Appendix D

ChartScan Program Examples

 

 

Until another key is pressed to exit the loop, the U4 command is issued and the high/low/last data is collected. The OUTPUT command sends U4 to the device, the ENTER command requests the data, then the QuickBASIC’s LINE INPUT gets the data from the IEEE 488 driver and places it in the variable U$. The FOR loop extracts the data for the individual channels from the string U$ and places them on the screen. Since format of the volts data is subtly different than that of the temperature data, two different FOR loops must be used to extract the channels data.

WHILE INKEY$ = “”

PRINT #1, “OUTPUT 07;U4X”

PRINT #1, “ENTER 07"

LINE INPUT #2, U$

FOR i = 1 TO 16

PRINT “High, Low and Last readings of Channel”; i

PRINT MID$(U$, (i * 66) - 65, 66) ‘Extract temp. data

NEXT i

FOR i = 1 TO 16

PRINT “High, Low and Last readings of Channel”; i + 16

PRINT MID$(U$, (32 * 66) + (i * 78) - 77, 78)

‘Extract volts data

NEXT i

WEND

Acquiring Pre- & Post-Trigger Data at Different Rates using SLOW_ACQ.BAS

The following program is SLOW_ACQ.BAS in the EXAMPLES directory. It will configure 32 temperature channels and then collect data as soon as it becomes available and post it on screen.

Although not necessary, it is good practice to reset the ChartScan at the beginning of your application by sending it the “*R” command and then waiting a few seconds.

CLS : PRINT “The ChartScan is resetting..”

PRINT #1, “OUTPUT 07;*RX”

SLEEP 4

To be certain that the reset was successful and the device is ready, serial poll the device until the proper status is returned.

WHILE (S% AND 4) = 0

PRINT #1, “SPOLL 07"

INPUT #2, S%

WEND

The C command will be used twice to configure a range of channels from 1 to 16 as Type J thermocouples and a range of channels from 17 to 32 as Type K thermocouples.

PRINT #1, “OUTPUT 07;C1-16,1X”

PRINT #1, “OUTPUT 07;C17-32,2X”

The Y command is used to configure the number of scans to take while in the different acquisition states. In this example, 30 scans are 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 event, set by the T command is set to Counted. This application does not use Counted, so this parameter is ignored.

PRINT #1, “OUTPUT 07;Y30,1,200X”

The I command sets the time between scans in hours-minutes-seconds format. The ChartScan can have two separate scan intervals, one that is used in the post-trigger state, and one that is used in all other states. 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 second (1 Hz).

PRINT #1, “OUTPUT 07;I00:00:01.0,00:00:0.3X”

ChartScan User’s Manual

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Omega Vehicle Security 1400 CLS Print The ChartScan is resetting, Print #1, Output 07C1-16,1X Print #1, Output 07C17-32,2X

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