Data Acquisition Toolbox

digitalio

Create a digital I/O object

Syntax          

DIO = digitalio('adaptor',ID)

Arguments

'adaptor'	Name of the hardware driver adaptor. The supported adaptors are nidaq and cbi.
ID	The hardware device identifier.
DIO	The digital I/O object.

Description

DIO = digitalio('adaptor',ID) creates the digital I/O object DIO for the specified adaptor and for the hardware device with device identifier ID. ID can be specified as an integer or a string.

Remarks

More About Creating Digital I/O Objects

• When a digital I/O object is created, it does not contain any hardware lines. To execute the device object, hardware lines must be added with the addline function.
• You can create multiple digital I/O objects that are associated with a single digital I/O subsystem. However, you can typically execute only one of them at a time.
• The digital I/O object exists in the data acquisition engine and in the MATLAB workspace. If you create a copy of the device object, it references the original device object in the engine.
• The Name property is automatically assigned a descriptive name that is produced by concatenating adaptor, ID, and -DIO. You can change this name at any time.

More About the Hardware Device Identifier

When data acquisition devices are installed, they are assigned a unique number, which identifies the device in software. The device identifier is typically assigned automatically and can usually be manually changed using a vendor-supplied device configuration utility. National Instruments refers to this number as the device number.

There are two ways you can determine the ID for a particular device:

• Type daqhwinfo('adaptor').
• Execute the vendor-supplied device configuration utility.

Example

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

DIO = digitalio('nidaq',1);

See Also

Functions

addline, daqhwinfo

Properties

Name

delete

disp