VB.NET中如何處理串口通信接收的數(shù)據(jù)？

你可以預(yù)先約定一個截止附，讀取的字節(jié)統(tǒng)統(tǒng)放到緩存區(qū)里，直到讀到截止附再處理、顯示。

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用vb.net實現(xiàn)網(wǎng)絡(luò)通信

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

VB.NET串口通訊怎么發(fā)送和接收十六進制？

串口通信最終都是用二進制傳輸?shù)模阌么a把二進制轉(zhuǎn)化成十六進制就可以了。不需要額外設(shè)置。

VB.NET和PLC通訊 ，小白有問。

這個圈里的是通訊過程中傳送的Asc碼，包含了PLc的站號地址、指令、起始符等內(nèi)容，具體要看你的PLc通訊協(xié)議。通訊與開關(guān)量是兩回事，你得補習(xí)下與通訊相關(guān)的內(nèi)容。

VB.NET和西門子smart通訊問題。

西門子smart通訊可以用基于tcp的modbus協(xié)議

網(wǎng)上下載一個modubs協(xié)議工具就可以直接讀寫m,db,w等內(nèi)存區(qū)

即使是大型plc，像1500系列的，都是可以這樣通訊的