80 • Technical Specifications X64 Xcelera-HS PX8 User's ManualJ11: RS-422 Shaft Encoder InputJ11 provides an alternative method to connect shaft encoder signals to the Xcelera-HS PX8 board,providing a higher maximum input signal frequency, but without the signal isolation provided bythe opto-coupled shaft encoder inputs (on J1 or J4). The user or imaging application enables, viaboard parameters, which shaft encoder inputs are used for acquisition timing. For more informationsee "Shaft Encoder Interface & Timing" on page 44.J11 Pin Header Numbering Detail2 4 6 8 101 3 5 7 9J11 Signal DescriptionsDescription Pin # Pin # DescriptionGround 1 2 GroundShaft Encoder Phase A + 3 4 Shaft Encoder Phase A -Ground 5 6 GroundShaft Encoder Phase B + 7 8 Shaft Encoder Phase B -Ground 9 10 GroundTable 36: J11-Connector DetailsSE +SE -SE to FPGADS9637ACM100100100Figure 39: RS-422 Shaft Encoder Input Electrical Diagram• For single ended TTL signals, connect a bias voltage to the RS-422 (-) input to ensure correctdetection of the logic state of the TTL signal connected to the RS-422 (+) input. See thefollowing section for connection methods.• Maximum input voltage is 7V.• All inputs have a 100-ohm series resistor.• Maximum input signal frequency is 5 MHz.• Propagation Delay Time Low to High = 15ns Typical, 25ns Max.• Propagation Delay Time High to Low = 13ns Typical, 25ns Max.• See "Shaft Encoder Interface & Timing" on page 44 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_SOURCECORACQ_PRM_EXT_SHAFT_ENCODER_SOURCE• See also *.cvi file entries:Shaft Encoder Enable, Shaft Encoder Pulse Drop, Shaft Encoder Sourceor see External Line Trigger Enable, External Line Trigger Detection, External Line Trigger Level,External Line Trigger Source.
