> I was reading a computer magazine today, and saw reference
> to Pentium II systems that were being shipped with serial
> ports that were "USP compliant." I got the impression that
> specially-designed serial devices could be daisy-chained
> together on one of these ports, and that the problems of
> insufficient ports and conflicting irq's on contest radio
> lashups would be solved.
> Dave Hachadorian, K6LL
The reference is to the Universal Serial Bus, which is a new data bus and
low-level protocol. There's a good discussion of it in the latest
"Embedded Systems Programming", but I realize that it might be difficult
to find that rag in the rack at the grocery stores :-)
To sum it up, USB can handle data rates in two ranges: 10-100kbps and
100k-500kbps. It's designed to handle plug-and-play connections to PC
peripherals, such as keyboards, game controllers, audio, low-frame-rate
video, etc. It will NOT replace the RS-232-based serial ports currently
used for radio control, etc.
It's actually a very interesting protocol and I can see it being used in
the shack (eventually) to eliminate a great deal of the control and audio
cabling that creates the rats-nest of cables behind the table.
Manufacturers would have to put this bus into their devices and there
would have to be a "ham-shack" protocol written that would allow routing
of all the various signals to the proper destinations. A fun project for
someone that needs a hobby :-)
If you're interested in finding out more about the details of USB, there
were a couple of web page pointers in the article:
www.usb.org USB Implementer's Home Page
www.intel.com/embedded Good technical paper
Go for it!
73, Ward N0AX
CQ-Contest on WWW: http://www.contesting.com/_cq-contest/
Administrative requests: cq-contest-REQUEST@contesting.com