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GPSmap 176 not communicating with laptop via serial/USB adaptor

Hello Team,
GPS communicates via supplied 4 pin/ serial cable in old model laptop. New laptop only has USB ports. Bought a serial-to-USB adaptor cable however am unable to get communication. When I plug the USB in I get the sound signal that a device is connected.
If I try to upload/ download waypoints an error tells me there is no communication.
Hoping you can help.

Peter

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  • Peter Rob Feb 09, 2009

    Thanks for the help Niraj,

    However I posted back in November 2008 and turned elsewhere and received a solution to my problem after not receiving any response from here.

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Sounds you do not have appropriate usb driver so find download and install usb driver from following website:
http://www.usb-drivers.com/
chose your compute product to make sure about USB driver.

Posted on Feb 09, 2009

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Hi fire1961,

Downloading data from my FURUNO GP-30 gave me no problems. But it took me long time to figure out why I coudn't upload waypoints and routes to the GP-30 via the serial port in my ThinkPad T30.

I tried nearly everything tested the cable, tested a lot of different software and even wrote a little c-program to communicate with the serial port. I also tried a serial-to-usb converter with no results. Then I stumbled over this RS232 Tutorial. According to this - serial ports are not just serial port but can be divided into three general categories:

The types of driver ICs used in serial ports can be divided into three general categories:

* Drivers which require plus (+) and minus (-) voltage power supplies such as the 1488 series of interface integrated circuits. (Most desktop and tower PCs use this type of driver.)
* Low power drivers which require one +5 volt power supply. This type of driver has an internal charge pump for voltage conversion. (Many industrial microprocessor controls use this type of driver.)
* Low voltage (3.3 v) and low power drivers which meet the EIA-562 Standard. (Used on notebooks and laptops.)

Then I installed the waypoint upload software to my ten years old Compaq Presario and suddenly I could upload routes and waypoints but only via the on board serial port. The serial-to-usb converter didn't still work.

So if people experience no result trying to upload data to these old GP-30's from their notebooks and laptops. Then I think it could be a matter of these Low voltage ports not are able to provide the FURUNO device with enough voltage. See the above RS232 Tutorial.

Best Regards

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http://en.wikipedia.org/wiki/Image:USB_types_2.jpg

If you are using the USB port, you should have no need for setting COM ports.

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