Private Sub Command9_Click()
If Command9.Caption = "打开串口" Then
Command9.Caption = "关闭串口"
MSComm1.PortOpen = True
Else: Command9.Caption = "打开串口"
MSComm1.PortOpen = False
End If
End Sub
一点击打开串口就直接弹出8002错误
你在打开串口之前必须先设置串口的参数,端口号,波特率等属性,例如:
Private Sub Command9_Click()