Hello

I found this remote coeds in the image attached:


and want to generate Pronto hex code out of it, in nec1 protocol.

I am trying to figure out what is the DSF parameters out of it and put it inside IrScrutinizer to generate the pronto code, but the IrScrutinizer keeps giving me errors.

can you give me an example how to do it then?

thank u

Strincty speaking, you have to guess here. But on the other hand there is only one reasonable guess...

The 8-digit hexadecimal number is ("we guess") formed from D (bitreversed), S (bitreversed), F (bitreversed), and the complement of F, bitreversed, each being two hexadeimal numbers. So for D you take 0x80 = 0b10000000 and reverse it to 0b00000001 = 0x01, etc. You can enter hexadecimal numbers in IrScrutinizer if you precede them by "0x" (without the quotes). For example, "Power" turns into D=0x01, S=0xFE, F=0x58.

You may find the Hex Calculator under the Tools menu useful for computing the bit reversal. there called "LSB".

Extra fact: Since S is the one-complement of D, it can be left out (leave the S file blank).

hi Barf and thank you for your reply but I can't follow you.

so let's take the example with the "POWER": 807F 1AE5
* DSF each should be two digits?
so-
D: 80
S: 7F
F: 1A
and what about the left over "E5"?

* if I follow you I now need to convert DSF lke so:
D= 0x80 -> 0b10000000 -> now why we need to reverseit?
S= 0x7F -> 0b1111111 -> reverse that too? to what?
F= 0x1A -> 0b11010 -> same question
and again, what about the left over of "E5"?

* besides, why we need to reverse the bits?

thank you for your answer, I would really appreciate if you can explain the process in details.

1A --> 0001 1010
E5 --> 1110 0101

The remote will compliment 1A to E5 as it transmits. The unit will check this to make sure that the transmission is correctly received.

So if I follow the example, the code for
"Mute" = 807F 01FE
in DSF it would be:
D= 01 (because "01" is the LSB of "80")
S= FE (because "FE" is the lsb-compliment "80"-> i.e the compliment of 01)
F= 80 (because "80" is the LSB of "01")

am i correct?

yes, but better than


is that it is LSB of 7F


it is a check, so that (some) transmission errors are detected, and corresponding signals rejected.


The protocol was designed that way... somewhat awkward for humans, easy for machines.