DSBOX-NX2 (Rev. 1.1) Industrial Input Output Interface Tutorial

DSBOX-NX2 (Rev. 1.1) Industrial Input Output Interface Tutorial

Jetson Xavier NX

18 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-NX2 (Rev. 1.1)

OS: JetPack 4.5 (L4T-32.5)


This blog post is suitable for ;

• NVIDIA Jetson Xavier NX SOM with DSBOARD-NX2 (Rev. 1.1) 

• DSBOX-NX2 (Rev. 1.1)


In this blog post, we will test the IIO (Industrial Input Output) interface of DSBOX-NX2.



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 the isolated ground for IIO applications.


Digital IN0 Test




Find sysfs equivalent of the connected input pin from the table. For this setup it is gpio-232. After proper hardware connection, we can continue with the software side.

Set gpio232 (DIGITAL_IN0) as input and read sensor value. To do this, you should use the commands below.


• sudo echo 232 > /sys/class/gpio/export

• sudo echo in > /sys/class/gpio/gpio232/direction

• sudo cat /sys/class/gpio/gpio232/value


Digital OUT0 Test


Find sysfs equivalent of the connected output pin from the table below. For this setup it is gpio-236. After proper hardware connection with industrial LED, we can continue with the software side.



Then set gpio236 (DIGITAL_OUT0) as output and control light state. To do this, you should use the commands below.


• sudo echo 236 > /sys/class/gpio/export

• sudo echo out > /sys/class/gpio/gpio236/direction


To short Output

• sudo echo 1 > /sys/class/gpio/gpio236/value


To open Output

• sudo echo 0 > /sys/class/gpio/gpio236/value


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