JP1 Remotes

Now that makes a great deal more sense.

Thanks for researching it.

Symbol wrote:BTW. Large thanks to whoever figured out the 8820 schematic. They have saved me a long and arduous task.

That long and arduous task was mine.

Symbol wrote:Also, if anyone knows it: What does the circuit around pin 4 on the processor (PTB3) do?

John already answered this question (it's for the internal "modem" in some models). However, I can assure you that the URC-8820 remote is wired up as shown in the schematic.

Then I will thank you directly with pleasure!

Thank you mr_d_p_gumby!

johnsfine wrote:
1) Put the IRP understanding engine inside the universal remote (obviously much harder programming task than keeping that engine in a PC program). Then store all the protocols you want in the remote in IRP notation. That is much more concise than the relatively concise way UEI stores protocols. So if you wanted hundreds of protocols in a universal remote the overhead of the engine would be more than paid for by the savings in individual protocols. So you could fit much more in the same flash memory.

I have wanted to do this myself. I've spent more than a few minutes pondering your notation, and trying to think of an implementation.

I'd be interested in helping with this effort, and I think I have the necessary experience to make a useful contribution. But I also have a "day job", so I would only be able to work on this occasionally.

I'll sure need to ask a lot of questions about the IRP notation itself.

And also, we'll need to come up with some method of testing. And some regression tests. Perhaps some variation of the IPCapture program could help us.

I'm not (yet) familiar with the JP1 cable for the 8820, but perhaps the regression tests could be automated-- the PC program would send a request over the JP1 cable asking that a certain function be performed, and then the (modified) IRCapture program would check and see if the correct IR sequence was sent. Errors would be logged, and the procedure could run unattended for hours.

William

I'm glad to help with any answers about the IRP notation.

I just purchase a URC-8820 they were on sale for a while at MCM electronics. If I build the JP1.2 interface on this Web Site is it backwards compatable with the JP1.1 protocol or will I always need 2 different interfaces? I can't seem to get a clear answer on this?

If you build a JP1.x cable which is in this document, it will be compatible with both JP1.2 and JP1.1 remotes. JP1.2 cable is just JP1.x with three components removed.

Be aware that the JP1.1 interface is NOT the same thing as the JP1 interface. JP1.1 is an uncommon interface for this group.

The cables that support JP1.1 and JP1.2 do NOT support JP1. You still need a different cable for JP1.

BTW so far as I understand, JP1.3 is not a different interface standard. It is a JP1.2 interface with a different CPU than the JP1.2 remotes.

johnsfine wrote: BTW so far as I understand, JP1.3 is not a different interface standard. It is a JP1.2 interface with a different CPU than the JP1.2 remotes.

I believe so, since my JP1.2 interface reads my JP1.3 Atlas remote just fine.

If you've bought an 8820 then you need a JP1.2 interface. For most of the older remotes you need a JP1 interface. They have the same 6-hole connector but are otherwise completely different.

JP1.1 seems to be an evolutionary dead-end. JP1.3, as stated above can still use a JP1.2 cable. Forget about the JP1.x interface.

The 8820 is good. You can put macros on the device keys (so a long press can be set up to change TV inputs, for instance), it's got a fair bit of learning memory and an extender is under development.

Since the 8820 is internally the same as the 10820 you can easily control an additional two devices by, say, putting SAT on [Shift]-CBL and AUX2 on [Shift]-AUX1.

Successfull communication with the URC-8820, JP1.X interface and Windows x64. JP1 Parallel cable still will not function with Windows x64. The new interface seems to be imune to the driver problems with Windows x64. I Made a copy of factory reset 981 with IR 701 and URC-8820 successfully. Ready for furthur input by this web site, remote is running Zenith TV, Sony DVD, and NEO MP3 player.