Direction (Data Acquisition Toolbox)

Specify whether a line is used for input or output

Description

When adding hardware lines to a digital I/O object with addline, you must configure the line direction. The line direction can be In or Out, and is automatically stored in Direction. If a line direction is In, you can only read a value from that line. If a line direction is Out, you can write or read a line value.

For line-configurable devices, you can change individual line directions using Direction. For port-configurable devices, you cannot change individual line directions.

Characteristics

Usage
DIO, Line

Access
Read/write

Data type
String

Read-only when running
Yes

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

Values

{In}
The line can be read from.

Out
The line can be read from or written to.

`{In}`	The line can be read from.
`Out`	The line can be read from or written to.

Example

Create the digital I/O object dio and add two input lines and two output lines to it.

dio = digitalio('nidaq',1);
addline(dio,0:3,{'In','In','Out','Out'});

To configure all lines for output:

```
dio.Line(1:2).Direction = 'Out';
```

See Also

Functions

addline

DefaultChannelValue EventLog