niRFSA_SetAttributeViInt32

ViStatus = niRFSA_SetAttributeViInt32 (ViSession vi, ViConstString channelName, ViAttr attributeId, ViInt32 value);

Purpose

Sets the value of a ViInt32 attribute.

You can use this low-level function to set the values of inherent IVI attributes, class-defined attributes, and instrument-specific attributes. If the attribute represents an instrument state, this function performs instrument I/O in the following cases:

• State caching is disabled for the entire session or for the particular attribute.
• State caching is enabled, and the currently cached value is invalid or is different than the value you specify.

NI-RFSA contains high-level functions that set most of the instrument attributes. It is best to use the high-level driver functions as much as possible. They handle order dependencies and multithread locking for you. In addition, they perform status checking only after setting all of the attributes. In contrast, when you set multiple attributes using the SetAttribute functions, the functions check the instrument status after each call.

Also, when state caching is enabled, the high-level functions that configure multiple attributes perform instrument I/O only for the attributes whose value you change. Thus, you can safely call the high-level functions without the penalty of redundant instrument I/O.

Parameters

Input
Name	Type	Description
vi	ViSession	Identifies your instrument session. vi is obtained from the niRFSA_init or the niRFSA_initWithOptions functions and identifies a particular instrument session.
channelName	ViConstString	If the attribute is channel based, this parameter specifies the channel to which the attribute applies. If the attribute is not channel based, set this parameter to "" (empty string) or VI_NULL.
attributeID	ViAttr	Pass the ID of an attribute.
attributeValue	ViInt32	Pass the value to which you want to set the attribute. Note  Some of the values might not be valid depending on the current settings of the instrument session.

Return Value