Signametrics Corporation SM4020, Руководство оператора

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Signametrics 32
SCANAutoScan
H/W access Command
;
Polled Command
;
Description Initiate AutoScan operation.
#include “SM4040.H”
int SCANAutoScan ( int iScan, int iPoints )
Remarks
Run Auto Scan procedure from the Scanner's stored ScanList. This operation is carried
out by the scanner’s on-board processor. It uses the Scan List table and timing
parameters to perform a complete scan sequence. If necessary, the scan may be
terminated by sending the
SCANAbort() command. The Scanner scans iPoints of
consecutive locations from the ScanList, starting with the point stored in location 0, and
up to location 191 (max of 192 for
iPoints ). Steptime and Actuation time values must be
set prior to executing this function. The Scan List must contain channel information for
at least
iPoints prior to using this command. Steptime must be greater than the Actuation
time. This function is not applicable for the following configurations: Universal and
Disabled .
Being a polled function, following this command uses SCANReady() to test for
completion of the operation. No new H/W access command should be issued prior to
SCANReady() return of TRUE . An exception is the SCANAbor() command which
terminates the current operation.. Following reception of this command, the Scanner
hardware enters a busy state. When
SCANReady() returns TRUE do not use it again.
Parameter Type/Description
iScan int Identifies the Scanner. Scanners are numbered starting with zero.
iPoints int The number of points in the scan. This number must be between 1
and 192, inclusive.
Return Value The return value is one of the following constants.
Value Meaning
SCAN_OKAY Operation successfully terminated
Negative Value Error code.
Example
i = SCANAutoScan(0,22); // Scan 22 points;
while(!SCANReady(0)); // Wait for completion of scan