MSComm

[Ron22]

I have a problem that only happens sometimes. I send a string to the comport and then wait for a reply. I am tring to receive a 7 byte block form the comport and sometimes I lose the first byte. When this happen it will do it every time I try I can resend the request and will recive 6 bytes. Other times it will work fine when I run it and every time I try after that. Any Ideas?

This is what I should reciev in HEX if that matters
31 0D 0a 50 54 58 3E


Opening port

With MSComm1
      .CommPort = 5 'ComPort
      .Handshaking = comNone '2 - comRTS
      .RThreshold = 1
      .RTSEnable = True
      .DTREnable = True
      .Settings = "9600,n,8,1"
      .SThreshold = 1
      .InputMode = comInputModeText
      .InputLen = 1
      .PortOpen = True
      ' Leave all other settings as default values.
    End With

Writing what read to text1.text

Do While Timer < TimeOut + 1
    If FrmHitScores.MSComm1.InBufferCount > 0 Then             'to be sure something in the buffer
      sTEMP = MSComm1.Input                           'get a byte
      strRX = strRX & sTEMP                           'assemble the input bytes into strRX
    End If
    If Len(strRX) = 7 Then      
      for a = 1 to 7
         text1.text = text1.text & Hex(Asc(Mid$(strRX, a, 1)))
      next a
      strRX = ""
      Exit Do
    End If
  Loop

[namrekka]

Is it possible you receive Hex 0x00?
In that case change inputmode to binary and check the "NullDiscard" property. You have to work with byte arrays then.

[Ron22]

namrekka
I can monitor what is being sending and I know the first byte it is sending is a Hex 31. But I do not know what VB is seeing.
I found a work around that seems to work. If I open the port then close it and open it again it seems to work every time.
Not what I want but is ok for testing