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SerialPort does nothing more than echos back what I write.

Posted By:      Posted Date: December 04, 2010    Points: 0   Category :.NET Framework

I have a laptop with a modem.  The OS is Windows 7.

When I use a hyperterminal program, everything works fine.  For example, when I type "atz", it replies "OK."  When I type "atdt 9,15555555" (not a real phone number), it dials into the modem.  So we know that the modem and the hyperterminal work.

Here is my code for SerialPort


SerialPort port = new

port.PortName = "COM3"
port.BaudRate = 1200;
port.Parity = Parity.Odd;
port.DataBits = 7;
port.StopBits = StopBits.One;



port simply echos back what I write.  Does not throw any kind of Exception, but just echos ("atz" returns "atz", "atdt 9,15555555" returns " "atdt 9,15555555" without dialing the number) .  In fact, even non sense lines such as "merry Christmas" simply echos back the same string.

I've downloaded source code from tutorial sites, and it does the same.  I've also tried various things besides just using WriteLine.  I tried using the BaseStream object of Ser

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