Operator`s manual

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.
R
eturn Value The ret
urn 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 Th
is is th
e 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.
R
eturn Value The ret
urn 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