The LCI-90i can interface to all industry standard rotational sensors. The three main types we have interfaced to have been encoders, proximity sensors and hall effect sensors. Encoders yield high resolution information but have mounting issues. Proximity sensors require metal targets and are good for retrofits but yield low pulse rates and usually require two sensors to generate the proper waveform. Hall effects require magnetic targets excellent for retrofits, are a single barrel solution and can yield considerable pulse rates. The LCI-90i can include pull-ups or pull-down resistors for NPN or PNP sensors respectively (through the front panel menu structure).