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camera shutter speed

Hi, 
I want to set the shutter-speed of "Sony Pan-Tilt-Zoom camera" ,therefore I
added to ptzsys.c the next lines: 

/* set the shutter speed: command string - 81 01 04 4A 0z 0z 0z 0z ff,
   where zzzz = 0000 is the minimum speed (1/60 sec.) 
   and zzzz = 001B is the maximum speed (1/10000 sec.) */ 
static unsigned char shutterb[9] = { 0x81, 0x01, 0x04, 0x4A, 0x00, 0x00,
                                     0x00, 0x00, 0xff }; 

EXPORT void 
sfPTZCamShutter(void) { 

  sfRobotComStrn( sfCOMPTZCAM, shutterb, 9 ); 
  /*sfCOMPTZCAM : the PSOS command number for PTZ camera-directed
    commands. 
    shutterb(str) : the PTZ camera command string. 
    9(slen): the length of the command string. */ 

  sfMessage( "PTZ camera shutter set . . ." ); 

} 
 

and later ,in the sfLoadInit section: 

sfAddEvalFn( "sfPTZCamShutter", sfPTZCamShutter, sfVoid, 0); 
 

I remaked ptzsys.dll and added to ptzdemo.act the lines: 

sfPTZCamShutter( ); 
wait 20; 

Finally , I tried to run ptzdemo.act with many shutter-speeds. I didn't
notice any particular difference. 
Have I done any mistake ? 

Bye, Raz.