From 6:00 PM CST Friday, Feb 15th - 2:00 AM CST Sunday, Feb 17th, ni.com will be undergoing system upgrades that may result in temporary service interruption.

We appreciate your patience as we improve our online experience.

Table Of Contents

Connecting Digital I/O Signals

Last Modified: November 16, 2017

The number of digital lines varies from device to device. The following figure shows signal connections for three typical DIO applications.

The figure shows PO <0..3> configured for digital input and PO <4..7> configured for digital output. Digital input applications include receiving TTL signals and sensing external device states such as the state of a switch. Digital output applications include sending TTL signals and driving external devices such as the LED shown in the figure.


Recently Viewed Topics