analoginput (Data Acquisition Toolbox)

Data Acquisition Toolbox

Search Help Desk

analoginput

Examples See Also

Create an analog input object.

Syntax

AI = analoginput('adaptor')

AI = analoginput('adaptor', ID)

Arguments


`adaptor`	Name of the hardware driver adaptor
`ID`	Device identifier
`AI`	The analog input object

Description

analoginput creates an analog input object. This device object exists both in the data acquisition engine and the MATLAB workspace. When the object is created:

If referenced for the first time, the hardware device driver associated with adaptor is loaded and initialized.
There are no hardware channels associated with it.

analoginput accepts one or two input arguments depending on the hardware you are accessing. The input arguments are given below.


Description	Supported Vendors and Devices
	Sound Card	National Instruments	Hewlett-Packard
`adaptor`	`winsound`	`nidaq`	`hpvxi`
`ID`	N/A	Device number	Device ID

For National Instruments hardware, ID must be specified as a double. For Hewlett-Packard hardware, ID can be specified as a double or a string.

If the values supplied to analoginput are incomplete or incorrect, or the referenced driver is not found, then an error is returned. To use the analog input object to perform data acquisition tasks, hardware channels must be added with the addchannel function.

Example

Sound Card

To create an analog input object for a sound card

AI = analoginput('winsound')

National Instruments

To create an analog input object for a National Instruments device defined as device number 1

AI = analoginput('nidaq', 1)

Hewlett-Packard

To create an analog input object for a Hewlett-Packard (HP) VXI device with device ID 8 (slot 8)

AI = analoginput('hpvxi', 8)

The HP driver allows you to span multiple hardware. To span two HP VXI devices with device ID's 8 and 9

AI = analoginput('hpvxi', [8 9])