>-----Original Message-----
>From: Amaury Jacquot [mailto:sxpert@ESITCOM.ORG]
>Sent: 14 April 2004 09:09
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [EE]: connecting a Garmin GPS 16A to a PC serial port
>
>
>Hi,
>I just received my GPS16A (200ms updates) and am trying to
>connect it to my PC serial port, with no luck so far...
>
>I first tried to connect it directly, as explained in the
>documentation, but only got garbage. the doc states that the
>thing is outputting TTL levels, so I connected a max232 and
>tried that. no go.

If the documentation suggests that the TTL output will work with a standard
serial port, it's possible you have a particularly fussy serial port on
yopur PC that dosen't like TTL levels.  If this is the case you can't simply
add a MAX232 as they invert the data levels.  You will either have to invert
the data before the MAX232 using e.g. a transistor or a NOT gate, or
build/buy an RS232 line driver that dosen't invert.

Regards

Mike




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