IOtech MultiScan 1200, Руководство пользователя

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TempScan / MultiScan User's Manual Chapter 15: Program Examples 245
(42)
PRINT #1 “OUTPUT 07; R1X”
PRINT #1 “ENTER 07”
INPUT #2, READINGS$
LOCATE 7, 1: PRINT “The scan”; i; “was:”; READINGS$
PRINT #1, “OUTPUT 07; UOX:
PRINT #1, :ENTER07”
OUTPUT #2, U%
IF U% = 1 THEN END
(50)
WEND
This program is
SLOW_ACQ.BAS
in the
\EXAMPLES\
subdirectory. It will configure 64 thermocouple
channels, collect the data as soon as it becomes available, and post it on the screen.
•
Lines 1-3: Although not necessary, it is good practice to reset the TempScan/1100 at the start of
your application by sending the Reset Power-On (
*R
) command. Wait a few seconds.
•
Lines 4-7: To be certain that the reset was successful and the device is ready, Serial Poll the device
until the proper status is returned.
•
Lines 8-9: The Configure Channels (
C
) command will be used once to configure a range of
channels from 1 to 32 as Type J thermocouples, and used again to configure a range of channels
from 33 to 64 as Type K thermocouples.
•
Line 10: The Set Counts (
Y
) command is used to configure the number of scans to take while in
the different acquisition states. In this example, 30 scans will be taken while in the Pre-Trigger
state, 1 while in the Post-Trigger state, and 200 while in the Post-Stop state. The Post-Trigger
count is only valid when the Stop (trigger stop event) is set to Count via the Set Trigger
Configuration (
T
) command. This example does not use Count, so this parameter is ignored.
•
Line 11: The Set Scan Interval (
I
) command sets the time period between scans in hours-minutes-
seconds format. The TempScan/1100 can have two different scan intervals, one for the Post-
Trigger state (acquisition scan interval), and one for the Pre-Trigger and Post-Stop states (normal
scan interval). This example sets up the Post-Trigger scan interval to 0.3 seconds (3.33 Hz), and
the Pre-Trigger and Post-Stop scan intervals to 1.0 second (1.0 Hz).
•
Line 12: The Set Trigger Configuration (
T
) command sets up the Trigger (trigger start event ) and
Stop (trigger stop event) parameters for the acquisition. In this example, the Trigger and Stop are
both assigned the Trigger On (
@
) command character as sent by the controller. The Auto Re-arm
flag is disabled, so that the TempScan/1100 will not re-arm itself for another acquisition after the
first acquisition is complete. The synchronization flag is also disabled, so the TempScan/1100 will
not re-synchronize itself to the
Trigger point when the Trigger (trigger start event) begins. When
the TempScan/1100 encounters the Execute (
X
) command, it will be armed and will start the
collection of the Pre-Trigger data.
•
Lines 13-16: The next four lines prompt you to hit a key to trigger the TempScan/1100
acquisition. When a key is hit, the Trigger On (
@
) command character is sent as the Trigger .
•
Lines 17-31: While in the Post-Trigger state, this program will first check for an available scan via
a Serial Poll of the TempScan/1100, and will then compare the response with an 8. If a scan is
available, the
R1
command tells the TempScan/1100 to send the oldest scan to the IEEE 488
controller. The command
ENTER
requests the response data from the TempScan/1100. The
command
INPUT
places the retrieved data into the variable
READINGS$
. Since the acquisition is
slow and the buffer in the TempScan/1100 can be made very large, this program can go off to
other foreground tasks while the TempScan/1100 is acquiring data, and only occasionally query
the unit and collect its data.
•
Line 32: When a key is hit once again to stop the current acquisition, the program proceeds to the
next block where the Trigger On (
@
) command character is sent once again. This time, the
character is sent as the Stop , ending the Post-Trigger state and entering the Post-Stop state.
•
Lines 33-50: Now the collection of the Post-Stop data begins by querying for new scans and
requesting the data. The program is done when the acquisition is complete.