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APPENDIX A: SPECIFICATION
Introduction
A half-size PC card.
Supports four optical encoders with either Square-wave or Sine output, both linear
and rotary types.
Directly connected to the encoders and also provides the excitation.
Single / Multiple encoder pulses: Interpolation = 1, 2 or 4 (software selectable).
Independent operation mode for each axis.
General inputs, an index input per each encoder, and an input to request a snapshot
of all counters in real-time.
The user may instruct the card to generate an "Event Signal" output upon reaching a
pre-defined set-point, counter overflow, or index (marker) signal.
General outputs, an "Event Signal" output per each encoder, and a "Voltage Failure"
indicator.
All outputs are opto-isolated.
Max. input pulse rate: 500 kpps.
Software included:
Drivers for Win95/98/NT/2K/XP and how to communicate under DOS.
Useful utility that allows immediate read/test of the encoders.
Detailed example in VB and basic example in Visual C.
Encoder Counters
24 bit up/down latch counter for each axis. Counter's range is from 0 to 16777215. In
case the user needs also negative values, he may consider the range 0 – 16777215 as
-8388608 – +8388607.
Each counter has a corresponding programmable set-point value.
The user may instruct the card to generate an "Event Signal" output when card's counter
reaches its corresponding set-point value, or at counter overflow.
User may request a snapshot of a counter without stopping the counting process, thus
not losing data. The operation may be accomplished either by software or, in real-time,
by a hardware input.
A counter may be reset by encoder's index output and/or by request via user's software.
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