Re: [ts-7000] TS-7500 / TS-752 Basic questions

[Alex McLain <>]

Hi Jim,

If you look at the TS-752 schematic, 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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