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Discrete power hex codes for Cambridge Audio 752BD?
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Post 1 made on Wednesday April 30, 2014 at 11:46
n8g
Lurking Member
Joined:
Posts:
July 2008
8
For some reason I can't wrap my head around how to make IR hex codes. I have read lots of posts and how-to articles. It just doesn't make sense. Therefore, does anyone have discrete power codes for a Cambridge Azur 752BD bluray player? This is the remote codes from Cambridge's website:


Azur 752BD Blu-ray
Remote Control Codes
NEC Code: 49 B6


[Link: cambridgeaudio.com]

Post 2 made on Wednesday April 30, 2014 at 18:44
SysIntegration
Advanced Member
Joined:
Posts:
December 2013
895
You have a couple different approaches here to turn these into to functional codes. I assume you are using a remote that understands pronto hex.

3FG has given a pretty good run down on this thread:
[Link: remotecentral.com]

However, here are the basics.

Your protocol sheet is great. However, it doesn't tell us quite everything. And as you start to read the history either in these threads or about IRp in general, you'll understand some assumptions have to made. [Link: hifi-remote.com]

We first have to assume this NEC1 protocol. This is logical leap because why start with NEC2. Now you need something to decode that for you. The best choice is IRScrutinizer. [Link: hifi-remote.com]

You could also use the yamaha hex generator floating around the web [Link: hifi-remote.com] because we know that yamaha also used NEC1 protocol for their codes. However, you are still going to need IRScrutinizer to tell you if the code is any good.

So in IRScrutinzer, under Options--Output Text format, make sure CCF Pronto hex is selected. (CCF is the old file extension for original pronto files). Go to the Generate Tab.

Protocol: NEC1
D= 0x49
S=0xB6

We got these numbers from the protocol sheet you linked. We are again making assumptions, but we have to start somewhere.

Now to generate a code, we need something in the object field.

For open/close, O=0x0C

This produces:

0000 006C 0022 0002 015B 00AD 0016 0041 0016 0016 0016 0016 0016 0041 0016 0016 0016 0016 0016 0041 0016 0016 0016 0016 0016 0041 0016 0041 0016 0016 0016 0041 0016 0041 0016 0016 0016 0041 0016 0016 0016 0016 0016 0041 0016 0041 0016 0016 0016 0016 0016 0016 0016 0016 0016 0041 0016 0041 0016 0016 0016 0016 0016 0041 0016 0041 0016 0041 0016 0041 0016 05F7 015B 0057 0016 0E6C

If we copy and paste this code into the Scurtinize tab, we learn that this is an NEC1 Protocol / device = 73 / obj= 12.

Does it work? Most likely. However, dump it into your control software and find out.

On/Standby / Toggle lists three codes. Probably one for each.

O=0x04
O=0x13
O=0x1A

Of course, we don't know which of these does what because the protocol sheet laid it out funny. Generate the codes and test them.

Your second option is to use the yamaha code generator. So for open close, we would put 49B6 OCF3 in the box on the page linked above. This produces:

0000 006D 0022 0002 0155 00AA 0015 0040 0015 0015 0015 0015 0015 0040 0015 0015 0015 0015 0015 0040 0015 0015 0015 0015 0015 0040 0015 0040 0015 0015 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0040 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0040 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 05ED 0155 0055 0015 0E47

Just a cursory glance at the code will indicate that this code looks different than the one generated above. However, we copy and paste into the Scrutinze section of IRScrutinzer and find out that it is still NEC1 protocol / device = 73 / object = 12. The carrier frequency is slightly different which probably explains the variance in hex. Reading the IRProtocol primer will help you understand some of the rounding necessary and why these codes are different.

However, your particular device may be very particular about its carrier frequency. The only way to know is to try the codes. I'd generate all these codes for you, but kinesthetic learning is pretty necessary for a CI.

Personally, I would stick with IRScrutinzer. Learning its caveats will actually help you in the long run. You can read some of my post on Sharp IR codes to understand what I mean.
0101001101111001011100110100100101101110011101000110010101100111011100100110000101110100011010010110111101101110

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