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Dear Colleagues,
Thanks to all those who replied to my original message. We have set the =
external triggering as follows:
Pin 5 of the 10 pin IDC connector on the process controller is the =
external trigger. Pin 10 in the same connector is the ground. The =
following code could be controlled externally and the sequence did not =
run until pin 5 was grounded to pin 10:
START, CALL WAIT
RESTRT, 1M
{INSERT YOUR PULSE PROGRAM HERE}
....
...
...
GOTO START
WAIT, D30 IF XTRIG GOTO START =20
D30 IF NOT XTRIG GOTO RESTRT=20
RETURN
This does not exactly square with what I read in one of the Bruker =
manuals where XTRIG is meant to be true when pin 5 is logical low and =
false otherwise but it works.
Another slightly odd feature (to me at least, I'm a mechanical engineer =
not electronic specialist) was that when pin 5 was not grounded, the =
voltage difference between pin 5 and ground was 1.6 V which is =
indeterminate in TTL systems. I would have expected it to be pulled to =
5V. But anyway, I've been able to get it to work for the job we need to =
do so thanks again to those who supplied information.
Regards,
Lachlan Graham
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