Yes, 2 Key codes are reserved for discrete power ON and OFF.
0x37 = ON
0x38 = OFF
The original CM-7500RC 1st generation remote only has one DVR+ power button to toggle the power on/off.
The CM-7500XRC2 2nd generation remote has separate On/Off button control. (CM7500)
CM-7500TB1 CM-7500GB16 CM7500GB16 CM7500TB1 CM-7500 CM7500