Solved

MSCOMM Garbage Data Returning on .Input Event

Posted on 2010-08-23
2
820 Views
Last Modified: 2013-11-27
I am using Visual Studio (VB.NET) 2003 to build a very simple application that uses an MSCOMM control to connect to a serial port MSR card reader.  The code is supposed to open the port and wait for a card swipe through the card reader.  Everythign works fine right now, but the data getting returned is all garbled and I am trying to figure out where I went wrong with reading the data.  

The code snippet is attached allong with a print screen of the information getting returned in a message box.

The card that is returning that data should be returning the following instead:

;013035101515158731?

I am very new to MSCOMM so this could be just a setting I have set wrong or something like that, but the fact that the port is opening and returning data makes me believe that the connection settings are correct.

Any help is greatly appreciatd!

 Swipe-Results.doc

 
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        AxMSComm1.PortOpen = True
        If Err.Number = 0 Then
            MsgBox("Open communication!")
        Else
            MsgBox("Error opening COM port. Please verify MSR is set to COM Port 3.")
        End If

        Exit Sub

RegError:
        MsgBox("Error locating ODBC connection. Please verify ODBC connection has been created.")
        End
    End Sub

    Private Sub AxMSComm1_OnComm(ByVal sender As Object, ByVal e As System.EventArgs) Handles AxMSComm1.OnComm
        Dim InBuffer As String

        Select Case AxMSComm1.CommEvent
            Case MSCommLib.OnCommConstants.comEvReceive

                InBuffer = CStr(AxMSComm1.Input)

                Call HandleInput(InBuffer)
        End Select

    End Sub

    Sub HandleInput(ByVal InBuffer As String)
        ' This is where you will process your input. This
        ' includes trapping characters, parsing strings,
        ' separating data fields, etc. For this case, you
        ' are simply going to display the data in the TextBox.
        txtOCR.Text = InBuffer
        MsgBox(InBuffer)
    End Sub

Open in new window

0
Comment
Question by:Supergrov
2 Comments
 
LVL 41

Expert Comment

by:graye
ID: 33558739
Just guessing... but have you set the following properties:
AxMSComm1.RTSEnable = True
AxMSComm1.DTREnable = True
 
0
 

Accepted Solution

by:
Supergrov earned 0 total points
ID: 33577929
They are both set to true.  I have reverted back to converting the swipe hardware to act as keyboards and am going through that process.  Thanks for the suggestion.
0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

It seems a simple enough task, yet I see repeated questions asking how to do it: how to pass data between two forms. In this article, I will show you the different mechanisms available for you to do just that. This article is directed towards the .N…
More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question