[Steve_Alaniz]

Hi I have one here... I don't think you'll see anything on the Voltmeter... the echo is VERY short and most Meters are not fast enough. If you have access to an Oscilloscope, you might see the missing pulse.
How are you using the Printf? Once again... since the output is a pulse, your best chance of detecting it, without actually timing it, is to change a variable to "1" on the positive edge and use and
if variable == 1 then ... printf some message like "Found"