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Re: USB "null modem" cables and related Linux driver questions




On Fri, 1 Jun 2018 10:01:57 -0400
Michael Stone <mstone@xxxxxxxxxx> wrote:

> On Fri, Jun 01, 2018 at 04:56:32AM -0500, Richard Owlett wrote:
> >On 05/31/2018 06:58 PM, David Wright wrote:  
> >>(thanks for your link) gives an idea of the price, and in this case
> >>I can see some justification for it because they describe the
> >>electronics hidden inside the plugs (we hope).
> >>
> >>But considering that two NICs cost less than that cable, I'd need a
> >>pressing reason to purchase the cable instead.  
> >
> >There is a perceived elegance aspect.
> >There is also a practical aspect the only known working and 
> >conveniently physically accessible ports are USB.  
> 
> USB-Ethernet dongles would be a lot more useful in the long term than 
> USB-Serial dongles. RS-232 had a really good 40 year run, but for 
> general communications it was mostly obsolete nearly 20 years ago.
> You mentioned file transfers--I can't think of any applications where
> that's going to be better over a pair of USB-Serial dongles than a
> pair of USB-Ethernet dongles.
> 
>
Radio? This gadget:

https://www.lensadaptor.com/mtf-effect-control-unit-3-kit

 uses straight point-to-point 8-bit serial over Zigbee type RF
tranceivers. Bluetooth is basically 8-bit serial over radio, though
with a very short range.

-- 
Joe
https://en.wikipedia.org/wiki/Zigbee