Have searched this site and Google in hopes of finding the answer as to why I can not interface my MX-600 or Next gen. RF extender/remote with a new Comcast RNG-110. Have found a lot of info from others with a similar problem. Tried to put codes 113 (would not accept), 120 and 123 into the MX-600. There was no response. Inserted the Next Gen. battery/transmitter (new, latest plus model as recommended by the distributor) into the remote that came with the RNG-110 with no response either with direct view or through RF to the receiver/blaster. It readily controls by IR and RF all my other components. After reviewing manuals from other newer URC remotes, seems they may not function with the new boxes either. Would really appreciate any info or direction.

You are gonna need a PC programmable URC remote to get this code into a remote.

Well, there are roughly 15 million Comcast remotes that can control the RNG110 easily (Cable 1982).

Here's why the XMP protocol is difficult to learn, and probably why the Next Generation transmitter has difficulty.

Most IR signals are transmitted as binary code-- the signal is made up of 2 burst pairs which represent either zero and one. As an example, the NEC IR protocol uses a short burst of light (let's call the length 1 unit) followed by 1 unit of dark to represent 0. A one is represented by 1 unit of light and 3 units of dark.

The XMP protocol has uses 16 burst pairs which represent the 16 hexadecimal digits 0 through F. Zero is represented by 3 (much shorter) units of on, and 10 units of off. Each succeeding digit has 2 units more of off time, so digit F has 40 units of off time. This kind of coding ends up needing about 4 times less data, but it puts real stress on the timing accuracy of the remotes, especially in learning. The XMP receivers in the electronic components can correct for timing drift in a received signal, but the learning circuitry in a remote doesn't know which protocol it is getting. Also, in a learning situation, two remotes are used, and the timing inaccuracy of both contribute to errors.

There's another complication for learning remotes. Remotes typically try to characterize the IR signal as recognizable burst pairs, and they don't expect 16 genuinely different burst pairs. So even with a perfect time base, they may not be able to learn the signals.

I think the Nex Gen uses electrical noise from the remote's microprocessor to determine the temporal pattern of the RF signal it transmits. Probably it also need to classify the signals into recognizable burst pairs, and it may be programmed to reject signals which have 20 times more off time than on time.

Thanks for the reply and lesson in quantum physics (jk, I never thought it was this involved). I should have paid more attention during those lectures in college. So, I guess it's time to borrow from the 401k and invest in an updated pc based remote. Like the range of my MX-600 and have read about the short range of the Logitech models. Anyone have a make/model suggestion that has a good whole house RF range but won't break the bank?

MX850 has the look/feel of your MX600, except it has a serial plug for interface. Better yet would be the MX900 w/lot's more features and USB interface. Both are RF.

The MX850 is a little pricy for just wanting to turn on and set the channel on the RNG110. Are there any other PC programable remotes that are less costly?
Thanks,

URC KP900 is less expensive, and computer programmable. No numeric keypad however, but you can always build favorites or just use the GUIDE and SELECT buttons.

Eh, I wouldn't recommend a KP900 for TV viewing. Great for a zone 2 or audio zone remote, but not so much for channel surfing.



Well if that's "just" what you want to do, then use the Comcast remote. If you need a capable universal remote that can be programmed to control your whole system, then an MX850 is suitable. But if you need a remote to "just turn on and set the channel" then I don't see a problem in using the Comcast remote.

That's like saying a 5000 square foot home is a little pricey for just wanting to store a couple things in the attic. Rent a storage unit then.

You buy what you need to fit your system and your needs.

I actually want to take advantage of the 'clock' function to turn the STB and TV in the morning. So I need a remote with the clock function that can handle the RBG110 codes. Again, least cost option. Seems like Comcast always has an "I got ya". Like forcing us to lease a Docsis3 box b/c they can not be purchased.

No help on the remote with a timer. But we have Comcast, and use our own Motorola SURFboard SB6120 DOCSIS 3 modem.  Less than $100.

Here's Comcast's list of approved modems. Lots of DOCSIS 3 possibilities that you can purchase.