Okay, let's see here. There are 24 channels organized into 6 banks of four
channels. The board reads data from a whole bank into the buffer even if you
only care about a single channel. The global input configuration is B.S. It
doesn't really do +2*Vref. The other pain in the butt aspect is that the data
is in 2's compliment format. The best way to fiddle with it is to hook up a
10k pot between +5v and ground on one of the first four channels and ground out
the other three so you don't get confused by what you're seeing. Then monitor
the numbers as they come across.
IMHO, the biggest drawback to this board is the sample rate. 100 ksps is about
as fast as you can go without overflowing the buffer. TS told me that this is
a PC/104 limitation even though the ADC chips can go much faster than this.
There is a basic C program on the TS FTP site to mess around with.
--- In "bladactania" <> wrote:
>
> Greetings all. I'm hoping you can help me. I'm pulling my hair out at the
> lack of documentation for the TS-ADC24. I'm using the board with a TS-5400
> (I know this group is for TS-7000 series but I don't know where else to
> turn!!). I've managed to make some progress despite the frustrating lack of
> supporting documentation. I figured it likely that you all might have some
> experience with this board and could help me figure it out...
>
> First of all, nowhere in the "Getting Started" sheet provided by TS, does it
> explain which channels the removable screw terminals are associated with.
> They're labeled a1-a4 and b1-b4 on each side. Any ideas?
>
> Secondly, in the doc, for the ADCCFG register I have 4 choices for Global
> Analog Input Range and they are 0 to +Vref, 0 to +2Vref, 0 to +2Vref, and 0
> to +2Vref. But it seems to be that really is just two options! What is the
> difference between the 3 0 to +2Vref options? I want the input range to be 0
> to 5v.
>
> The biggest issue I'm having is converting the data I get from the ADC FIFO
> to a voltage reading. When I connect one of the channels to a 0v, I never get
> a 0 reading. I've seen a few comments that the data may be in two's
> complement format or some other non-normal format. Any suggestions from this?
>
> Thank you VERY much for any help you can give and/or point me towards.
> Lee
>
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