Serial port communication

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Non printable character in C# serial port communication.
When i will send printable character it will received full data
but when i will send nonprinatble character it will give wrong output;

C#

int x=120;
char tdata=system.convert.tochar(x);
SerialPort sp = new SerialPort("Com1", 19200, Parity.None, 8, StopBits.One);
            if (!sp.IsOpen)
            {
                sp.Open();
                sp.Write(tdata);
                sp.BaseStream.Flush();
                sp.Close();
            }

It will give right output data

C#

but when x=129; //this is non printable characters

it will give wrong output

[Edit]Moved code updates from solution.[/Edit]

Posted 22-Aug-11 18:36pm

Chitranjan Pd Asthana

Updated 22-Aug-11 21:24pm

CPallini

v4

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walterhevedeich 23-Aug-11 0:57am

Are you sure this is the exact code? I can see that you have created tdata but have used TData instead.

walterhevedeich 23-Aug-11 1:25am

Do NOT post comments/question as solution. If you have updates to the code, use the Improve question widget instead.

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OriginalGriff · Accepted Answer · 2011-08-22T21:08:00

Solution 2

Don't convert it to char - keep it as byte.
Byte is specifically an eight-bit unsigned data format, which is exactly what you want to send. Char is a longer data type with various encodings allowed, not a 8 bit signed type as in C.

Posted 22-Aug-11 21:08pm

OriginalGriff

Comments

BobJanova 23-Aug-11 4:53am

Good spot.