Configuring Jetson Nano as slave in MODBUS

Hello, we are trying to configure on Jetson Nano as slave in MODBUS, but we is not working.

We already run this models

https://www.mathworks.com/help/supportpkg/nvidia/ug/jetson-modbus-tcpip-master-slave-communication.html

Client version ok . Server version is not ok

After this, we tried another way, but the target is Raspberry Pi.4, in this test, both, client model and server model ran well

https://www.mathworks.com/help/supportpkg/raspberrypi/ref/modbus-tcpip-communication-between-master-slave-using-raspberry-pi.html

We noticed that the libmodbus-dev version, using Raspberry Pi 4, the OS from MathWorks (https://github.com/mathworks/Raspbian_OS_Setup) is already installed and is version 3.1.4.

In NVIDIA case, when we intalled throught apt-get, the lib is version 3.0.6. until this moment is the only difference that we could find.

By the other side, we didnt find any documentation in NVDIA Support Package about need to install the libmodbus-dev.

[Ramakrishna Mandalapu]

Hi Erika,

This might be due to the mismatched Modbus library installation on the Jetson.

Can you please install the Modbus library from below repository?

https://github.com/stephane/libmodbus

Follow the below steps to install

git clone https://github.com/stephane/libmodbus
cd libmodbus
./autogen.sh
./configure && sudo make install

Note: You need to uninstall the previously installed library using below command.

sudo apt autoremove libmodbus-dev

Let us know if you have any other questions.

Thanks,

Ramakrishna

[Rodrigo Botelho]

Hi, Ramakrishna,

Just sharing our experience. On one of the Jetson Nanos, we had to also run ldconfig after installing the libmodbus-dev from source. Otherwise, it wouldn't find the libmodbus.so.5.

rcbb

Answer 1

[Ramakrishna Mandalapu]

Above installation steps resolved the issue at the user.