[time-nuts] Needed: The Real Serial USB Fix
paul swed
paulswedb at gmail.com
Sat Aug 24 10:27:41 EDT 2013
OK I may be late to the game here.
Using a great device to solve my rs232 port problems. Its a did TS serial
poer server.
They make them in 16 ports and smaller. Essentially it translates the ports
to ethernet and everything I have can then use the rs232 devices. The ports
stay put unlike USB thats been a pain actually. Multiple workstations and
such can access the ports. They can translate say port 16 so that it looks
like com3....
First 16 port was free. The 8 ports cost a wopping $5. Nobody knows what
these things are so no value.
I didn't till I stumbled into 1at work that was getting tossed and the
light bulb lit up.
Currently integrating them into the systems
Good luck
Paul
WB8TSL
On Sat, Aug 24, 2013 at 7:35 AM, Bob Camp <lists at rtty.us> wrote:
> Hi
>
> On Aug 24, 2013, at 3:27 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
>
> >
> >> If it were me, I remove the LCD display. I don't see a need when
> everyone
> >> today has a phone. the little AVR chip can bit-bang a UDP packet once
> per
> >> second and put it on your wifi router. That cuts the parts cost by
> 1/3rd
> >> and the display will be where you can see it, on the phone or computer.
> >
> > There are still a few of us who don't have cell phones. :(
> >
> > I split the problem into two areas:
> > Collecting the data
> > Displaying it
> >
> > If I'm collecting data, I want to be able to look back over hours, days,
> > months, or even years. That means I probably want to backup/archive it
> too.
> >
> > 100 characters of text every 10 seconds is under a megabyte per day.
> That's
> > small relative to modern disks, medium relative to thumb drives or SD
> cards
> > and small to medium relative to RAM (or ramdisk). [I generally chop
> things
> > up into a file per day.]
>
> That's a *lot* more than a simple monitor. Once you get past "simple" you
> already have LH and a lot of hardware that will run it just fine.
>
> Bob
>
> >
> > So far, I've always had a handy Linux box running 24x7 when I wanted to
> > collect data, so I've never tried to use a smaller system. Since the
> data is
> > collected on a real system, it's easy to display it any way I like.
> >
> > I won't be surprised if a project comes along where I want something
> like a
> > small uP to grab careful timing data. Until then, I'll keep collecting
> my
> > data on a real PC.
> >
> > ------------
> >
> > Does anybody have data on lifetime of Thumb/SD cards if you flush a log
> file
> > every 10 seconds?
> >
> > What type of file systems are supported with whatever OS comes with small
> > uPs? Is there any work on flash-friendly file systems for append-only
> log
> > files?
> >
> > A year or 3 ago, I did some work on logging to ramdisk and occasionally
> > copying to hard disk. The idea was that the hard disk would be spun-down
> > most of the time, saving a lot of power. It didn't save much so I
> bailed on
> > that project. I assume that means the power to keep the disk spinning
> is low
> > relative to the power to keep the electronics going. Maybe I just
> botched
> > the experiment.
> >
> >
> > flushing the file after each line is the simple way to make (mostly) sure
> > that your data gets to disk in case the system crashes, but it turns into
> > several disk writes each "line". That's no big deal for a lightly loaded
> > hard drive but gets interesting in terms of total writes to flash drives.
> >
> > You could, of course, fix the code to only do the flush once every N
> minutes,
> > or only when something interesting happens...
> >
> >
> > --
> > These are my opinions. I hate spam.
> >
> >
> >
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