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Serial cable FTDI USB, to connect to UART0 Serial port on the SB.
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This serial cable allows you to connect to the UART0 Serial port on the Smoothieboard.
Labelled "Serial", near the USB connector, this port allows you to read important debugging information when developping for the Smoothieware firmware, but also provides all the functionality the USB Serial port provides, and allows you to send G-code and commands to the board.
You can also use this cable to debug Smoothie using GDB, the same way you would do with a much more expensive JTAG cable, see http://smoothieware.org/mri-debugging
Please be cautious with the direction of the connector as it is not polarized ( the black wire is "GND" on the board ).