On 31 Aug 2007 at 16:52, PAUL James wrote:

> Why not use optoisolators in each of the programming lines.   That
> way, no mains power could enter the programmer, computer or operator.

It's not quite so straight forward with one of the lines being bidirectional 
unless you are doing the programmer yourself.
I could opto-isolate the comms to the PC. I have to admit, I hadn't thought of 
that. Thanks.
Seems like a lot of bench space to give the user a button to press, though.


Steve.

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