Rockwell Automation 1747-PCIS API Software - Open Controller - Manual (Page 118)

Publication 1747-UM002A-US-P - June 2000
6-58 Library of Routines
Example:
HANDLE Handle;
int retcode;
retcode = OC_SetHostWatchdog(Handle, WATCHDOG_IDLE, 10 );
/* Watchdog times out in 1 second and places scanner in idle
mode */
OC_SetInputUpdate
Mode OC_SetInputUpdateMode controls how the scanner updates inputs.
Syntax:
int OC_SetInputUpdateMode(HANDLE handle, int mode);
Parameters:
Description:
This function does not affect output image scanning.
Return Value:
Considerations:
Supported in the DOS API library and the Windows NT API library
Example:
HANDLE Handle;
int retcode;
retcode = OC_SetInputUpdateMode( Handle, INUPD_NEVER );
/* Must use OC_DemandInputScan() function to obtain new input
data */
Parameter: Description:
handle Must be a valid handle returned from OC_OpenScanner
mode If
mode
is:
INUPD_NEVER The scanner does not scan inputs unless
explicitly requested by the
C_DemandInputScan function.
INUPD_ALWAYS The scanner continuously updates inputs
on every scan.
By default, the input update mode is INUPD_ALWAYS. A change in
status of the input update mode takes effect at start of next scan.
Name: Value: Description:
SUCCESS 0 conditional scan was set successfully
ERR_OCACCESS 2 handle does not have access to scanner
ERR_OCINIT 5 scanner has not been initialized; see OC_InitScanner
ERR_OCPARAM 8 parameter contains invalid value