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ratko · Member 3 Joined: 20 Jul 2012 Posts: 524

Use a serial port as a Square wave Generator
Richard L. Grier made a good work.
A RS-232 serial port may be used as a counter/timer and frequency meter, with certain limitations.
This application uses of one of the hardware input handshaking lines to count pulses and to make measurements in code based on pulse timing. This example uses the Carrier Detect (DCD) input line plus ground, but either Dataset Ready (DSR) or Clear to Send (CTS) input lines might be used instead.
Use a serial port as a Square wave Generator Use a serial port as a Square wave Generator

Use a serial port as a Square wave Generator Use a serial port as a Square wave Generator

Download:
http://home.comcast.net/~hardandsoftware/Use%20the%20serial%20port%20as%20a%20Pulse%20counter.doc
Download the EXE (Note the .NET Framework 4.0 is required and must be installed on the target PC).
http://home.comcast.net/~hardandsoftware/FrequencyCounter.zip

Here is an another application and description that may be of interest
Use a serial port as a Square wave Generator Use a serial port as a Square wave Generator

Download:
http://home.comcast.net/~hardandsoftware/SquarewaveGenerator.doc
http://home.comcast.net/~hardandsoftware/SquareWave3.exe

Enhanced Serial Port Object for Visual Studio™ 2008 an Visual Studio 2010
Copyright © Richard L. Grier 2010
Use a serial port as a Square wave Generator Use a serial port as a Square wave Generator

http://home.comcast.net/~hardandsoftware/enhanced_serial_port_object_for.htm
Download the Enhanced SerialPort code now.
http://home.comcast.net/~hardandsoftware/TestEnhanced.ZIP
http://home.comcast.net/~hardandsoftware/TestEnhancedSerialPort.zip