Featuring absolute track with serial code structure and incremental track that is scanned by single field scanning, Series ROC 2000 and ROC 7000 eliminate need for homing routine at power-up. Separate rotor coupling is used for coupling shaft making it possible to realize axial tolerances of up to ±1 mm depending on rotor coupling used. Rotor couplings are capable of compensating for axial motion and misalignment between encoder shaft and measured shaft.