Communications :: Serialport Data Received Addhandler
Apr 24, 2010
I am writing a small application to see what data I am sending and receiving to my COM port (for a small hardware project based on url..).The problem I want to activate a "Serialread" or "SerialWrite" procedure as soon as data is waiting in the receive or send buffer.I have some basic skills so before I start digging in I would like to get some advice. Can I use a addhandler (I have read something about this on the internet but have to clue how to use it) or something else? Is there a way to check if data is in the buffer ready to be read or write??
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Oct 31, 2008
I want to create a program that will keep track of the amount of (network/internet download) data that has been received, but I have know idea how to go about doing it.Where would be a good place to start with this type of development? Or could some one give me example code that will get me started.
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Jan 27, 2009
how to use the SerialPort in Visual Basic Express?
I have this in the Serial Port Data Recieved event
Code:
SerialText = SerialText & SerialPort1.ReadChar
TextBox1.Text = SerialText
I get : Cross-thread operation not valid: Control 'TextBox1' accessed from a thread other than the thread it was created on. As soon as the event is triggered.
I'd like to display the recieved info in a textbox and transmitt info as well, but I don't know how...
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Feb 17, 2009
I am using VB2008 SerialPort to communicate with a device. My problem is, using RTS handshake I am missing the first 50 or 60 chars, after that everything is intact. I tried to change the buffer size - Has no effect, used standard, bigger, smaller and no change.
The device timing says when it sends CTS signal, it will start listening 100ms after that. I have no clue how to delay the write to test this. Should I first write to the buffer then write to the port after a a 100ms timer event?
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Jun 28, 2009
I am using Visual Basic express to create a serial interface to a multi-room audio controller. I have started by creating a form that can connect to the controller and I can receive data from the Controller and display Zone status, volume etc in corresponding texts box thaks to help from Stanav and Tassa in my previous thread.
My next problem is to do with receiving lots of data from the serial port and my application getting out of sync. This is mainly caused by turning the volum control as each time it is turned a little bit the controller sends out the new status of the Zone being effected
eg
****Turning Volume knob on Zone 1***
Status returned from Controller:
#Z01PWRON,SRC3,VOL05<CR>
[Code].....
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Mar 9, 2011
I built a server to receive data from clients.But how can I know the length of every data package.
Dim bteAcceptData(1024) As Byte
Dim myAsyncCallBack As New AsyncCallback(AddressOf ReceiveData)
intByte = EndSocket.EndReceive(pIAsyncResult)
[Code].....
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Apr 7, 2012
I am constantly receiving 2 lines of data via my serial port, example:
GPRMC, 151243.000 , A, 3723.2475, N, 10354.0208,E,1.26, 290.95, 9.0,,,A*67
GPGGA, 151244.000, 0122.4098, N, 10354.0212, E, 1, 04, 2.1, 71.4, M, 4.3, M,,0000*5F
Apart from the starting 5 alphabets which is the message ID, the other numbers are constantly changing every second. I wish to pick out specific values from these GPRMC and GPGGA and constantly update their respective text boxes, how do I go about doing that?
The 4th, 6th & 8th values of the GPRMC message (in this case '3723.2475' 10354.0208' and '1.26')The 10th value of the GPGGA message (in this case that value is '71.4')
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Jun 13, 2011
how can i split the recieved data to my vb.net application and then save it, so for example whatever starts with e must be appended to a textfile and whatever starts with a must be display in the label.[URL]..
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Oct 6, 2011
the problem I am having is probably mainly because of I am very new at VB.net, anyway, the thing is, I am able to receive data from microcontroller successfully. The format of the data coming from the Microcontroller is shown below
0,2 1023,1023 1023,1023 1023,1023
1,5 1023,1023 1023,1023 1023,1023
2,8 1023,1023 1023,1023 1023,1023
[code].....
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Mar 7, 2012
I develop a simple application usiing VB.NET, VisualStudio 2008, that read input from a serial port
(from another device). I use the class SerialPort.
Using HyperTerminal I can see the input , it's fine. looks like :
S0P,A,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0 S0P,A,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
[Code]...
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Jul 18, 2009
I use the vb .net serialport to receive data from my instrument every second
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Dec 29, 2010
Every 5 to 10 seconds I receive 5-12 bytes of data (confirmed w/Hyperterminal). I can open the com port(btn1), read bytes(btn3) until bytes to read = 0, but then i'm stuck; the data received event doesn't seem to respond. If I close the serial port(btn2), re-open i can read more data until bytes to read = 0 then stuck again. I tried several suggestions for threads and delegate and invoke but none worked. (WIndows XP, VB 2008)
[Code]...
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Apr 6, 2009
I want to use IO.ports.serialport to receive ASCII data from an instrument (A Luxmeter for those interested). So far, i've been unable to read any single byte from the instrument using the IO.ports.serialport.A terminal window shows the datastream just fine, and I've used MScommlib to read the data without problems. I just had other problems with the latter, so I thought I'd give this IO.ports.serialport a try.The code runs fine, no errors. It just doesn't receive anything.Bytestoread stays 0 forever.I distilled the code to it's bare essence. What am I missing? Is it something obvious, or did I completely misunderstand the whole concept? (Which is not unlikely..)I did check the obvious, of course: settings, baudrate, cable is connected, instrument is sending, etc.[code]
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Feb 24, 2011
I am trying to communicate to a local AS3 Air app on my PC via sockets. The VB.Net app is acting as a server in this case while the Air app is a client. The .Net app sends data every 25ms to the Air app. I have not send any message termination. I just receive the data on Air app and process it.
[Code]...
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Feb 22, 2009
I have the following code that listens to a serial port and writes the incoming data to a listview control (the serial data are a delimited string taht arrives once per second that I parse into separate listview subitems). I would like to be able to close/disconnect the serial port once a specific value in the incoming string is detected. For example, in this case one of the columns of data in the incoming string represents depth, I would like to close the serial port when the depth falls below a given number. I have tried the code below, but my program crashes on the SerialPort.CLose method.
dim m_strOBS() as string
Private Sub SerialPort_OBS_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) _
[code].....
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Nov 10, 2010
I am current using VS2008 to write a little app to transmit hex data via the serial port to the target device and receive back data from it and display that on a text box.
The problem i am facing is receiving "read" data "hex" back from the serial port and displaying it. I am able to send data to the target system without any problem. For example, if i send this command "&H10, &H0, &H1, &H7E, &HFF, &H49" The LEDs on the system blink 10 times and it works every time. If i send this command "&H10, &H0, &H0, &HFF, &HD" i should get 5E back and I use Realterm to verify the communication and it works great. When i use my VB app it fails, instead of getting back 5E.I get "&H35, &H45, &HD, &HA" on the buffer
Private Sub sendbutton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles sendbutton.Click
Dim send_Buffer() As Byte = {&H10, &H0, &H0, &HFF, &HD}
[Code]...
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Oct 1, 2009
I am writing a program to read data from the serial port using the data received event. But, I realised that My data received event run more than 1 time when there is a data received at the com port and this actually makes my reading command reads the wrong data. The correct procedure is whenever I send a "+++" over to my device. It should responses with "OK."message.
Why the DataReceived Event will read more than 1 time?
Below is my coding for your reference.
Public Class ControlProgram
[code].....
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Dec 20, 2009
Is it possible to monitor how much traffic my application has used? I'm interested to see how much data that has been sent and received over the internet from/to my own vb.net application.
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Oct 14, 2009
I have a program where I need to periodically save the data to a database (if the computer suddenly shutdown) and also send the same data to a serialport.Alla data that is going to be sent and saved resides in two classes.his needs to be done every 1/10s.What's the best way to manage this?
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May 24, 2010
I'm having a bit of an issue receiving a stream of serial data and displaying the data real-time in my GUI. I am fairly new to VB.Here's what I'm trying to achieve: I have an I2C device (bank of LED's) connected to my Arduino. Using the VB.NET (2010) GUI I request which LED I want on (via buttons) and the I2C device then sends a reply confirming which LED actually turned on (basic feedback). Ok, sounds great right? Here's where I get issues. Well when I try to read the serial data sent to VB and display the real-time stream on the GUI, a) I get a bit of a mess as an output (values are ok, just spewn across GUI) and b) when I select a new LED to turn on, the GUI data does not refresh to this change. The stream being sent from the Arduino is ok, I looked at the data in a serial monitor.
[Code]...
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May 5, 2011
How do I send XML commands in vb to get data received over a serial Port?
I know the commands I'm just not sure how to send them.
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May 17, 2010
I don't know why this is. I am using VB 2008.net and I am trying to receive data on the serial port.
For some reason, the following event is not executing. Here is the
[Code]...
Just simple as of right now for debugging purposes. I have a breakpoint at getMe and it doesn't hit it at all. I know for sure that the serial port should be receiving data as I am using RealTerm to monitor serial port input data before I run my program.
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Oct 17, 2011
I have a USB device which creates a Virtual Serial Port on Windows. I am using VB.Net to write and read from the port. My device responds with specific sized set of bytes, but I am finding that SerialPort.Read(byte-array,offset,number-bytes) does not return the full number-bytes but it also does not timeout or generate an exception. Repeated calls return additional fragments (up to 3 calls required). Python code using pySerial does not have the same problem.So, what am I doing wrong here? Am I expecting too much?
Some scenarios are:I write a command to the port and expect to get 4 bytes in response. I get 1 byte first and then 3 bytes on the subsequent call.I write a command and expect 21120 bytes in response. I get 1, 12671 and then 8448 bytes in 3 calls to read from the port.
Here are some excerpts from my code:
Private Sub SetupVirtualSerialPort()
Dim portName As String = "COM" + (m_DeviceContext * -1).ToString
Const baud As Int32 = 9600 '7680000
Const parity As Parity = parity.None
[code]....
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Aug 17, 2009
I'm trying to make a simple Class that reads data from a SerialPort.The Device returns a number of lines of Strings.[code]However running this code in a Form with one TextBox Control (txtLog) Allways results in the "The operation has timed-out." Exception.[code]
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Oct 2, 2009
I am trying to write something through serial port to my device. Before that, I added the data received handler to read the data when the device response with some data. The problem now is how can i check the status of the data received event? I need to know when the data received event has started or has ended before I can proceed to do some other task like check if the result is successfully receive.
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Jun 4, 2010
I'm doing a project and want to do a graphical interface using V. Studio 2010. I want to use VB.NET as a programming language.
- Do I have to add any software to define VB.net?
- What is the function that reads the data from the serial port?
- If I want to receive more than one type of data, and I want to put/read them in separate text boxes, what is the function to filter the incoming data?
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Jan 5, 2011
I have a TCPListener demo setup and working. The demo program has been supplied by Bill Chung, here:[URL]..the Listener uses a DataGrid to output whatever data is received but currently it doesnt store it.
Ive created a simple database and linked it to my project. what i need help with is getting the data that is currently outputted in the DataGrid to be stored into my DB table.
[Code]...
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Jan 23, 2011
How can i monitor the HTTP data (headers including raw html data) that is sent and recieved while a user browses with a web browser control in my application?
is there some way to capture the connection itself into a socket?
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Nov 24, 2010
I am writing a serial application using VB .net Framework V4 , where I use a background worker to Read a file and send it to a serial port using SerialPort1.writeLine method. The BackgroundWorker1.ProgressChanged Event handler sub Updates the Line Number to a TextLabel and adds each line sent to a RichTextBox using RichTextBox1.AppendText() method on main form (Form1).
The problem arises at 115200 Bauds (and higher),may be because now the text is updated real fast on the form an unhandled Exception in BackgroundWorker1.ProgressChanged Event handler sub occurs. Otherwise at lower baudrates ex: 9600,19200 etc. Application Runs Perfectly Fine.
[Code]...
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Sep 5, 2009
i want to receive data to my pc from external hardware but i don't know how to do it since i am new to vb.net. the code in vb.net to receive data using serial port rs232.
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