Measurement Computing TempScan/1100 - Manual (Page 249)

TempScan / MultiScan User’s Manual 889897 API Command Reference A-53
T
- Set Trigger Configuration
TYPE Acquisition
EXECUTION Deferred
SYNTAX Tstart,
stop,
re-arm ,
sync
Configure an acquisition of scan data with the following parameters:
start is the start event and stop is the stop event
re-arm determines if the unit should continue acquiring after the first
acquisition completes, where 1 is on and 0 is off.
sync determines if acquisition events should be synchronized with the
internal timebases, where 1 is on and 0 is off.
T? Query the present trigger configuration
DESCRIPTION
The Set Trigger Configuration (
T ) command is used as the central command to assign the following events to the
TempScan/1100 or MultiScan/1200 unit: The Trigger (trigger start event) and the Stop (trigger stop event). The
Trigger and Stop may also be assigned different trigger sources. In addition, the Set Trigger Configuration (
T )
command also determines whether or not, after the initial acquisition, the acquisition will be re-enabled
automatically, and whether or not the Trigger (trigger start event) should be synchronized with the Pre-Trigger
scan interval.
Since the Set Trigger Configuration ( T ) command governs the configuration of an acquisition, all other acquisition-
dependent commands should be sent before the trigger sources are assigned via the Set Trigger Configuration
(
T ) command. The required acquisition-dependent commands will depend on the selected trigger sources. For
instance, if the unit is configured for Trigger On ( @ ) command, it will not be necessary to send the unrelated Set
Trigger Level ( L ) command.
The following table lists the valid trigger types and their associated commands prior to trigger configuration:
Trigger
Type
Trigger Source Description Required Commands Prior To
Trigger Configuration
Optional
Commands
Prior To
Trigger
Configuration
With Pre-
Trigger/ Post-
Stop Scans
Without Pre-
Trigger/ Post-
Stop Scans
0 None - Event Not Defined (N/A) (N/A) (N/A)
1 Trigger on ( @ ) Command I,Y I (N/A)
2 Trigger on GET (IEEE 488 only) I,Y I (N/A)
3 Trigger on TALK (IEEE 488 only) I,Y I (N/A)
4 Trigger on Channel Above Level I,Y,L I,L (N/A)
5 Trigger on Channel Below Level I,Y,L I,L (N/A)
6 Trigger on TTL Signal Rising I,Y I (N/A)
7 Trigger on TTL Signal Falling I,Y I (N/A)
8 Trigger on Count I,Y I,Y (N/A)
9 Trigger on Alarm Turning On I,Y,C I,C A
10 Trigger on Alarm Turning Off I,Y,C I,C A
11 Trigger on Absolute Time I,Y,P I,P (N/A)
The first parameter
start defines the Trigger (trigger start event) that is to take place in order for the unit to
begin acquiring Post-Trigger scans. Setting the start parameter to 0 will disable the acquiring of Post-Trigger
scans; this may be performed at any time during or after an acquisition. The start parameter will automatically
be set to 0 upon the termination of an acquisition unless the re-arm flag is set to 1 .
The second parameter stop defines the Stop (trigger stop event) that is to take place in order for the unit to stop
acquiring Post-Trigger scans. Setting the stop parameter to 0 will have the same effect as setting the stop
parameter to type 8 (Trigger on Count) with the Post-Stop count ( Y command) set to 0 . In both cases, the Post-
Trigger scans will be collected and the acquisition immediately terminated.
The third parameter re-arm defines the Auto Re-arm feature which determines whether successive acquisitions
will be re-enabled automatically, or remain disabled after the initial acquisition has terminated.
The fourth parameter sync defines the trigger synchronization flag which determines whether the Trigger will be
synchronized with the Pre-Trigger scan interval ( I command), or begin as soon as the Trigger is detected,
regardless of the exact time it occurred.