Xtium2-CXP PX8 User's Manual
Technical Specifications
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93
Note 3: RS-422/TTL Shaft Encoder Input Specifications
Dual Quadrature Shaft Encoder Inputs (phase A and phase B) connect to differential signals
(RS-422), single ended signals or TTL signals. The figure below shows the simplified representation
of these inputs.
WARNING
: When using shaft encoders, make sure to connect a common ground
between the shaft encoder and frame grabber.
See
RED
boxed connections in the diagram below.
Failure to follow the described instructions could damage the board resulting in the
shaft encoder not working properly.
Ensure that these grounding measures are followed when migrating from boards
with opto-coupled shaft encoders (such as the Xcelera).
Shaft Encoder
100
Ω
PhaseB-
100
Ω
PhaseA-
Phase B
Phase A
Xtium2-CXP PX8
GND
Frame Grabber /
System Ground
V+
V-
Figure 35: RS-422 Shaft Encoder Input Electrical Diagram
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The shaft encoder ground and the Xtium2-CXP PX8 computer system ground must be
connected together.
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RS-422 Input Specifications:
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Input signals must meet the following
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Maximum differential input voltage is +/- 7V.
•
Minimum differential voltage level is +/- 200mV.
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Both inputs have a 100-ohm differential resistor.