never mind. I get it now I think. duh
--- In "jsimmermon" <> wrote:
>
> The site says that the 8 dry contacts are rated at 24V. I have only a little
> experience with electronics. I thought that the schematics showed a resistor
> that would protect the circuit. Did I misunderstand that? Also, if they are
> dry contacts, why is there a charge on them?
>
> I need to use this device to count pulses from a meter.
>
> I am sure you can tell that I am pretty new to this stuff, but I am trying to
> learn what I don't know. Thanks in advance for your advice.
>
>
>
>
>
> --- In Alex McLain <alex@> wrote:
> >
> > Hi Jim,
> >
> > If you look at the TS-752
> > schematic<http://www.embeddedarm.com/documentation/ts-752-schematic.pdf>,
> > the digital inputs exposed on the enclosure are pulled high internally. If
> > you connect them to ground you should read a 0.
> >
> > Also, I'd take out that 9V battery before you fry the poor little level
> > shifter at the end of those inputs. The TS-7500 is pretty much a 3.3V
> > device, with parts of it being tolerant of or operating at 5V. The
> > schematics do a pretty good job of showing what voltage each section
> > operates at.
> >
> > And here's the TS-7500 schematic as well:
> > http://www.embeddedarm.com/documentation/ts-7500-schematic.pdf
> >
> > -Alex
> >
> >
> > On Mon, Oct 8, 2012 at 2:03 PM, jsimmermon <dacarys@> wrote:
> >
> > > **
> > >
> > >
> > > I have a TS-7500 and a TS-752 baseboard. I have wired up a momentary
> > > button using a 9V battery to hook negative the input ground terminal and
> > > positive to input terminal 8 on the TS-752. When I read the pin (PIN 26)
> > > with the switch off, I get a value of 1. When I hold the momentary button
> > > down, I still get a value of 1. I am using the Dio.c sample application to
> > > get the values.
> > >
> > > Am I doing something wrong here? Do I understand correctly that it should
> > > read the completed circuit as pulled high? Or am I just really confused?
> > >
> > > I am able to control the switch by setting PIN 39 to 1 using the same
> > > sample app. When the pin is set high, I can read using the procedure above
> > > on PIN 39 and get 1, when I reset the relay, I read and get 0 as I would
> > > expect.
> > >
> > > This my first attempt at reading inputs on a board like this. Thanks in
> > > advance for your help.
> > >
> > > Jim
> > >
> > >
> > >
> >
>
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