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Advanced Topics

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and contains the commands and functions necessary to communicate with the

instrument. You can use the software module entry data to locate the component

on your system and determine what instrument models and class interfaces (called

Published APIs in the configuration server) are supported by the component.

HardwareAsset

describes a specific physical device in your

system with which you communicate such as an oscilloscope or power supply. The

HardwareAsset

includes a resource descriptor – a string that specifies the I/O

interface and address of a hardware asset, such as GPIB::23::INSTR.

DriverSession

provides the information needed to use a

driver in a particular context. It makes the association between a

SoftwareModule

and a

HardwareAsset

. It defines a set of properties for use

by IVI instrument driver software modules, such as initial configurable settings for

attributes, virtual name mappings, and simulation settings. You can configure a

DriverSession

for each instrument, for each of its possible I/O resource

descriptors, and for each program that uses it.

LogicalName

is a configurable pointer to a particular

DriverSession

. Application programs use logical names to avoid direct

references to software modules and hardware assets. In a typical setup, the

application communicates with an instrument via a logical name. If the application

needs to communicate with a different instrument (for example, the same kind of

scope at a different location), only the logical name within the IVI Configuration

Store needs to be updated to point to the new driver session. You don’t need to

rewrite any code in the application, because it uses the same logical name.

The illustration below shows how the IVI Configuration Store enables

interchangeability. The application is developed and makes calls via the logical

name. In the illustration, this is shown as DMM. The actual DMM is from

Vendor X at address GPIB1::21::INSTR and uses the Vendor X DMM IVI-COM

driver. In the Configuration Store, the logical name DMM is associated with a

Driver Session that is configured to the specific information of the Vendor X

DMM.

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HP Drive Bedienungsanleitung Seite 107