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MsComm Question

Posted on 1998-06-08
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Last Modified: 2008-03-17
I'm trying to use Mscomm control in visual basic and the
problem that i am having is that the modem is not
"letting go" after i place a call.  the code is simple
i use
mscomm1.commport = 2
mscomm1.settings = "9600,n,8,1"
mscomm1.portopen = true
mscomm1.output = "ATDT 5551212" & vbcr
mscomm1.portopen = false

...
This works fine for the first call however when i try to
make another call "even after shutting down the program"
it just runs through the code and does not dial.  
So i go into my terminal program "Telemate" and when i start
that program i can see strings of garbage coming from my modem
until the program initializes it.

So i'm missing a command let me know if anyone knows which one
it is.
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Question by:jtjcomp
  • 2
3 Comments
 
LVL 9

Accepted Solution

by:
Dalin earned 50 total points
Comment Utility
jtjcomp,
You need to send a stop string to the modem when you finishes.
Comm1.OutOut = "ATH0" & Chr(13)
Wait tell the modem dtops, then close the port.
Any questions, let me know
Regards
Dalin


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by:jtjcomp
Comment Utility
I have tried that and it did not work, however i did not wait to close the port. but since i issued the hang up command shouldn't it have hung up regardless of the port status.
thanks in advance..
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LVL 9

Expert Comment

by:Dalin
Comment Utility
jtjcomp,
This is some woring code.
You can see if it works for you. You need to pass the number to the routine.
Regards
Dalin

Private Sub Dial(Number$)
    Dim DialString$, FromModem$
    Dim StopString As String
    Dim Delay As Double

    '--- AT is the Hayes compatible ATTENTION command an is required to send commands to the modem.
    '--- DT means "Dial Tone" - The Dial command, using touch tones as opposed to pulse (DP = Dial Pulse)
    '--- PhoneNumbers$(Index) is the phone number of the person you're dialing
    '--- A semicolon tells the modem to return to command mode after dialing (important)
    '--- A Carriage return, Chr$(13), is required when sending commands to the modem.
    DialString$ = "ATX4&D2DT" + Number$ + ";" + Chr$(13)
    StopString = "ATH0" + Chr$(13)
    '-- Comm port settings
    Comm1.Settings = "300,N,8,1"
   
    '-- Open the comm port
    On Error Resume Next
    Comm1.PortOpen = True
    If Err Then
       MsgBox "COM1: not available. Change the CommPort property to another port."
       Exit Sub
    End If
   
    '-- Flush the input buffer
    Comm1.InBufferCount = 0
   
    '-- Dial the number
    Comm1.Output = DialString$
   
    '-- Wait for "OK" to come back from the modem
    Do
       DoEvents
       '-- If there is data in the buffer, then read it.
       If Comm1.InBufferCount Then
          FromModem$ = FromModem$ + Comm1.Input
          '-- Check for "OK"
          If InStr(FromModem$, "OK") Then
             '-- Notify the user to pick up the phone
             FromModem = ""
             Beep
             MsgBox "Please pick up the phone and either press Enter, or click OK"
             Exit Do
          ElseIf InStr(FromModem$, "NO DIAL TONE") Or InStr(FromModem$, "NO DIALTONE") Then
             FromModem = ""
             Beep
             MsgBox "Dialtone not detected.  Please check the telephone connection."
             CancelFlag = True
             Exit Do
          End If
       End If
       
       '-- Was Cancel pressed?
       If CancelFlag Then
          CancelFlag = False
          Exit Do
       End If
    Loop

    '-- Disconnect the modem
    Comm1.Output = StopString
   
    '-- Close the port
    Delay = Timer
    While Delay + 1 > Timer
        DoEvents
       '-- If there is data in the buffer, then read it.
       If Comm1.InBufferCount Then
          FromModem$ = FromModem$ + Comm1.Input
       End If
    Wend
    Comm1.DTREnable = False    'belts and suspenders
    Delay = Timer              'disconnect.  If StopString
    While Delay + 1 > Timer    'worked, this isn't needed.
        DoEvents
    Wend
    Comm1.DTREnable = True
    Comm1.PortOpen = False
End Sub
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