Hello,

I have a few questions regarding NEC1 hex to Pronto conversion. Being new to this and after reading various posts it seems to me that there can be 4 possible solutions due to notation (i.e. MSB->LSB bit-reversing) and the use of command byte vs. complement byte.

Example: NEC1 hex (Volume UP): 0x10EF 0x1AE5

We have device address, subdevice, command, complement, giving the following solutions:

0x10EF 0x1AE5 (using MSB, 3rd byte)
D = 0x10
S = 0xEF
F = 0x1A

0x10EF 0x1AE5 (using MSB, 4th byte/complement)
D = 0x10
S = 0xEF
F = 0xE5

0xF708 0xA758 (using LSB, 3rd byte)
D = 0x08
S = 0xF7
F = 0x58

0xF708 0xA758 (using LSB, 4th byte/complement)
D = 0x08
S = 0xF7
F = 0xA7

Is this a correct assessment?

Is there a "correct" use as per NEC specification?

Is there a "popular" use among manufactorers?

What is the difference between NEC and NEC1 as seen in IrScrutinizer?