Rockwell Automation 1747-PCINT API Software for 1746 I/O - Manual (Page 128)

6–74 Library of Routines OC_SetUserLEDState
Publication 1747-6.5.3 June 1998
OC_SetUserLEDState OC_SetUserLEDState sets the state of a user-defined LED
Syntax:
int OC_SetUserLEDState(HANDLE handle, int lednum, int state);
Parameters:
Description:
The application can use the four user LEDs for any purpose.
Return Value:
Considerations:
Supported in the DOS API library and the Windows NT API library.
Example:
HANDLE Handle;
int retcode;
retcode = OC_SetUserLEDState( Handle, 1, LED_GREEN_SOLID );
Parameter: Description:
handle Must be a valid handle returned from OC_OpenScanner
lednum
Must be a value from 1 to 4, which corresponds to LED1, LED2, LED3, and
LED4
ledstate
If ledstate is:
LED_OFF LED is off
LED_RED_SOLID LED is on, red solid
LED_GREEN_SOLID LED is on, green solid
LED_RED_FLASH LED is on, red flashing (LED1 and LED2
only)
LED_GREEN_FLASH
LED is on, green flashing (LED1 and LED2
only)
Name: Value: Description:
SUCCESS 0 LED was updated successfully
ERR_OCACCESS
2
handle does not have access to scanner
ERR_OCPARAM 8 parameter contains invalid value