[clug] USB to serial port adapter
Alex Satrapa
grail at goldweb.com.au
Sat Jul 10 04:40:19 GMT 2004
On 9 Jul 2004, at 15:55, Dale Shaw wrote:
> Can anyone recommend a USB to serial port adapter ...The
> keyspan one looks alright - anyone got one?
I have been using the Keyspan USA-19 ("USB PDA Adaptor") for as long as
I've had my Palm V, but only under Mac OS X.
For whatever reason, I've had problems when plugging it in - it will
randomly cause all other devices on the USB hub to reset. I think it's
drawing too much power for a bus-powered device, but only when being
plugged in and never after it's been running for a while (I expect
there's some component inside that draws a too-large amount of startup
current). This gets quite distressing when I plug the PDA adaptor into
the second port on the iMac itself (the one that my main USB hub isn't
plugged into), and I lose everything - keyboard, mouse, mounted CF
cards.
I've even bought a second USB hub thinking it was my original USB hub
that was at fault. Eventually I just got used to the idea of having to
individually reconnect my devices when this happens. I've tried this
adaptor under Linux too, and I got the same behaviour on that Epox
motherboard (USB bus would reset, and I'd have to reconnect all devices
to see them again). Under Linux the behaviour was more distressing
because usbmgr would have a chance to run the device-disconnect
scripts. I don't know if that's changed recently.
The worst bit is that this behaviour is not the kind you can try to
detect in advance, unless your vendor is prepared to let you take the
thing out of the box and plug-and-play. The advantages of
bricks-and-mortar stores over online shopping are really becoming
painfully obvious.
HTH
Alex Satrapa
"Everyone has 20/20 vision in hindsight" -- Old Proverb
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