104-QUAD-8 Quadrature Encoder Input Cards
Eight, Six, and Four Channel Digital Counter/Quadrature Encoder Input on PC/104
Features
- 4, 6, or 8 channels of quadrature encoder inputs and channel index inputs
- Counts outputs from up to eight quadrature encoders
- Three differential channels per encoder, including dual axis and index
- Differential cable break detection
- Input ranges: ±25V and ±7V common mode
- 4.3MHz maximum clock rate
- Individual software reset for each channel
- Standard counting and alarm functions
- Programmable for counting, speed, and direction; limit setting with interrupts
- Factory flexible interrupt options
Features
- RoHS compliant version
Price range: $324.00 through $439.00
In StockDescription
PC/104 Digital Quadrature Encoder Input Board
The 104-QUAD-8 card is a general purpose Quadrature Encoder Counter/Interface board. It is provided in the popular 104 format and conditions and monitors the outputs of 8 encoders. I/O connectors are right-angle 34-pin headers.
These functions include anything that can be programmed into the versatile LSI/CSI LS7266R1 integrated circuit. These functions include speed, direction and total count. By providing these functions, it frees the computer for higher level applications.
The ability to provide an interrupt for a parameter, such as total count, further frees the computer from the necessity of constantly reading the position of an encoder.
Interrupts are directed to levels #2 through #7, #10 through #12, and #15 by jumper installation.
The 104-QUAD-8 card is designed for industrial applications. Each input line is buffered and capable of utilizing inputs up to 25 volts. A +5 Volt source is available for appropriate encoders.
Differential Cable-Break Detection
When the board is configured for Differential (DIFF) encoder inputs, the 104-QUAD-4/8 provides hardware-level cable-break (open-wire) detection on each differential input pair (A, B, and Index). The differential receivers include built-in biasing and termination networks that allow the board to detect when an encoder line becomes disconnected, cut, or otherwise open.
The condition of each differential input pair is reported in the Differential Encoder Cable Status Register (offset +17h), allowing software to identify a cable-break event, trigger a fault response, or implement safety handling.
Cable-break detection is only available when:
- The input mode is set to DIFF / Input termination is enabled (via jumper settings).
This feature is not available in TTL (single-ended) mode.
The conditioned inputs are connected to LSI/CSI LS7266R1 integrated circuits. These circuits are the heart of the card’s operation. They may be programmed for a variety of functions.
The 104-QUAD-8 occupies 32 bytes of I/O address space. The base address is selectable via jumpers anywhere within the range of 100-3E0 hex. An illustrated setup program is provided with the 104-QUAD-8 card. Interactive displays show locations and proper settings of jumpers to set up board address and interrupt levels.
Applications
- Automatic Test Systems
- Laboratory Automation
- Robotics
- Machine Control
- Security Systems, Energy Management
Modified-COTS (MCOTS) Customization
ACCES can tailor any standard product to your precise requirements — electrical, mechanical, firmware, environmental, or connector-level. Common MCOTS options include alternate I/O ranges, isolation enhancements, firmware changes, private labeling, conformal coating, extended temperature operation, ruggedized enclosures, and military-grade components. If this product is close but not a perfect fit, our engineering team can deliver a rapid-turn MCOTS variant with minimal NRE and dependable, Made-in-USA quality.
Downloads
Manuals
Software
- 104-QUAD Family Software Package ( -- Last Uploaded 2025-05-07)
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 7 -> 11, 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, 2000, and XP.
Samples
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#, and Delphi, with many devices including samples in Visual Basic (5 and .NET), Visual C/C++, and Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.
Drivers
Drivers for various operating systems are also provided, including active support for Windows 7 -> 11 — 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, Windows 2000, XP, and more, but support for these operating systems is considered deprecated.
Setup Programs and Utilities
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 acquisition 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.
Power Consumption
- +5 Volts: 260mA
Inputs
- Receiver Type: AM26LS32 provides differential conditioning
- Configuration: Each Encoder Channel consists of Phase A Input, Phase B Input and Index Input
- Number of Channels: 8
- Common mode input range: ±7 V maximum
- Differential Input Range: ±7 V typical
- Input Sensitivity: ±200 mV
- Input Hysteresis: 50 mV Typical
- Absolute maximum input differential: ±25 V
- Single Ended Input Range: +1.6 to +7 V for high, -7 to +1.2 V for low
Counters
- Counter Type: LS7266R1 24 bit Dual Axis Quadrature Counter
- Quadrature Input Frequency: 4.3 MHz maximum
- Separation: 57 ns min
- Input A or B High Pulse Width: 115 ns min
- Index Pulse width: 85 ns min
- Non Quadrature Input Frequency: 30 MHz maximum
- Input A: high pulse width 16 ns min
- Filter Clock (FCK): Same as Bus Clock (normally 8.33 MHz), Optional Crystal available (33MHz)
- Digital Filter rate: Same as FCK
Interrupt Controller
- Controller Type: CPLD
- Interrupts: Jumper Selectable (2-7, 10-12, 15)
- Interrupt Sources: All Carry/Borrow outputs from LS7266R1s
All Index Inputs - Addressing: ISA bus address is set by jumpers
Environmental
- Operating Temperature: 0°C to +70°C (Optional -40°C to +85°C)
- Storage Temperature: -50°C to +120°C
- Humidity: up to 95% RH, non-condensing
CE testing & approval must be done at the system level, in the designed enclosure, and is not done on individual boards.
| Model | Description | Price (USD) | |
|---|---|---|---|
| 104-QUAD-8 | 8-Channel PC/104 Digital Quadrature Encoder Input Board | $439.00 | |
| 104-QUAD-6 | 6-Channel PC/104 Digital Quadrature Encoder Input Board | $379.00 | |
| 104-QUAD-4 | 4-Channel PC/104 Digital Quadrature Encoder Input Board | $324.00 |
| Accessories | ||
|---|---|---|
| STB-34 | Screw terminal board, 34-pin connector $44 | |
| C104-34F-12 | Ribbon cable, DB34 Female to Female, 12″ $12 | |
| Model Options (call for pricing) | ||
| -RoHS | RoHS-compliant version | |