FSI Technologies has shed some light on the problem! The “Indicoder” option is available exclusively on all FSI cube type encoders (ESE, RSE, HDE, etc*). With this option, LEDs are located directly on the body of the encoder that flash as the shaft is turned to instantly verify correct output operation. This indicator will make set-up quick and easy and would also aid in troubleshooting (if that ever becomes necessary). Just ask for the “Indicoder” option when ordering your FSI cube encoder. (*formerly known as Fork Standards encoders)