IOtech MultiScan 1200, User Manual

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TempScan / MultiScan User's Manual Chapter 13: System Operation 205
Buffer
Empty
Empty
Read Pointer >
Scan -100
Scan -099
…
Trigger Block
1 Pre-Trigger
Scans
Trigger Scan > Scan 000
Scan 001
…
Stop Scan > Scan 400
Trigger Block
1 Post-Trigger
Scans
Scan 401
…
End Scan > Scan 650
Trigger Block
1 Post-Stop
Scans
Block 2
Block 3
Block 4
Scan 18660 > Block 5
Trigger Blocks
2 through 5
(3) The oldest complete Trigger Block in
the Acquisition Buffer has been read.
Part 3 – The oldest complete Trigger Block in the Acquisition Buffer has been read. The program example
demonstrates how the
R2
command will read the oldest complete Trigger Block currently residing in the buffer.
(1)
PRINT#1, “OUTPUT07;U6X”
(2)
PRINT#1, “ENTER07”
(3)
INPUT A$
0000006,0020215,-0000099,12:51:43.100,03/24/97,0001004,
13:53:01.300,03/24/97,0001254,01
(4)
PRINT#1, “OUTPUT07;R2X”
(5)
PRINT#1, “ENTER07”
(6)
INPUT A$
+0234.20 -0019.40 +0001.40 +0023.60...(etc)...
(7)
PRINT#1, “OUTPUT07;U6X”
(8)
PRINT#1, “ENTER07”
(9)
INPUT A$
0000005,0018860,-0000100,02:15:34.100,03/24/97,0000400,
04:51:10.300,03/24/97,0000650,01
• Line 1: Request the current status of the Acquisition Buffer.
•
Line 2: Retrieve the status.
•
Line 3: The screen will show the current status of the Acquisition Buffer.
Before the Trigger Block is read, the Buffer Status String response indicates that the total number of Trigger Blocks
available in the buffer is still 6, and the total number of scans available in the buffer is 20215 (20216-1).
Furthermore, it shows that the current location of the Read Pointer is at
Pre-Trigger scan -099 in the first Trigger
Block . This particular Trigger Block can be retrieved as follows:
• Line 4: Get the oldest complete Trigger Block .
• Line 5: Get the response.
•
Line 6: The screen will show the 1355 scans of data for each of the four (4) configured channels.
•
Line 7: Now, get the current status of the Acquisition Buffer.
• Line 8: Get the response.
• Line 9: The screen will show the new current status of the Acquisition Buffer.
Notice that after the Trigger Block is read, there are now 5 (6-1) Trigger Blocks and 18860 (20215-1355) scans
available in the buffer, and the current location of the Read Pointer is at Pre-Trigger scan -100 of the next current
Trigger Block . In addition, the following information has been updated to reflect this current Trigger Block : The
Time/Date stamping of the Trigger and Stop events, and the current locations of the Stop Event Pointer and End
Scan Pointer are now at Post-Trigger scans 400 and 650, respectively.
Read (R2) Buffer Operation – Multiple Trigger Blocks, Part 3 (of 4)