Question

MSComm1.PortOpen = True 在运行时,总是出现8002错误 ,这到底是怎么回事

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

Answer 1

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()
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
Private Sub Form_Load()
MSComm1.Settings = "9600,n,8,1"
MSComm1.CommPort = 1 'COM1
End Sub