Hi Jeff,

    What's the current through the LED of the optocoupler when the 
signal from the multiprogrammer is active, i.e. what's the resistor 
value and voltage across it?  More importantly, I think you've got the 
emitter and collector swapped on the NPN from the optocoupler.  The 
collectors (even numbered pins) should be pulled up with the emitters 
(odd numbered pins) tied to ground.

hth,

Tony


icabjeff wrote:
> Here is a more detailed image. I'm using a ISOCOM - ISP321-4X - OPTOCOUPLER,
> DIP-16, QUAD, TR 
> http://www.farnell.com/datasheets/90976.pdf
> http://www.farnell.com/datasheets/90976.pdf 
> http://www.nabble.com/file/p25249957/PICtoI-PAC.jpeg 
> Jeff
>
> On Mon, 31 Aug 2009 09:57:33 -0700 (PDT), "icabjeff" <jmgray@mac.com>
> said:
>   
>> I'm connecting the PIC output from a
>> 9pin
>> out port on the e block mulprogrammer though a quad opto-coupler to an
>> I-PAC
>> keyboard encoder. 
>>     
>
> Hi Jeff,
>
> There's some lingo there that I don't get. So I looked at your
> schematic, and it doesn't make complete sense either, but since you
> didn't specify pin numbers or part numbers it's hard to tell. Maybe you
> used AC input optocouplers, but if not, maybe you have the input
> polarity backward on the optocoupler.
>
> Please post another diagram with pin numbers and part numbers.
>
> BTW, this is more [EE] than [PIC] but hopefully it'll get there soon,
> and there's usually no hope trying to change a thread, but if you post
> another schematic please use [EE] in the subject. Thanks.
>
> Cheerful regards,
>
> Bob
>
>   
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