The ARS-USB product include 3 manuals
The ARS-USB is accesible via a serial/COM Port once it’s plugged to the computer. By means of a Terminal (i.e. HyperTerminal, TeraTerm, Putty, etc) you can send commands via that serial Port so you will need a list of all commands supported. For the appointing and rotor control, it supports the same Yaesu GS232A commands, This is the guide of all ARS-USB commands supported.
ARS Manual - Obsolete model RCI-SE via Parallel Port (2002-2011)
The RCI-SE Board was sold from 2002 till 2011.
ARS Manual - Obsolete RCI Model via Parallel Port (1996-2002)
This model of RCI PCB was the first available with the ARS. It was operational from 1996 to mid-2002 and replaced by the RCI-SE model