Detecting A Serial COM Port?

Nov 9, 2009

I am developing a UI for an embedded device that I have designed and built.  The device uses an FT232 chip which, when connected via USB is automatically assigned one of the COM ports.  I was wondering if there is a way to set up a loop which would automatically detect which COM port the device has been assigned.  I could then add some handshaking to verify that the port is correct.


Reading Serial Port Read Data From Serial Port?

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


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Serial Port Example Code - Connect To A Modem Thru The Serial Port

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?


Note: the error: not CLS-Compliant

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Unable To Close Serial Port After USB / Serial Converter Disconnected

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.


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Read The Data From Barcode Weight Scales By Serial Port And TcpIp Port?

Nov 27, 2010

I'm mohammed from Oman ,I'm visual programmer How I can Read the Data From Barcode Weight scales By Serial port and TcpIp port

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Get FullName From Available Serial Port (Com Port) From Device Manager In Windows Form With .net?

Jul 25, 2011

I have a Windows 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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The Given Port Name Does Not Start With COM/com Or Does Not Resolve To A Valid Serial Port?

Aug 2, 2011

If I uninstall the COM1 and reboot, it works. If I shut down (power off) and restart, I get the message below. If I uninstall then click on Scan for Hardware Changes,The given port name does not start with COM/com or does not resolve to a valid serial port. Parameter name:portName

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VS 2010 Detecting AT Command Port(s)?

Apr 22, 2012

looking for a way to detect all available AT Command ports on connected USB Mobile Modems.

I've tried messing with WMI a bit, but was only able to detect the HSBC ports, not the AT Command Ports which is nessassary to issue AT commands to the modems.

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Communications :: Serial Port - Run Program, "Access To The Port 'COM1' Is Denied"?

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?


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Serial Port Use In A DLL?

Jun 3, 2012

I am trying to buld a DLL in VB.NET 2010 that will be use to control a vending machine.Whin a call into the DLL to a function to open and setup the comport the first time its opens it just fine, but if a call into the DLL again it does not know that the port is open even if it is still open. I can check with another program and is shows the port is open and if I try to call into the DLL again to open the port I get an error that the port is already open. Any idea how to set this up so it will work

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.net - Serial Port Communication?

Dec 30, 2009

i'm creating a windows form to send/receive data to/from serial port.At first : i send the data as string to the serial port .Second: i tried to read the string again for test the successfull transmission , but i recieved empty string


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Accessing The Serial Port?

Oct 21, 2011

I can find documentation (preferably with code samples) that will guide me through all the steps to activate and read from a serial port?

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BreakState Serial Port In CE6.0?

Oct 31, 2010

For my application a need to set a breakstate on/off of 25ms.In Xp this runs fine when I set breakstate=true and wait for 25ms and then breakstate= false and wait 25ms.In CE6.0 when I set breakstate = true, it only throws a puls.It is even not possible to keep breakstate on.

how to solve this or is there an alternative to simulate a breakstate?

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Communicate To Serial Port?

Jan 15, 2011

can we communicate to Serial port COM1 through Microsoft Robotic Studio?We are developing wireless robot which will take data from serial por

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Communications :: Like A Serial Port

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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Controlling The Serial Port?

Apr 23, 2006

I know things have changed in and i have Express and i want to controll the serial port. I have a program from VB6 that i understand and i tried to convert it but i get alot of errors and i have know idead what they mean. As you can tell i haven't been programming very long.

If someone can point me in the right direction for programming the serial port in VB2005 .net i would appreciate it or tell me what differences there may be.

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Get The Serial Port Available In The System?

Feb 16, 2009

I have a little code for get the serial port available in the system.

For Each pn As String In IO.Ports.SerialPort.GetPortNames
Debug.WriteLine("NAME : " + pn.ToString)


So, The PORT1 and PORT5 its ok (because this are real serial port, with a real RS232 interface), but PORT4, I don't know.

How I can do for get only true serial ports ?

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Getting Data From Serial Port

Jan 30, 2011

I am facing problem reading data from Serial port. Actually I am connecting with the hardware device called Crimp Force Analyzer. It gives the data on hyperterminal and I have to read that data from my <acronym title="Visual Basic">vb</acronym>.net program. The data is somewhat like this:


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Graph A Serial Port?

Oct 29, 2009

I'm looking for a program that would read and import data from my serial port and then graph it. I don't mind buying it if it's not a free program.

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How To Read Serial Port

Oct 27, 2009

i am new to and i am writeing a program to read a serial port and if there is any thing in the buffer i want to read the data and put it in a string then clear the buffer

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How To Read The Serial Port

Jun 22, 2010

Ive got a big problem.I need to read data from the serial portIve used serialport from the toolbox , but dont know how to use it.I used to do it on a Amiga like this

open serial("serial.device".0.2400.0) rem(open port)
repeat GW.w=readserial(0)
if gw>29 and gw<128


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Interfacing With Serial Port?

Jan 21, 2009

I am trying to interface with a Sylvac Gage over the Serial Port, but I can not get read any information sent by the gage.I am using the IO.Ports.SerialPort Object (called serialPort), and I can successfully write to the device. I can tell it to turn off by: serialPort.Write("off" & vbCrLf)But I can't seem to get any information back from the Gauge when I ask it to send information serialPort.Write("?" & vbCrLf)


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Listening To The Serial Port?

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:


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.

Imports System.IO.Ports
Imports System.Text
Public Class ArduinoSerial


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Open All Serial Port?

Jun 9, 2011

how to open all serial port in i know how to open by getportname..but how to open all??can we do it?

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Printing To A Serial Port?

Aug 31, 2011

how difficult is it to print to a serial port?or will windows "find" the printer?

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Reading From A Serial Port?

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


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Receiving Sms Using Serial Port?

Aug 5, 2009

I don't really quite understand how the receiving works but could anyone please help me on how does the receive sms works when using serial port and AT-commands? Here is how I use my code:

Imports System.Windows.Forms.Form
Imports System.Text.Encoding
Imports System.Threading
Imports System.IO.Ports


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Receiving The Sms From The Serial Port?

Jun 28, 2010

I am doing a project on receiving the serial port. but the problem is that I am a lost now because I am in the dead end because my project is near the dateline. I am at blank now. Can anyone help me to teach me step by step on how to do the part on receiving sms using the modem?

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Serial Port - String To Hex

Nov 14, 2011

I m writing serial port program i can send hex data without any problem but i stuck when I get response in buffer for example response is a string "?-??"


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Serial Port - USB Crash

Apr 20, 2010

There is a bug report [URL] on serious problems that can occur if you are using a USB to serial port converter and the user pulls the USB while the serial port is in use. Apparently the bug is still present in VB2010, and Microsoft still has the bug closed.

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Serial Port In VB 2008

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.


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Serial Port Not Receiving?

Sep 19, 2011

If I touch the Power & Send wires together on a serial cable the program needs to count up by one. It is just acting as a counter is all.I have some code, but I cannot get it to count....It doesn't even appear to be getting to the SerialPort1_DataRecieved event....ok at this and see what I'm missing? I'm using VB 2010 Express. The serial port properties are all left at default.

Public Class frmMain
Private Sub frmMain_FormClosing(ByVal sender As Object, ByVal e As


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Using A Serial Port In A DLL With .NET 2010?

Jun 3, 2012

I am trying to buld a DLL in VB.NET 2010 that will be use to control a vending machine.Whin a call into the DLL to a function to open and setup the comport the first time its opens it just fine, but if a call into the DLL again it does not know that the port is open even if it is still open. I can check with another program and is shows the port is open and if I try to call into the DLL again to open the port I get an error that the port is already open. Any idea how to set this up so it will work.

I need to open and config the com port in one call that leaves it open and then in other call use the com port to talk the equipment in the machine without closing the com port untill it is required to close it.

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Using Two Serial Port For Communication

Feb 9, 2009

I am using two serial port in my programm.What is want is, i need to receive data from one port and send on another port and vice a versa.This code receive data from one port but can't receive data from another port. I have tried to simulate this code by using hyper terminal and it works properly with both com port. Where as i have written code in Vb6 too and its is giving same problem as giving interupt while recieved data from one port but not giving interupt which receiving from another port. I know the another way to receive data is by using timer and read data by command as readline(), but what to do to make both the port gives interupt which receive data.Please help to find out the porblem, the code is in and it is as under.[code]

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Writeing Hex To Serial Port?

Mar 11, 2010

i have written a small program to control a camera through rs485 now the program works ok for one camera but i dont seem to be able to change the byte that changes the camera number at run time through a drop down menu ie cam 1 cam 2


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.net - Can't This Code Open A Serial Port?

Sep 1, 2010

Public Class my_class Dim WithEvents COMPort As New System.IO.Ports.SerialPort

Public Sub FindReader()
Dim ports As String() = IO.Ports.SerialPort.GetPortNames()
Dim port As String
For Each port In ports


When it runs, it shows a single COM port "COM1". I am assured that the device attached to it is a standard 8,n,1 and uses 9,600 baud. The exception is "Acess to the port 'COM1' is denied".

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.ost File For Serial Port Control?

Dec 7, 2010

i trying to make a control for serial port to send a string "1" to serial port , but i don't want to use a form. I want to be able to save as .ost file or be able to input it into outlook 2003 macro to use as a script. can someone get me started on how to name, open, set, write to a serial port without using a form? just to use as a macro?

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Access Serial Port In 2008?

May 25, 2008


m really not sure in here because this code is for vb .net 2003.. are they the same?

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Buffering Writes The Serial Port?

Feb 21, 2009

Im trying to buffer data being written to a device on a com port. The equipment attached to it does not use any form of flow contol and if you write to much information to quickly it falls over. So I have had the following thoughts.

I would create a list of strings and when I wanted to write data to the com Port I would just add the string to the list. I would then have a Sub running its own thread to step through the list, write the string to the com port ,pause a fixed amount of time, remove string from list and repeat until the list is empty. Then keep looping the above.

Code I have so far is below

Private MsgList as new List (of string)
Private sub MsgPump ()


THis does work but If I add strings to MsgList to quickly it throws an exception.

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Can't Open A Serial Port For Reading?

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.


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