Did you check both tx and rx lines? I have found (I think it was a
motorola gsm module) where either the tx or the rx was running at 5v
whilst the other was running 3.3 volt.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Amaury Jacquot
Sent: Wednesday, April 14, 2004 10:39 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: connecting a Garmin GPS 16A to a PC serial port


Andre Thomas wrote:
> Amaury,
>
> I am not sure if the same applies but I am toying with a GPS module at

> the moment. This one uses 3volt TTL logic so I needed to use a
> MAX3232/SP3232 to enable 5volt rs232 to 3volt ttl conversion instead
> of a normal max232/sp232.

I checked with an oscilloscope, and I had those 5 divisions on the
1v/div setting :D


> Hope that helps.
>
> Regards,
> Andre Thomas
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Amaury Jacquot
> Sent: Wednesday, April 14, 2004 10:09 AM
> 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.
>
> I'm desperate :/
>
> Anyone already encountered this beast or has advice ?
>
> Sincerely
>
> Amaury

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