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'vb.net的串口接收数据要用到委托
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Delegate Sub SetTextCallback(ByVal InputString As String) '声明一个委派类，并声明符合函数参数有一个，而其型态是字符串
Private Sub ShowString(ByVal comData As String)
txt_Re.Text = comData '将收到的数据入接收文字框中--- txt_Re.Text 是接收用的文本框
txt_Re.SelectionStart = txt_Re.Text.Length
txt_Re.ScrollToCaret()
End Sub
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived‘自动接收事件
Dim inData As String = SerialPort1.ReadExisting
Dim d As New SetTextCallback(AddressOf ShowString)
Invoke(d, inData)
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click '发送指令
SerialPort1.Write("123")
End Sub
串口通讯本来就是传送的字符的Ascll码。如果你传送的是二进制数据，可以把二进制的数据每8bit换算成一个对应的字符传过去，接收端逆向转换过来即可。
使用委托方式处理：
Public Class Form1
Dim mSTR As String
Dim strData As String
Dim strDat As String
Dim mRecvByte() As Byte
Dim Hexsj As String
Dim form2 As Form
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
Dim mSize As Integer = Me.SerialPort1.BytesToRead
ReDim mRecvByte(mSize - 1)
SerialPort1.Read(mRecvByte, 0, mSize)
BeginInvoke(New EventHandler(AddressOf ONMLoadA), SerialPort1.BytesToRead()) '使用委托方式显示接收到的字符串
End Sub
Sub ONMLoadA(ByVal sender As System.Object, ByVal e As System.EventArgs) '委托
strDat = ""
TextBox1.Text = ""
Dim i As Integer
For i = 0 To UBound(mRecvByte) 'mSize - 1
strData = strData IIf(mRecvByte(i) 15, Hex(mRecvByte(i)), "0" Hex(mRecvByte(i))) " "
Next
Dim sj As Byte
For i = 1 To Len(strData) Step 3 '处理为ASCII字符
sj = Val("H" Mid(strData, i, 2))
If sj 32 Or sj 128 Then '当接收字节中有Chr(0)时，其后字符被切割
strDat = strDat "."
Else
strDat = strDat Chr(sj)
End If
Next
TextBox1.Text = strDat '显示字符
TextBox2.Text = strData '显示为16进制
TextBox3.Text = Len(strData) / 3
End Sub
你可以这样操作：
Form1.BeginInvoke(Sub()
'一些操作
End Sub)
这样主线程就会放下手里的事情并执行Sub里的操作了