The DPI (Debug Port Interface) is a USB-to-Serial-TTL converter at 3.3V that allows you to connect a FOX Board G20, Terra G25 or Arietta G25 Embedded Linux board to a PC's USB port so that you can have access to the system messages generated by the board's Linux console.
The DPI board uses an FTDI chip to create a virtual COM port on your PC.
The picture below shows how the DPI plugs onto the Debug Port of a Terra G25 and FOX Board G20:
The five through-hole pads provided are compatible with 4D Systems displays. You could solder headers and use the DPI as a 4D programming interface (just keep in mind that doing so would void your 4D warranty, as the DPI is not made by 4D).
Using DPI in Windows You can use the free PuTTY application that can emulate a serial terminal or manage an SSH session. Download the putty.exe from the PuTTY Download Page then run it.
You will see a Configuration dialog. Set Connection type to Serial. In the Serial line box enter the virtual COM port being used by the FTDI driver for the DPI (e.g. COM3, though the number will vary from system to system; use Device Manager to determine the correct number). In the Speed box enter 115200. Save that configuration then click Open.
You will receive a login prompt from your board. Use login root. The default password is netusg20 on the FOX G20, ariag25 on the Terra/Aria G25, and acmesystems on the Arietta G25.
Using DPI in Linux Use a terminal emulator such as minicom (on Ubuntu distribution you can install it using Synaptic or apt-get install minicom) and set the serial port to 115200 8N1 with no flow control (in minicom, after setup, select Save setup as dfl). Use the same login and password as shown above in the Windows instructions.
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