IOtech MultiScan 1200, User Manual

Page: 191 / 364

TempScan / MultiScan User's Manual Chapter 12: System Configuration 181
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Auto Re-arm: This parameter is the feature which determines whether or not, after the initial
acquisition, the acquisition will be re-enabled automatically. If the Auto Re-arm feature is in use,
the TempScan/1100 or MultiScan/1200 unit will immediately begin looking for another Trigger
event once a Stop event and Post-Stop count are detected to indicate that the current acquisition
has terminated. When the next Trigger is detected, a new acquisition with the same channel
configuration will be enabled automatically. Otherwise, if this feature is not in use, and the initial
acquisition has terminated, a
Set Trigger Configuration (
T
) command must be issued after a Stop
event, before the unit can begin looking for a Trigger .
However, using Auto Re-arm does not allow you to change the Trigger configuration between
Triggers . Consequently, the initial configuration will be used until the Auto Re-arm is disabled.
To disable the Auto Re-arm flag, a Set Trigger Configuration (
T
) command must be issued with
the
re-arm
parameter set to zero. Data will still be available after the
T
command is issued.
•
Trigger Synchronization: This parameter is a flag which determines whether or not the Trigger
(trigger start event) should be synchronized with the Pre-Trigger scan interval, provided that both
the Pre-Trigger count and normal scan interval are configured via the Set Counts ( Y ) and Set Scan
Interval ( I ) commands, respectively. If this flag is set, then the Trigger scans will begin on the
next "tick" of the Pre-Trigger scan interval, regardless of the exact point in time when the actual
Trigger occurred. So, if the actual Trigger occurs between "ticks" of the Pre-Trigger scan
interval, then the acquisition will not begin until the next "tick" of the Pre-Trigger scan interval.
Otherwise, the acquisition of Post-Trigger scans will begin independently at the exact point when
the Trigger (trigger start event) is detected.
Trigger Start & Stop Event Sources
As already mentioned, the TempScan/1100 or MultiScan/1200 can be configured so that the Trigger
and Stop are assigned different trigger sources. However, 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.