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Montana 650 intermittently connects to new computer


JoNanB

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Al my computers were working good and all worked with all my GPS receivers. Not being happy with this I recently purchased a new ASUS desktop and a SURFACE Pro 3. Both are running Windows 8.1, the Surface communicates with all my GPS receivers just fine. The ASUS however only intermittently connects to my Montana 650.

 

When I plug in the 650 into the ASUS, the computer beeps and device manager shows USB Mass Storage Device for a few seconds, it beeps again and device manager now says "Unknown USB Device (Device Descriptor Request Failed)".

 

The difference between my Surface and the ASUS is that the ASUS is about 4 times faster.

When a USB device is plugged into a computer, the computer notices there is a new device attached. At this point the computer sends the device a command to identify itself (This process is called enumeration) If the device responds too slowly or improperly "Unknown USB Device (Device Descriptor Request Failed)" is displayed in device manager.

 

To make matters worse Microsoft decided to help us again. Prior to Windows 8 Microsoft had been allowing much more time for the enumeration process than was required by the USB 2.0 specification. So to get faster start times for windows 8 Microsoft back the time of to just slightly more than the spec required. Problem is Microsoft forgot about all the USB devices made to work with windows under the longer enumeration time.

 

I spent about 8 hours researching and trying to get the Montana 650 to connect consistently to no avail. I was tired and it was after midnight and I was ready to give up. I look over and noticed the 4-port USB hub I purchased to expand the ports on the Surface and thought "What The HELL I've tried everything else!" So I plugged a DYNEX 4 PORT USB 2.0 HUB into my ASUS and the Montana into it. To my surprise the Montana is recognized and connects every time now.

 

I hope the helps somebody

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