jp1 cable fix double keypress?

[baldu050]

Hi,
Very new to all of this. Just got a ofa-8910 remote today. Just using the normal codes and learning I have it doing what I want it to do (dvd, receiver, projector, tv, pc tuner/pvr card), with one exception.

The hauppauge pvr 250 ir receiver seems to be getting more than one keypress signal from the 8910 remote. I was wondering if this was a problem with the IR learning (ie, holding down the button on the old remote sent more than one signal etc), and if the JP1 cable would help me fix this. I found a KM file for the pvr250 ir receiver.

If anyone has any experience with this type of thing on this hardware or other devices, any info would be much appreciated. thanks,

bald

[jon_armstrong]

Just to make sure I understand, you learned the commands for the PVR250 and they don't work correctly. Your question is that if you use a J1 cable and install the PVR250 device upgrade in JP1 Yahoo group Files|Miscellaneous will that solve the problem?

If that is the case, then it is likely that the device upgrade will work better. The reason is that, according the KM upgrade file, it uses the RC5 protocol and that has a toggle bit. Each time a button is released and pressed again, one bit alternates.

Usually the primary symptom of learned commands with toggle bits is that when you can't get the gear to recognize the second successive key press of the same command.

If you use a device upgrade rather than learning, the OFA remotes have the RC5 protocol in its library and it will then handle the toggle bit correctly.

I think anyone here would always recommend going with a JP1 cable and Rob Crowe has just published a very good description of the process http://www.hifi-remote.com/jp1/help/

[johnsfine]

The hauppauge pvr 250 ir receiver seems to be getting more than one keypress signal from the 8910 remote. I was wondering if this was a problem with the IR learning (ie, holding down the button on the old remote sent more than one signal etc),

Most IR systems involve repeatedly sending the same signal while the key is pressed.

If you press the Hauppauge key for a short time when learning, the 8910 is likely to learn it as a few copies of the signal and always replay it as exactly that many copies.

If you press the Hauppauge key for a longer time when learning, the 8910 is likely to learn it as a repeat pattern. Then the number of copies sent by the 8910 will depend on how long you press the 8910 button, just as the number of copies sent by the Hauppauge remote depends on how long you press its key.

Thus it is almost always best to use a very long press of the original remote key when learning, even in cases like this where it seems like the problem is that you learned too long a press.

As Jon said, we can find data on this Hauppauge device indicating that it uses RC5 protocol. The toggle bit in RC5 protocol ought to make problems such as the one you described less likely, though learned signals of RC5 normally have a different problem as Jon described. If you are really having the symptom that we understand from your description, rather than the symptom we expect, then we don't have a very good guess at what is going wrong, so we don't know for sure what it would take to fix.

and if the JP1 cable would help me fix this. I found a KM file for the pvr250 ir receiver.

The upgrade (KM file) certainly would fix the usual problem you get with RC5 learned signals. If your problem is different, maybe the upfrade will fix that too. Maybe not. With expert help (usually available here) JP1 can be used to diagnose and correct such problems regardless of what they turn out to be, but it's hard to guess how hard that might be given the unexpected symptom description.

[baldu050]

Thanks for the excellent reponses. I'll probably get a jp1 cable, as it seems it would be useful for any remote i end up using, whether it's the 8910 or not. Think I may also attempt relearning them, make sure im using long key presses as you suggested.

Thanks

bald

[Opus4]

I realize that this is a little out of date, but in case anyone was still following this subject... the Hauppauge IR receiver software definitely expects to see the RC5 toggle bits. From my experience playing with it, if it receives the same code twice in a row w/o the toggle bit in between, it seems to think that it missed a button press and adds a fake press to replace the one it 'missed'. To replace the Hauppauge remote, you need to have real/complete RC5 codes in your remote that use the toggle bit.

(I ran into this recently while extending the usefullness of the Hauppauge receiver to recognize more RC5 codes than just the 34 buttons that the silver Hauppauge remote uses.)

I wrote a set of simple instructions for adding RC5 codes to a JP1 remote for SageTV users, but am looking for someone to double check my instructions, if anyone is interested...

- Andy