PC104 View Datasheet(PDF) - PMD
Part Name
Description
MFG CO.
'PC104' PDF : 70 Pages View PDF
Operation
2
If single-ended connections are used only the + signal is connected, and the - signal should be left floating. For
example, in connecting to the A quadrature input, QuadA1+ connects to the signal, and QuadA1- is left floating.
If differential connections are used, both the + and - signals are used. Differential or single-ended termination
must be selected through resistor pack installation. See table in section 1.6, Preparing the Card for Installation, page 11,
for details. Note that all Quadrature and index connections should be in either single-ended or differential mode. It
is not possible to mix on a signal-by-signal basis.
When using the system with differential connections, if desired, the polarity of the differential signal
can be reversed by swapping the + and - connections. This may be useful for altering the motor
and/or encoder direction, however this same function can also be accomplished through commands
to the motion processor. See Navigator Motion Processor User’s Guide, for more information.
Associated connections that are supported by the card are the +5V output signals. These are
provided as a convenience, as they are generally connected to a corresponding input on the encoder,
to power its LEDs or other circuitry. As was the case for the digital input signals, one or more of the
digital grounds must also be connected.
For a complete description of the pinout connections to/from the card, see section 5, Navigator-PC/104
Electrical Reference, page 55.
2.4.3 Analog Input
The Analog1-8 signals provide general purpose input of 8 analog signals. If connected, the voltages
present at these various connections do not directly affect the motion processor’s behavior. However
they can be read through the motion processor, and thus provide a convenient way of bringing in
analog signal levels that may be acted upon by the user’s application code located on the PC. These
signals are read using the Navigator command ReadAnalog. For more information on reading the
value of these analog inputs, see Navigator Motion Processor User’s Guide.
These signals are named Analog1-8
The minimum allowed input voltage is 0.0V, and the maximum allowed input voltage is 4.096V. To
determine the numerical value that will be read by the motion processor given a specific voltage, the
following formula is used:
ReadValue = AnalogVoltage * 65,472 / 4.096V
Conversely, given a read value, the voltage at the connection is calculated as:
AnalogVoltage = ReadValue * 4.096V / 65,472
Connections & associated signals
For analog voltages to be read correctly, in addition to the analog signal itself, AnalogGND (Analog
ground) must be connected.
Navigator-PC/104 User’s Guide
33
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