Omega Engineering OMB-CHARTSCAN 1400 User Manual page 181

Appendix A
(1) The first parameter,
scans. This event is referred to as the Start Trigger. When the unit has recognized that a Start Trigger has been
encountered, it will begin acquiring scans at that point. The first of these scans, the Start Trigger scan, will be
time/date stamped for later reference. Also, when the Start Trigger is recognized, the Triggered Bit (
Status Byte will be set and the TRIGGER light on the front panel will turn on.
Setting the
after an acquisition. The
unless the re-arm flag is set to
Note: If the trigger start event is level or alarm, at least one pre-trigger scan must be programmed to initiate
(2) The second parameter,
scans. This event is referred to as the Stop Trigger. When the unit has recognized that a Stop Trigger has been
encountered, it will stop acquiring scans at that point (unless post-stop count is defined; see
last scan collected, the Stop Trigger scan, will be time/date stamped for later reference. Also, when the Stop
Trigger is recognized, the Trigger Bit (
panel will turn off.
Setting the
with Post-Stop Count (
acquisition immediately terminated.
(3) The third parameter,
automatically. If this parameter is set, then after the Stop Trigger is recognized and the acquisition terminated a
new acquisition (with the same configuration) will be enabled automatically. In other words, after the termination
of the previous acquisition, the unit will immediately begin another acquisition of the same configuration.
Otherwise, if the parameter is not set, new acquisitions will remain disabled after the initial acquisition has
terminated.
(4) The fourth parameter,
Trigger Scan Interval (
be examined to determine if the Start Trigger should be synchronized with the internal Pre-Trigger Timebase
Interval. If so, then the Start Trigger, regardless of what point in time it occurred, will be synchronized with the
next occurrence of the Pre-Trigger Scan Interval "tick." In other words, if the real Start Trigger occurs between
Pre-Trigger Scan Interval "ticks," then the acquisition will not begin until the next "tick" of the Pre-Trigger Scan
Interval. Otherwise, the acquisition will begin as soon as the Start Trigger is encountered.
EXAMPLE
PRINT#1, "OUTPUT07; I12:00:00:0,
00:01:00.0X"
PRINT#1, "OUTPUT07;Y100,10000,0X"
PRINT#1, "OUTPUT07;T1,7,0,1X"
PRINT#1, "OUTPUT07;@X"
ChartScan User's Manual
, defines the event that is to take place in order for the unit to begin acquiring
start
parameter to will disable the acquiring of scan; this may be performed at any time during or
start 0
parameter will automatically be set to
start
.
1
scanning in order for the event to be recognized.
, defines the event that is to take place in order for the unit to stop acquiring
stop
02
parameter to will have the same effect as setting the
stop 0
) command set to
Y
, determines if, after the initial acquisition, the acquisition should be re-enabled
re-arm
, determines if the Start Trigger should be synchronized with the internal Pre-
sync
) command value. If the Pre-Trigger Count (
I
) of the Status Byte will be cleared and the TRIGGER light on the front
. In both cases, the Start Trigger scan will be collected and the
0
Y
' Collect scans once every 12 hours then when Start
Trigger occurs collect them once every minute
' Set pre-trigger count to 100, post-trigger count to 10000
and define no post-stop count
' Start Trigger On (
trigger count (10000) and synchronize the Start
Trigger to the pre-trigger timebase interval
' Issue Start Trigger (acquisition may begin as much as 12
hours from now because we synchronized with pre-
trigger timebase interval)
upon the termination of an acquisition
0
command). The
Y
parameter to (Stop on Count)
stop 1
) command is defined, this parameter will
) command, Stop Trigger on post-
@
API Commands
) of the
02
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