IOtech MultiScan 1200, Руководство пользователя

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TempScan / MultiScan User's Manual Chapter 12: System Configuration 179
If the Post-Stop
stop
parameter of the Set Counts (
Y
) command is set to a non-zero value, the
TempScan/1100 or MultiScan/1200 will begin sampling Post-Stop data upon the occurrence of the
Stop event, and will acquire the specified number of Post-Stop scans.
When the specified number of Post-Stop scans have been collected, the unit will terminate the current
acquisition and return to a non-acquiring state. If, however, the Post-Stop
stop
parameter of the Set
Counts (
Y
) command is zero, the unit will return immediately to a non-acquiring state upon the
occurrence of the Stop event (unless the Auto Re-arm feature is used).
The Post-Stop state may be detected by querying the Stop Event Bit (Bit 1) and the Acquisition
Complete Bit (Bit 0) of the Event Status Register (
ESR
). If and only if the Stopped Bit (Bit 1) of the
ESR
is set, and the Acquisition Complete Bit (Bit 0) of the
ESR
is not set, then the TempScan/1100 or
MultiScan/1200 unit is in the Post-Stop state. The unit will exit the Post-Stop state when the specified
number of Post-Stop scans have been acquired. When this occurs, the Acquisition Complete Bit (Bit 0)
of the
ESR
will be set and the unit will return to a non-acquiring state (unless the Auto Re-arm feature is
used).
Continuous, Gap-Free Acquisition with Two Timebases
The TempScan/1100 or MultiScan/1200 unit can be configured to have different timebases for its Pre-
Trigger (normal scan interval) and Post-Trigger (acquisition scan interval) states. When the user-
specified Trigger condition is satisfied, the unit switches from the Pre-Trigger to the Post-Trigger
state, changing its timebase if configured to do so. This feature, along with Auto Re-arm , can be used
to collect continuous, gap-free data at two different timebases.
To ensure that the collected data is gap-free, the Pre-Trigger
pre
parameter of the Set Counts (
Y
)
command must be set to
-1
. If a value of
0
or higher is used as the Pre-Trigger
pre
value, then that
value is the maximum number of Pre-Trigger scans that can be placed in the Acquisition Buffer after
the Trigger condition is satisfied.