Serial-port-vb.doc 1 2/1/2010 Serial to read from and write to the hardware port. Hardware serial ports with their 9-pin D VB.net Code The serial port.
This function controls the writing to the com port. I choose to write one byte at a time to the As i was reading your post on COM Port Made Simple with VB.NET.
Serial Port Communication In VB.Net - VB.NET Tutorials | Dream.In.Code
I need to be able to write signed bytes to a serial port using SerialPort.Write method, how would i write a signed byte to the ser.
Welcome to my tutorial on Serial Port Communication in VB.Net. Lately Ive seen a lot of questions on how to send and receive data through a serial port, so I thought it was time to write on the topic. Back in the days of Visual Basic 6.0, you had to use the MSComm Control that was shipped with VB6, the only problem with this method was you needed to make sure you included that control in your installation package, not really that big of a deal. The control did exactly what was needed for the task. We were then introduced to .Net 1.1, VB programmers loved the fact that Visual Basic had finally evolved to an OO language. It was soon discovered that, with all it's OO abilities, the ability to communicate via a serial port wasn't available, so once again VB developers were forced to rely on the MSComm Control from previous versions of Visual Basic, still not that big of a deal, but some were upset that an intrinsic way of serial port communication wasn't offered with the .net Framework. Then along comes .Net 2.0, and this time Microsoft added the System.IO.Ports Namespace, and within that was the SerialPort Class. DotNet developers finally had an intrinsic way of serial port communication, without having to deal with the complexities of interoping with an old legacy ActiveX OCX control. One of the most useful methods in the SerialPort class is the GetPortNames Method. This allows you to retrieve a list of available ports (COM1,COM2,etc.) available for the computer the application is running on. Now that we have that out of the way, lets move on to programming our application. As with all application I create, I keep functionality separated from presentation, I do this by creating Manager classes that manage the functionality or a given process. What we will be looking at is the code in my CommManager class. As with anything you write in .Net you need to add the references to the Namespace's you'll be using: If you will read my tutorial on Serial Port Communication in C# you will see the same exact functionality that is in the DisplayData method, except in VB.Net, as pointed out earlier, requires the AddressOf Operator to reference a method to act as the delegate.The next method we will look at it used when we need to open the port initially. Here we set the BaudRate, Parity, StopBits, DataBits and PortName Properties of the SerialPort Class: #Region "OpenPort" Public Function OpenPort() As Boolean Try 'first check if the port is already open 'if its open then close it If comPort.IsOpen = True Then comPort.Close() End If 'set the properties of our SerialPort Object comPort.BaudRate = Integer.Parse(_baudRate) 'BaudRate comPort.DataBits = Integer.Parse(_dataBits) 'DataBits comPort.StopBits = DirectCast([Enum].Parse(GetType(StopBits), _stopBits), StopBits) 'StopBits comPort.Parity = DirectCast([Enum].Parse(GetType(Parity), _parity), Parity) 'Parity comPort.PortName = _portName 'PortName 'now open the port comPort.Open() 'display message _type = MessageType.Normal _msg = "Port opened at " + DateTime.Now + "" + Environment.NewLine + "" DisplayData(_type, _msg) 'return true Return True Catch ex As Exception DisplayData(MessageType.[Error], ex.Message) Return False End Try End Function #End Region We have 3 small methods left, and these are actually optional, for the lack of a better word. These mthods are used to populate my ComboBoxe's on my UI with the port names available on the computer, Parity values and Stop Bit values. The Parity and Stop Bits are available in enumerations included with the .Net Framework 2.0: #Region "SetParityValues" Public Sub SetParityValues(ByVal obj As Object) For Each str As String In [Enum].GetNames(GetType(Parity)) DirectCast(obj, ComboBox).Items.Add(str) Next End Sub #End Region #Region "SetStopBitValues" Public Sub SetStopBitValues(ByVal obj As Object) For Each str As String In [Enum].GetNames(GetType(StopBits)) DirectCast(obj, ComboBox).Items.Add(str) Next End Sub #End Region #Region "SetPortNameValues" Public Sub SetPortNameValues(ByVal obj As Object) For Each str As String In SerialPort.GetPortNames() DirectCast(obj, ComboBox).Items.Add(str) Next End Sub #End Region That is how you do Serial Port Communication in VB.Net. Microsoft finally gave us intrinsic tools to perform this task, no more relying on legacy objects. I am providing this class and a sample application to show how to implement what we just learned. What I am providing is under the GNU General Public License meaning you can modify and distribute how you see fit, but the license header must stay in tact. I hope you found this tutorial useful and informative, thatnk you for reading. Happy Coding SerialPortCommunication_VBNet2.zip (223.7K) Number of downloads: 37364 Serial Port Communication in VB.Net Example Thank you for these useful code example. these what Iam training myself now . but the source file will not open. It appears the zip file is corrupted Please verify that the file is not corrupt Serial Port Communication in VB.Net Example Thank you for these useful code example. these what Iam training myself now . but the source file will not open. It appears the zip file is corrupted Please verify that the file is not corrupt Its not corrupt just use 7 zip its tripple packed. Serial Port Communication in VB.Net Example Thank you for these useful code example. these what Iam training myself now . but the source file will not open. It appears the zip file is corrupted Please verify that the file is not corrupt Its not corrupt just use 7 zip its tripple packed. I really am trying to use the serial port in VB.net and wanted to play with this code, I found and downloaded 7 zip. But as others have stated when it is unzipped, I don't have a clue what to do with it. I know this has been asked before, but can someone detail what has to be done to get this file to work using 7 zip? This would be greatly appreciated!
Hello, I am building this application for smartphones using Vb.net basically what I am trying to is to send data to a serial port. The serial port will.
When we write VB.Net code for Web form the web application can be Is There Something You d Like To See Covered In VB.Net; Serial Port Communication With VB.Net.
COM port made simple with VB.NET - CodeProject
Introduction This article is about controlling the com port in windows. You can't just tell the computer to open the com port like you would with Pascal or C++ in DOS. But there are still some tricks that makes it possible to open and use the com port. The only thing is, you will need to know something about windows - Win2k has a HAL (Hardware Abstraction Layer). First of all, windows 2000, windows xp and windows 2003 have protected hardware access. This is the HAL. Very useful when it comes to security, but for programmers like me it's a nightmare. I found a solution: Let windows do the job for you. How did I make this? I used some basic windows function for my com port controlling functionality: You can find these functions in the old VB6 API Viewer program (Or you might take a look in the source of course). I simply told windows to do the hardware controlling for me. I will trick my program that the com port is a file. This is made possible through the Windows API Functions I use. The code The first function of my code is the open function. The function will be trying to make a com port handle. After that I check if the handle is correct. If the handle is ok, I will continue by making a DCB Structure instance ready for use. With this structure we can control all comport settings. (I will only use, speed, parity, stop bits and data bits) Public Sub Open(ByVal portname As String, _ ByVal Spd As Integer, ByVal Pty As enumParity, _ ByVal Dtb As Integer, ByVal Stp As enumStopBits) Dim m_CommDCB As String Dim m_Baud As String Dim m_Parity As String Dim m_Data As String Dim m_Stop As Byte hPort = CreateFile(portname, GENERIC_READ + GENERIC_WRITE, _ 0, 0, OPEN_EXISTING, 0, 0) If hPort < 1 Then Throw New Exception("Can't open the comport! (Errorcode :" _ & GetLastError().ToString() & ")") End If m_Baud = Spd.ToString() m_Parity = PARITYSTRING.Substring(Pty, 1) m_Data = Dtb.ToString() m_Stop = Stp m_CommDCB = String.Format("baud={0} parity={1} data={2} stop={3}", _ m_Baud, m_Parity, m_Data, m_Stop) BuildCommDCB(m_CommDCB, dcbPort) If SetCommState(hPort, dcbPort) = 0 Then Throw New Exception("kan de compoort niet openen(" & _ GetLastError().ToString() & ")") End If m_opened = True End Sub The next function is the Write Function. This function controls the writing to the com port. I choose to write one byte at a time to the com port since I wanted to control a microcontroller with my com port. But you can change this of course to a multi-byte write function or add an extra function for multi-byte. Public Sub Write(ByVal data As Byte) Dim dt As Byte() Dim written As Integer dt(0) = data 'We have a multi-byte buffer, which you can of 'course enable... If Opened = True Then WriteFile(hPort, dt, 1, written, Nothing) Else Throw New Exception("Comport not opened") End If dt = Nothing End Sub Of course I also want to read from the com port. This is achieved by the read function. For this function the same story as for the Write function with the multi-byte add-on. Public Function Read() As Byte Dim rd As Integer Dim ovl As New OVERLAPPED Dim dt As Byte() dt = Array.CreateInstance(GetType(Byte), 1) 'Initialize the buffer If Opened = True Then ReadFile(hPort, dt, 1, rd, ovl) Else Throw New Exception("Comport not opened") End If Return dt(0) End Function At last and more important than the open function we have the Close function. This function closes the com port and releases the system handle to it. If we don't do this in NT4/win2k/xp/2003, we get big problems. Public Sub Close() CloseHandle(hPort) hPort = -1 m_opened = False End Sub Conclusion I hope my english wasn't too bad and my explaination not too chaotic. But above all, I hope you have fun with my com port driver ! i'm trying do somthing I think should be varey simple. I don't no any code at all but simply put all I want to do is chose a key on my keyboard when it is pressed it should activate the rts pin 7 of the com port witch would light up a Optocoupler circuit like the one in the link bellow. I do have a nice little program that will kinda do what I want. the program is a mores code program called cwtype however I want the option of also adding a sound card interface so I can use my computer for a vocal proccesor over a ham radio. http://www.qsl.net/sv1hao/Schematic1.htm[^] a more advanced aproch would be to set up two keys one to key the circuit on rts pin 7 and another to dtr on pin 4. this would allow a ptt key and a cw key to be used. and above and beond a key lock down that could be clicked to lock ither of the cicuits in the active ptt mode for long cw transmitions. if anyone is interested in helping me fumble my way into this code adventure, offer advice, or write some code for me please any help would be great. and bare in mind I've never done any code except html. Hello FLAVIO, As i was reading your post on "COM Port Made Simple with VB.NET", i wanted to know how would you go about doing the "Public Sub Read()" function? you have provided the "wirte function", i would be grateful if you can provide me with the "Read" function that helps read strings instead of raw data as soon as possible. Regards, Husam Email: [email protected] Husam Othman
RESOLVED SerialPort VB.NET : Write/buffer/timing and Data Received Event That would be open the serial port, configure / start the backgroundworker.
At the end to specify the Loop of SerialPort.Write I would set the serial port to RequestToSend SerialPort VB.NET : Write/buffer/timing and Data.