{"id":990,"date":"2025-08-14T06:59:01","date_gmt":"2025-08-14T06:59:01","guid":{"rendered":"https:\/\/blog.aetherix.com\/?p=990"},"modified":"2026-03-27T13:46:15","modified_gmt":"2026-03-27T13:46:15","slug":"uart-ttl-debug-guide-for-nvidia-jetson","status":"publish","type":"post","link":"https:\/\/blog.openzeka.com\/en\/uart-ttl-debug-guide-for-nvidia-jetson\/","title":{"rendered":"UART\u2013TTL Debug Guide for NVIDIA Jetson"},"content":{"rendered":"

UART (Universal Asynchronous Receiver\/Transmitter) is a widely used communication method that allows electronic devices to talk to each other by sending data one bit at a time. Developers often use UART to help debug their systems. By connecting a UART module to their device, they can send messages from the device to an external terminal or debugger. This makes it easier to watch what’s happening inside the system in real time \u2014 such as checking variables or seeing how the program is running. Because UART works asynchronously, it doesn\u2019t need a shared clock signal between devices, which makes it relatively simple to use for debugging tasks.<\/p>\n

Required Materials:<\/strong><\/p>\n

    \n
  • NVIDIA Jetson Kits<\/li>\n
  • Jumper Cables<\/li>\n
  • FTDI or USB TTL Converter<\/li>\n
  • Native Ubuntu host computer<\/li>\n<\/ul>\n<\/div>

    Connection<\/h2><\/div>

    Identify the RXD, TXD, and GND pins on your FTDI or USB-TTL converter. You will use jumper wires to connect this module to your Jetson device. However, one important thing to note: the connections must be crossed. This means the TX pin from Jetson goes to the RX pin on the converter, and vice versa. You can follow the table below to correctly connect Jetson\u2019s UART pins to the converter\u2019s pins.<\/p>\n<\/div>\n

    \n\n\n\n\n\n\n\n
    Jetson<\/th>\nFTDI<\/th>\n<\/tr>\n<\/thead>\n
    RXD<\/td>\nTXD<\/td>\n<\/tr>\n
    TXD<\/td>\nRXD<\/td>\n<\/tr>\n
    GND<\/td>\nGND<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Next, connect the USB end of the converter to your computer<\/strong>. While making these connections, do not power on the Jetson<\/strong> yet. You will connect the power supply in Step 8<\/strong>.<\/p>\n<\/div>

    <\/span><\/div>

    Setup<\/h2><\/div>

    1.<\/strong> To perform debugging, we need an application called Minicom. You can install it by entering the following command in your computer\u2019s terminal:<\/p>\n<\/div>