DSBOX-N2 Industrial Input Output Interface Tutorial | Forecr.io

DSBOX-N2 Industrial Input Output Interface Tutorial

Jetson Nano

26 May 2021
WHAT YOU WILL LEARN?

1- The pinout of I/O connector  

2- Example of an input application 

3- Example of an output application 

ENVIRONMENT

Hardware: DSBOX-N2

OS: Jetpack 4.5(L4T-32.5)


This blog post is suitable for:

• NVIDIA Jetson Nano SOM with DSBOARD-NX2 Carrier Board

• DSBOX-N2

In this blog post, we will test the IIO(Industrial Input Output) interface of DSBOX-N2.



First, let's look over the IO connector. On the connector, there are 3 isolated outputs, 2 isolated inputs and 1 isolated ground. When using IIO, always double check which ground pin you are using. You must use isolated ground for IIO applications.



Digital IN0 Test


Digital input side accepts signals between 12-24V (rated for 2.25mA). In our application, we used Heschen M12 Inductive Proximity Sensor (PNP & Normally Open(NO)) with 24V voltage source.



Find sysfs equivalent of the connected input pin from the table. For this setup it is gpio-504. After proper hardware connection, we can continue on the software side.

Set gpio504 (DIGITAL_IN0) as input and read sensor value. To do this, you could use the commands below.



sudo echo 504 > /sys/class/gpio/export
sudo echo in > /sys/class/gpio/gpio504/direction
sudo cat /sys/class/gpio/gpio504/value



Digital OUT0 Test


Digital output side can drive loads up to 24V and has a current limit of 1A. They work as low side switches, open-close between them and GND_ISO. So, you should have a circuitry as in the schematic below. In our application, we used GASHER 24V Indicator Light with 24V voltage source. 



Find sysfs equivalent of the connected output pin from the table below. For this setup it is gpio-508. After proper hardware connection with industrial LED, we can continue on the software side.

Then set gpio508 (DIGITAL_OUT0) as output and control light state. To do this, you could use the commands below.



sudo echo 508 > /sys/class/gpio/export
sudo echo out > /sys/class/gpio/gpio508/direction

To short Output:


sudo echo 1 > /sys/class/gpio/gpio508/value

To open Output:



sudo echo 0 > /sys/class/gpio/gpio508/value

Thank you for reading our blog post.