Rockwell Automation 1747-PCINT API Software for 1746 I/O - Manual (Page 96)

6–42 Library of Routines OC_GetUserJumper State
Publication 1747-6.5.3 June 1998
OC_GetUserJumper
State OC_GetUserJumperState reads the state of the user selectable jumper.
Syntax:
int OC_GetUserJumperState(HANDLE handle, BYTE *jmpr);
Parameters:
Description:
The scanner reads the state of the jumper once during its POST and does not continually monitor the state
of the jumper.
The scanner must be initialized before you can monitor the jumper position.
Return Value:
Considerations:
Supported in the DOS API library and the Windows NT API library
Example:
HANDLE Handle;
BYTE jmpr;
int retcode;
retcode = OC_GetUserJumperState( Handle, &jmpr );
Parameter: Description:
handle Must be a valid handle returned from OC_OpenScanner
jmpr
If jmpr is:
JUMPER_PRESENT jumper is installed
JUMPER_ABSENT jumper is not installed
Name: Value: Description:
SUCCESS 0 switch position was read successfully
ERR_OCACCESS 2
handle does not have access to scanner
ERR_OCINIT 5 scanner has not been initialized, see OC_InitScanner