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Re: any known working USB/serial converters? [drifting off...]



fred smith wrote:
On Tue, Jul 07, 2009 at 11:00:26AM -0700, Rick Stevens wrote:
Robert P. J. Day wrote:
On Tue, 7 Jul 2009, Gene Heskett wrote:

On Tuesday 07 July 2009, Robert P. J. Day wrote:
a while back, i was whining about the lack of functionality of a
particular USB/serial converter:

http://osdir.com/ml/fedora-test-list/2009-05/msg00398.html

does anyone have such a converter that just plain works out of the
box?  i'm more than happy to buy and try another brand if it's the
prolific product that's causing the trouble.

prolific adapters are well known trouble.  FTDI seem to be pretty
transparent. I have several that Just Work(TM).
 that's what i vaguely recall hearing once upon a time, so it's nice
to have at least a bit of confirmation that i should hie me hence to
the geek store and pick up another brand to test. thanks.
I also use an FTDI unit which hasn't failed me.  Uses the ftdi_sio
module and is identified as a FTCEGM4N in dmesg (USB ID 0403:6001).

Do these things work "both ways?" i.e., I assume they would work if one
plugged the USB end into one's computer and got serial out the other end.
But how about plugging the usb end into, e.g., a UPS and taking the serial
end back to the linux box?

It should work, provided the UPS knew how to talk to the USB side of the
device (e.g. had a driver for it, etc.).  There's nothing special about
a computer's USB port as opposed to some other device with a USB port.

someone earlier mentioned a tripplite UPS which got me to thinking of
that situation: tripplite no longer offers USB-compatible software for
Linux--their linux versions are still serial only. makes one wonder if
one of these things would bridge the gap.

If you were to do a UPS->USB->SERIAL<->SERIAL->USB->computer thing,
you'd need a female-female null-modem adapter between the serial ports,
of course.
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