Exchange data with remote computers using the standard streaming operators '<'< and '>'>.
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If you are unable to find a free Modbus Slave simulator, here is one.
Implementing Serial Communication in Win9X/2000
Serial data transmission seems a bit difficult for those who are new to the world of serial communication and VC++. Check out this simple class for implementing serial transmission using WINAPI functions.
Serial Communication in Windows
Discover how to do serial communication from within your own applications from this detailed article.
A communication class for serial port
A communication class for serial port
CSerial - A C++ Class for Serial Communications
CSerial - A C++ Class for Serial Communications
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