[Discuss] [possibly OT] Advanced LIRC circuit

[Chris Mueller]

I'm not certain if this is the case with Asrock motherboards, but newer 
PC's usually have a riser on the motherboard and 'dongle' that fits in a 
free PCI plate. Because of this modular design, i'd imagine that by 
default the com ports are disabled? I'd first double check within the 
bios to see if the device is enabled. If your kernel does recognize the 
com port correctly, you can always short out the TX/RX pins, and write 
something to the device while simultaneously reading the input buffer. 
That'd be a quick-and-dirty check to see if the COM port isn't to blame. 
Or, just plug in an old serial mouse and cat out the device ... watch 
the pretty characters ;) lastly, i'd check the power as somebody else 
mentioned. It's most likely running a 5 volt circuit (just guessing?), 
check to see if the RTS line (also assuming you're using this for power) 
can provide a near stable voltage. You wouldn't happen to have schematics?

best of luck,
-chris
>>>
>>>  I have been using the home brew lirc receiver circuit with my PI machine
>>>  without any problem. I have upgraded my machine recently with AMD
>>> semapron processor with Asrock mother-board. the mother-board has only
>>> one COM port. The problem is my  receiver circuit is not working with the
>>> new mother-board where it is working  perfectly with the mother-board of
>>> PI. I am using the same HDD hence same 2.6.10  custom build kernel with
>>> both mother-board & CPU. May be the new mother-board fails to  provide
>>> the required voltage/current to the receiver circuit. Could any one know
>>> any lirc receiver circuit which can work with this type of low
>>> voltage/current com port ?
>>>
>>> I know about http://www.irblaster.info/receiver.html which works down
>>> about 5.2V with about 15mA output from your serial port. But the site
>>> does not provide any circuit ; only sell the ready made kit.
>>>
>>>  thanks in advanced.