Serial Port Mscomm
Sep 12, 2007 Serial port communication using MSComm control - posted in Ask for Help: Can someone please help me in implementing serial port communication using the MSComm control. I have had some major issues using MSCOMM and finding. To do when data is received from the serial port. Tutorial - Use MSCOMM with a serial.
Hi, i am converting my application from visual basic 6 to visual basic.net, but i have a problem with serial port, in vb6 i used MSCOMM, now in vb.net there is SerialPort componet. My problem is to convert this code: - Private Sub FormLoad MSComm1.CommPort = 8 MSComm1.Settings = '9600,n,8,1' MSComm1.RThreshold = 1 MSComm1.PortOpen = True End Sub Private Sub MSComm1OnComm Dim Rx$ Rx$ = MSComm1.Input If Len(Rx$) 9 Then Text2.text = ' Text2.text = Text2.text & Rx$ If Rx$ = '0415151A74' Then WindowsMediaPlayer1.URL = 'C: eduglow suoni asciugacapelli.wav' schermo.Picture = LoadPicture('C: eduglow figure asciugacapelli.jpg') Call WindowsMediaPlayer1.Controls.Play End If End sub How to convert it? Thank's a lot!! Public Class Form1 Dim Rx As String = ' Public Event DataReceived As IO.Ports.SerialDataReceivedEventHandler Private Sub Form1Load( ByVal sender As System.
Object, ByVal e As System.EventArgs) Handles MyBase.Load SerialPort1.PortName = 'COM1' SerialPort1.BaudRate = 9600 SerialPort1.Parity = IO.Ports.Parity.None SerialPort1.DataBits = 8 SerialPort1.StopBits = IO.Ports.StopBits.One 'SerialPort1.Handshake = IO.Ports.Handshake.None SerialPort1.RtsEnable = True SerialPort1.Open 'If SerialPort1.IsOpen = True Then ' SerialPort1.Write('MicroCommand') 'End If End Sub Private Sub SerialPort1DataReceived( ByVal sender As System. Public Class Form1 Dim Rx As String = ' Public Event DataReceived As IO.Ports.SerialDataReceivedEventHandler Private Sub Form1Load( ByVal sender As System. Object, ByVal e As System.EventArgs) Handles MyBase.Load SerialPort1.PortName = 'COM1' SerialPort1.BaudRate = 9600 SerialPort1.Parity = IO.Ports.Parity.None SerialPort1.DataBits = 8 SerialPort1.StopBits = IO.Ports.StopBits.One 'SerialPort1.Handshake = IO.Ports.Handshake.None SerialPort1.RtsEnable = True SerialPort1.Open 'If SerialPort1.IsOpen = True Then ' SerialPort1.Write('MicroCommand') 'End If End Sub Private Sub SerialPort1DataReceived( ByVal sender As System.
AngeloErre said: Hi, i am converting my application from visual basic 6 to visual basic.net, but i have a problem with serial port, in vb6 i used MSCOMM, now in vb.net there is SerialPort componet. My problem is to convert this code: Hi Angelo, Welcome to MSDN forums! In.NET, please use the System.IO.Ports.SerialPort Class to replace the VB6 MSCOMM component. The following is the equivalent code sample in VB.NET. Drag&drop SerialPort1 from Toolbox onto Form1. How do I implement Serial COM Port communication in.NET?
Using the SerialPort class to implement Serial COM Port communication. It represents a serial port resource. This class provides synchronous and event-driven I/O, access to pin and break states, and access to serial driver properties. We can control a serial port file resource by using this class. System.IO.Ports.SerialPort Class Members (Properties, Methods, Events,etc.) Article: Related threads with code samples: Best regards, Martin Xie. Public Class Form1 Dim Rx As String = ' Public Event DataReceived As IO.Ports.SerialDataReceivedEventHandler Private Sub Form1Load( ByVal sender As System. Object, ByVal e As System.EventArgs) Handles MyBase.Load SerialPort1.PortName = 'COM1' SerialPort1.BaudRate = 9600 SerialPort1.Parity = IO.Ports.Parity.None SerialPort1.DataBits = 8 SerialPort1.StopBits = IO.Ports.StopBits.One 'SerialPort1.Handshake = IO.Ports.Handshake.None SerialPort1.RtsEnable = True SerialPort1.Open 'If SerialPort1.IsOpen = True Then ' SerialPort1.Write('MicroCommand') 'End If End Sub Private Sub SerialPort1DataReceived( ByVal sender As System.
Your VB6 application is using polled I/O, and the example code that apparently fits every serial port scenario on Earth is using an event driven model because that is how the control works. It is actually a much more robust and efficient model than using polled I/O, and your code will be much smaller, more coherent, and robust if you write it the way the control wants to see it. (Event driven state machine) You can either hang out in that function and force events to be handled by yielding somehow, or.you can change the application to be event-driven in the first place, which is actually easier, since it will make your app fit into the.NET model better anyway. I would replace the code from -problem starts here- on with setting a variable that indicated that you were waiting for a request response. You will need to add the DataReceived Sub, and handle the response there. You likely have a finite number of states, so an enumerated type would make a great state machine indicator. In your scenario, you are sending a request to the device on the other end, so that state is something like, REQUESTSENT, or AWAITINGRESPONSE.
So, you set the state machine variable to that value in your snippet, as opposed to sitting there waiting for the response. In the receive handler, check to see if you are in the appropriate mode, and then act on the data in that handler. You might need to either use some globals to save states, or other information, or use functions that provide the same thing.
Ps/2 Port
Hi - I'm an engineer working on trying to control a process using electrical resistance as a feedback. I had a development controller running in Excel VBA communicating with a Fluke 8845A digital multimeter. My pc recently died (for unrelated reasons) and am now attempting to setup the controller on another pc - but no luck. The controller relies upon communicating with the 8845A multimeter through a piece of code written in Excel VBA.
Serial Port Communication Windows
The code uses MSComm to data to the multimeter and recieve data back from it. This is a nice way to run the controller as I can take the data, process it in vba code, store it to the spreadsheet and then directly provide feedback on what to do next to a robot.
I followed the process of downloading the MSComm ocx into the windows system folder (& system 32), registering it through reg command prompt, altering licences and this is where it goes wrong. I can't add the mscomm axtive x object to a worksheet in excel. I get the following messages: Cannot insert object. Can anyone help - I looked at removign the need for the MSComm use by employing some code I've found on-line but am having difficulty in getting this to work - I can open the port and send some data but have errors coming up when I try to read data. I need a solution asap!!!
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PS - this is to support a development process - the full production process controller will be programmed by a proper software engineer - not an aero eng! Microsoft Blog (URL 1) recommends replacing MSCOMM32.OCX with API (Application Programming Interface) code and links to a Serial Port Communication page (URL 2) where you can download VB source code to use the API. May be Microsoft update might have caused this problem. Some say that the older version of MSCOMM32.OCX has had its 'kill bit' set by update 'kb969898' (which was installed on system on 28th June). Suggestions are to roll back the update, download an new version of MSCOMM32.OCX, or use a completely different method to read/write to the serial ports. Excel checks the Registry entry in 2 places for lincense for that control: HKEYLOCALMACHINE SOFTWAR E Classes Licenses and HKEYCLASSESROOT Licenses for 4250E830-6AC2-11cf-8ADB-00 AA00C00905 this controls GUID. I beleive the value is @='kjljvjjjoquqmjjjvpqqkqm qykypoqjqu oun' If you had these it would be able to be used.
Other cause: alternative is a class written by one of Microsoft employees that more or less mimics MSCOMM as far as the properties and the methods go. The advantages of this class? It is free and you already know MSCOMM.
It was posted on MSDN a while ago. Grab it here another way::: Try going back to your machine and commenting out code associate with the comm control, remove the control, and removing it from the references. Then save the file. Now move the file to the other machine and recreate the reference to the comm control and put it back in the workbook. Then uncomment the code.