Omega Vehicle Security OMB-NETSCAN 1500 User Manual download pdf (Page 191)

Appendix A

API Command Reference

NetScan User’s Manual A-51

- Set Counts, or Select Blocks

TYPE

Acquisition

EXECUTION

Deferred

SYNTAX

Ypre,post,

stop

When in

Normal mode

of data acquisition, set acquisition counts where

pre

is the pre-trigger count,

post

is the post-trigger count and

stop

is the

post-stop count.

Y0,count,0

When in

High-speed, single-channel mode (burst mode)

, set

count

; where

count

is the number of 256 sample blocks to be collected

Query current acquisition count selections.

DESCRIPTION

Normal Mode

When in

Normal mode

for data acquisition, the Set Counts (

) command can be used to select a pre-trigger,

post-trigger, and post-stop count to define the size of the acquisition. The pre-trigger count cannot exceed the

memory size, but the post-trigger count can. If the post-trigger count exceeds the memory size, it is the

responsibility of the controller to deplete the FIFO buffer as the data is being collected, or a buffer overrun error

will occur. A Post Stop Event Count can also be associated with an acquisition to collect a counted amount of

samples after the Stop Event occurs.

If a trigger is encountered before the pre-trigger count is satisfied, the unit will trigger but have fewer than the

specified pre-trigger count in its buffer. The Buffer Status String (

) command can be used to query the box for

the size of the pre-trigger. Although normal pre-trigger scans are acquired as soon as the acquisition is armed,

they are not available or valid until the start trigger event occurs.

Note: The unit can be configured to have different timebases for its pre-and post-trigger states. When the user-

specified trigger condition is satisfied, the unit goes from the pre-trigger to the post-trigger state, changing

its timebase, if configured to do so. Refer to the

Continuous, Gap-Free Acquisition with Two Timebases

Appendix C

for more information.

High-Speed, Single-Channel Mode

When in

High-speed, single-channel mode (burst mode)

;

count

(see syntax) is used to select the number of 256

sample blocks to collect. Valid values for

count

are as follows:

System Memory Post-Trigger Count*

256 Kbytes

512

1 Megabytes

2048

4 Megabytes

8192

8 Megabytes

16384

*In each case, the number assigned for block count must be a power of 2.

EXAMPLE for Normal Mode

PRINT#1, “Q1,0,1,1,1X”

‘ Set the reading separator flag ON

PRINT#1, “F0,0X”

‘ Data format is engineering units, degrees C

PRINT#1,"C1-4,1X"

‘ Configure channels 1 - 4 as T/C type J

PRINT#1,"I00:00:01.0, 0:00:00.1”

‘ Configure scan interval

PRINT#1,"Y100,1000,50X"

‘ Configure acquisition counts

PRINT#1,"N0 N2 X"

‘ Configure Event Status Register Bit (ESB) to be set when

pre-trigger count is satisfied

PRINT#1,"T1,8,0,0X"

‘ Configure acquisition, start trigger is Trigger On (

)

command, stop trigger is Counts

S% = 0

‘ Wait for the pre-trigger count to become satisfied

WHILE (S% AND 32) = 0

PRINT#1,"U1X"

INPUT#1,A$

S%=VAL(A$)

WEND

PRINT#1,"N0 N1 X"

‘ Configure ESB to be set when acquisition is complete

S% = 0

‘ Wait for the acquisition to become complete

WHILE (S% AND 32) = 0

PRINT#1,"U1X"

INPUT#1,A$

S%=VAL(A$)

WEND

PRINT#1,"U6X"

‘ Get Buffer Status String

LINE INPUT#1,A$

‘ Retrieve the response

PRINT A$

‘ Screen shows

0000001,0001151,-0000100,

10:02:02.0,04/24/93,00001000,

10:23:30.0,04/24/93,00001050,01

‘ Indicates that 100 pre-trigger scans were acquired 1000

post-trigger scans were acquired and 50 post-stop

scans were acquired

1 2 ... 186 187 188 189 190 191 192 193 194 195 196 ... 255 256

Omega Vehicle Security OMB-NETSCAN 1500 User Manual Page 191

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Omega Vehicle Security OMB-NETSCAN 1500 User Manual Page 191

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