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Pocket GPS World :: View topic - Help! Toshiba e750/Earthmate with USB<->Ser cable
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Help! Toshiba e750/Earthmate with USB<->Ser cable

 
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tbfisk
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Joined: Jan 06, 2005
Posts: 2

PostPosted: Thu Jan 06, 2005 10:07 pm    Post subject: Help! Toshiba e750/Earthmate with USB<->Ser cable Reply with quote

I have the DeLorme Earthmate running (err...well…sometimes…) with a USB<->Serial cable on a Toshiba e750 with the Prolific PL-2303 driver. The problem that I have is that about 95% of the time, when connecting the USB<->Serial cable to the e750 the error message

USB OVER CURRECT DECTECT

USB device is turned off. Please
Disconnect USB device.


I have tried everything I know of to try to figure out why this is coming up…from soft reboots to a total device reset. Usually I can get everything working after a total device reset…but only for a while. If a soft reboot is done, then most likely I will end up with the error message again.

Have you heard of this? Any ideas?

Thanks!

Tom
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lbendlin
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Joined: 02/11/2002 22:41:59
Posts: 11878
Location: Massachusetts, USA

PostPosted: Fri Jan 07, 2005 12:00 am    Post subject: Reply with quote

I think the message says Over-Current. Get a GPS receiver that consumes less power.
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tbfisk
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Joined: Jan 06, 2005
Posts: 2

PostPosted: Fri Jan 07, 2005 12:34 am    Post subject: Reply with quote

Yes...a typo on my part. Over Current. I am using a powered USB<->Serial cable from Supply.Net (http://www.thesupplynet.com/searchresults.cfm?mySearch=product&prodName=210) that supposedly powers the GPS device rather than the e750.

So you are saying that the GPS is not getting enough power?
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lbendlin
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Joined: 02/11/2002 22:41:59
Posts: 11878
Location: Massachusetts, USA

PostPosted: Fri Jan 07, 2005 12:47 am    Post subject: Reply with quote

yes, the GPS (and the USB>Serial converter) draw more current than the Toshiba can deliver
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Pc-Mobile
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Joined: 26/10/2002 10:38:36
Posts: 789
Location: Hong Kong

PostPosted: Fri Jan 07, 2005 4:16 pm    Post subject: Reply with quote

tbfisk wrote:
Yes...a typo on my part. Over Current. I am using a powered USB<->Serial cable from Supply.Net (http://www.thesupplynet.com/searchresults.cfm?mySearch=product&prodName=210) that supposedly powers the GPS device rather than the e750.

So you are saying that the GPS is not getting enough power?

The cable should power BOTH the PDA and GPS.
The over-current message may pop up occasionally in this set up (USB>serial converter).
Does it come up with or without external power (from cigar lighter)?

If it comes up consistantly with external power connected, you may have a defective cable.
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http://pc-mobile.net/gps.htm
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