Question Serial Port Truncating

[computer guy]

I am using the .Net Com port control to send &HFF (255) to another device however it appears to be truncating it. At the other end I get &H35 (53).
If I send &H0 (0) At the other end I get &H30 (48).

Does anyone know what may be causing this. I have the following settings:

PortName = "Com4"
Parity = IO.Ports.Parity.None
Handshake = IO.Ports.Handshake.None
StopBits = IO.Ports.StopBits.One
DataBits = 8
BaudRate = 9600
WriteBufferSize = 2048
WriteTimeout = -1
ParityReplace = 63


Thank you

 

[JohnH]

I sounds to me you are using Write(string), then know that default Encoding for SerialPort is ASCII, which goes to 127. Change Encoding.

 

[computer guy]

What encoding should I be using for sending bytes 0 to 255?

Thank you

 

[JohnH]

I don't know what encoding your protocol requires, most encodings except ascii would have a character for that value. You could also send byte values if that is what your protocol expects. Use the programming documentation for your serial device.

 

[computer guy]

Thank you for your help. I need to send the raw binary data.

 

[JohnH]

You would then use the Write(buffer,offset,count) method.

 

[computer guy]

Thank you. I worked it out just before you replied.
I can't believe I have been working on this for several hours.