请做过串口数据接受的高手慷慨解难啊!!!!

[yangmt204]

我在vb.net 中用 SerailPort 控件来接收数据,可为什么接收数据的触发事件SerialPort.DataReceived 老是调用两次呢??
我已经设置了触发此事件的ReceivedBytesThreshold属性了呀.
高手帮解答,小弟在此谢谢拉!!

[clygs]

    Dim com_data As String

    Private Sub mySerialPort_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles mySerialPort.DataReceived
        Try
            com_data = mySerialPort.ReadLine
        Catch ex As Exception
            com_data = ""
        End Try
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

        If com_data <> "" Then
           Me.Timer1.Enabled = False
           msgbox(com_data)   
                           '使用读得的信息               
            Timer1.Enabled = True
	End If
        com_data = ""
    
    End Sub