Thread Subject: MR-scanner synchronization - parallel port, interrupt

Dear Community,

I would like to receive triggering pulse from an MR scanner
(Siemens TIM Trio 3T)(when it acquires the scans) in Matlab
R2008a (Windows XP 32bit).

All I know, trigger comes via LPT1 (0x378), pin12. We also
use a device to produce a wider pulse then is present at the
scanner output.
Till now I tried to read each pins with Data Acquisition
Toolbox, but I have noticed no changes:
- port0, pin 0:7: all give 1
- port1, pin 0:4: none but 4 gives 1
- port2, pin 0:3: none but 2:3 gives 1
The other pins are not accessible (ground?)

I CAN read/write the port with Matlab (and Data
Acuisition Toolbox), but I do not know, how to use it to get
the trigger pulse from the scanner.

In Presentation, there is a setting about "Use Interrupts"
referring to IRQ 7, and we use it. Howcan I use it also in
Matlab?
Program Presentation works fine and accepts the signal. I
just want to make it work on Matlab too.

So can you give me any hint, what to do?

Thanks,
Tibor Auer, M.D.
Biomedizinische NMR Forschungs GmbH
am Max-Planck Institut f?r Biophysikalische Chemie
Am Fassberg 11
37077 G?ttingen
Germany
Mail: tibor.auer@gmail.com