controlTransfer vs bulkTransfer for sending data

This app was very helpful, thank you!

I don't know that these changes actually make the app better, they just make it so I can use the app with the MS-2D scanner: 
http://files.microscan.com/downloadcenter/ms2dmanual.pdf
http://www.microscan.com/en-us/products/2d-barcode-readers-and-verifiers/ms-2d-engine.aspx