Hi~
I'm trying to send data between PC and 51 using COM port (RS232).

The 8051 side has no problem because I've tested it with another 8051 (as receiver).

Private Sub Form_Load()
MSComm1.CommPort = 1
MSComm1.Settings = "1200,n,8,1"
MSComm1.RThreshold = 1
MSComm1.InputMode = comInputModeBinary
MSComm1.PortOpen = True
End Sub

Private Sub MSComm1_OnComm()
Dim sData As String
If MSComm1.CommEvent = comEvReceive Then
Cls
sData = MSComm1.Input
Print sData
End If
End Sub


After running the program above, VB print "????" or sometime "??" when the 8051 sends a number.

Can anyone point out what's wrong with my VB program? I've tried to find information about that on the web but it seems no one gets problem like this.

Stanley