[ntp:questions] OT: GPS18x LVC failure

David J Taylor david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Sun Oct 11 17:29:30 UTC 2009


"Uwe Klein" <> wrote in message news:1df9q6-or4.ln1 at klein-habertwedt.de...
> David J Taylor wrote:
>> Inconsistent with the technical specification, which says 0..+5V, but 
>> consistent with what I measured.
>
> Hmm,
> RS232 line idle is TX active/high.
> TX being inverted that tranlates to nominally -12V
> ( i.e  -3 ... -25 at the receiver )
>
> uwe

Agreed, Uwe.  -5V is what I saw.  It will be interesting to see what 
Garmin say, if anything.  I'll check the replacement unit on the 'scope as 
well.

Cheers,
David 




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