[PDF] Installation and Wiring Guide - Encoder Products Company direction. As the encoder shaft rotates, output signals are produced, proportional to the distance (angle) of rotation. The signal may be in the form of a square wave (for an incremental encoder) or an absolute measure of position (for an absolute encoder). Due to the performance and reliability advantages of the semi-conductor technology they Aerosonic Encoding Altimeter Pin out? - VAF Forums Mar 13, 2010Aerosonic Encoding Altimeter Pin out? I need to find the pin out wiring for an Aerosonic "digitizer" altimeter. The model is 101435. Digging the web I've found that almost all models of Aerosonic altimeters use the same test harness.. so I think my model number may not be too critical.