Testing a 1488 line driver...

[Gene Buckle]

> On Wednesday 02 January 2008 22:10, Gene Buckle wrote:
>> I used an LED to watch the output on the 1488.
>
> With an appropriate current-limiting resistor I would assume?
>
I actually used a little light bar I have that has 3 12V LED assemblies on 
it.  I ended up using this after my resistor decade box died on me and I 
couldn't find a 500 Ohm resistor. :)

>> The LED lights the instant I attach it to the output and doesn't flicker or
>> go out when I reboot the computer to make it send data out the port.
>
> The little tester I have for rs232 stuff uses bi-color LEDs,  makes it easier
> to see what's going on.
>
I've got one of those as well - it never shows a state change.  I tried 
that first.

> Could be,  I've certainly replaced my share of those.  And put sockets in
> while I was at it.  :-)   Just make sure it's getting the proper power
> supplies,  as if one or both of them are missing you won't see proper output
> then,  either.
>
I did check the power first. :)  12V like it's supposed to be.  If I have 
to pull the board, I'll certainly put in a socket. :)

g.


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