Could you also give use the part numbers and measurements of the
Hammond Boxes that fit the 7400?
Will you sell the boxes so we can buy everything from you including
the special endplates? We don't care if you charge more than Digikey.
Especially for foreign buyers, much easier to buy everything in one
place with the board in the case.
>From the hammond site, it looks like these two will fit the 7400, is
that right?:
http://www.hammondmfg.com/1455.htm
1455J1201
Inches 4.72 x 3.07 x 1.06
1455K1201
Inches 4.72 x 3.07 x 1.69
The din rail clips would be a nice accessory since these would often
get mounted in a cabinet.
Don.
On 9/10/06, Jesse Off <> wrote:
>
>
>
>
>
>
>
>
> --- In "Don W. Carr" <> wrote:
> >
> > For me, the best thing you could add is two high speed counters,
> and extra
> > serial ports. I have a project that needs 5 serial ports, 2 high
> speed
> > counters, and some DIO, and this little board would be perfect if
> we could
> > do that. By the way, we really like the way you count transitions
> instead of
> > cycles since that cuts the error for frequency calculations in
> half! We
> > would even be willing to pay for the mods.
>
>
> Could you elaborate on the high speed counters? Do you mean a free-
> running register in memory space counting upwards or a frequency
> counter watching a DIO pin?
>
> With a custom FPGA, we can strip down features you tell us you don't
> need and make some more room for things you do. I'm not sure I can
> fit 3 extra UARTs, SD card core, NAND controller core, boilerplate
> glue logic and frequency counters all in a 570 LUT CPLD/FPGA, but if
> you're willing to give up SD and boot to NAND flash it would be no
> problem.
>
>
> >
> > I like the XDIO, but I think it would be better if you could still
> use the
> > other DIO when the counters are used, and also you need a longer
> register
> > for the PWM high/low times so we can hit all frequencies +/-0.05%
> duty
> > cycle.
>
>
> By counters do you mean the little "trick" you can do to loopback PWM
> to the pulse-counter for an arbitrary freq free-running counter?
> This indeed will tie up the PWM pin and feature and the pulse timer
> feature, but other GPIO's and features should still be useable.
>
>
> >
> > When will you have a case? We would like room for a signal
> conditioning
> > board in the case like you have with your other cases.
>
>
> This board is a standard size that fits into some very inexpensive
> off-the-shelf extruded aluminum cases. We only have to do custom
> metal and screening work on the endplates and they should be here
> this week. I'm not sure theres room in the smallest case we're
> supporting for a "daughterboard" with a mating 40 pin female
> connector. What would work though would be to just solder your board
> to the .1" headers directly. This would get you an extremely rugged
> device with a very low stack height.
>
> We used the .1" headers partially for the reason that they would be
> easy to solder a daughterboard directly to. We were thinking about
> doing an edge connector like a SIMM socket or a high density hirose
> style connector, but came to the conclusion that would just be
> idiotic for targetting ruggedness. Edge connectors are mechanically
> weak and unwieldy (there was a reason PC/104 went the way it did
> rather than stay with the PC card-edge slots). Those high-density
> connectors aren't much better and some were only rated for 50 mate
> cycles! Granted they'd likely only be mated once, but that just
> doesn't sound like a reliable connector to me, so instead we put
> the .1" pin header on and tons of mounting holes.
>
> We really like these extruded aluminum enclosures. An advantage
> besides being inexpensive is that they are extremely strong-- you
> could probably run one of these things over with a truck without it
> collapsing! We will definitely be testing that once they come in.
>
> P.S.
> Our production workers say you stopped by our office a month or so
> ago to pick up some boards-- wish you would have dropped by in Bob's
> or my office before you left, as we would have liked to have met you!
>
> //Jesse Off
>
>
>
>
--
Dr. Don W. Carr
J. G. Montenegro 2258
Guadalajara, Mexico
+52-333-630-0704
+52-333-836-4500 ext 2930
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