One of those cases where the problem is probably right under my nose
but I can't see it. This serial test code fails to send the right data:

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles ButtonCAM1.Click
        Dim TestData() As Byte = {&HFE, &H11, &H11, &HFF}
        Using KeyerCom As IO.Ports.SerialPort = _
My.Computer.Ports.OpenSerialPort(KeyerPortName, 38400,
IO.Ports.Parity.None, 8, IO.Ports.StopBits.One)
            KeyerCom.DtrEnable = True
            KeyerCom.Write(TestData, 0, 4)
        End Using
    End Sub

Checking with a serial monitor, I find that it actually sends code
sends  a NUL (&H00) after every byte sent. So the stream actually sent
(as hex)is: FE 00 11 00 11 00 FF 00

Any ideas?

gene.ja***@gmail.com wrote:
Show quoteHide quoteIt sounds like an encoding issue. You could try using the Encoding
class to get a string using a different encoding:

Dim s As String = Encoding.UTF8.GetString(TestData)
KeyerCom.Write(s)

I'm not sure if this will solve your problem, though.

Chris Dunaway wrote:
Been there. My data is declared bytes because if I encode as UNICODE
UTF8 or ASCII, output for bytes >7F is translated to multi byte strings.

gene.ja***@gmail.com wrote:
Have you tried Encoding.Default?

Because SerialPort uses ASCIIEncoding by default, and you have not set any
other Encoding, I would expect your transmission to be translated to {&H3F,
&H11, &H11, &H3F}. That is with all bytes above &H7F (127) translated to
&H3F (63 or ?).  This behaviour is clearly stated in the documentation.


<gene.ja***@gmail.com> wrote in message
Show quoteHide quote

Stephany Young wrote:
You are correct. That is almost the behavior if I send a string it
actually sends 3F 00 11 00 11 00 3F 00. If I say xxx.write (Chr(&FF)) I
will get 3F 00 out of the serial port.
I am sending a byte array and so should not be getting any UNICODE
translation. I am puzzled by the incusion of  the NUL after each
character.

I might think there's an anomaly with my serial monitor, but I have
another program that sends these strings and it shows the right data on
the monitor.

Hi,

I send binary data frequently, and haven't seen this problem.  Are you sure
that the code that you've posted is accurate.  I added a button the the
VS2005Terminal example code on my web site as follows:

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button2.Click

Dim TestData() As Byte = {&HFE, &H11, &H11, &HFF}

'Dim TestData(3) As Byte

'TestData(0) = &HFE

'TestData(1) = &H11

'TestData(2) = &H11

'TestData(3) = &HFF

SerialPort.Write(TestData, 0, 4)

End Sub


The array initializer code AND the explicit assignment code sent the correct
data (verified by viewing it on a serial data analyzer).  Encoding applies
to String data only, not arrays of type Byte -- so, it should work "as
advertised" unless there is something far from my experience.  If you send
me email, I can forward the example that I fiddled for this test.

Dick

Actually, I suspect that you have a receiving/viewing problem.  If you are
attempting to assign receive data to a String (don't do this!) using
ReadExisting, your code will not work.  Instead, you must assign binary data
to an array of type Byte -- using the Read method.

Dick Grier wrote:
Thanks. You're right, the code is fine. My serial monitor is not!

My serial monitor program (COMMSNIFFER 1.0.32) WAS tested and working
fine weeks ago ... on an XP box. I was monitoring, however, with a
WinME machine and there the COMMSNIFFER shows that extra NUL. Thinking
I was crazy, I retested COMMSNIFFER on the XP box today and it works
fine there. And so does my code.

Thanks very much for your kind help.
-Gene

Hi,

Try my VirtualNullModem/DataMonitor program (software downloads on my
homepage) and see if this works on your trouble machine.

Dick

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