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Have half the code - need the rest (Cambridge Audio 540C)
This thread has 10 replies. Displaying all posts.
Post 1 made on Friday March 14, 2008 at 10:35
Peter Fullerton
Long Time Member
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Hi. I have just bought a Cambridge Audio 540c v2 CD player. CA's website lists the discrete on and off as:

System Code = A0 A0 (NEC Code)
Key Command Code hex Command Code dec
Power On 46 70
Power Off 45 69

I've always been baffled by converting codes for Pronto use. I'd be grateful if someone would help me with the preliminary Hex sequence for the power discretes.
Post 2 made on Friday March 14, 2008 at 10:42
Kupakai
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You can use makehex to create Pronto hex codes from that information. There is a readme that comes with the program that explains how to do it. Here are the codes:

Power Off
0000 006D 0022 0002 0157 00AC 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0041 0015 0016 0015 0041 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0041 0015 0016 0015 0041 0015 0041 0015 0016 0015 0041 0015 0016 0015 0016 0015 0016 0015 0041 0015 0016 0015 0016 0015 0041 0015 0016 0015 0041 0015 0041 0015 0041 0015 0016 0015 0041 0015 0689 0157 0056 0015 0E94
Power On
0000 006D 0022 0002 0157 00AC 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0041 0015 0016 0015 0041 0015 0016 0015 0016 0015 0016 0015 0016 0015 0016 0015 0041 0015 0016 0015 0041 0015 0016 0015 0041 0015 0041 0015 0016 0015 0016 0015 0016 0015 0041 0015 0016 0015 0041 0015 0016 0015 0016 0015 0041 0015 0041 0015 0041 0015 0016 0015 0041 0015 0689 0157 0056 0015 0E94
OP | Post 3 made on Friday March 14, 2008 at 10:57
Peter Fullerton
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80
Thank you.
Post 4 made on Friday March 14, 2008 at 11:09
johnsfine
IR Expert
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September 2002
5,159
In case those don't work, do you (Peter) have any pronto hex for learned signals of the same device?

Kupakai might be correct in his interpretation of what Cambridge Audio means by "NEC" and "A0 A0" but I don't have a lot of confidence we know what they mean. If we decode any learned signal for the same device, we can find out what they mean.
OP | Post 5 made on Friday March 14, 2008 at 21:09
Peter Fullerton
Long Time Member
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November 2003
80
Kupakai:
thanks for this info. I don't want to sound like a sook but some people immediately get it with MakeHex and some people (like me) don't. I've read the instructions many times but I never seem to be able to get it to work. I'm neither a stupid nor an uneducated man, but when it comes to MakeHex I'm incompetent. BTW, I find making a souffle for the dinner table one of the simplest of tasks, always have from day one; some people won't and never have..

Your codes work. I have tried to replicate them but can't. The only one which comes remotely close for me is using nec1 and that has about 4 groups of numbers out of place.

I'd be grateful if you would tell me

- which irp file you used
- what you typed into the device field EXACTlY, including any spaces, dots etc
- what you typed into the function field EXACTLY etc.

This will then help me to make the codes myself.
OP | Post 6 made on Friday March 14, 2008 at 21:11
Peter Fullerton
Long Time Member
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November 2003
80
John:

Thanks for your reply.

Here is the learned code for play:

0000 0074 0029 000A 0015 0000 0015 0000 0015 0000 0015 0000 0015 0000 0015 0000 0015 0000 0015 009C 0015 0014 0015 0014 0015 0014 0015 0014 0015 0014 0015 003B 0015 0014 0015 003B 0015 0014 0015 0014 0015 0014 0015 0014 0015 0014 0015 003B 0015 0014 0015 003B 0015 003B 0015 0014 0015 003B 0015 0014 0015 003B 0015 0014 0015 0014 0015 0014 0015 0014 0015 003B 0015 0014 0015 003B 0015 0014 0015 003B 0015 003B 0015 003B 0015 077F 0015 0000 0015 0000 0015 0000 0015 0000 0015 0000 0015 0000 0015 0000 0015 009C 0015 003B 0015 0E3E

and the learned code for 8:

0000 0074 0000 000A 0015 0000 0015 0000 0015 0000 0015 0000 0015 0000 0015 0000 0015 0000 0015 009C 0015 003A 0015 0DCF
Post 7 made on Friday March 14, 2008 at 23:07
johnsfine
IR Expert
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September 2002
5,159
I hope those learns are from the wrong device. Because if they are the right device I expect a lot of trouble figuring out what the discrete info from Cambridge Audio meant.

Kupakai used nec1.irp and he set device=160.160
I expect he left function in the irp file unmodified (0..255) and then selected functions 69 and 70 from the output of MakeHex.
OP | Post 8 made on Saturday March 15, 2008 at 00:36
Peter Fullerton
Long Time Member
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80
Thanks for this, John.

(1) I think mine are bad learns because none of them works for the Cambridge CD player. I have tried several learning variations: original remote further away from the Pronto, press until beep, short press only, etc - to no avail.

(2) How did you get from A0 A0 to 160.160? If it was backward learning from Kupakai's code above, how did he arrive at this I wonder.

(3) I have used nec1.irp and device 160.160 and have used the last two numerals of the Cambridge code to select from the MakeHex file. Only the ON and OFF work, nothing else works.

(4) The original list from Cambridge Audio is:

System Code = A0 A0 (NEC Code)
Key Command Code hex Command Code dec
1 01 1
2 09 9
3 11 17
4 19 25
5 02 2
6 0A 10
7 12 18
8 1A 26
9 03 3
0 0B 11
1+ 13 19
Prog 1B 27
Play 15 21
Pause 1D 29
Stop 1C 28
Random 0E 14
Remain 0F 15
Skip left 04 4
Skip right 0C 12
Repeat 16 22
AB 17 23
<< 05 5
>> 0D 13
Intro 06 6
Space 1E 30
Open 07 7
Power toggle 44 68
Power On 46 70
Power Off 45 69
Bright toggle 47 71
OP | Post 9 made on Saturday March 15, 2008 at 00:59
Peter Fullerton
Long Time Member
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Eureka. Just thought I'd try NECx1.irp rather than nec1.irp and it works.
Thank you for getting me there guys.
Post 10 made on Saturday March 15, 2008 at 10:18
johnsfine
IR Expert
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September 2002
5,159
Good guess. I probably should have mentioned that. Normally NEC1 is far more common than NECx1 or NECx2, but when the two halves of the System Code are the same, the NECx protocols are more common. I was hoping to determine which NEC protocol it was by examining a learned signal. But the learned signal you posted isn't any NEC protocol.

BTW, A0 hex is 160 decimal, which is where we got 160.160 (For two part device numbers, MakeHex requires you to seperate them with a dot).

When NECx1 is correct then NEC1 or NEC2 might work but unreliably, which might be the behavior you found.

NECx2 is even closer to NECx1. For very short presses of a button NECx2 and NECx1 may send the identical signal. So even though NECx1 seems to work, NECx2 might be correct. The difference would show up in a long press of certain buttons.

I'm not clear on what all the buttons do. The CD doesn't have its own vol commands? The vol is controlled only by a seperate preamp? (normally a long press of Vol+ or VOL- is the best place to test whether NECx1 or NECx2 is better). What about << and >>? Do they have interesting long press behavior with the original remote? If so you could test those with NECx1 vs. NECx2 to see which duplicates the long press behavior of the original remote.

If no button has interesting long press behavior then NECx1 will work perfectly whether it is correct or NECx2 is correct (so there would be no need to find out which is correct).

Last edited by johnsfine on March 15, 2008 10:28.
OP | Post 11 made on Sunday March 16, 2008 at 09:42
Peter Fullerton
Long Time Member
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November 2003
80
With NECx1.irp the << and >> buttons move the CD transport back and forward during playback for as long as the button is held down. Am using a Pronto 9400.


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