print to usb port using vb6

Hi,

I've got a zebra tlp 2844 conected to a usb to parallel converter. to print to a standard ltp port I use the following code: -

Private Sub Command1_Click()

Dim label_String As String

Open "LPT1" For Output As 1

    label_String = Chr(10) & "N" & _
    Chr(10) & "ZB" & _
    Chr(10) & "R310,0" & _
    Chr(10) & "A50,2,0,3,1,2,N," & Chr(34) & "STD 512Kb" & Chr(34) & _
    Chr(10) & "P1" & Chr(10)
    Print #1, label_String
    Close #1

End Sub

if I change to lpt to usb001 it does not print anything. What am I doing wrong please?

Many thanks
Lee