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 <> 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 <> 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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