Debug Console UART

The debug UART is located on the internal debug connectors on the carrier board.  The Linux debug console is available on UART3.  Typically a USB to 3.3V TTL UART cable is used for this interface.  This connector is compatible with Raspberry Pi UART cables.

• UART1 – RS-485 interface on Rear Terminal Blocks
• UART3 – RS-232 3.3V TTL interface
  • Standard Linux Debug Console
  • J13 3-pin 0.1” header connector
• UART4 – RS-232 3.3V TTL interface
  • Co-Processor Debug Console
  • J12 3-pin 0.1” header connector

Figure 3 – UART Debug Connector Pinout

Figure 4 - Connecting the USB to RS-232 TTL Serial Debug Cable

Console Serial Port Parameters

• port: it depends on your hardware, often it is /dev/ttyUSBx on Linux, or COMx on Windows, being x a number to be determined in the next section.
• Baud Rate: 115200
• Parity: none
• Bits: 8
• Stopbits: 1
• Flow control: none

Windows - Find the Number of the COM Port

Go to Control Panel and find the Device Manager. Your COMx port will be listed under Ports.

Linux - Find the Number of the ttyUSB Port

Unplug the device from your computer and run:

$ ls /dev/ttyUSB*

Plug the device and run the same command again, your device will be listed:

$ ls /dev/ttyUSB*