Hi peepz,

I Wanted to understand more about the IR code format etc and read the articale by Barry Gordon. This has helped greately but surley there is a whooping mistake (or have i missed something), in his explanation of the Pioneer IR code.

[Link: remotecentral.com]

The way i read the paragraph explaning the example Pioneer IR code is the 32 bits of data are broken down into 4 lots of 8. The first 8 bits for the device code and the second lot of 8 bits for the device code compliment. This later format is repeated for the function code.

If the two 8 bit words representing either the device code or function code then have a logical "or" applied, if no errors, will result in all 1's or decimal 255.

The problem i have is in the example the two 8 bit words for the device code and function are reversed?

If you look at the hex code, after the lead in, you get 1 1 1 0 1 0 1 0 which according to his explination is the complement device code NOT the device code. Or as i suggested before have I missed something.

Many thanks for looking

Berrick

As I'm trying to troubleshoot my problems with my DV-696, I thought I'd work through this. Here is a breakdown for the Play command for this player:

Play

0000 0067 Learned, 40kHz
0000 0022 No burst 1, 34 dwords of burst 2
0152 00AD Lead in
01 0015 0041 1
02 0015 0041 1
03 0015 0016 0
04 0015 0016 0
05 0015 0016 0
06 0015 0041 1
07 0015 0016 0
08 0015 0041 1
09 0015 0016 0
10 0015 0016 0
11 0015 0041 1
12 0015 0041 1
13 0015 0041 1
14 0015 0016 0
15 0015 0041 1
16 0015 0016 0
17 0015 0016 0
18 0015 0041 1
19 0015 0041 1
20 0015 0041 1
21 0015 0041 1
22 0015 0016 0
23 0015 0016 0
24 0015 0041 1
25 0015 0041 1
26 0015 0016 0
27 0015 0016 0
28 0015 0016 0
29 0015 0016 0
30 0015 0041 1
31 0015 0041 1
32 0015 0016 0
0015 040B Lead out

11000101 reverses to 10100011 (device code = 163)
00111010 check
01111001 reserves to 10011110 (function code = 158)
10000110 check

If you do the same for stop, you find the device code is the same (luckily!) and the function code is 152.

Hope this helps.

You're absolutely right, Barry made a mistake with this one. Basically, he got his ONEs and ZEROs swapped, so the device and function codes that he quotes later on are all complimented (ie, to correct them, subtract his numbers from 255).

Good catch.

If you're into learning about IR signals, there are a couple more articles here (including a copy of Barry's article)

[Link: hifi-remote.com]

Thanks The Robman,

Was begining to think i had mis understood. I have had a quick skim of those links and will be going back for a better look asap