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How to clear unwanted characters from COM buffer

I am suppose to be getting back in my COM Buffer the word " LH FLUSH" however along with the LH FLUSH I get the following "UU LH FLUSH" or "UU LH FL?SH" I clear my InBuffer however I still get the result above. My code is below:

serialPort.BaudRate = "9600"
serialPort.PortName = "COM" & activeport
serialPort.Parity = IO.Ports.Parity.None
serialPort.DataBits = 8
serialPort.StopBits = 1
serialPort.RtsEnable = True
serialPort.Open()

serialPort.Write("<@:L" & tempArray(0) & Total_Bytes & "<" & UpdatePoint & "," & "0" & Int_Rank & "," & GageDescription & "," & USL & "," & LSL & ">")
System.Threading.Thread.Sleep(100)
serialresponse1 = serialPort.ReadExisting

What Am I doing Wrong?

ASKER CERTIFIED SOLUTION

Bob Learned

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Colin

ASKER

Yes you were correct I was sending the commands too fast so the device was not responding in the correct time

Thanks.

Bob Learned

That is what handshaking/flow control configuration are designed for. Does the device require any handshaking, like request-to-send or XOn/XOff? I see where you had RtsEnable set to true, but you didn't set anything for Handshake...