RemoteIRCodes.md

Remote Control IR Codes

In my journey to build a replacement unit, I wanted to try and use the original remote for changing volume, changing source, etc..

Using a generic (~940nm?) infrared receiver module and an Arduino Uno, I made a small sketch which can read the datacodes and transmission protocol from the remote. This remote uses the standard NEC protocol, and thus sends 4 bytes for each button; a 2-byte Address and then the 2-byte Command. The second byte of both of these is the ones-compliment of the first byte, for redundancy-sake.

Additionally I also used my TC-1 multi-tester's IR feature to read datacodes, but the initial results disagreed with what the Arduino gave. After some squinting I realized each TC1 byte was the reverse of the Arduino byte; this is down to a difference in interpretation of the protocol.

The NEC protocol states data should be ordered LSB (least significant bit) first. I believe the Arduino setup is correctly interpreting using LSB-first, whereas the TC-1 is using MSB (most significant bit)-first. Ultimately it doesn't matter which ordering you use, as long as you're consistent. [Speculation time] I do wonder if the designers of this remote picked data codes with MSB-first in mind, though, due to the 2nd digit of numeric-button codes matching perfectly with the respective number when interpreted as MSB-first.

I have included both the LSB-first and MSB-first datacodes in the table below. The remote only has a single Address code; BA4B (MSB-first) / 5DD2 (LSB-first).

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Notes:

• [A] Remote only sends signal if the last "source" button pressed was CD/DVD or FM/AM, or if the Settings or System button have been pressed and the Exit button has not been pressed.
• [B] No signal emitted

Button	Command (MSB)	Command (LSB)	Note
Power	4CB3	32CD
Mute	01FE	807F
CD/DVD	53AC	CA35
FM/AM	06F9	609F
TV	0EF1	708F
CBL/SAT	15EA	A857
AUX	0FF0	F00F
Input	-	-	[B]
Surround(?)	B04F	0DF2	[A]
Settings	807F	01FE
System	708F	0EF1
DVD Menu	906F	09F6	[A]
Guide	D02F	0BF4	[A]
Exit	30CF	0CF3
Up/Tune	C03F	03FC	[A]
Left	A05F	05FA	[A]
Enter	E01F	07F8	[A]
Right	609F	06F9	[A]
Down/Tune	20DF	04FB	[A]
Channel/Track Chapter Up	19E6	9867	[A]
Channel/Track Chapter Down	18E7	18E7	[A]
Volume +	03FC	C03F
Volume -	02FD	40BF
Stop	1AE5	58A7	[A]
Pause	56A9	6A95	[A]
Play	55AA	AA55	[A]
Seek Left	57A8	EA15	[A]
Seek Right	58A7	1AE5	[A]
Shuffle	5CA3	3AC5	[A]
Repeat	9D62	B946	[A]
1	41BE	827D	[A]
2	42BD	42BD	[A]
3	43BC	C23D	[A]
4	44BB	22DD	[A]
5	45BA	A25D	[A]
6	46B9	629D	[A]
7	47B8	E21D	[A]
8	48B7	12ED	[A]
9	49B6	926D	[A]
Info	649B	26D9	[A]
0	40BF	02FD	[A]
Previous	-	-	[B]
Page Down	6897	16E9	[A]
Page Up	6996	9669	[A]
Record	659A	A659	[A]
A	639C	C639	[A]
B	9F60	F906	[A]
C	6798	E619	[A]