BeagleBone Black USB Expansion RS232 Module Cape - Coolgear
USB-2COM-BB | TITAN Electronics Inc.
Amazon.com: Waveshare Beaglebone Black Rev C Development Board Kit 512MB DDR3 4GB 1GHz ARM Cortex-A8 Board Expansion Cape Compatible with UNO and Leonardo : Electronics
BeagleBone Black USB Expansion RS232 Module Cape - Coolgear