[time-nuts] GPDSO is working

Bob Stewart bob at evoria.net
Fri Jul 12 21:12:20 EDT 2013


Hi Brian,

I don't understand.  Are you saying that I need to add still more parts to get an RS-232 to TTL adapter to work?  Here's the circuit for what I'm currently using, and it looks like it's inverter based.  I'm not using it, because it's the only one I have and I want to keep it available for other use.

http://www.scienceprog.com/wp-content/uploads/2006i/RS232_ALT/interface_schematic.gif

Bob - AE6RV





>________________________________
> From: Brian Alsop <alsopb at nc.rr.com>
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Friday, July 12, 2013 7:36 PM
>Subject: Re: [time-nuts] GPDSO is working
> 
>
>Max 232's invert the polarity.  You have to follow with an inverting 
>gate if the TTL stuff worked.
>
>Brian
>
>


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