Read Buffered Data, While S% and 8 = | Omega Vehicle Security 1400

Appendix A	API Commands

R- Read Buffered Data

TYPE	Buffer
EXECUTION	Immediate
SYNTAX	Rtype	Read scan data from the acquisition buffer where type is the type of data
		request being made. Valid options for type are: 1 - Read the oldest scan
		currently residing in the acquisition buffer, 2 - Read the oldest complete
		trigger block currently residing in the acquisition buffer, and 3 - Read all the
		scan data that currently resides in the acquisition buffer.
	R?	Query the contents of the data buffer.
DESCRIPTION

The Read Buffered Data (R) command may only be used to extract data from the acquisition buffer which has been collected as a result of an acquisition that has been previously configured. For more information regarding the configuration of acquisitions, refer to the Set Trigger Configuration (T) command.

Since the unit’s buffer is organized as a FIFO (first in, first out), the Read Buffer Data command will always read the oldest data available in the buffer first. As the controller requests buffer scan data, the unit supplies the oldest available scan. After the scan is supplied, that scan is no longer available. As scan data is read from the acquisition buffer, the data is removed from the buffer and, thereafter, may not be referenced or read.

This command operates as follows: When a Read Buffer Data (R) command is interpreted, the requested scan data, if it exists, is moved, one scan at a time, from the Acquisition Buffer to the output queue where it will wait in state until you remove it. Once the data is removed from the output queue, the next Read Buffered Data command may be issued.

Note: If the appropriate amount of scan data is not in the acquisition buffer at the time these commands are issued, a conflict error will result.

The Scan Available bit in the Status Byte (STB) register may be queried or Serial Polled to determine if there is any buffer scan data available. For a more complete description of how much data is available in the acquisition buffer at any particular time, the Buffer Status String (U6) command may be issued.

The Set Query Terminators (Q) command determines the format for the terminators for acquisition buffer data. For more information regarding the acquisition buffer terminators, refer to the Set Query Terminators (Q) command.

Note: In High-speed, single-channel (burst mode), “scan” means one block of 256 samples.

EXAMPLE

S% = 0	‘ Wait for a scan
While (S% and 8) = 0
PRINT#1 “SPOLL07"
INPUT#2, S%
WEND
PRINT#1,"OUTPUT07;R1X"	‘ Get the scan
PRINT#1,"ENTER07"
LINE INPUT#2, A$

ChartScan User’s Manual

A-51

1400 specifications

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Omega Vehicle Security 1400 manual Read Buffered Data, While S% and 8 =, ‘ Get the scan

Models: 1400

R- Read Buffered Data

Rtype

DESCRIPTION

While (S% and 8) = 0

PRINT#1 “SPOLL07"

INPUT#2, S%

WEND

PRINT#1,"OUTPUT07;R1X"

‘ Get the scan

PRINT#1,"ENTER07"

LINE INPUT#2, A$

ChartScan User’s Manual

1400 specifications