VS 2008 Serial Port Program Hogging CPU?
Feb 18, 2011
i have the following code which runs ok, but it hogs upto 95% of the CPU.program outline: a timer tick event = 1000ms scans through 30 readlines of data on the comport for a specific line of hex, and then extracts information from the next line and converts it to decimal for viewing on the screen.i've only included the main part of the code to try and keep it simple.
Public Class Form1
Private WithEvents serial As New IO.Ports.SerialPort
Public grab As String
Public cardIndex As Integer
[code]....
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Feb 12, 2009
In Form1 there are a lot of boxes like checkbox, label....I want to show a processing message for opening serial port after program running. So I created Form2 specifically showing "Opening Port...". So in Form1_Load() I used Form2.Show(). However this message showed behind of Form1. I think this was executed before all the other tool boxes loading. So where should I put Form2.Show()?
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Oct 15, 2008
Im having problem with the Serial Port. When i run my program, "Access to the port 'COM1' is denied". What does that mean? Im not sure whats happening because theres no error in my code. Someone suggest me to use 'COM2'. Which is also the same result. I have a microcontroller, programmed and run it. And i need to capture the data onto my vb, which is on a multiline textbox. How to i do that?Just to double check my code?
[code]...
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Aug 16, 2011
i am a absolute beginner and i want to use vb to receive data from micro controller through serial port using rs232 standards, i found this code to receive the data serially, can any one tell me where should i paste this code, so that the data received will be displayed in message box.Private Sub DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) HandlesSerialPort1.DataReceived
[Code]...
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Oct 26, 2011
The link below has code to connect to a modem thru the serial port but it is for an earlier version of VB. when I convert the code, it does not fully convert and has 4 errors that prevent building the project. can someone tell me what needs to be changed or added?
[URL]
Note: the error: not CLS-Compliant
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Sep 6, 2010
I am using Scanpal2 to read data and as per its documentation as follows
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Nov 20, 2011
I have very limited knowledge of any programming and am desperately trying to learn. I am attempting to use Visual Basic to create a simple program to operate our church's projector from the computer. I am able to control the projector using hyperterminal and accessing the serial port. I am wondering how I would code a button to send the correct signal to the correct port? I have a simple setup w/ my church logo in background with three buttons. There is an On, Off and Freeze button. I am simply needing to know how to program the buttons to access the serial ports. I hope I am being clear.
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Feb 15, 2009
I have a VB.Net 2008 app that I have converted from VB6 which reads data from a weight scale connected to a serial port. I am able to read the received data and display it on the screen, but when I go to Stop the reading and attempt to close the serial port, the app hangs.
Private Delegate Sub ShowWeight(ByVal tWeight As String)
Private Sub comScale_DataReceived(ByVal sender As Object, ByVal e
As System.IO.Ports.SerialDataReceivedEventArgs) Handles
[Code]....
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Mar 16, 2009
i want to know how can grip messages come by serial port and create data base to this message ,,,i mean to drop this message to . record to store it and i can use in my program
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Feb 24, 2011
I am supposed to make a software for data logging via serial port but the hardware is expected to be delayed and iam required to continue with the programming of the software. What i need is that by some mechanism i want to send data on serial port (COM port) and after delay of some mili seconds i want to detect that data. I actually want to do this because i want to create environment like my software i intercepting COM port and on receiving data it captures the data values on port and record them to database. I have done most the work, the only thing left which i want is as above how i will send data on COM port (this was to actually to be done by hardware) and detect it in my program (same program from which data was sent). Please guide from where should i start.
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May 18, 2010
I have recently developed a serial port communication program to access my hardware firewall and its connected to the device via a converter usb to rs232head plugged to a rs232 to an ethernet cable. this ethernet cable then plugs into the device console port.
my program functions similar to that of TeraTerm. an opensource hyperterminal program written in C++ but i decided to do one for vb.net
Alright to cut the story short, i have successfully coded out the program to accept incomming data from the device but however, i'm also receiving ansi escape sequence along with it and i have no idea how i could implement codes to remove these. i have spend 3 weeks trying to look for vt100 emulation codes written in vb.net but i found none so far. most are written in c++. here's an image to illustrate the problem which im facing.
The image below is a screenshot taken when the i ran both the programs together. The bottom is tera term 3.1 and the top is my vb project which i made using msdn's example and improved on the codes. basically tera term was able to interpret those escape sequence and display accordingly to that of the vt100 terminal display. I have spent time reading on regular expressions using the inbuilt function regex in visual basic and tried parsing some strings but its not working. i guess its far more complex than i thought.
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Apr 11, 2012
I'm trying to make a rs232 serial data logging program, that accepts a 12 bit hex RFID tagID from an RFID module. My end objective is to save this RFID tagID into a database and assigned to a person for a personnel management system.I had to use button3 to add the value of the variable 'msg' into textbox1 because I was getting the following error "Cross-thread operation not valid: Control 'TextBox1' accessed from a thread other than the thread it was created on". It is a temporary workaround.When I do press button3, I get the incomplete hex number, instead of "4C00A2C82A0C", I get "A2C82A0C", and sometimes I get random digits like 1,A,C etc etc.
Public Sub OpenPort()
Try
If SerialPort1.IsOpen Then
SerialPort1.Close()
[code]....
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Aug 6, 2009
I have a smart card reader/writer hooked up to my serial port. i've already coded the program to give access to the serial port. How would I go about getting my Card Reader/writer recognized in my program. I basically want to click the "read button" and whatever is on the current smart card im trying to read, pop up on the screen.
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Apr 9, 2011
I am trying to make my own hyper terminal. I have used the serial port component and after setting all the configuration for the com port I press the button Enable ComPORT. The problem is that, when I press the enable com port button the program goes unstable untill the reception starts from the COM port. After the reception is start the program starts working fine.
[Code]...
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May 25, 2008
[Code]...
m really not sure in here because this code is for vb .net 2003.. are they the same?
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Oct 2, 2011
I have microcontroller interfaced with serial port of my computer. In my microcontroller I have 2000 sample data and my primary target is to read those data. Now I can read those data in hyper terminal, but when it comes to my application it doesnt show anything.
Private Sub sp1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles sp1.DataReceived
sp1.Open()
MsgBox(sp1.ReadExisting())
End Sub
this simple code block should show me the data.But it doesnt.data format coming Microcontroller is in this following formate :
nitialization successful !,1023
Starting sampling process... 1023,1023 1023,1023
0,2 1023,1023 1023,1023 1023,1023 212,686 1023,1023 1023,1023
1,5 1023,1023 1023,1023 1023,1023,659 213,689 1023,1023 1023,1023
now, I dont understand why it doesn't read anything :NB: SP1 has a baudrate of 19200,Databits 8 and no parity,COM1 port. I aisnt sure whether I will be needing a buffer or not
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Jul 20, 2011
This code was published a few years ago by stanav. I have it reading my Com1 db9 port but having some issues.i have tried adjusting some timeouts, but then, it may just sit there.Jarbled Text - I should be getting results like "SOHEM709US 17946US 1114 US62RST 123456789 201107141703 01 " etc., instead I am getting "3B?B?B?????99?F?F?3B?B?B?CAD?1? ? ?2?8?3?0? ?0?1?6"I/O Error - The I/O Operation has been aborted because of either a thread exit or an application request.
[Code]...
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Nov 18, 2009
All these days i used to program in Vb6.0. Now since from last 15 days I have been using Vb2008. In Vb6.0 I used MSCOMM for serial communications. Here in Vb2008 I found Serial port control equivalent to it. I somehow managed to learn how to send data using serial port control and set parameters like baudrate , stopbits , etc. But I' not getting how to get the received data. In VB 6.0 we used to use comEvReceive in OnComm event and used MSCOM1.Input to get the received data. But I'm not getting how to do the same in vb2008.
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Mar 11, 2010
I have written a sketch to an arduino board to send data to the serial port. How can I tell VB to only read from the serial port when data is sent to it? I have been using the timer.tick and tried to sink it with the delay I set in the arduino
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Aug 13, 2011
the program works fine but there is the possibility of a problem because this error message did pop up.I'm gathering my data bytes in an array --
dim rcvdata(19) as byte
serialport.read (rcvdata,0,20)
serialport.close
(Then decipher the array).But Should I go further with this? Could the error be related to my serialport.read?What if there were NOT 20 bytes read into the array?I think this may be it? I should poll the array for 20 bytes before proceeding?Yes? -- (It's a given and that's standard procedure).No? -- Don't worry, they're going to be there (the read will try again if it has to?) It won't proceed without the 20 bytes?
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Apr 23, 2010
I'm trying design an aplication, who receive inputs from a Photocell omron.
I will connect this photocell at serial port, and it, when detect movement, close the circuit.
How can I verifi in the serial port, if the circuit is closed ou opened?
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Mar 23, 2011
I have created a laser that can be controlled via the serial port. I've written the code to switch it on/off and it works fine. How do i make it strobe? Here's the code to switch it on, to switch it off is similar (don't ask why it is like this...i think it's the transistor from the circuit board that switches the signal):
[Code]...
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Aug 22, 2009
seems to be quite easy but i'm stuck I'm reading a hex string from serial port (f.e. 20FD05C4), but can't read it proper in VS:/ . I've been trying with serialPort.ReadExisting(), serialPort.Read, etc
Is there any way to just read that String or convert it easyly bin/hex ?
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Dec 8, 2010
I've set up two computers, with a null modem serial cable. When trying the connection in two Realterm windows it works ok to send strings.I'm trying to write a simple project that sends the timestring over the same port.One button sends the timestring. I've created one other sub "AppendLabel" that just updates a label.text so I can see what's happening.[code]
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Nov 3, 2011
Till drawer, connected to Com1, 9600,0,N,1 and a windows forms appThe drawer uses the RI line to show if the drawer is open or closed, but I cant find a way to read this line from the SerialPort control.. Been working on this for a while, but no dice!
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Jun 9, 2009
I have an application in Electronics to communicate with serial port. With using VB I have succesfully read a character using
Serialport1.ReadByte
or
Serialport1.ReadChar
[code].....
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Mar 12, 2009
In my serial port application, I have my code -
Private Sub SerialPort_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort.DataReceived
Dim cnt2 As Byte
[code]....
For some packets I sent, "Error Data Received" came up. I checked BytesReceived, it was 0. My question is: since SerialPort_DataReceived processes data received, data was supposed to be received. Why the number of bytes I read was zero? BTW, when is this event accessed? it is accessed when any number of bytes received or the whole packet received?
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Mar 28, 2006
I have a stand alone VB.Net 2005 application that uses a serial port that generally stays open while the application runs on a Windows XP system. In trying to bullet-proof the UI, I ran into a problem when the USB to Serial Converter normally used to provide the serial port is disconnected while the serial port is open. In trying to handle the resulting error when accessing the port, I find I cannot close the port.
When trying to do so, the error message says something like "unable to close the port. You may not have sufficient permissions." Reconnecting the USB/Serial Converter does not reactivate the port.
[Code]...
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Nov 27, 2010
I'm mohammed from Oman ,I'm visual studio.net programmer How I can Read the Data From Barcode Weight scales By Serial port and TcpIp port
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Jul 25, 2011
I have a Windows form.in windows form have a combo box that give me a list of available port serial with it code (Dim ports As String() =SerialPort.GetPortNames())for example( Com1,Com8,Com15,...).but I want to give me fullname of serial port in device manager for example in dvice manager is these (Comunication Port(COM1) - Printer Port(LPT1) And USB Serial Port(COM8)).how to Get it?
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