Communications :: Reading From Serial Port?
Dec 16, 2008
i am using serial communication to read from a plc.The plc will send a string :&H3A as a header byte then C(which is a variable that contains data)I want to read and mask out the header byte.I use the following code but cannot read anything.
Private Sub btnread_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnread.Click
Msg = SerialPort1.ReadExisting
count = Val(Mid(Msg, 1, 2))
Lblno.Text = count
[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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Mar 8, 2010
For many years, I have sent data between 2 computers using serial ports."Here is the data", "Thank you for that data!" type stuff.Where do I get more information for doing the same thing with 2 computers that are networked together? Assume a local ethernet connection.I have experimented with serial-ethernet modems and that works well but I don't want any more hardware.Is there a good thread here I should read?I want 2 VB programs running and I want to exchange data periodically.
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Sep 21, 2011
I am trying to listen to the COM3 port and display the output in the TextBox. If I understood correctly I will have to implement this by using eventhandlers, delegates. I tried following these articles:
[URL]
And this is the code I came up with... Unfortunately it doesn't display anything. App just starts display "True" and no data is being displayed. I am monitoring Arduino platform which I know is sending data constantly.
Code:
Imports System.IO.Ports
Imports System.Text
Public Class ArduinoSerial
[code].....
I am really new into the vb.net. I am sure there are some horrible mistakes with this code but I am kind of stuck for the past 2 days on this one.
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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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Apr 1, 2009
I am trying to transmit the integer value 360 to serial port. but at micro controller i am getting the 3 bytes (33 36 30) its ASCII Values.So is there any way to transmit the 360's hex value 168 using two bytes only like 01 68 only?
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Jan 5, 2009
I am trying to recieve HEX data from a seriall device. Code is as below . but the required output is not correct. Some chracter code are not correct even in decimal. like for 80 i recieved 3F and for c0 also. for example i recived a string .
10 02 3F 00 10 03 3F 61
but in actual data should be
10 02 80 00 10 03 c0 61
Public Sub DataSeriallReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort.DataReceived
Dim buff As String
[Code].....
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Apr 23, 2008
I'm trying to receive data from the serial port and display onto a text box in my gui in vb. I'm using xp pro sp2 and vb 2008 exp.What i've done so far:
- I'm able to send data successfully (tested) to the serial port
- I can dispaly what data is being sent (tested)
Steps taken:
- I have looked around on this forum for something similar to what I have but no similar posts are here
- Will look into MSDN help shortly
- Will also try some vb books I have lying around. But the problem is most of the vb books deal with sql server and database stuff and not really interfacing to hardware.
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Sep 22, 2008
i have an application where i send data(a question in a "packet" of 8 digits) to an external controller via serial port, and then that controller sends me back some information(the answer, in a "packet" of 8 digits, not necesarily zeros and ones)I have develope a simply software that is getting the correct data form the controller, here it goes:[code]So now i can see how many times the code needs to enter the loop to get the "answer" from the module.Now i know that the code needs to do the loop from 5000 to 18000 times to get the answer each time!!!!, so that is why the software keeps getting freeze.I supose that that time is neccesary for the module to give the answer, so i think i can't get better respond times, but i would like the software not to get halt.
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Jul 4, 2008
I'm writing an app with takes 3 readings off LCD displays via serial ports. The module which scans the serial ports is getting stuck in a loop for around 1.5 seconds. I need it to be much quicker than that. Is there a way I can setup a virtual serial port so I can run test it on my PC. Its very tedious and time consuming of making changes and visiting the machine its for.
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Feb 9, 2011
I have a barcode scanner that beside scanning the barcode it also snaps an image. I wrote a simple application that searching all ports locating in which one the scanner is connected and opening the port.
I can easily read any barcode and the send command to the scanner to pass me the image taken on the port, but i have a problem re-constructing the image from the bytes i read.
Code:
sendCommand()
Dim img(SP.BytesToRead) As Byte
SP.Read(img, 0, img.Length)
[Code]....
I can get the image from the scanner in any format needed (jpg,bmp etc) so no need to provide a precise solution just a general idea.
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May 7, 2011
Now I'm doing a VB project about pc communications to a intelligent instrument with 485 serial port. I want to use API but I'm not good at it.
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Feb 16, 2011
During Serial communications, is the echoing back usually done by the serial port interface or is it done by the UART at the far end?
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Jan 27, 2011
I have a problem with something.I have a Arduino board I wan't to communicate with by serialport.
In "Form1", I'll retrieve values from the Arduino board, and I want it to calculate and display data in TextBoxes.How can I do this?[code...]
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Oct 1, 2009
There seems to be a lot of discussion around about handling exeptions when a USB serial port device gets unplugged. What I want to know is how can one re-attach to it once it is plugged back in. The problem is that if you unplug a USB serial port device the app doesn't know it has gone and remains convinced it is still open. I have to close the app completely before I can re-attach to the device. I need a way to force it to close/go away.
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Dec 1, 2011
I have quite a bit of VB6 experience but now am trying to create my first VB.Net project. The project is very simple - it just needs to send 8-10 character strings from the PC serial port. The problem I'm seeing is that VB.Net is always sending out a 0x0A character after each 'WriteLine' call. Using VB6 it was necessary to manually send out any End Of Line characters. My application requires that no extra EOL characters be sent after the string.
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Nov 11, 2008
i need to create an application where input are to be received by the barcode scanner.However, i am not suppose to use the textbox to do so. However i need to use the serial port to do so. Any one know how am i able to do that?
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Sep 4, 2009
I have a VB.net app running on one computer, displaying text into 2 texboxes or labels.I need to see the two values in two sperate textboxes or labels from the two labels on another computer via a null modem serial adapter.
1st computer.
Code:
serialport1.writeline(label1.txt)
straight forward right?
2nd computer to read the data
Code:
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
dim s as new string = serialport1.readline()
label1.text = s
This is what I was thinking;
Code:
serialport.writeline(label1.text & label2.text
This would send the two values over the serial port. How would I seperate the two values and display them in two different texboxes?cannot use them together)Am I on the right path at all? Or using the serialport.writeline method won't work at all....
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Dec 17, 2008
Anyone else have an issue using read, It appears when I use read it gives me the correct buys but returns the wrong integer value So I use it and it fills the Array i make with &h10, &h6 but read reutnrs number of bytes returned to 1. if there a better way to go with Vb.net with RS232 I mean really my projet dosent have anything out of the Normal
Friend WithEvents CashValidator As System.IO.Ports.SerialPort = New System.IO.Ports.SerialPort("COM1", 9600, IO.Ports.Parity.Even, 8, IO.Ports.StopBits.One)
CashValidator.Read(MyResponce, MyResponceLen, 4)
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Aug 18, 2009
I'm trying to write a bit of code to communicate with an RS232 coin mech.The problem i have is that the coin mech works fine when used with Putty or Hyperterm but i do not appear to be able to 'activate' the serial port with my code.[code...]
When i open the hypertem or putty session the coinmech's active light immediatly comes on and i am able to send and recieve data. When the port is opened with the code nothing happens.
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Apr 12, 2009
I have a USB modem that can detect caller ID and can detect dialled digits when special AT commands activated, How to send and receive data. The sent data will be the AT command such as AT+VCID-1 to activate the caller ID, the received data will be caller ID information and the digits dialed. I'm new to prgramming and using Visual Basic 2008 Express.
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Feb 22, 2008
I am working on barcode reading software. Runs ok, but reads at the most 8 characters at a time. How can I get it to read the entire barcode rather than in pieces?
Here is a snippet of my code
Imports System.Data.SqlClient
Imports System.IO.Ports
Public Class Form1
[Code]....
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Aug 10, 2009
I am trying to open a GPS device on a serial port but no matter what I try I just keep getting an IOException. This is on a pocket PC BTW.
[Code]...
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Oct 22, 2009
For starters I'm using VB 2008 express edition.I have code that writes a string out of a serial port.My issue is that the machine sends data back and I don't know how to catch it.This is my latest attempt at creating an array of characters to create a string later but doesn't work.[code]
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Oct 27, 2009
I am having a little trouble receiving data via the serial port. I can send just fine. I am using Serial Port object.
Basically my data expected is in the form of: [0x43 0x35 0x64 0x35...] broken up into bytes. I tried using the SerialPort.Read() function but can't get it to work.
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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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Mar 2, 2010
I do not have much experience with VB.What I need to do is to read a serialport as a hexadecimal string.I've done this with the MSCommlib, but now want to convert to system.io.ports.The equipment wich is connected to the serialport is a RFID card-reader, so the application haft to detect when it is receveing data, and then continue on.[code]
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Feb 22, 2009
Does reading the serial port empty the buffer?
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May 10, 2011
After searching around I am still having issues with reading data from a serial port in VB.Net/VS2010. I know the Serial Port works, I can write to the port fine but when reading from it, nothing happens. I have only been programming for the last 3 weeks so am still trying to get my head around it all.
[Code]...
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Oct 26, 2011
I have a strange problem. We are upgrading a software that works perfectly in a 32-bits environment.Software have to connect to a serial port (or a virtual serial port) and read data and do wathever it has to do with it. Program uses the IO.Ports.SerialPort object.
Now, under Win7 64-bits, is works well when using "real" serial devices, with a DB-9 connector. But using USB device, with a virtual serial port (provided by the manufacturer), it doesn't work at all. I receive nothing on the DataReceive event. But it works fine on a Win7 32-bits.
Strangely, it also works on the 64-bits PC using a program like realTerm. When connected to the virtual serial port, data are received and it's fine. But from our software, it don't. I don't get anything from the serial port.
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