va day la code vb cua minh :
Code:
Private Sub cmdClosecom_Click()
MSComm.PortOpen = False
Cmdopencom.Enabled = True
Cmdstart.Enabled = False
cmdClosecom.Enabled = False
End Sub
Private Sub cmdexit_Click()
Unload Me
End Sub
Private Sub Cmdopencom_Click()
If MSComm.PortOpen = True Then
MSComm.PortOpen = False
End If
MSComm.CommPort = 1
MSComm.Settings = "9600,N,8,1"
MSComm.InBufferCount = 0
MSComm.InputLen = 0
MSComm.PortOpen = True
cmdStop.Enabled = False
Cmdstart.Enabled = True
Cmdopencom.Enabled = False
cmdClosecom.Enabled = True
End Sub
Private Sub Cmdstart_Click()
MSComm.Output = "a"
cmdStop.Enabled = True
Cmdstart.Enabled = False
End Sub
Private Sub cmdStop_Click()
MSComm.Output = "b"
cmdStop.Enabled = False
Cmdstart.Enabled = True
End Sub
Private Sub Form_Load()
Cmdstart.Enabled = False
cmdStop.Enabled = False
cmdClosecom.Enabled = False
End Sub