In article <7sf6ap$gnq$1@nnrp1.deja.com>,Matthew Ho
wrote:
> I have to use Labview to take some data from other instruments.I would
> like to take some medical data like heart beat rate , blood pressure.
> However , i don't know which kind of methods can i use.As i know, i
can use Data Acquistion ,GPIB and Serial Port.What is the difference of
> them and which one method or other methods should i take ?
> I would like what condition i have to consider if the instrument can
be controlled by labview.Thank you.
It depends on the other instruments:
* if they have analogic outputs, you must collect data via an
acquisition system such as acquisition boards; and you will use Data
Acquisition functions.
* GPIB will work with intruments that have an IEEE488 comm
unication
interface (that is a specific port); your computer must have a GPIB
communication card installed too.
* you can collect data via a serial port if your instrument is able to
(usually, each computer has a serial port 😉
If you use GPIB or serial communication, your instrument might be able
to store data (in memory) because you can't collect high rate scanned
samples directly: communication is too slow. It's true if you want to
keep the shape information and dynamic of your blood pressure signal.
If you want to monitor mean values every second or less the serial port
is perfect for that.
With an acquisition board, you can sample the analogic signal into
digital values. depending on the instrument output signal (mean value
of rate and pressure or image of the sensor signal) your card must
accept high rate signal (or not).
In my opinion, for monitoring averaged datas or trends, and if your
instrument is able to, use serial port, or GPIB.
To keep dynamic information use an data
acquisition board.
Laurent.
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