The FSI Encoder “User’s Manual” is the complete guide to Optical Incremental Rotary Shaft Encoders. The guide contains common output options, wiring information, mechanical drawings for the RSE, HDE and ESE series encoders, and common       encoder formulas. The section on encoder theory discusses operation, noise immunity,  output options, construction, interfacing, power requirements, mechanical limits,       electrical speed limits, environmental limits and maximum line resolution.