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关于串口通讯的问题：
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很明显，你还不知道（不会、不习惯）使用事件驱动的方式接收数据。
建议你仔细看看串口组件（无论VB6还是VB.net）的OnComm事件，你的问题很容易解决。
关于以太网通讯：
在TCP通讯中端口确实可以重用，你百度一下“TCP端口重用”能查到很多示例。
但绝大多数情况下不推荐端口重用，而应该采取服务器端建立连接池的方法。
或者，干脆不用TCP，用UDP解决也可以。
很有意思。
原文数据全为：“00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ”
加密后变成了：“09 51 55 F4 FB 10 6F A4 D3 E8 87 46 F8 2F 49 CD ; ”
得出这样的结果是有很多方法都可以实现的：
比如每个原数上加上个常数就可以了。
00+09=09；得出第一组加密后的数值
00+51=51；得出第二组加密后的数值
...
00+CD=CD；得出第16组加密后的数值.
加密的方法还有很多，不过这种最简单。
还有就是你给的原文太单一了，不能够更好的分析数据的规律。
如果你能把原文改为如下这段代码再去加密一下，再把加密结果贴上来看一下就好多了。
00000140h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ;
00000150h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ;
00000160h: 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 ; 00000170h: 00 10 20 30 40 50 60 70 80 90 A0 B0 C0 D0 E0 F0 ;
00000180h: 11 11 11 11 11 22 22 22 22 22 22 EE EE EE FF FF ;
以上是单片机高手团为您解答。
如果还没解决你的问题，可以加我百度HI账号。
用 vb.net socket通信
Dim th As Threading.Thread
2 Dim tcpl As System.Net.Sockets.TcpListener
3
4 Private Sub Form1_Load()Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
5 th = New System.Threading.Thread(New System.Threading.ThreadStart(AddressOf MyListen))
6 th.Start()
7 End Sub
8
9 Public Sub SendMessage()Sub SendMessage(ByVal IP As String, ByVal SendMsg As String)
10 Try
11 If IP "" Then
12 Dim tcpc As New System.Net.Sockets.TcpClient(IP, 5656)
13 Dim tcpStream As Net.Sockets.NetworkStream = tcpc.GetStream
14 Dim reqStream As New IO.StreamWriter(tcpStream)
15 reqStream.Write(SendMsg)
16 reqStream.Flush()
17 tcpStream.Close()
18 tcpc.Close()
19 End If
20 Catch ex As Exception
21 MsgBox(ex.Message.ToString)
22 End Try
23 End Sub
24 Private Sub MyListen()Sub MyListen()
25 Try
26 Dim ipAddress As System.Net.IPAddress = System.Net.Dns.Resolve(System.Net.Dns.GetHostName).AddressList(0)
27 tcpl = New System.Net.Sockets.TcpListener(ipAddress, 5656)
28 tcpl.Start()
29 While True
30 Dim s As System.Net.Sockets.Socket = tcpl.AcceptSocket()
31 Dim MyBuffer(1024) As Byte
32 Dim i As Integer
33 i = s.Receive(MyBuffer)
34 If i 0 Then
35 Dim lstrRec As String
36 Dim j As Integer
37 For j = 0 To i - 1
38 TextBox1.Text += Chr(MyBuffer(j)) ","
39 Next
40 End If
41 End While
42 Catch ex As Exception
43 MsgBox(ex.Message.ToString)
44 End Try
45 End Sub
46
47 Private Sub Button1_Click()Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
48 SendMessage("192.168.0.61", TextBox2.Text)
49 End Sub
使用Winsock控件进行的
Public Function f(ByVal x As Double) As Double
Dim y As Double
y = x ^ 3 - 5 * x ^ 2 + 16 * x - 80
Return y
End Function
Public Function xpoint(ByVal x1 As Double, ByVal x2 As Double) As Double
Dim x As Double
x = (x1 * f(x2) - x2 * f(x1)) / (f(x2) - f(x1))
Return x
End Function
Public Function root(ByVal x1 As Double, ByVal x2 As Double) As Double
Dim x As Double, y1 As Double, y As Double
y1 = f(x1)
Do
x = xpoint(x1, x2)
y = f(x)
If y * y1 0 Then
y1 = y
x1 = x
Else
x2 = x
End If
Loop Until y = 0.0001
Return x
End Function
Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
Dim st As String = "", pb As Integer = 11, sum As Integer = 0
Dim f1 As Double, f2 As Double, x As Double, x1 As Double, x2 As Double
Do
x1 = Val(InputBox("请输入第一个数字"))
x2 = Val(InputBox("请输入第二个数字"))
f1 = f(x1)
f2 = f(x2)
Loop Until f1 * f2 = 0
x = root(x1, x2)
TextBox6.Text = x.ToString
End Sub