I got this to work without serial ports and without any major difficulty using the FTDI TTL to USB serial converter (http://www.sparkfun.com/commerce/product_info.php?products_id=9717). I’m actually using a 3v one I had bough for Xbee use. It was really easy. Orange wire is Tx, Yellow is Rx. Connect them for loopback. I used minicom since I’m on linux. I had to minicom -s at first, set the serial device to /dev/ttyUSB0. The loopback didn’t work until I disabled hardware flow control.
Tutorial - Beginning Embedded Electronics - 4 | about 2 years ago
I got this to work without serial ports and without any major difficulty using the FTDI TTL to USB serial converter (http://www.sparkfun.com/commerce/product_info.php?products_id=9717). I’m actually using a 3v one I had bough for Xbee use. It was really easy. Orange wire is Tx, Yellow is Rx. Connect them for loopback. I used minicom since I’m on linux. I had to minicom -s at first, set the serial device to /dev/ttyUSB0. The loopback didn’t work until I disabled hardware flow control.