Omega Engineering EN-EIC-325-PCI manual Introduction, Encoder Counters

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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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Contents User’s Guide Servicing North America Model Table of Contents Section Each Encoder Interface includes the following elements Encoder InterfaceCards Hardware I/O Software InputsPIN LAY-OUT Encoder InputsEncoders Event Signals and General Outputs Logical InputsFunction Type Pin No CPP InstallationVB folders Page WinSysPath folder WinSysPath is Page Page Introduction to the Functions Chip Level Functions Card Level FunctionsGetActiveChip Brief Name Arguments in C Syntax Full DescriptionSetActiveChip All the following functions refer to that active chipInputs Brief Description NameShort EncoderNumber BriefArguments in C Syntax Full Description Short EncoderNumber Short ClocksPerCycleCounter SetIndexPulsePolarityShort Polarity GetIndexPulsePolarityGetSetPoint SetSetPointLong SetPoint SetPointPolarity SetEncoderEventFlagSource GetEncoderEventFlagClearEncoderEvent SetHoldEncoderEventFlag GetHoldEncoderEvent Long* PositionCounter ResetPositionCounter Short OutputsMirror ReadPositionCounterAvailable only for RequestPositionCounter Polarity Encoder Counters IntroductionGeneral Input Signals from the EncodersSquare wave signal Sine wave signalGeneral SoftwareConnector Wiring for the Inputs Connector Wiring for the Outputs Yes NextFinish WinNTPage Page Page Page Page Page Page Appendix D Product Development WARRANTY/DISCLAIMER Shop online at omega.com
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