How do I turn off the scanner beeper on a DS457

I'm developing a Hands Free - Progress Scanner (bar code scanner always on) application (DS457) that reads a bar code off a label that contains three different bar codes.


I can tell the difference between the three (3) bar codes.   When I receive the correct bar code, I have the scanner beep 5 times to acknowledge the correct bar code has been read.


But, the scanner always initially beeps once when it reads a bar code, before the bar code is passed to my code.


I want to turn this beep off. 


I only want the bar code to beep when I have read the bar code I am looking for.