Rockwell-automation 1747-PCINT API Software for 1746 I/O Uživatelský manuál stáhnout pdf (Strana 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

switch position was read successfully

ERR_OCACCESS

handle does not have access to scanner

ERR_OCINIT

scanner has not been initialized, see OC_InitScanner

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Uživatelský manuál Strana 96