Are you 100% sure you have the correct command codes. I googled RS232 protocol for View Sonic projectors and found some documents. But all sayPOWER ON / POWER OFF
POWER ON BE,EF,10,05,00,C6,FF,11,11,01,00,01,00
POWER OFF BE,EF,02,06,00,6D,D2,34,00,00,00,00