USB Control Of Powerpoint

[Homerclese]

Hello,

Part of my PIC project involves the control of Powerpoint presentation slides which can be addressed by keyboard entry (1 enter, 2 enter etc.). I have set up a serial to USB converter cable and by using Serout in a loop I am able to port and verify the nesessary digits to the MCS serial communicator through the USB port.


'Serial to USB control test

Val = 49
loop:

Serout PORTE.1,N2400,[val,13]
val=val+1
if val = 53 then
val = 49

endif
pause 2000
goto loop


However, when Powerpoint is set to show slides by manual control, nothing happens. A Keyboard entry changes slides but it does not respond to the USB inputs sent by the PIC. I have also tested with a numerical USB keypad, which does work. I tried different com ports. How do I get the USB input to look like a keyboard or keypad input to Powerpoint.