This routine is only applicable for points with an update criteria of either On Demand On Change or On Demand On Scan. This routine is called whenever the demand status for one of these points is changed. This lets you perform device specific actions for the specified point when its demand status changes.
You can find the template for this subroutine in:
usrtm_dmdres.c
Syntax
void user_on_demand_response (address_struct, ptState,
status)
ADDR_DATA *address_struct;
int ptState
int *status
Input Parameters
address_struct
Is a pointer to the address from which the data was read. ADDR_DATA is a typedef to a structure defined in <inc_path/toolkit.h>.
ptState
Contains the new Demand State of the point.
A value of TRUE indicates that the
point is going into demand.
A value of FALSE indicates that
the point is no longer in demand.
Output Parameters
status
Indicates whether the function successfully obtained all of the requested information. Valid values are:
|
TOOLKIT_SUCCESS |
Function completed successfully. |
|
TOOLKIT_FAILURE |
Function did not complete successfully. |
Return Value
None.
|
|
Device Communications toolkit subroutines. |
