this command works like scanning.
SDA - set data scanning. this will declare that you will use scanning mode
STA - Start point. Point where you start scanning
DIR - direction point. Point with shows with direction points will be taken.
But where to get additional information about that kind of parameters, i cant help you. Maybe something sayed about them in manuals but i'm not sure i have only "Quindos Basic Documentations Part 1 and 2"