Hi,
USB protocol is totally different than serial protocol.
You ll get data in 64 bytes of chunk from device.
You have to write the sys,dll and ocx file for your usb device.
If you want you can use the windows default sys file also.
You can modify the same vb s/w by including the ocx file in it.
In s/w side same modifications are required.
But in device side you may have to change the h/w as well as f/w
if your old h/w doesn't support usb.


Warm Regards
rishi