IRForum

Posted: **Tue Jun 18, 2019 6:10 am**

I have order MakeIR product. Let me receive it and come back to you again.
Thanks for the support.

Posted: **Thu Oct 28, 2021 8:02 am**

Hi, I am currently analyzing this code to embed in an AC control device, I understand the checksum rule you mentioned, but the last nibble, I don't understand its rule. Can you explain it to me?

Posted: **Thu Oct 28, 2021 12:00 pm**

Hi Tien
I don't know how I could explain better than the detailed annotated image above.

I also replied to your email directly.

There are some video on checksum & reverse engineering in the videos link below. Should also be in the user guide.
If you cannot figure it out we can look at 1 or 2 protocols for you.
If you need to send us some example signals, here is the process.
https://wiki.analysir.com/index.php?tit ... r_AC_units
https://www.youtube.com/AnalysIR/videos

Note: A certain konwledge level with coding bits/bytes/nibbles/hex/binary is a pre-requisite.

Posted: **Tue Nov 02, 2021 1:48 pm**

Thanks for replying to my email. I understand the steps but I has problems with checksum. Can you help me describe the checksum analysis of the file I attached by the same way you did in your comment on the forum post? Daikin Remote - IRForum (analysir.com) ? I'm having trouble identifying the checksum. One more time, thank you very much.

OK it is quite simle using the tools in AnalysIR

2021-11-02 13_39_04-AnalysIR - AC Reverse Engineering Tool.jpg

Checksum Rule:
The XOR of all the nibbles must equal 0x0 or zero, using LSB8.

So you need to change the 2nd last nibble (highlighted in red above) so that the XOR of every nibble is zero.

2021-11-02 13_44_58-IRForum - Post a reply — Mozilla Firefox.jpg

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