vs2005的vb.net serialport.write问题

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Me.SerialPort1.DiscardInBuffer()
Me.SerialPort1.DiscardOutBuffer()

Dim mStr As String = "00000001EDDF"
Dim msnddata(mStr.Length / 2 - 1) As Byte
Dim j As Integer
For j = 0 To mStr.Length / 2 - 1
msnddata(j) = Convert.ToInt32(mStr.Substring(j * 2, 2), 16)
Next

Me.SerialPort1.Write(msnddata, 0, msnddata.Length)

Me.SerialPort1.DiscardInBuffer()
Me.SerialPort1.DiscardOutBuffer()
End Sub


这个是我的发送代码
可是串口显示 FD
这是为什么啊为什么啊为什么啊~~
到底是为为什么啊？？
求高手~！
很急~！