This is a video demoing a bit of control code and my initial experience with the RMCS-220x series of serial-controlled DC servo motors.
I'm using this motor for a project, and wrote some code to test its responsiveness and reliability.
900rpm high-torque DC Servo Motor with UART (RMCS-2207) robokits.co.in/shop/index.php?main_page=product_info&cPath=75&products_id=371
Terminal Shield for Arduino (from JayCar) jaycar.com.au/productView.asp?ID=XC4224
LCD Arduino Shield and Arduino clone (from DX) dx.com/p/arduino-uno-r3-arduino-lcd-1602-keypad-shield-v2-0-lcd1602-expansion-board-building-blocks-265735#.U4bE1PmSzTc
For more information see: tacticalspace.org/archives/dc-servo-motor-controller