74
•
Technical Specifications
Xtium-CL PX4 User's Manual
Note 3: RS-422 Shaft Encoder Input Specifications
Dual 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 User
Interface
Connector
100
Ω
PhaseB-
100
Ω
PhaseA-
Phase B
Phase A
Figure 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_DROP
or refer to CORACQ_PRM_EXT_LINE_TRIGGER_ENABLE
CORACQ_PRM_EXT_LINE_TRIGGER_DETECTION
CORACQ_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 correct
detection of the logic state of the signal connected to the RS-422 (+) input. See the following
section for connection methods.
