Data Acquisition Toolbox

HwLine

Specify the hardware line ID

Description

All lines contained by a digital I/O object have a hardware ID and an associated MATLAB index. The hardware ID is given by HwLine and the MATLAB index is given by the Index property. The HwLine value is defined when hardware lines are added to a digital I/O object with the addline function.

The beginning line ID value depends on the hardware device. For National Instruments hardware, line IDs are zero-based (begin at zero).

Characteristics

Usage	DIO, Line
Access	Read/write
Data type	Double
Read-only when running	Yes

Values

Values are automatically defined when lines are added to the digital I/O object with the addline function. The default value is one.

Example

Suppose you create the digital I/O object dio and add four hardware lines to it.

• dio = digitalio('nidaq',1);
  addline(dio,0:3,'out');
  

addline automatically assigns the indices 1-4 to these hardware lines. You can swap the hardware lines associated with index 1 and index 2 with HwLine.

• dio.Line(1).HwLine = 1;
  dio.Line(2).HwLine = 0;
  

See Also

Functions

addline

Properties

Line, Index

HwChannel

Index