digitalio (Data Acquisition Toolbox)

Create a digital I/O object.

Syntax

DIO = digitalio('adaptor', ID);

Arguments


`adaptor`	Name of the hardware driver adaptor
`ID`	Device identifier
`DIO`	The digital I/O object

Description

digitalio creates a digital I/O 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 lines associated with it.

digitalio accepts two input arguments. The input arguments are given below.


Description	Supported Vendors and Devices
	National Instruments	Hewlett-Packard
`adaptor`	`nidaq`	`hpvxi`
`ID`	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 digitalio are incomplete or incorrect, or the referenced driver is not found, then an error is returned. To use the digital I/O object to perform data acquisition tasks, lines must be added with the addline function.

Example

National Instruments

To create a digital I/O object for a National Instruments device defined as device number 1

DIO = digitalio('nidaq', 1);

Hewlett-Packard

To create a digital I/O object for a Hewlett-Packard (HP) VXI device with device ID 8 (slot 8)

DIO = digitalio('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 = digitalio('hpvxi', [8 9]);