Searching \ for '[EE]: connecting a Garmin GPS 16A to a PC serial p' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/io/sensors.htm?key=gps
Search entire site for: 'connecting a Garmin GPS 16A to a PC serial p'.

Exact match. Not showing close matches.
PICList Thread
'[EE]: connecting a Garmin GPS 16A to a PC serial p'
2004\04\14@041004 by Amaury Jacquot

flavicon
face
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

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email spam_OUTlistservTakeThisOuTspammitvma.mit.edu with SET PICList DIGEST in the body

2004\04\14@043322 by Andre Thomas

flavicon
face
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.

Hope that helps.

Regards,
Andre Thomas

{Original Message removed}

2004\04\14@043946 by Amaury Jacquot

flavicon
face
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 removed}

2004\04\14@044400 by hael Rigby-Jones

picon face
>-----Original Message-----
>From: Amaury Jacquot [.....sxpertKILLspamspam@spam@ESITCOM.ORG]
>Sent: 14 April 2004 09:09
>To: PICLISTspamKILLspamMITVMA.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




=======================================================================
This e-mail is intended for the person it is addressed to only. The
information contained in it may be confidential and/or protected by
law. If you are not the intended recipient of this message, you must
not make any use of this information, or copy or show it to any
person. Please contact us immediately to tell us that you have
received this e-mail, and return the original to us. Any use,
forwarding, printing or copying of this message is strictly prohibited.
No part of this message can be considered a request for goods or
services.
=======================================================================
Any questions about Bookham's E-Mail service should be directed to
.....postmasterKILLspamspam.....bookham.com.

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email EraseMElistservspam_OUTspamTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

2004\04\14@044402 by Andre Thomas

flavicon
face
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 removed}

2004\04\14@051658 by Amaury Jacquot

flavicon
face
Andre Thomas wrote:
> 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.

yeah, the oscilloscope was showing 5v/0v on one cable, and about 50mv to
10mv crosstalk on the other.

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listservspamspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

2004\04\14@051906 by Amaury Jacquot

flavicon
face
Michael Rigby-Jones wrote:
> 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.

that's what I thought...
next step, adding a 74LS06 inverter before the max232...
will come back after trying that ...

Sincerely

Amaury

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email @spam@listservKILLspamspammitvma.mit.edu with SET PICList DIGEST in the body

2004\04\14@052320 by Andre Thomas

flavicon
face
I think you can use setserial /dev/ttyS0 to set the speed and other
options on the com port.. I cant remember exactly - also , try this
before using the max232 because it seems that gps of yours doesn't need
a level converter so if you add a level converter the logic is gonna be
inverted which wont work anyway

{Original Message removed}

2004\04\14@052735 by Amaury Jacquot

flavicon
face
Andre Thomas wrote:
> I think you can use setserial /dev/ttyS0 to set the speed and other
> options on the com port.. I cant remember exactly - also , try this
> before using the max232 because it seems that gps of yours doesn't need
> a level converter so if you add a level converter the logic is gonna be
> inverted which wont work anyway

I used stty, which does the same thing in a much easier manner :D
it seems my serial ports don't like the ttl levels...

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email KILLspamlistservKILLspamspammitvma.mit.edu with SET PICList DIGEST in the body

More... (looser matching)
- Last day of these posts
- In 2004 , 2005 only
- Today
- New search...