Cytron Technical Forum

Greetings,

I'm a newbie in this uC field. I just got my PR27 Multi UART board. 1st I try using Cytron's GUI program and everything working fine. Then I try to build my own GUI program using VB6 and have a bit difficulties. Based on the original PR27 source code, to control the led needed the board to receive 2 bytes. So I did try to send 2 byte using VB6 (according to the required data on the PR27 source code). Before I test directly to the board, I did check the transmitted signal (using hyperterminal on another laptop) and everything seems to be sent correctly (I guess). But when I connect to the board, it seems does not react with my VB. Below are the source code, which I hope uC expert here can help me.

Thanks.

MSCOMM Settings

DTREnable : False
EOFEnable : False
Handshaking : 0 - comNone
InBufferSize : 1024
InputLen : 1
InputMode : 0 - comInputModeText
NullDiscard : False
OutBufferSize : 512
ParityReplace : ?
RThreshold : 1
RTSEnable : False
Settings : 9600,n,8,1
SThreshold : 1


VBProgram

Private Sub Form_Load()
MSComm1.PortOpen = True
End Sub

____________________________________________________________________

Private Sub Command2_Click()

If Command2.Caption = "LED 1 On" Then
MSComm1.Output = "1" & "0"
Command2.Caption = "LED 1 Off"

ElseIf Command2.Caption = "LED 1 Off" Then
MSComm1.Output = "1" & "1"
Command2.Caption = "LED 1 On"

End If
End Sub

Did you specify the PortName (COM number) in your VB6 program? Which com port are you connecting to?

Yup, already declared the com port.
I'm using COM1.

Please note that the data to be sent from PC to PR27 should be decimal code, not ASCII.
For example in VB.net (I've never use VB6 before): SerialPort.Write(1);
NOT SerialPort.Write("1");