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HkyFrk



Joined: 27 Dec 2003
Posts: 32

PostPosted: Tue Jan 06, 2004 9:29 am    Post subject: Reply with quote

I have a simple interface that used to work. Now I get " no response from interface". When I take off the cable the led blinks twice. What does this mean????? Help!!!

Thanks
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johnsfine
Site Admin


Joined: 10 Aug 2003
Posts: 4766
Location: Bedford, MA

PostPosted: Tue Jan 06, 2004 9:59 am    Post subject: Reply with quote

It is quite common for the led to blink twice when you disconnect the cable.

It normally shows that the reset signal within the JP1 interface is connected properly and that the voltage in the PC parallel port is too low for RESET to work perfectly with your remote. The JP1 interface should work even with the voltage too low for proper operation of the reset signal.

I don't think you get this symptom from plugging the JP1 connector backwards, but I'm not certain, so make sure it is plugged in correctly.

The parallel port voltage might be too low for operation of the other signals in the JP1 interface (though those aren't as picky about voltage as RESET is). In that case it probably would work if you used it without batteries in the remote.

Which resistor values are in your JP1 cable (the old reccomended 10K or the new reccomended 1K)? The lower resistors will make the basic operation of the interface a little less picky about Printer port voltage.
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HkyFrk



Joined: 27 Dec 2003
Posts: 32

PostPosted: Tue Jan 06, 2004 10:01 am    Post subject: Reply with quote

I am using th 1k resistors and the 1n5818 diode. What I can't understand is that it used to work and now it won't budge. I checked all the connections and they are good.
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usblipitor



Joined: 10 Oct 2003
Posts: 516
Location: Greenbelt, MD

PostPosted: Tue Jan 06, 2004 11:25 am    Post subject: Reply with quote

If you have a parallel port printer somewhere in the basement, dust it off and hook it up to the parallel port and see if the parallel port still works. Maybe something on the parallel port burned out?
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