[PLUG] Experiences with USB "null modem" cables.
Thomas Groman
tgrom.automail at nuegia.net
Sat Jun 2 03:56:56 UTC 2018
On Fri, 1 Jun 2018 04:17:06 -0500
Richard Owlett <rowlett at cloud85.net> wrote:
> On 05/31/2018 09:12 AM, Johnathan Mantey wrote:
> > Richard,
> > Is there a reason you don't use point to point RJ45 ethernet?
>
> YEPP ;/
>
> > If a PC has USB it almost always has RJ45 ethernet.
>
> As you say "*almost*"
>
> > If neither side has MDIX then RJ45
> > crossover cables are available to complete the connection. Why do
> > you have an affinity for USB cable solutions?
>
> I summary my absolute required elements include all below:
> existence
> known to work
> conveniently physicallt available
>
> I'll admit there also are some preferences:
> scratch an itch that has existed since days of USB 1.0
> explore an un-explored realm
>
> And winner is USB "null modem" cable ;}
>
>
>
> >
> > On Thu, May 31, 2018 at 2:39 AM, Russell Senior
> > <russell at personaltelco.net> wrote:
> >
> >> Good luck!
> >>
> >> On Thu, May 31, 2018 at 2:17 AM, Richard Owlett
> >> <rowlett at cloud85.net> wrote:
> >>
> >>> On 05/30/2018 03:43 PM, Russell Senior wrote:
> >>>
> >>>> The one I have implements a USB-net interface,
> >>>>
> >>>
> >>> I did a DuckDuckGo search for "USB-net interface" {with/without
> >>> quotes}. Found several interesting links, but not sure if any are
> >>> what you are speaking of. A link to specific device(s) you refer
> >>> to?
> >>>
> >>> so it's effectively an ethernet cable.
> >>>>
> >>>
> >>> I purposely used the term "null modem". I date from an
> >>> era/industry
> >> where
> >>> where 20 mA current loop was preferred over RS-232C for its
> >>> noise
> >> immunity.
> >>> Since USB 1.0 I've considered "universal" of USB an unfortunate
> >>> choice of adjectives. The intrinsic implementation of hardware to
> >>> forever be
> >> either a
> >>> *MASTER* or slave is annoying.
> >>>
> >>> Most modern distributions just work. The one you link is
> >>>> a USB-to-serial-to USB. That is not ideal for transferring
> >>>> files.
> >>>
> >>> Depends on your metric.
> >>>
> >>> If you
> >>>> are unclear on what the "link" cable supports, you can always
> >>>> just buy
> >> two
> >>>> usb-ethernet adapters and an ethernet cable to go in the middle.
> >>>>
> >>> That explicitly is to be avoided as an unnecessary complication.
> >>>
> >>> Maybe more adpatable than a "link cable".
> >>>>
> >>>
> >>> I want a USB cable that is as functional (my metric) as a RS-232
> >>> cable of decades past. The only observable difference would be
> >>> max available
> >> speed.
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>> On Wed, May 30, 2018 at 12:49 PM, Richard Owlett
> >>>> <rowlett at cloud85.net> wrote:
> >>>>
> >>>> ARGHHH. New it was going to be that kind of day ;/
> >>>>> Any problems &/or comments?
> >>>>>
> >>>>>
> >>>>>
> >>>>> On 05/30/2018 01:53 PM, Russell Senior wrote:
> >>>>>
> >>>>> Yes
> >>>>>>
> >>>>>> On Wed, May 30, 2018, 10:54 Richard Owlett
> >>>>>> <rowlett at cloud85.net>
> >> wrote:
> >>>>>>
> >>>>>> I've come across a "USB Null Modem Cable" by Future Technology
> >>>>>> Devices
> >>>>>>> International
> >>>>>>> [http://www.ftdichip.com/Products/Cables/USBtoUSB.htm
> >> ].
> >>>>>>>
> >>>>>>> It would seem an appropriate solution for some file sharing
> >>>>>>> between
> >> two
> >>>>>>> Linux machines which have only USB 2.0 in common.
> >>>>>>>
> >>>>>>> Has anyone used this or a similar product.
> >>>>>>> TIA
> >>>>>>>
> >>>>>>>
>
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If your using one of those fad or cheapo laptops with no IO but WiFi,
you could use a ptp wireless link too
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