PCI-QUAD-8 Eight and Four Channel Up/Down Counter Quadrature Input PCI Cards


  • Eight or Four-counter quadrature decoder
  • Single-ended or differential inputs for up to eight encoders (A, B & Index)
  • Programmable clock source (high/low) for digital filtering on inputs
  • Programmable active index polarity
  • Per counter software control corrects reversed A / B wiring and selects flag for interrupt source
  • Resettable fused 5V output available to power encoders or general purpose
  • High-density DB78 male I/O connector with screw locks


  • Extended temperature operation (-40° to +85°C)
  • RoHS compliant version
  • Support for Wind River VxWorks (call for ordering information)
Last updated on November 2, 2023, 6:25 pm


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Eight and Four Up/Down Counter Quadrature Input PCI Cards

The PCI-QUAD-8 provides quadrature counting on a convenient half-length PCI card. Up to eight differential encoders (each with A, B, and Index) can be monitored simultaneously.

Type AM26LS232 differential input circuits provide compatibility with a wide variety of quadrature encoder outputs.

The LSI/CSI LS7766 features:

  • 32-bit quadrature counters support x1, x2, and x4 counting modes, or can be used as non-quadrature up/down counters
    • Quadrature frequencies up to 9.6MHz
    • Non-quadrature frequencies up to 40MHz
  • Programmable index and marker flags (carry, borrow, sign & compare)
    • Enable/disable sources generating IRQ’s
  • Programmable count modes:
    • Normal (free-run) / Modulo-N / Range Limit / Non-Recycle, Binary / BCD


Please contact ACCES with your precise requirement. Examples of special orders would be conformal coating, two- or six-counter inputs, custom software, product labeling, and more. We will work with you to provide exactly what is required.


  • Industrial Automation
  • Automatic Test Systems
  • Laboratory Automation
  • Robotics
  • Machine Control
  • Security Systems
  • Energy Management
  • Oil and Gas Processing
  • Steel Processing
  • Metal Stamping
  • Motor and Drive Control
  • Embedded OEM

The card is 6.6 inches in length and 4.2 inches seated height. I/O wiring connections for this board are via a male 37-pin D-sub connector. A ribbon cable can be used to connect this card to termination panels.


A molded 6 ft DB78F to DB37F x 2 shielded “Y” cable, and a DIN-Rail mountable screw terminal kit that includes the “Y” cable is available.


Data Sheets



Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Information about our Free Software packages:

ACCES is proud to provide a full suite of software support with every Data Acquisition product. We are committed to supporting the most popular operating systems and platforms for our customers. Currently we are actively supporting XP -> 10, both 32 & 64 bit, including “Server 2008,” “Embedded,” and “Compact” flavors for all plug-and-play products including PCI, PCI Express, USB, and more. Many products continue to ship with support for additional operating systems such as DOS, Windows 95, 98, Me, NT4, and 2000.


Among the software we deliver with our products are sample programs in a wide variety of programming languages. These samples are used to demonstrate the software interfaces to our products — and many can be used as-is in your production environments, or to test functionality of the devices out-of-the-box. We’re currently actively supporting sample programs in Microsoft Visual C#, Visual Basic, Delphi, and Visual C/C++, with many devices including samples in Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.


Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.

Setup Programs and Utilites

Our Data Acquisition devices also include a graphical setup utility that walks you through the process of configuring any option jumpers or switches on the device, as well as explaining a little about the various connectors present.

Many devices also include utility programs – little tools to make your use of the device easier, such as EWriter, a program that allows you to read and write data in the user-accessible EEPROM locations on all our USB data acquisitition products; or WinRISC, a “Really Incredibly Simple Communications” terminal program that lets you get started instantly with serial devices.

“Register Level” Documentation

Besides all this software in all these languages and operating systems ACCES has a policy of open and transparent development: none of our lowest-level “register” interfaces are hidden from you — we document every register in every bus card, every command in every serial board, and every usb control transfer in every USB Data Acquisition board. These lowest-level interfaces allow you to develop for our products in ANY operating system or language, regardless of our actively supporting it or having a driver for it. We have customers actively developing in ADA, Android, Python, Java, MATLAB, Solaris, and more, just by referring to our complete low-level interface documentation! And we provide the full source code to all of our drivers, regardless of operating system, to give you an even bigger head start in your own development tasks.

No Fees or Royalties

All of this software is provided at no additional charge, and is licensed under any of a variety of flexible — and royalty free — options. Check out our software license explanation if you’d like more information.

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.


ACCES has successfully partnered with Wind River to bring our entire line of PCI and PCI Express DAQ cards to VxWorks 7!

VxWorks 7 VxBus Gen 2 drivers, with easy-to-use API-libraries, are available for this product, including full source and sample code.

Designed to be compatible with our AIOWDM.dll Windows driver & API, this kernel module adds zero% CPU-cycle overhead to your VxWorks runtimes while allowing the lowest-latency hardware register access possible.

You can find more information about our VxWorks libraries and services on our Wind River Silver Partner page.

Input Section

  • Receiver Type: AM26LS32
  • Configuration: Phase A, B and Index; differential or single-ended inputs
  • Channels: 8 or 4
  • Common mode: ±7 V maximum
  • Differential Inputs: ±25 V maximum
  • Input Sensitivity: ± 200 mV
  • Input Hysteresis: 50 mV typical
  • Input Impedance: Internal 12kΩ minimum
  • Input Bias: Non-inverting 4.7kΩ to Vcc
  • Inverting 4.7kΩ to Vcc / 2.35kΩ to Gnd (1.67V)
  • Absolute max input: ± 25 V differential

Counter Section

  • Counter type: LS7766 32-bit Dual Axis Quadrature Counter
  • Quad (A&B) inputs: 9.6MHz maximum
  • Separation: 26ns minimum
  • A&B pulse width: 52ns minimum
  • Index pulse width: 32ns minimum
  • Non-Quad (A) input: 40MHz maximum
  • Low/Hi pulse width: 12ns minimum
  • B input (direction) : 12ns minimum setup time; 10ns minimum hold time
  • Index pulse width: 32ns minimum
  • High Filter Clock: MCR0 bit 7 low = 33MHz; MCR0 bit 7 high = 16.5MHz
  • Low Filter Clock: MCR0 bit 7 low = 8.25MHz; MCR0 bit 7 high = 4.125MHz

CPLD Controller Section

  • Interrupt sources: LS7766 FLGa / FLGb outputs
  • FLGa sources: Index, Carry, Borrow, Compare
  • FLGb sources: Sign, Up/Down
  • I/O Address Space: 8-bytes per channel (64-bytes for 8-channel board)


  • Operating temp.: 0°C to 70°C standard;
  • -40°C to +85°C (-T option)
  • Storage temp.: -50°C to +120°C
  • Humidity: Up to 95 % non-condensing
  • Size: 4.825” length by 3.875” tall
  • Power Required: +5V @ 400mA typical (no sensors connected)
  • Connections: DB78 connector

Regulatory Compliance

  • This product is designed to be in full compliance with CE requirements.
ModelDescriptionPrice (USD)

8-Channel Up/Down Counter Quadrature Input PCI Card


4-Channel Up/Down Counter Quadrature Input PCI Card

CAB78F-37/1 6′ round-wire cable, DB78 female connector terminates in one DB37 female connector $50
STB-37/1F Kit Screw terminal kit includes one STB-37, round-wire cable, and six inch SNAP-TRACK-6 $95
STB-37/1F Kit-CL STB-37/1F Kit with two DIN clips to allow mounting STB-37 on SNAP-TRACK-6 onto a DIN-RAIL $114
CAB78F-37/2 6′ round-wire “Y” cable, DB78 female connector terminates in two DB37 female connectors $70
STB-37/2F Kit Screw terminal kit includes two STB-37’s, round-wire “Y” cable, and one foot SNAP-TRACK $159
STB-37/2F Kit-CL STB-37/2F Kit with four DIN clips to allow mounting STB-37’s on SNAP-TRACK onto a DIN-RAIL $178
Model Options (call for pricing)
-T Industrial operating temperature (-40°C to +85°C)
-RoHS RoHS compliant version
-S0x Special designator for custom filter clock rate, etc.