Gang:
I need discrete power on/power off codes for:
Yamaha RX-V470 receiver
JVC HR-S2901U VCR
Jerrold/General Instruments CFT2024 "Impulse" cable box.

I've tried all the available codes from the RemoteCentral discrete codes list without any good result. Any and all help appreciated.

TIA,
Tb.

Try these for the Yamaha:

Device Code: 126 Function: 126 - On

0000 006D 0022 0002 0157 00AC 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0689 0157 0056 0015 0E94

Device Code: 126 Function: 127-Off

0000 006D 0022 0002 0157 00AC 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0689 0157 0056 0015 0E94

I can't find any ccf file for your model of the JVC so post the pronto hex for the power toggle command and I'll decode it.

I believe that here are two different VCR settings for most JVC VCR's, are you sure you didn't set the VCR to the alternate setting?

I have never seen a GI and or Jerrold set top box with discrete power commands. Most STB's consume about the same amount of power on or off and that is probably well less than $5.00 per year (on or off), so just leave it on.

-Jon

Jon:

Thanks, but the Yamaha codes didn't work. Your point about the STB is very well-taken and of course that's what I'll do. Don't think I've turned it off in five years anyway (grin).

I should perhaps explain that I'm working with the OmniRemotePro software on a Handspring PDA. (works quite well, BTW, and is capable of absorbing Pronto hex codes).

Here's the power-toggle code from the JVC:

0000 0069 0089 0000 0154 00A5 0019 0037 0019 003C 0019 000F 0019 0014 0019 000F 0019 0014 0014 003C 0019 0014 0019 0037 0019 003C 0019 000F 0019 003C 0019 000F 0019 0014 0019 000F 0019 0014 0019 039D 0014 003C 0019 003C 0019 000F 0019 0014 0019 000F 0019 0014 0019 0037 0019 0014 0014 003C 0019 003C 0019 000F 0019 003C 0019 000F 0019 0014 0019 000F 0019 0014 0019 0398 0019 003C 0019 0037 0019 0014 0019 000F 0019 0014 0019 000F 0019 003C 0019 000F 0019 003C 0019 0037 0019 0014 0019 003C 0019 000F 0019 0014 0014 0014 0019 000F 0019 039D 0019 003C 0019 0037 0019 0014 0019 000F 0019 0014 0019 000F 0019 003C 0019 000F 0019 003C 0019 0037 0019 0014 0019 0037 0019 0014 0019 000F 0019 0014 0019 000F 0019 039D 0019 003C 0014 003C 0019 0014 0014 0014 0019 000F 0019 0014 0019 0037 0019 0014 0019 003C 0019 0037 0019 0014 0019 0037 0019 0014 0019 000F 0019 000F 0019 0014 0019 039D 0019 0037 0019 003C 0019 000F 0019 0014 0019 000F 0019 0014 0019 0037 0019 0014 0019 0037 0019 003C 0019 000F 0019 003C 0019 000F 0019 0014 0019 000F 0019 0014 0019 039D 0014 003C 0019 003C 0019 000F 0019 0014 0019 000F 0019 0014 0014 003C 0019 0014 0014 003C 0019 003C 0019 000F 0019 003C 0019 000F 0019 0014 0019 000F 0019 0014 0019 0398 0019 003C 0019 0037 0019 0014 0019 000F 0019 0014 0019 000F 0019 003C 0019 000F 0019 003C 0019 0037 0019 0014 0019 003C 0019 000F 0019 0014 0014 0014 0019 000F 0019 0000


Thanks again!
Tb.

Tb.

Thomas,

Your VCR is VCR1 and the codes posted at RC should work. The alternate On and Off codes in my view are the better choice. The "regular" On or Off codes have a power toggle command followed by the respective power On or Off. But maybe some VCRs need that to respond but I doubt it.

As far as the Yamaha why don't you post your Power Toggle Command. That way I can make sure that we have the right device code and protocol.

-Jon

Jon:

Here's the Yamaha code. Haven't tried the JVC yet but will shortly.

t.

0000 006E 0026 0000 0159 00A0 0019 0014 0019 003C 0014 0014 0019 003C 0019 0037 0019 003C 0019 003C 0019 000F 0019 003C 0019 000F 0019 003C 0019 000F 0019 0014 0019 000F 0019 0014 0019 0037 0019 003C 0019 003C 0019 003C 0019 0037 0019 003C 0019 0014 0014 0014 0019 000F 0019 0014 0019 000F 0019 000F 0019 0014 0019 000F 0019 003C 0019 003C 0019 0037 0019 05CD 0154 0050 0019 0DF7 0154 0050 0019 0000

Device Code: 122 Function: 29-On

0000 006D 0022 0002 0157 00AC 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0040 0015 0015 0015 0040 0015 0040 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 0689 0157 0056 0015 0E94

Device Code: 122 Function: 30 Off

0000 006D 0022 0002 0157 00AC 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 0689 0157 0056 0015 0E94


-Jon

Jon:

No luck with either Yamaha or JVC. How are you working your magic (that is, where are you getting or how are you making these)? Perhaps I can try some of this for myself, rather than driving you nuts with repeated attempts.

The power-on toggle codes and indeed everything else works fine when trained from the original remotes. Do the codes provided in this format incorporate carrier frequency information? Or does that need to be set separately?

You can probably tell you're dealing with technical ignorance here (grin). How can I become less so?

Best, and thanks for all your help,
Tb.

I'm sorry none of these has worked out. I don't have any suggestions other than re-checking your work. I would have thought that at least the VCR or receiver would have responded to discrete codes.

Pronto hex seems myterious but it is really very simple. The Pronto hex codes do include the frequency already. Barry Gordon wrote a good article on how to decode Pronto hex:

[Link: remotecentral.com]

Yamaha has posted some of their IR codes on the web and about mid way down in this thread I give a fairly detailed explanation how to create Pronto hex from those:

[Link: remotecentral.com]

Anything not covered there will be on the final ;)

-Jon

Jon:
OK, you've aided and abetted me in reaching the point where I have enough knowledge to reach stupid and unprovable theories unassisted ;-). Here's one.

I know from experience that the Handspring with the OmniRemote module is pretty twitchy about carrier frequency when it is learning -- I've had dramatically bad results from minor differences there. Now, when I look at the posted codes for the JVC I note that the carrier frequency word in the preamble is slightly different for (eg.) eject vs. power off (6C vs. 6D).
Since nothing in the extensive literature you pointed me at indicates that there's any meaning to the carrier frequency used, I gotta assume that these sometimes get recorded or transcribed with minor differences (as with the JVC example just given) -- and perhaps those differences are sufficient to render otherwise useful codes ineoperative when the twitchy Omniremote is used. So, some questions:

1) Is the carrier freq always supposed to be the same for a given piece of gear?

2) If so, how do we find out which one is correct?

I am thinking that perhaps some of the posted stuff is off in minor ways that the Pronto doesn't notice but the Omniremote does. Or are these just insignificant differences, or differences with a meaning other than what I imagine?

Tnx as always.

I suspect the Handspring/Omni Remote frequency issues may be masking some other issue. Probably it has more to do with how it learns and it's method of determining the frequency. 006C and 006D are ~300Hz apart, and that is very, very close.

The way IR signals are detected by the IR receivers has very little to do with frequency, they are really looking for the shape of the envelope or the modulation, that is Off and On. So, I would doubt that frequency alone would (unless way off) be the problem. it usually affects the range of the signal more than being correctly detected.

Also, as you now know after the first four 2-byte hex words, the rest of Pronto hex is alternating on and off periods expressed in wavelengths. Those also will vary and a lot of people worry that 003F is very different from 0040 but in reality (at 38KHz) they are 26 microseconds (26 millionths of a second different). In fact the Pronto can't discriminate between timing resolutions less than a wavelength.

So in the IR world +/- 10% is normal and the IR receiver designs are very tolerant of variation. (Weak batteries, pointed in the wrong direction, canine modification, etc.)

-Jon