Signametrics Corporation SM4020, Operator'S Manual

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Signametrics 52
and enable state. The ScanList must be pre-loaded prior to issuing this command. Make
sure the number of
SCANStep commands being issued does not exceed the loaded
contents of the scan list. Up to 192 points can be selected in this operation mode.
Parameter Type/Description
iScan int Identifies the Scanner being addressed.
Return Value
The return value is one of the following constants.
Value Meaning
SCAN_OKAY Operation successfully completed.
Negative Value Error code
Example
status = SCANStepCmd(0); //Step to the next point in the
//ScanList table
SCANStepCmd
H/W access Command
;
Polled Command
;
Description
Step to the next channel in the Scan List.
#include “SM4040.H”
int SCANStepCmd(int iScan )
Remarks
This is the polled version of the SCANStep function. It sends the command to the
Scanner but unlike SCANStep , it does not wait for completion of the selection operation.
SCANReady must be used in order to verify the selected channel is closed and the
scanner is ready for a new command. It is necessary for SCANReady to return TRUE
once for proper operation. For instance, if the actuation time is set to 10ms, and a wait of
100ms it taken following the execution of the
SCANSelectChannelCmd , it should not
be assumed the scanner is ready. SCANReady must be used and return TRUE to
proceed. SCANReady not only checks for readiness, but it also clears some registers in
preparations for the next command.
Parameter Type/Description
iScan int Identifies the Scanner being addressed.
Return Value
The return value is one of the following constants.
Value Meaning
SCAN_OKAY Operation successfully completed.
Negative Value Error code
Example
SCANStepCmd(0);
DMMSetRange(0,3V) //Set DMM to appropriate range
DMMRead(0, &Val); //Flush a reading or two
While( ! SCANReady(0)); // Wait for Scanner to be ready
DMMRead(0, &reading); // Read input