74 • Technical Specifications Xtium-CL PX4 User's ManualNote 3: RS-422 Shaft Encoder Input SpecificationsDual Quadrature Shaft Encoder Inputs (phase A and phase B) connect to differential signals (RS-422) or single ended signals. The figure below shows the simplified representation of these inputs.From UserInterfaceConnector100Ω PhaseB+PhaseB-100Ω PhaseA+PhaseA-Phase BPhase AFigure 27: RS-422 Shaft Encoder Input Electrical Diagram• RS-422 differential line receiver used is am26lv32.• Input signals must meet the following• Maximum differential input voltage is +/- 7V.• Minimum differential voltage level is +/- 200mV.• Both inputs have a 100-ohm differential resistor.• Maximum input signal frequency is 10 MHz.• The Xtium-CL provides ESD filtering on-board.• See "Line Trigger Source Selection for Line scan Applications" on page 39 for more information.• Refer to Sapera parameters:CORACQ_PRM_SHAFT_ENCODER_ENABLE CORACQ_PRM_SHAFT_ENCODER_DROPor refer to CORACQ_PRM_EXT_LINE_TRIGGER_ENABLECORACQ_PRM_EXT_LINE_TRIGGER_DETECTIONCORACQ_PRM_EXT_LINE_TRIGGER_LEVEL (fixed at RS-422)CORACQ_PRM_EXT_LINE_TRIGGER_SOURCE• See also *.cvi file entries:Shaft Encoder Enable, Shaft Encoder Pulse Drop,or see External Line Trigger Enable, External Line Trigger Detection, External Line Trigger Level,External Line Trigger Source.• For TTL single ended signals, connect a bias voltage to the RS-422 (-) input to ensure correctdetection of the logic state of the signal connected to the RS-422 (+) input. See the followingsection for connection methods.
