PC104 View Datasheet(PDF) - PMD
Part Name
Description
MFG CO.
'PC104' PDF : 70 Pages View PDF
2
Operation
2.4 Signal Processing and Hardware Functions
Signal processing and hardware functions are card functions which are not directly user-programmable.
These are card characteristics which are encoded in hardware. Primarily this consists of various types of
signals. The following sections lists these related groups of signals and provides information that may be
helpful when connecting your motion system.
2.4.1 Home, AxisIn, AxisOut, Limits, Hall Sensors
These signals are conditioned by the card, but are output or input directly to the motion processor. The
Navigator Motion Processor User’s Guide explains the functions provided in connection with these various
signals. Most of the signals are optional, and are connected depending on the nature of the application
being used.
These signals are named Home1-4, AxisIn1-4, AxisOut1-4, PosLim1-4 (positive direction limit input),
NegLim1-4 (negative direction limit input), and Hall1A-4C (12 signals in all).
Connections & associated signals.
This group of signals are direct single-signal digital inputs to the card, with the exception of AxisOut
which is a single-ended output. There are no associated connections that need to be made for these
signals to function properly, however one or more of the digital grounds must be connected. The
default value, upon powerup, for all AxisOut signals, is high.
For a complete description of the pinout connections to/from the card, see section 5, Navigator-PC/104
Electrical Reference, page 55.
2.4.2 QuadA, QuadB, Index
Quad A, B, Index
This group of signals provides position feedback to the controller which is used to track motor
position, and for servo motors, to generate a motor command. For DC brush and brushless DC
motors, they are required for proper operation. For microstepping or pulse and direction motors,
they are optional.
The encoder-processing circuitry provides a multi-pass digital filter of the QuadA, QuadB, and Index
signals for each axis. This provides additional protection against erroneous noise spikes, thereby
improving reliability and motion integrity.
These signals are named quadA1+ through quadB4- (16 signals), and Index 1+ through Index4- (8 signals).
Connections & associated signals
This group of signals are connected in one of two ways. Single-ended termination means that only
one wire per signal is used, while differential (dual) mode means two wires encode each signal
(labeled + and -). Differential encoding is generally recommended for the highest level of reliability
because it provides greater noise immunity than a single-ended connection scheme.
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Navigator-PC/104 User’s Guide
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