NI 6023E External Trigger

I am running Linux on a PC with LabView.  I am trying to get a 
National Instruments 6023E
card to take signal (waveform) data using an external trigger.  I 
have modified do_cmd.c as
follows:
cmd.start_src = TRIG_EXT;	(original was TRIG_NOW)
cmd.start_arg = 1;		(original was 0)

The vi hangs and none of the PFIn inputs trigger the card.  I expect 
PFI0 to be the trigger input.
The vi works when the code is set for TRIG_NOW.

Any suggestions?
Thanks,
Don Patterson
-- 

Donald M. Patterson            Voice: (512)-471-5648
Fusion Research Center      Fax:    (512)-471-8865
Univ of Texas, Austin, TX 78712
d.patterson_at_mail.utexas.edu

Received on 2003-02-10Z23:02:25