There is the 'channel id' code, then the 'cmd code' and for the power setting there are 3 bytes that follow the 'cmd code' byte 1 is the 'A' channel, byte 2 is the 'B' channel and byte 3 is the 'C' channel. If a channel is not used then the value of byte for that channel is '00'. Each byte for the power level is 8 bits long with each bit having a value of '0' or '1'.
No power 0/0 = 00x or 00000000 Full 1/1 = 01x or 0000001 One half 1/2 = 0Cx or 00001101 one quarter 1/4 = 1Bx or 00011001 One eighth 1/8 = 25x or 001000101 One xixteenth 1/16 = 31x or 00110001 One thirty seccond 1/32 = 3Cx or 00111101 One sixty forth 1/64 = 49x or 01001001 One one hundred twenty eight 1/128 = 55x or 01010101
The bits are timed intervals after the command code.