Private Sub Command1_Click()
On Error Resume Next
For i = 1 To 5
Me.MSComm1.CommPort = i
Me.MSComm1.PortOpen = True
If Err.Number <> 0 Then
MsgBox i & "号端口: " & Err.Description
Else
MsgBox i & "号端口: 可用"
End If
Me.MSComm1.PortOpen = False
Err.Clear
Next i
End Sub
Private Sub Command2_Click()
'用于测试端口打开
Me.MSComm2.CommPort = 2
Me.MSComm2.PortOpen = True
End Sub