设备就绪)信号。
此外,程序可能还包含错误处理机制,如超时检测和重传功能,以应对数据传输过程中的错误。用户界面可能提供实时数据监视器,用于查看收发的数据流,便于调试和问题定位。同时,API接口的提供使得该程序能够方便地集成到其他系统或应用程序中。
`serialcommpro`是一个功能完善的串口通信程序,支持异步和同步通信模式,适用于多种应用场景,无论是开发人员还是普通用户都能从中受益。它的存在简化了设备间的通信问题,提高了数据传输的效率和可靠性。
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