Hello

First of all make sure you have the latest kernel run
rpi-update(google how to install it). This is a big improvement in usb
functioning.
I looked at the site and it seems that your adapter is an DS2483 with
some usb serial adapter. This is not a good solution. I personally
does not have any experience with those but I've read people have
problems with usb serial adapters like FT232.

Second you could also try to force usb 1.1 this should help however
the LAN(it's also on USB bus) performance could be limited.
dwc_otg.speed=1
http://raspberrypi.stackexchange.com/questions/1886/what-kernel-parameters-are-available-for-fixing-usb-problems



I doubt it's a power problem. If your power supply is truly 2A. You
can check the voltage on the board TP1 TP2.
Which version of Raspi board do you have? The most recent ones have
usb polyfuses removed so there shouldn't be any significant voltage
drops with good power supply.
I run a power hungry 3G modem directly form little modified first
version of Raspi. 1 ohm resistors added over usb polyfuses and some
extra caps.Here is the thread with modifications
http://www.raspberrypi.org/phpBB3/viewtopic.php?f=63&t=8591&p=210186#p210186
I have a "original" power supply from RS Components.
I can even plug and unplug the modem and Raspi does not restart.
Raspi(v2) usb ports are directly connected to 5V rail so when you
connect some device which has ceramic capacitors inside(almost every
device) they start to charge. Those caps can charge very fast so for
fractions it's like a shot circuit. For more detail information you
can read the thread it's explained there why this works. Or ask here I
will try to explain it however I'm not an trained electronic engineer.


There where sucess reports of usb 1-wire adapters here but I can't
rememberer exactly which one it was. Perhaps the "native" DS2490.




-- 
p4trykx

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