I have an NAD Preamp and am trying to find discrete on/off codes.

I also have a Homvision system that can read what my factory NAD remote transmits. It shows that my remote remote is transmitting a Device Code and a Key Code. The Device Code is always 225, and the Key Code varies with the function selected.

Does this mean my One For All code would be 225? As you can probably tell, I have some facts, but am still lost. Am I on the right track? Can I determine the discrete on/off codes based on the information above?

Any help is greatly appreciated.

The OFA setup code numbers don't directly correspond to the device number in the real signal. There is no way to compute the OFA setup code number directly from the IR signal.

We describe a set of signals as having a certain protocol name and a device code. The device code alone (225) doesn't tell much because several different protocols (NEC, etc.) might have device code 225. If you know the protocol name AND the device code, some of the OFA experts here can look up which OFA setup code, if any, does that protocol and device number.

None of that tells you what the discrete codes will be or whether they'll exist.

I may have a shortcut. What is the model number of the NAD preamp?

-Jon

It is an NAD 917. Thanks again for trying to help me last week.

Trey

Trey,

I found my mistake from last week and corrected that thread. The correct commands are

NEC1:135.124:37 EFC=216 for On and
NEC1:135.124:200 EFC=45 for Off

For an OFA remote these are for Audio_0320 and I believe that it is only in the built inlibrary found on a few OFA remotes including the RS 15-2104 and the URC-8811 family and some European OFA remotes. You could also easily upgrade any JP1 remote.

If you have a Pronto, then I have posted the corrected hex in the original thread. If you have an OFA remote, let me know which one and I can explain further.


-Jon

I noticed the various samples for similar devices that are NEC1:135.124 as Jon said, but I didn't mention that because of the "225" quoted above.

225 is 135 with the bits backwards (convert to binary, reverse the bit sequence and convert back to decimal) but that leaves out the subdevice. What exactly did the "Homvision" thing report? (I expect it also reported the key codes with their bits backwards, but if it didn't know the general rules for NEC1, I wonder how it would view the subdevice or the check byte).

John,

I should have mentioned there is a ccf file for the exact model (NAD 917) and it uses NEC1:135.124. It has some commands using the Pronto data base format, that make no sense but most are in the learned format.

-Jon

HomeVision is a home automation controller with 2 way IR capabilities. I am using an IR test screen that displays the Device and Key codes it receives.

In addition, it has a learning screen that provides data for Carrier Frequency, Number of Pulses, Signal Duration, and Carrier Duty Cycle. As you can imagine, all of this means little to me, as I am very new to "advanced" IR control.

Trey

Do you still think a OFA type remote will work? If so, which one do you recommend? Since I already have a nice remote, wouldn't it make since to go with the cheapest ofa type remote that will do the job?
Thank you,
Trey

An OFA remote wouldn't help.
If your device had understood the discretes that Jon expected it to, then you'd be done already.
If your device doesn't understand those discretes transmitted by a Pronto, it won't understand the exact same discretes transmitted by an OFA.
There's nothing you can do with the OFA to help guess some other value for the discretes that you can't do just as easily with the Pronto.

I'm lost. Did Jon's codes come from an OFA remote?

What do people do in my situation - give up?

HWH,

You could try all 256 commands using MakeHex, but my guess is that it won't work. The discrete power commands were what I decoded from the official site some time ago but for a generic NAD device. There were none specifically listed for your device.

At one time they published pronto hex for their various devices, why not contact NAD and ask if they respond to discrete power codes and if so what.

Sometimes, receivers will turn on from off when some or all discrete inputs are selected. You might try that first.

-Jon

I did as you suggested. See below:


Hello,

I have owned my NAD 917 for ~6 years. I have recently learned about transmitting discrete codes from my pronto remote to automate the operation of my home theater.

Can you provide information on the discrete code set used by the 917? Specifically, I am looking for information about the discrete on and off commands, and would appreciate any information you could provide.

.....................................................
NAD Webmaster wrote:

Thank you for your recent request via the NAD Electronics web-site.

The NAD 917 does not have discrete codes, sorry.

Best regards