Tektronix DAS-1700 Series Users Guide

DAS-1700 Series

User’s Guide

A GREATER MEASURE OF CONFIDENCE

The information contained in this manual is believed to be accurate and reliable. However, the manufac­turer assumes no responsibility for its use; nor for any infringements of patents or other rights of third
parties that may result from its use. No license is granted by implication or otherwise under any patent
rights of the manufacturer.

THE MANUFACTURER SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, OR CON­SEQUENTIAL DAMA GES RELATED TO THE USE OF THIS PR ODUCT. THIS PR ODUCT IS NO T
DESIGNED WITH COMPONENTS OF A LEVEL OF RELIABILITY THAT IS SUITED FOR USE
IN LIFE SUPPORT OR CRITICAL APPLICATIONS.

DriverLINX, SSTNET, and LabOBJX are registered trademarks and Driv erLINX/VB is a trademark of
Scientific Software Tools, Inc.

Microsoft and Windows are registered trademarks and Visual C++ and Visual Basic are trademarks of
Microsoft Corporation.

Borland is a registered trademark and Borland C++, Delphi, and Turbo Pascal are trademarks of Bor­land International, Inc.

IBM is a registered trademark of International Business Machines Corporation.

Acrobat is a registered trademark of Adobe Systems Incorporated.

All other brand and product names are trademarks or registered trademarks of their respective
companies.

Copyright © Keithley Instruments, Inc., 1999, 1996.

All rights reserved. Reproduction or adaptation of any part of this documentation beyond that permitted
by Section 117 of the 1979 United States Copyright Act without permission of the Copyright owner is
unlawful.

WARRANTY

Hardware

Keithley Instruments, Inc. warrants that, for a period of one (1) year from the date of shipment (3 years for Models 2000,
2001, 2002, 2010 and 2700), the Keithley Hardware product will be free from defects in materials or workmanship. This
warranty will be honored provided the defect has not been caused by use of the Keithley Hardware not in accordance with
the instructions for the product. This warranty shall be null and void upon: (1) any modification of Keithley Hardware that
is made by other than Keithley and not approved in writing by Keithley or (2) operation of the Keithley Hardware outside
of the environmental specifications therefore.

Upon receiving notification of a defect in the Keithley Hardware during the warranty period, Keithley will, at its option,
either repair or replace such Keithley Hardware. During the first ninety days of the warranty period, Keithley will, at its
option, supply the necessary on site labor to return the product to the condition prior to the notification of a defect. Failure
to notify Keithley of a defect during the warranty shall relieve Keithley of its obligations and liabilities under this
warranty.

Other Hardware

The portion of the product that is not manufactured by Keithley (Other Hardware) shall not be covered by this warranty,
and Keithley shall have no duty of obligation to enforce any manufacturers' warranties on behalf of the customer. On those
other manufacturers’ products that Keithley purchases for resale, Keithley shall have no duty of obligation to enforce any
manufacturers’ warranties on behalf of the customer.

Software

Keithley warrants that for a period of one (1) year from date of shipment, the Keithley produced portion of the software or
firmware (Keithley Software) will conform in all material respects with the published specifications provided such Keithley
Software is used on the product for which it is intended and otherwise in accordance with the instructions therefore.
Keithley does not warrant that operation of the Keithley Software will be uninterrupted or error-free and/or that the Keithley
Software will be adequate for the customer's intended application and/or use. This warranty shall be null and void upon any
modification of the Keithley Software that is made by other than Keithley and not approved in writing by Keithley.

If Keithley receives notification of a Keithley Software nonconformity that is covered by this warranty during the warranty
period, Keithley will review the conditions described in such notice. Such notice must state the published specification(s)
to which the Keithley Software fails to conform and the manner in which the Keithley Software fails to conform to such
published specification(s) with sufficient specificity to permit Keithley to correct such nonconformity. If Keithley deter­mines that the Keithley Software does not conform with the published specifications, Keithley will, at its option, provide
either the programming services necessary to correct such nonconformity or develop a program change to bypass such
nonconformity in the Keithley Software. Failure to notify Keithley of a nonconformity during the warranty shall relieve
Keithley of its obligations and liabilities under this warranty.

Other Software

OEM software that is not produced by Keithley (Other Software) shall not be covered by this warranty, and Keithley shall
have no duty or obligation to enforce any OEM's warranties on behalf of the customer.

Other Items

Keithley warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes,
and documentation.

Items not Covered under Warranty

This warranty does not apply to fuses, non-rechargeable batteries, damage from battery leakage, or problems arising from
normal wear or failure to follow instructions.

Limitation of Warranty

This warranty does not apply to defects resulting from product modification made by Purchaser without Keithley's express
written consent, or by misuse of any product or part.

Disclaimer of Warranties

EXCEPT FOR THE EXPRESS WARRANTIES ABOVE KEITHLEY DISCLAIMS ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ALL IMPLIED WARRANTIES OF MERCHANT­ABILITY AND FITNESS FOR A PARTICULAR PURPOSE. KEITHLEY DISCLAIMS ALL WARRANTIES WITH
RESPECT TO THE OTHER HARDWARE AND OTHER SOFTWARE.

Limitation of Liability

KEITHLEY INSTRUMENTS SHALL IN NO EVENT, REGARDLESS OF CAUSE, ASSUME RESPONSIBILITY FOR
OR BE LIABLE FOR: (1) ECONOMICAL, INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, PUNITIVE OR
EXEMPLARY DAMAGES, WHETHER CLAIMED UNDER CONTRACT, TORT OR ANY OTHER LEGAL THEORY,
(2) LOSS OF OR DAMAGE TO THE CUSTOMER'S DATA OR PROGRAMMING, OR (3) PENALTIES OR PENALTY
CLAUSES OF ANY DESCRIPTION OR INDEMNIFICATION OF THE CUSTOMER OR OTHERS FOR COSTS, DAM­AGES, OR EXPENSES RELATED TO THE GOODS OR SERVICES PROVIDED UNDER THIS WARRANTY.

Keithley Instruments, Inc.

Sales Offices: BELGIUM: Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02-363 00 40 • Fax: [phone]

CHINA: Yuan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-6202-2886 • Fax: [phone]
FINLAND: Tietäjäntie 2 • 02130 Espoo • Phone: [phone] • Fax: [phone]
FRANCE: 3, allée des Garays • 91127 Palaiseau Cédex • 01-64 53 20 20 • Fax: [phone]
GERMANY: Landsberger Strasse 65 • 82110 Germering • 089/84 93 07-40 • Fax: [phone]
GREAT BRITAIN: Unit 2 Commerce Park, Brunel Road • Theale • Berkshire RG7 4AB • 0118 929 7500 • Fax: [phone]
INDIA: Flat 2B, Willocrissa • 14, Rest House Crescent • Bangalore 560 001 • 91-80-509-1320/21 • Fax: [phone]
ITALY: Viale San Gimignano, 38 • 20146 Milano • 02-48 39 16 01 • Fax: [phone]
JAPAN: New Pier Takeshiba North Tower 13F • 11-1, Kaigan 1-chome • Minato-ku, Tokyo 105-0022 • 81-3-5733-7555 • Fax: [phone]
KOREA: 2FL., URI Building • 2-14 Yangjae-Dong • Seocho-Gu, Seoul 137-888 • 82-2-574-7778 • Fax: [phone]
NETHERLANDS: Postbus 559 • 4200 AN Gorinchem • 0183-635333 • Fax: [phone]
SWEDEN: c/o Regus Business Centre • Frosundaviks Allé 15, 4tr • 169 70 Solna • 08-509 04 679 • Fax: [phone]
SWITZERLAND: Kriesbachstrasse 4 • 8600 Dübendorf • 01-821 94 44 • Fax: [phone]
TAIWAN: 1FL., 85 Po Ai Street • Hsinchu, Taiwan, R.O.C. • 886-3-572-9077• Fax: [phone]

28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: [phone]

1-888-KEITHLEY (534-8453) • www.keithley.com

4/02

DAS-1700 Series

User’s Guide

Revision C - November 1999

Part Number: 97530

New Contact Information

Keithley Instruments, Inc.

28775 Aurora Road

Cleveland, OH 44139

Technical Support: 1-888-KEITHLEY

Monday – Friday 8:00 a.m. to 5:00 p.m (EST)

Fax: [phone]

Visit our website at http://www.keithley.com

S

The following safety precautions should be observed before using this product and any associated instrumentation.
Although some instruments and accessories would normally be used with non-hazardous voltages, there are situations
where hazardous conditions may be present.

This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety
precautions required to avoid possible injury. Read and follow all installation, operation, and maintenance information
carefully before using the product. Refer to the manual for complete product specifications.

If the product is used in a manner not specified, the protection provided by the product may be impaired.
The types of product users are:

Responsible body

the equipment is operated within its specifications and operating limits, and for ensuring that operators are adequately
trained.

Operators

of the instrument. They must be protected from electric shock and contact with hazardous live circuits.

Maintenance personnel

the line voltage or replacing consumable materials. Maintenance procedures are described in the manual. The proce­dures explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.

Service personnel are trained to work on live circuits, and perform safe installations and repairs of products. Only

properly trained service personnel may perform installation and service procedures.
Keithley products are designed for use with electrical signals that are rated Installation Category I and Installation

Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most mea­surement, control, and data I/O signals are Installation Category I and must not be directly connected to mains voltage
or to voltage sources with high transient over-voltages. Installation Category II connections require protection for high
transient over-voltages often associated with local AC mains connections. Assume all measurement, control, and data
I/O connections are for connection to Category I sources unless otherwise marked or described in the Manual.

Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or
test fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels
greater than 30V RMS, 42.4V peak, or 60VDC are present.

age is present in any unknown circuit before measuring.

Operators of this product must be protected from electric shock at all times. The responsible body must ensure that
operators are prevented access and/or insulated from every connection point. In some cases, connections must be ex­posed to potential human contact. Product operators in these circumstances must be trained to protect themselves from
the risk of electric shock. If the circuit is capable of operating at or above 1000 volts,

may be exposed.

Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance
limited sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards,
install protective devices to limit fault current and voltage to the card.

Before operating an instrument, make sure the line cord is connected to a properly grounded power receptacle. Inspect
the connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.

is the individual or group responsible for the use and maintenance of equipment, for ensuring that

use the product for its intended function. They must be trained in electrical safety procedures and proper use

perform routine procedures on the product to keep it operating properly, for example, setting

afety Precautions

A good safety practice is to expect that hazardous volt-

no conductive part of the circuit

5/02

When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main
input power disconnect device must be provided, in close proximity to the equipment and within easy reach of the
operator.

For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the cir­cuit under test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting
or disconnecting cables or jumpers, installing or removing switching cards, or making internal changes, such as in­stalling or removing jumpers.

Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth)
ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the
voltage being measured.

The instrument and accessories must be used in accordance with its specifications and operating instructions or the
safety of the equipment may be impaired.

Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and op­erating information, and as shown on the instrument or test fixture panels, or switching card.

When fuses are used in a product, replace with same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth ground con-

nections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation re-

quires the use of a lid interlock.

If or is present, connect it to safety earth ground using the wire recommended in the user documentation.

!

The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.

The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined
effect of normal and common mode voltages. Use standard safety precautions to avoid personal contact with these
voltages.

The

WARNING

associated information very carefully before performing the indicated procedure.
The

CAUTION

the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains circuits, including the power

transformer, test leads, and input jacks, must be purchased from Keithley Instruments. Standard fuses, with applicable
national safety approvals, may be used if the rating and type are the same. Other components that are not safety related
may be purchased from other suppliers as long as they are equivalent to the original component. (Note that selected parts
should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product.) If you
are unsure about the applicability of a replacement component, call a Keithley Instruments office for information.

To clean an instrument, use a damp cloth or mild, water based cleaner. Clean the exterior of the instrument only. Do
not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist
of a circuit board with no case or chassis (e.g., data acquisition board for installation into a computer) should never
require cleaning if handled according to instructions. If the board becomes contaminated and operation is affected,
the board should be returned to the factory for proper cleaning/servicing.

heading in a manual explains dangers that might result in personal injury or death. Always read the

heading in a manual explains hazards that could damage the instrument. Such damage may invalidate

Table of Contents

Preface

1

Overview

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

Supporting Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

Setup and Installation

2

Unpacking the Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

Setting the Base Address Switch. . . . . . . . . . . . . . . . . . . . . . .2-2

Installing the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Installing the DAS-1700 Series Standard Software Package .2-3

Before Installing DriverLINX . . . . . . . . . . . . . . . . . . . . . .2-3

Selecting the DriverLINX components to Install. . . . . . . .2-4

Installing DriverLINX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Installing the Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

Configuration of the DAS-1700 Board with DriverLINX . . . . . .2-7

3

Cabling and Wiring

Attaching Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

STA-1800U Screw Terminal Accessory . . . . . . . . . . . . . . . . .3-1

STP-50 Screw Terminal Panel. . . . . . . . . . . . . . . . . . . . . . . . .3-6

SSH-8 Accessory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7

MB01 Backplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8

MB02 Expansion Backplane. . . . . . . . . . . . . . . . . . . . . . . . . .3-8

EXP-1800 Expansion Accessory. . . . . . . . . . . . . . . . . . . . . .3-11

Connecting Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12

Single-Ended Analog Input Signals . . . . . . . . . . . . . . . . . . .3-14

Differential Analog Input Signals . . . . . . . . . . . . . . . . . . . . .3-15

Avoiding a Ground Loop Problem . . . . . . . . . . . . . . . . . . . .3-17

Analog Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-18

Digital Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19

Synchronizing the Start of Operations on Multiple Boards .3-20

iii

4

Testing the Board

DriverLINX Analog I/O Panel. . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

Test Panel Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Troubleshooting

5

Problem Isolation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

Using the DriverLINX Event Viewer . . . . . . . . . . . . . . . . . . .5-1

Device Initialization Error Messages . . . . . . . . . . . . . . . . . . .5-2

Identifying Symptoms and Possible Causes . . . . . . . . . . . . . . . .5-2

Testing the Board and the Computer. . . . . . . . . . . . . . . . . . . .5-5

Testing the Accessory Slot and I/O Connections . . . . . . . . . .5-5

Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

Calibrating the Board

6

Equipment Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2

Potentiometers and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . .6-2

DriverLINX Calibration Utility . . . . . . . . . . . . . . . . . . . . . . . . . .6-5

7

Functional Description

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1

Analog Input Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-6

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-6

Input Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-6

Single-Ended Input Configuration. . . . . . . . . . . . . . . . .7-6

Differential Input Configuration . . . . . . . . . . . . . . . . . .7-7

Channel Expansion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-7

Gains and Ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8

Channel Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-9

Selecting a Single Channel . . . . . . . . . . . . . . . . . . . . .7-10

Selecting Channels Using Automatic

Channel Scanning . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-10

Selecting Channels Using the Channel-Gain Queue. .7-10

Conversion Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-13

Paced Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-14

Burst Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-14

Burst Mode with SSH . . . . . . . . . . . . . . . . . . . . . . . . . . .7-15

Clock Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-15

Pacer Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-15

Internal A/D Pacer Clock . . . . . . . . . . . . . . . . . . . . . .7-16

External Pacer Clock. . . . . . . . . . . . . . . . . . . . . . . . . .7-16

Burst Mode Conversion Clock. . . . . . . . . . . . . . . . . . . . .7-16

iv

Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-17

Trigger Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-17

Software Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-17

External Digital Trigger. . . . . . . . . . . . . . . . . . . . . . . .7-18

Trigger Acquisition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-19

Post-Trigger Acquisition . . . . . . . . . . . . . . . . . . . . . . .7-19

Pre-Trigger Acquisition. . . . . . . . . . . . . . . . . . . . . . . .7-20

About-Trigger Acquisition . . . . . . . . . . . . . . . . . . . . .7-20

Hardware Gate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-20

Data Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-22

Using Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-22

Using DMA Resources . . . . . . . . . . . . . . . . . . . . . . . .7-22

Analog Output Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-23

DAS-1701ST-DA and DAS-1702ST-DA Boards . . . . . . . . .7-23

DAS-1702HR-DA Boards. . . . . . . . . . . . . . . . . . . . . . . . . . .7-24

DAS-1701AO and DAS-1702AO Boards . . . . . . . . . . . . . . .7-24

Output Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-24

Pacer Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-25

Internal D/A Pacer Clock . . . . . . . . . . . . . . . . . . . . . .7-25

External Pacer Clock. . . . . . . . . . . . . . . . . . . . . . . . . .7-25

Clock Used for an Analog Input Operation. . . . . . . . .7-26

Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-26

Software Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-26

External Digital Trigger. . . . . . . . . . . . . . . . . . . . . . . .7-27

Hardware Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-27

Data Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-28

Using Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-28

Using DMA Resources . . . . . . . . . . . . . . . . . . . . . . . .7-28

Using Recycle Mode. . . . . . . . . . . . . . . . . . . . . . . . . .7-29

Digital I/O Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-29

Digital Control Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-29

Strobe Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-30

Trigger/Gate Output Signal. . . . . . . . . . . . . . . . . . . . . . . . . .7-30

SSH Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-32

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-33

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-34

Specifications

A

v

B

Connector Pin Assignments

Main I/O Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

STA-1800U I/O Connectors J1 and J2. . . . . . . . . . . . . . . . . . . . B-3

STA-1800U I/O Connector J3 . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

STA-1800U I/O Connectors J4 to J7 and

Jumper Pads J8 to J11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

C

DriverLINX Configuration Notes

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Calibrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

A/D Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

A/D Volts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

D/A Volts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

AI IRQ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4

AI DMA 1, AO DMA 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4

Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4

Special Device Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4

Common-mode reference . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4

Number of EXP-1800s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5

Simultaneous sample and hold configuration . . . . . . . . . . . . C-5

Disable AO recycle mode . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5

Implementation Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6

Analog Input Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8

Analog Input Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . C-8

Internal Clocking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8

Burst Mode Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8

Repeat Mode Sampling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-9

External Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-9

External Triggering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-9

External Gating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-10

Simultaneous Sampling. . . . . . . . . . . . . . . . . . . . . . . . . . . . C-10

Analog Input Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . C-10

Data Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-12

A/D Conversion Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-14

A/D Data Lost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-14

Analog Output Subsystem. . . . . . . . . . . . . . . . . . . . . . . . . . C-14

Analog Output Initialization. . . . . . . . . . . . . . . . . . . . . . C-15

Internal Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-15

Synchronous Analog Input/Output Clocking. . . . . . . . . C-16

External Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-16

vi

External Triggering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-17

Data Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-17

D/A Conversion Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-18

D/A Data Lost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-19

Digital Input and Output Subsystems . . . . . . . . . . . . . . . . . . . C-19

Logical Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-19

Digital Input Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . C-20

Digital Output Initialization . . . . . . . . . . . . . . . . . . . . . . . . C-20

Digital I/O Conversion Delay . . . . . . . . . . . . . . . . . . . . . . . C-20

Digital I/O Data Lost. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-20

Counter/Timer Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-21

Counter/Timer Initialization . . . . . . . . . . . . . . . . . . . . . . . . C-21

Counter/Timer Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . C-21

D

CE Information
for the DAS-1700 Series

Limitation of Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

Cabling Instructions for the CE Configuration . . . . . . . . . . . . . D-3

Index

List of Figures

Figure 2-1. Location of the Base Address Switch . . . . . . . . . .2-2

Figure 3-1. Connector Layout of an STA-1800U. . . . . . . . . . .3-2

Figure 3-2. Attaching an STA-1800U to a

DAS-1700 Series Board. . . . . . . . . . . . . . . . . . . . .3-3

Figure 3-3. Pin Assignments for the Main I/O Connector

of a DAS-1700 Series Board . . . . . . . . . . . . . . . . .3-4

Figure 3-4. Pin Assignments for Connectors J1 and J2

of the STA-1800U . . . . . . . . . . . . . . . . . . . . . . . . .3-5

Figure 3-5. Attaching an STP-50 to a

DAS-1700 Series Board. . . . . . . . . . . . . . . . . . . . .3-6

Figure 3-6. Screw Terminal Assignments for the STP-50 . . . .3-6

Figure 3-7. Attaching an SSH-8 to a DAS-1700ST or

DAS-1700AO Series Board. . . . . . . . . . . . . . . . . .3-7

Figure 3-8. Attaching an MB01 Backplane to a

DAS-1700 Series Board. . . . . . . . . . . . . . . . . . . . .3-8

Figure 3-9. Attaching MB02 Expansion Backplanes to an

STA-1800U . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9

vii

Figure 3-10. Daisy-Chaining STA-1800Us with

Attached MB02s . . . . . . . . . . . . . . . . . . . . . . . . .3-10

Figure 3-11. Daisy-Chaining EXP-1800s. . . . . . . . . . . . . . . . .3-11

Figure 3-12. Single-Ended Inputs (SIngle Channel) . . . . . . . .3-14

Figure 3-13. Single-Ended Inputs (Multiple Channels) . . . . . .3-15

Figure 3-14. Differential Inputs . . . . . . . . . . . . . . . . . . . . . . . .3-16

Figure 3-15. Avoiding a Ground Loop Problem . . . . . . . . . . .3-18

Figure 3-16. Voltage Output. . . . . . . . . . . . . . . . . . . . . . . . . . .3-18

Figure 3-17. Synchronizing the Start of Operations on

Multiple Boards . . . . . . . . . . . . . . . . . . . . . . . . . .3-20

Figure 6-1. DAS-1701ST and DAS-1702ST . . . . . . . . . . . . . .6-3

Figure 6-2. DAS-1702HR. . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3

Figure 6-3. DAS-1701ST-DA and DAS-1702ST-DA . . . . . . .6-4

Figure 6-4. DAS-1702HR-DA . . . . . . . . . . . . . . . . . . . . . . . . .6-4

Figure 6-5. DAS-1701AO and DAS-1720AO . . . . . . . . . . . . .6-5

Figure 7-1. Block Diagram of DAS-1701ST, DAS-1702ST,

and DAS-1702HR Board. . . . . . . . . . . . . . . . . . . .7-2

Figure 7-2. Block Diagram of DAS-1701ST-DA and

DAS-1702ST-DA Board . . . . . . . . . . . . . . . . . . . .7-3

Figure 7-3. Block Diagram of DAS-1702HR-DA Board. . . . .7-4

Figure 7-4. Block Diagram of DAS-1701AO and

DAS-1702AO Board . . . . . . . . . . . . . . . . . . . . . . .7-5

Figure 7-5. Conversion Modes. . . . . . . . . . . . . . . . . . . . . . . .7-14

Figure 7-6. Initiating Conversions with an

External Digital Trigger. . . . . . . . . . . . . . . . . . . .7-19

Figure 7-7. Hardware Gate. . . . . . . . . . . . . . . . . . . . . . . . . . .7-21

Figure 7-8. Timing Relationship between Data from

DO0 to DO3 and Latch Strobe DOSTB . . . . . . .7-30

Figure 7-9. Timing for the TGOUT Signal . . . . . . . . . . . . . .7-31

Figure 7-10. Timing for SSHO Signal When

Not Used for SSH Hardware . . . . . . . . . . . . . . . .7-33

Figure B-1. Main I/O Connector . . . . . . . . . . . . . . . . . . . . . . . B-2

Figure B-2. STA-1800U I/O Connectors J1 and J2. . . . . . . . . B-3

Figure B-3. STA-1800U I/O Connector J3 . . . . . . . . . . . . . . . B-4

Figure B-4. STA-1800U I/O Connectors J4 to J7 and

Jumper Pads J8 to J11 . . . . . . . . . . . . . . . . . . . . . B-5

Figure D-1. ENCL-4 Enclosure with

Four EXP-1800s Installed . . . . . . . . . . . . . . . . . . D-3

Figure D-2. Connecting the DAS-1700 Series Board

to an EXP-1800, FWA-EXP, and FWA-1800U . . D-4

viii

List of Tables

Table 1-1. Basic Features of DAS-1700 Series Boards . . . . .1-2

Table 2-1. I/O Address Map (000H to 3FFH). . . . . . . . . . . . .2-7

Table 3-1. STA-1800U Labels for DAC Outputs . . . . . . . . . .3-5

Table 5-1. Troubleshooting Information. . . . . . . . . . . . . . . . .5-3

Table 7-1. Analog Input Ranges . . . . . . . . . . . . . . . . . . . . . . .7-9

Table 7-2. Maximum Throughput with Fixed Range . . . . . .7-12

Table A-1. DAS-1700ST Series -

Analog Input Specifications. . . . . . . . . . . . . . . . . A-2

Table A-2. DAS-1700HR Series -

Analog Input Specifications. . . . . . . . . . . . . . . . . A-5

Table A-3. DAS-1700AO Series -

Analog Input Specifications. . . . . . . . . . . . . . . . . A-8

Table A-4. DAS-1701ST-DA and DAS-1702ST-DA -

Analog Output Specifications . . . . . . . . . . . . . . A-11

Table A-5. DAS-1702HR-DA -

Analog Output Specifications . . . . . . . . . . . . . . A-12

Table A-6. DAS-1700AO Series -

Analog Output Specifications . . . . . . . . . . . . . . A-12

Table A-7. DAS-1700 Series - Digital I/O Specifications. . A-14
Table A-8. DAS-1701ST, DAS-1702ST, and

DAS-1702HR - Power Supply Requirements . . A-14
Table A-9. DAS-1701ST-DA, DAS-1702ST-DA, and

DAS-1702HR-DA -

Power Supply Requirements . . . . . . . . . . . . . . . A-15

Table A-10. DAS-1700AO Series -

Power Supply Requirements . . . . . . . . . . . . . . . A-15

Table C-1. Modes Supported by DAS-1700 Models. . . . . . . C-6

Table C-2. Allowed Operations and Events for

Supported Subsystem Modes. . . . . . . . . . . . . . . . C-6

Table C-3. Table of logical channel numbers for

eight external EXP-1800 Multiplexers. . . . . . . . C-11

ix

Preface

The

DAS-1700 Series User’s Guide

install and use the following boards:

Series Boards

DAS-1700ST DAS-1701ST, DAS-1701ST-DA,

DAS-1702ST, DAS-1702ST-DA
DAS-1700HR DAS-1702HR, DAS-1702HR-DA
DAS-1700AO DAS-1701AO, DAS-1702AO

The manual is intended for data acquisition system designers, engineers,
technicians, scientists, and other users responsible for installing, starting
up, and wiring signals to DAS-1700 Series boards. To follow the
information and instructions contained in this manual, you must be
familiar with the operation of an IBM PC or compatible in the Windows
95/98 or Windows NT environment. You must also be familiar with data
acquisition principles and their applications.

provides the information needed to

The

DAS-1700 Series User’s Guide

●

Section 1 provides an overview of the features of DAS-1700 Series

is organized as follows:

boards, including a description of supported software and accessories.

●

Section 2 describes how to unpack, install, configure, and start up
DAS-1700 Series boards and DriverLINX software.

Section 3 describes how to attach accessories and how to wire signals

●

to DAS-1700 Series boards.
Section 4 describes how to use the DriverLINX Analog I/O Panel for

●

testing the functions of DAS-1700 Series boards.
Section 5 provides troubleshooting information.

●

xi

Section 6 describes how to calibrate DAS-1700 Series boards.

●

●

Section 7 provides a detailed description of the features of DAS-1700
Series boards.

●

Appendix A lists the specifications for DAS-1700 Series boards.
Appendix B lists the pin assignments for the main I/O connectors of

●

DAS-1700 Series boards and for the connectors of DAS-1700 Series
accessories.

Appendix C contains DriverLINX configuration information for the

●

DAS-1700 Series boards.
Appendix D contains information on CE certification.

●

An index completes this manual.

xii

Features

1

Overview

This section discusses the following subjects:

●

Features

●

Supporting Software

DAS-1700 Series boards.

●

Accessories

for DAS-1700 Series boards.

The DAS-1700 Series is a family of high-performance analog and digital
I/O boards with DriverLINX software that requires:

— an overview of the features of DAS-1700 Series boards.

— a description of the software available for

— a description of the hardware accessories available

●

an IBM PC or compatible AT (386, or Pentium CPU) with minimum
of 2 MB of memory

●

at least one CD-ROM, floppy, and fixed disk drive
Microsoft Windows 95/98, or Windows NT 4.0 or higher

●

●

a computer supporting Microsoft Windows development

●

a mouse is highly recommended

Features 1-1

The basic features of the DAS-1700 Series boards are listed in Table 1-1.

Table 1-1. Basic Features of DAS-1700 Series Boards

Series Boards Basic Features

DAS-1700ST DAS-1701ST Analog input: 16 single-ended or eight differential channels,

12-bit resolution, 166.67 ksamples/s maximum throughput,
gains of 1, 5, 50, and 250
Digital I/O: four input lines, four output lines

DAS-1701ST-DA Analog input: 16 single-ended or eight differential channels,

12-bit resolution, 166.67 ksamples/s maximum throughput,
gains of 1, 5, 50, and 250
Analog output: four 12-bit DACs, ±10 V range
Digital I/O: four input lines, four output lines

DAS-1702ST Analog input: 16 single-ended or eight differential channels,

12-bit resolution, 166.67 ksamples/s maximum throughput,
gains of 1, 2, 4, and 8
Digital I/O: four input lines, four output lines

DAS-1702ST-DA Analog input: 16 single-ended or eight differential channels,

12-bit resolution, 166.67 ksamples/s maximum throughput,
gains of 1, 2, 4, and 8
Analog output: four 12-bit DACs, ±10 V range
Digital I/O: four input lines, four output lines

DAS-1700HR DAS-1702HR Analog input: 16 single-ended or eight differential channels,

16-bit resolution, 50 ksamples/s maximum throughput,
gains of 1, 2, 4, and 8
Digital I/O: four input lines, four output lines

DAS-1702HR-DA Analog input: 16 single-ended or eight differential channels,

16-bit resolution, 50 ksamples/s maximum throughput,
gains of 1, 2, 4, and 8
Analog output: two 16-bit DACs, ±10 V range
Digital I/O: four input lines, four output lines

1-2 Overview

Table 1-1. Basic Features of DAS-1700 Series Boards (cont.)

Series Boards Basic Features

DAS-1700AO DAS-1701AO Analog input: 16 single-ended or eight differential channels,

12-bit resolution, 166.67 ksamples/s maximum throughput,
gains of 1, 5, 50, and 250
Analog output: two 12-bit DACs, ±5 V or ±10 V range,
waveform quality
Digital I/O: four input lines, four output lines

DAS-1702AO Analog input: 16 single-ended or eight differential channels,

12-bit resolution, 166.67 ksamples/s maximum throughput,
gains of 1, 2, 4, and 8
Analog output

: two 12-bit DACs, ±5 V or ±10 V range,
waveform quality
Digital I/O: four input lines, four output lines

Additional features of DAS-1700 Series boards are as follows:

●

The boards support up to 256 analog input channels using EXP-1800
or MB02 expansion accessories.

●

Analog input channels are individually software-selectable for gain.
A 256-location hardware channel-gain queue supports the sampling

●

of analog input channels at the same or different gains, in sequential
or nonsequential channel order.

●

For analog input operations on DAS-1700ST Series and
DAS-1700AO Series boards, burst mode emulates
simultaneous-sample-and-hold (SSH) using the SSH-8 accessory.

●

For analog input operations, dual-channel DMA (Direct Memory
Access) allows the acquisition of more than 65,536 samples.

●

For DAS-1700ST Series and D AS-1700HR Series boards, a hardw are
trigger/gate is supported for analog input operations; for
DAS-1700AO Series boards, a hardware trigger/gate is supported for
analog input and analog output operations. Pre-trigger, post-trigger,
and about-trigger acquisitions are supported for analog input
operations.

All boards contain a 1024-word A/D FIFO (first-in, first-out data

●

buffer for analog-to-digital operations) to ensure the continuous
sampling of analog input data at higher conversion rates;
DAS-1700AO Series boards also contain a 2048-word D/A FIFO

Features 1-3

(first-in, first-out data buffer for digital-to-analog operations) to
support recycle-mode waveform generation.

●

Pulsed interrupts allow multiple boards to share interrupt levels.

●

All connections are made through the 50-pin main I/O (input/output)
connector at the rear panel of the computer.

The boards provide ±15 V and +5 V power for external circuitry.

●

For more information on these features, refer to Section 7

Supporting Software

The following software is available for operating DAS-1700 Series
boards:

●

DAS-1700 Series standard software package

DAS-1700 Series boards. Includes DriverLINX for Microsoft
Windows 95/98 or Windows NT and function libraries for writing
application programs under W indows in a high-le vel language such as
Microsoft Visual C++, Microsoft Visual Basic, Borland Delphi
support files, LabVIEW, utility programs, and language-specific
example programs.

— Shipped with

DriverLINX —

●

the high-performance real-time data-acquisition

device drivers for Windows application development includes:
–

DriverLINX API DLLs

and drivers supporting the DAS-1700

Series hardware

–

Analog I/O Panel —

A DriverLINX program that verifies the
installation and configuration of DriverLINX to your DAS-1700
Series board and demonstrates several virtual bench-top
instruments

–

Learn DriverLINX —

an interactive learning and demonstration
program for DriverLINX that includes a Digital Storage
Oscilloscope

–

Source Code —

–

DriverLINX Application Programming Interface files —

for the sample programs

for the

DAS-1700 Series

–

LabVIEW —

1-4 Overview

support for DriverLINX

–

DriverLINX On-line Help System —

provides immediate help as

you operate DriverLINX

–

Supplemental Documentation —

on DriverLINX installation and
configuration, analog and digital I/O programming, counter/timer
programming; technical reference, and information specific to the
DAS-1700 Series hardware.

Accessories

DAS-1700 Series utilities —

●

The following utilities are provided as

part of both the DAS-1700 Series standard software packages:
– Analog I/O

Utility —

DriverLINX utility used for data acquisition

and testing board operation.

–

Test Utility —

DriverLINX utility used for testing board

operation.

–

Calibration Utility —

DriverLINX utility used for calibration.

The following accessories are available for DAS-1700 Series boards:

●

STP-50 screw terminal panel

— Provides screw terminals that
allow you to access the functions of a board; connects to the main I/O
connector of a DAS-1700 Series board through a CDAS-2000 or
SDAS-2000 cable.

STA-1800U screw terminal accessory

●

— Provides screw terminals
that allow you to access the functions of a board and connectors that
allow you to attach an MB01 backplane, MB02 expansion backplane,
or SSH-8 accessory; connects to the main I/O connector of a
DAS-1700 Series board through a CDAS-2000 or SDAS-2000 cable.

●

RMT-02 rack mount enclosure

— Allows you to mount the

STA-1800U accessory.

●

SSH-8 accessory

— An 8-channel accessory that provides
simultaneous sample-and-hold; you can use up to two SSH
accessories with a DAS-1700ST Series or DAS-1700AO Series
board. Refer to the

●

MB01 backplane

SSH-8 User’s Guide

for more information.

— A 16-channel backplane; plug-in MB Series
modules provide isolation and signal-conditioning. You can use one
MB01 backplane with a DAS-1700 Series board. Refer to the

Series User’s Guide

Accessories 1-5

for more information.

MB

MB02 expansion backplane

●

— A 16-channel expansion backplane;
plug-in MB Series modules provide isolation and signal­conditioning. You can use up to 16 MB02 expansion backplanes with
a DAS-1700 Series board. Refer to the

MB Series User’s Guide

more information.

for

EXP-1800 expansion accessory

●

— A 16-channel expansion
accessory; you can use up to 16 EXP-1800 expansion accessories
with a DAS-1700 Series board. Refer to the

EXP-1800 User’s Guide

for more information.

●

PG-408A DC/DC converter

— Required on EXP-1800 expansion

accessories that use external power.

●

C16-MB1 cable

— A cable with a 37-pin, female D-type connector
and a 26-pin, female header connector; allows you to connect an
STA-1800U screw terminal accessory to an MB01 backplane.

●

C-2600 cable

— An 18-inch ribbon cable with a 26-pin female
header connector at each end; allows you to connect an STA-1800U
screw terminal accessory to an MB02 expansion backplane.

●

CDAS-2000 and SDAS-2000 cables

— The CDAS-2000 is a
24-inch ribbon cable with a 50-pin female header connector and a
50-pin female D-type connector; it allows you to connect a
DAS-1700 Series board to an STA-1800U screw terminal accessory,
an STP-50 screw terminal panel, or an EXP-1800 expansion acces­sory. The SDAS-2000 is a shielded version of the CDAS-2000; the
SDAS-2000 is recommended for use with DAS-1700HR Series
boards.

●

CAB-50 Series cable

— A ribbon cable with a 50-pin header connec­tor on each end that allows you to daisy-chain EXP-1800 expansion
accessories. The CAB-50 is 4 inches long and is recommended when
the EXP-1800 is mounted in an ENCL enclosure; the CAB-50/1 is 18
inches long and is recommended when the EXP-1800 is mounted on
a standoff.

CACC-2000

●

— A 24-inch ribbon cable with a 50-pin female header
connector on each end; allows you to daisy-chain STA-1800U screw
terminal accessories when attaching MB02 expansion backplanes.

●

C-1800

— An 18-inch ribbon cable with a 37-pin, female D-type
connector on each end; allows you to connect an STA-1800U screw
terminal accessory to an SSH-8 accessory.

1-6 Overview

Setup and Installation

Read this section and all related DriverLINX document before you
attempt to install and use your DAS-1700 Series board.

●

Unpacking the Board

DAS-1700 Series board.

●

Installing the Software

software package.

Configuring a Board

●

on a DAS-1700 Series board.

●

Installing a Board

board.

●

Configuring DriverLINX

DriverLINX to control a DAS-1700 Series board.

— describes how to unpack and inspect a

— describes how to install the DriverLINX

— describes how to set the base address switch

— describes how to install a DAS-1700 Series

— describes how to configure

2

Unpacking the Board

To prevent any damage to your DAS-1700 Series board, perform the
following steps when unpacking the board:

1. Remove the wrapped DAS-1700 Series board from its outer shipping
carton.

2. If you are not equipped with a grounded wrist strap, discharge static
electricity by holding the wrapped board in one hand while placing
your other hand firmly on a metal portion of the computer chassis.
(Your computer must be turned OFF, but grounded.)

Note that if you are equipped with a grounded wrist strap, static
electricity is discharged as soon as you hold the wrapped board.

3. Carefully remove the board from its anti-static wrapping material.
(You may store the wrapping material for future use.)

Unpacking the Board 2-1

4. Inspect the board for signs of damage. If any damage is apparent,
arrange to return the board to the factory; refer to page 5-6 for more
information.

5. Check the remaining contents of your package against the packing
list to ensure that your order is complete. Report any missing items
immediately.

6. Once you have determined that the board is acceptable, install the
software and configure the board, using the instructions in the
following sections.

Note:

DAS-1700 Series boards are factory calibrated; they require no
further adjustment prior to installation. If at a later time you decide to
recalibrate the board, refer to Section 6 for instructions.

Setting the Base Address Switch

DAS-1700ST Series and DAS-1700HR Series boards require 16
consecutive 8-bit locations in the I/O space of your computer starting at
the base address. DAS-1700A O Series boards require 26 8-bit locations in
the I/O space of your computer: 16 consecutive locations starting at the
base address and 10 locations starting at the base address plus 400h.

DAS-1700 Series boards are shipped with a base address of 300h. If any
of the required address locations starting at base address 300h are being
used by another resource in your system (including another DAS-1700
Series board), you must reconfigure the base address using the base
address switch. The base address switch is a 6-position DIP switch
located as shown in Figure 2-1.

Base address

switch - set for

300h

Figure 2-1. Location of the Base Address Switch

2-2 Setup and Installation

On

1 2 3 4 5 6

To reset this switch to another base address, use the configuration utility
to select a new base address and then view the corresponding switch
settings in the menu box diagram. Make sure that the setting of the base
address switch on the board matches the base address setting in the
configuration file.

Installing the Software

Caution:

and test any new hardware, you should e xit all other programs and, if you
use a disk cache, disable write caching. If the system does crash and
you’re using disk compression software or a disk cache utility, as a
precaution after any crash, run the utility that checks the directory
structures.

As a precaution against a system crash the first time you install

Installing the DAS-1700 Series Standard Software Package

Important:

DAS-1700, read the
and the

Keithley DAS-1700

software. They are accessed from the DriverLINX CD-ROM after you
have installed Adobe Acrobat.

Before Installing DriverLINX

1. Inventory your DAS-1700 board’s configuration settings.

Before you begin installing any hardware or software for the

DriverLINX Installation and Configuration Guide

Appendix F: Configuration and Implementation Notes—for

manuals that are packaged with the DriverLINX

2. Determine the resources your DAS-1700 Series board requires.

3. Inventory your computer’s resources already allocated to other

installed devices.

4. Determine whether your computer has sufficient resources for your

DAS-1700 board.

Installing the Software 2-3

5. Determine whether your DAS-1700 board can use your computer’s

free resources.

6. Set any jumpers/switches to configure your DAS-1700 board to use

your computer’s free resources.

7. Set any other jumpers/switches to configure your DAS-1700 board

the way you want it to operate. Make a note of the switch and jumper
settings in order to configure the board using DriverLINX.

Selecting the DriverLINX components to Install

For your convenience in installing and uninstalling just the DriverLINX
components you need, the DriverLINX CD Browser will assist you in
selecting the components to install:

Install Drivers —

●

need for configuring your hardware and running third–party
data–acquisition applications that require DriverLINX.

Install Interfaces —

●

example programs that you will need to develop custom applications
for DriverLINX using C/C++, Visual Basic, Delphi, and LabVIEW.

●

Install Documentation —

electronic documentation for DriverLINX that you can read, search,
and print using the Adobe Acrobat Reader.

●

Install Acrobat —

Acrobat Reader for the DriverLINX electronic documentation.

Installing DriverLINX

1. Insert the DriverLINX CD-ROM into your computer’s CD-ROM

Drive.

2. Start the DriverLINX setup program. On most systems, wait a few

seconds for automatic startup. Otherwise, run the setup.exe program
from the CD-ROM.

3. The DriverLINX CD-ROM Browser Map window appears on the

screen. Click ‘Install Drivers,’ and follow the series of on-screen
instructions.

This required component installs only the files you

This optional component installs the files and

This optional component installs

This optional component installs the Adobe

2-4 Setup and Installation

T o display an explanation of a menu option on the Dri v erLINX CD

Note:

browser map that appears next and on subsequent setup screens, place the
mouse pointer over the menu item. A star next to a menu item means that
the item was selected previously.

4. Select ‘Read Me First,’ and follow the instructions.

5. Select ‘Install Documentation.’ If you do not have Adobe Acrobat

installed on your computer, install it by selecting ‘Install Adobe
Acrobat.’

6. Open the manuals appropriate to the DAS-1700 installation and read

them before installing your DAS-1700 board or configuring
DriverLINX:

– Installation and Configuration
– Appendix F: Configuration and Implementation Notes—for

Keithley DAS-1700.
– DriverLINX Technical Reference Manual
– DriverLINX Analog I/O Programming Guide
– DriverLINX Digital I/O Programming Guide
– DriverLINX Counter/Timer Programming Guide
– Appendix, I/O Port, Interrupt, and DMA Channel Usage

– Other manuals appropriate to your installation.

F

ollowing the DriverLINX prompts, turn off your computer and

7.
install your DAS-1700 board into an appropriate free slot in your
computer.

Installing the Software 2-5

Installing the Board

Caution:

board while power is ON can damage your computer.

To install a DAS-1700 Series board, perform the following steps:

1. Turn power to the computer and all attached equipment OFF.

2. Remove the computer chassis cover.

3. Select an unoccupied accessory slot. DAS-1700 Series boards require

4. Remove the corresponding blank plate from the I/O connector panel.

5. Make sure the setting of the base address switch matches the base

6. Insert and secure the board in the selected slot.

7. Replace the computer cover.

8. Turn power to the computer ON.

After you install the DAS-1700 Series board in the computer, you can
attach an accessory board and wire the appropriate signals to the board;
refer to Section 3 for information. Before writing your program, you can
test the functions of the board using the DAS-1700 Series Control Panel.
Refer to Section 4 for more information about the control panel.

Make sure that power is turned OFF. Installing or removing a

a full-size slot.

address setting in the configuration utility.

Refer to the documentation provided with your computer for more
information on installing boards.

2-6 Setup and Installation

Configuration of the DAS-1700 Board with DriverLINX

Note:

Be sure to note and follow all programming differences between

installations for Windows NT and Windows 95/98.

Be sure to make note of the configuration of all switches and jumpers on
the board. You will use this information to enter the correct configuration
parameters using DriverLINX. Also locate an y information or notes about
the interrupt and DMA channels used by the other hardware devices in
your computer system.

Table 2-1 lists I/O addresses commonly used by IBM PC/XT, AT, and
compatible computers. Determine an even boundary of eight I/O
addresses within the range of 000H to 3F8H that are not being used by
another resource in your system (including another DAS-1700 Series
board), and set the switches to the appropriate base address.

Table 2-1. I/O Address Map (000H to 3FFH)

Address Range Use

000H to 00FH 8237 DMA #1
020H to 021H 8259 PIC #1
040H to 043H 8253 timer
060H to 063H 8255 PPI (XT)
060H to 064H 8742 controller (AT)
060H to 06FH 8042 Keyboard controller
070H to 071H CMOS RAM and NMI mask register (AT)
080H to 08FH DMA page registers
0A0H to 0A1H 8259 PIC #2 (AT)
0A0H to 0AFH NMI mask register (XT)
0C0H to 0DFH 8237 DMA #2 (AT - word-mapped)
0F0H to 0FFH 80287 numeric processor (AT)

Configuration of the DAS-1700 Board with DriverLINX 2-7

Table 2-1. I/O Address Map (000H to 3FFH) (cont.)

Address Range Use

170H to 177H Hard disk controller #1
1F0H to 1F8H Hard disk controller #2
1F0H to 1FFH Hard disk controller (AT)
200H to 2FFH Game / control
210H to 21FH Expansion unit (XT)
238H to 23BH Bus mouse
23CH to 23FH Alternate bus mouse
278H to 27FH Parallel printer
2B0H to 2DFH EGA
2E0H to 2EFH GPIB (AT)
2E8H to 2EFH Serial port
2F8H to 2FFH Serial port
300H to 31FH Prototype card
320H to 32FH Hard disk (XT)
370H to 377H Floppy disk controller #2
378H to 37FH Parallel printer
380H to 38FH SDLC
3A0H to 3AFH SDLC
3B0H to 3BBH MDA
3BCH to 3BFH Parallel printer
3C0H to 3CFH VGA EGA
3D0H to 3DFH CGA
3E8H to 3EFH Serial port
3F0H to 3F7H Floppy disk controller #1
3F8H to 3FFH Serial port

2-8 Setup and Installation

The Expansion Board Configuration for Keithley D AS-1700 Series dialog
in DriverLINX allows you to record the settings of your analog input
multiplexers and enable the expansion channels. Make sure that the
switch settings match the settings you define in DriverLINX. Refer to the

DriverLINX Appendix F: Configuration and Implementation
Notes—Keithley DAS-1700 manual.

After you have successfully installed the DAS-1700 Series board in your
computer, start Windows.

Run “Learn DriverLINX”

(LearnDL.exe)

from the DriverLINX program
group to tell DriverLINX how you configured your DAS-1700 Series
board and to verify that everything is properly installed and configured.

1. Start Windows as you normally would and select the Program

Manager window.

2. Either select the “Learn DriverLINX” icon created when you

installed DriverLINX or enter “<drive>:/DRVLNX/LEARNDL” in
the

Command Line

by selecting the

edit box. The Command Line edit box is activ ated

Run...

option. <drive> is the letter of the hard disk

drive where DriverLINX is installed.

3. Immediately after loading Learn DL, the Open DriverLINX DLL

dialog box appears. Select the name of the hardware–specific DLL
from the list for your DAS-1700 Series board. The name is an
abbreviation of the board’s model number.

4. From the main menu bar of Learn DL, select the

choose

Select...

.

Device

menu and

5. Select the Logical Device you wish to configure and then click on the

OK

button (return).

6. Again select the

Device

menu and then choose the

Configure...

option

to display the Device Configuration Dialog Box.

7. From the

Model

list, select the model name for your DAS-1700

Series board you are configuring.

8. If the value displayed in the

Address

edit box is not correct, type the
correct value into the box. You may enter the address in decimal or
hexadecimal using the c–notation for hex, (that is, 768 decimal =
0x300 hexadecimal).

Configuration of the DAS-1700 Board with DriverLINX 2-9

9. Choose the correct options for the

Counter/Timer Sections

by first clicking on the appropriate radio

Analog, Digital,

and

button in the middle of the dialog box and then completing the group
of dialog fields in the lower third of the dialog box. Be sure to click
on both the

Input

and

Output

radio buttons for the

Analog

and

Digital

groups to see all the dialog fields.

10. After you have made all your selections, save the configuration
parameters by clicking on the OK button. This will create or update
the configuration file, <device>.INI, in the Windows directory.

11. Repeat the preceding steps, starting at step 5, for each Logical Device
you wish to configure.

You can use DriverLINX to verify board operation.

1. To physically initialize the DAS-1700, select

Device/Initialize

from

the main menu in Learn DriverLINX.

2. The first time the DAS-1700 is initialized, or after a configuration
change, DriverLINX runs a diagnostic program to verify the
operation and accuracy of the configuration settings.

You are now ready to make I/O connections. Refer to Section 3 for
descriptions of common I/O accessories and connections for DAS-1700
Series boards.

2-10 Setup and Installation

Cabling and Wiring

This section discusses the following subjects:

●

Attaching Accessories

accessories to DAS-1700 Series boards.

●

Connecting Signals

Series boards.

●

Synchronizing the Start of Operations on Multiple Boards

describes how to synchronize the start of analog input operations on
multiple DAS-1700 Series boards.

Attaching Accessories

3

— describes how to attach supported

— describes how to wire signals to DAS-1700

—

The following sections describe how to attach accessories to DAS-1700
Series boards.

STA-1800U Screw Terminal Accessory

The STA-1800U screw terminal accessory contains the following
components:

●

Two 50-pin male connectors (J1 and J2). Use J1 for cabling to the
main I/O connector of DAS-1700 Series boards; use J2 for cabling to
a second STA-1800U.

●

53 labeled screw terminals for connections from sensor outputs and
test equipment.

Attaching Accessories 3-1

Four 26-pin male connectors (J4, J5, J6, and J7) for cabling to MB02

●

expansion backplanes.

●

One 37-pin male connector (J3) for cabling to SSH-8 accessories or
to an MB01 backplane.

Figure 3-1 shows the connector layout of an STA-1800U screw terminal
accessory.

J11

J7

J10

J6

J8

J9

J1

J2

J3

J4

J5

Figure 3-1. Connector Layout of an STA-1800U

3-2 Cabling and Wiring

To attach an STA-1800U to a DAS-1700 Series board, use a CDAS-2000
or SDAS-2000 cable. Connect one end of the cable to the main I/O
connector of the DAS-1700 Series board and the other end of the cable to
connector J1 of the STA-1800U, as shown in Figure 3-2.

CDAS-2000 or

DAS-1700

Series board

STA-1800U

J1

Figure 3-2. Attaching an STA-1800U to a DAS-1700 Series Board

SDAS-2000

cable

Attaching Accessories 3-3

Pin assignments for the main I/O connector of a DAS-1700 Series board
are shown in Figure 3-3.

(User Common Mode) U_CM MD - 01

Notes:

1

DAS-1701ST-DA, DAS-1702ST-DA, DAS-1702HR-DA,
DAS-1701AO, and DAS-1702AO boards only

2

DAS-1701ST-DA and DAS-1702ST-DA boards only

CH00 LO or CH08 HI - 02
CH01 LO or CH09 HI - 03
CH02 LO or CH10 HI - 04
CH03 LO or CH11 HI - 05
CH04 LO or CH12 HI - 06
CH05 LO or CH13 HI - 07
CH06 LO or CH14 HI - 08
CH07 LO or CH15 HI - 09

ODAC2 (Note 2) - 10
ODAC3 (Note 2) - 11

+15V - 12

±15V Return - 13

D GND - 14

DI 1 - 15
DI 3 - 16

DO 1 - 17

DO 3 - 18
DOSTB - 19
TGOUT - 20

MUX 03 - 21
MUX 05 - 22
MUX 07 - 23

+5V - 24

D GND - 25

26 - CH00 HI
27 - CH01 HI
28 - CH02 HI
29 - CH03 HI
30 - CH04 HI
31 - CH05 HI
32 - CH06 HI
33 - CH07 HI
34 - LL GND
35 - ODAC0 (Note 1)
36 - ODAC1 (Note 1)
37 - -15V
38 - ±15V Return
39 - GEXT
40 - DI 0
41 - DI 2
42 - DO 0
43 - DO 2
44 - XPCLK
45 - SSHO
46 - TGIN
47 - MUX 04
48 - MUX 06
49 - +5V
50 - D GND

Figure 3-3. Pin Assignments for the Main I/O Connector of a DAS-1700 Series Board

Pin assignments for connectors J1 and J2 of the STA-1800U are shown in
Figure 3-4.

3-4 Cabling and Wiring

(User Common Mode) U_CM MD - 01

Notes:

1

DAS-1701ST-DA, DAS-1702ST-DA, DAS-1702HR-DA,
DAS-1701AO, and DAS-1702AO boards only

2

DAS-1701ST-DA and DAS-1702ST-DA boards only

CH00 LO or CH08 HI - 03
CH01 LO or CH09 HI - 05
CH02 LO or CH10 HI - 07
CH03 LO or CH11 HI - 09
CH04 LO or CH12 HI - 11
CH05 LO or CH13 HI - 13
CH06 LO or CH14 HI - 15
CH07 LO or CH15 HI - 17

ODAC2 (Note 2) - 19
ODAC3 (Note 2) - 21

+15V - 23

±15V Return - 25

D GND - 27

DI 1 - 29

DI 3 - 31
DO 1 - 33
DO 3 - 35

DOSTB - 37

TGOUT - 39
MUX 03 - 41
MUX 05 - 43
MUX 07 - 45

+5V - 47

D GND - 49

02 - CH00 HI
04 - CH01 HI
06 - CH02 HI
08 - CH03 HI
10 - CH04 HI
12 - CH05 HI
14 - CH06 HI
16 - CH07 HI
18 - LL GND
20 - ODAC0 (Note 1)
22 - ODAC1 (Note 1)
24 - -15V
26 - ±15V Return
28 - GEXT
30 - DI 0
32 - DI 2
34 - DO 0
36 - DO 2
38 - XPCLK
40 - SSHO
42 - TGIN
44 - MUX 04
46 - MUX 06
48 - +5V
50 - D GND

Figure 3-4. Pin Assignments for Connectors J1 and J2 of the STA-1800U

Note that the screw terminals for the DAC (digital-to-analog converter)
outputs are labeled differently for Revisions 1 and 2 of the STA-1800U.
These differences are shown in Table 3-1.

Table 3-1. STA-1800U Labels for DAC Outputs

DAC Rev. 1 Label Rev. 2 Label

0 DAC0 OUT ODAC0
1 DAC1 OUT ODAC1
2 DAC0 IN ODAC2
3 DAC1 IN ODAC3

Attaching Accessories 3-5

STP-50 Screw Terminal Panel

To attach an STP-50 screw terminal panel to a DAS-1700 Series board,
use a CDAS-2000 or SDAS-2000 cable. Connect one end of the cable to
the main I/O connector of the DAS-1700 Series board and the other end
of the cable to the STP-50, as shown in Figure 3-5. Screw terminal
assignments for the STP-50 are shown in Figure 3-6.

DAS-1700 Series board

Figure 3-5. Attaching an STP-50 to a DAS-1700 Series Board

(User Common Mode) U_CM MD - 01

Notes:

1

DAS-1701ST-DA, DAS-1702ST-DA, DAS-1702HR-DA,
DAS-1701AO, and DAS-1702AO boards only

2

DAS-1701ST-DA and DAS-1702ST-DA boards only

CDAS-2000 or

SDAS-2000

CH00 HI - 02

CH00 LO or CH08 HI - 03

CH01 HI - 04

CH01 LO or CH09 HI - 05

CH02 HI - 06

CH02 LO or CH10 HI - 07

CH03 HI - 08

CH03 LO or CH11 HI - 09

CH04 HI - 10

CH04 LO or CH12 HI - 11

CH05 HI - 12

CH05 LO or CH13 HI - 13

CH06 HI - 14

CH06 LO or CH14 HI - 15

CH07 HI - 16

CH07 LO or CH15 HI - 17

LL GND - 18
ODAC2 (Note 2) - 19
ODAC0 (Note 1) - 20
ODAC3 (Note 2) - 21
ODAC1 (Note 1) - 22

+15 V - 23

−15 V - 24

±15 V Return - 25

STP-50

screw

terminal

panel

cable

26 - ±15 V Return
27 - D GND
28 - GEXT
29 - DI 1
30 - DI 0
31 - DI 3
32 - DI 2
33 - DO 1
34 - DO 0
35 - DO 3
36 - DO 2
37 - DOSTB
38 - XPCLK
39 - TGOUT
40 - SSHO
41 - MUX 03
42 - TGIN
43 - MUX 05
44 - MUX 04
45 - MUX 07
46 - MUX 06
47 - +5 V
48 - +5 V
49 - D GND
50 - D GND

Figure 3-6. Screw Terminal Assignments for the STP-50

3-6 Cabling and Wiring

SSH-8 Accessory

DAS-1700ST Series and DAS-1700AO Series boards can accept one or
two SSH-8 accessories. (DAS-1700HR Series boards do not support
SSH-8 accessories). You attach an SSH-8 to a DAS-1700ST Series or
DAS-1700AO Series board through an STA-1800U screw terminal
accessory. Note that attached SSH-8 accessories must be set as slaves.

To attach an SSH-8 to a STA-1800U, use a C-1800 cable, as shown in
Figure 3-7. Refer to the
SSH-8 accessories.

accessory

SSH-8

SSH-8 User’s Guide

DAS-1700ST Series or

DAS-1700AO Series

board

for more information about

CDAS-2000 or

SDAS-2000

cable

J1
J3

C-1800 cable

P1

STA-1800U

Figure 3-7. Attaching an SSH-8 to a DAS-1700ST or DAS-1700AO Series Board

Attaching Accessories 3-7

MB01 Backplane

A DAS-1700 Series board configured for single-ended inputs can accept
one MB01 backplane through an STA-1800U screw terminal accessory.
To attach an MB01 backplane to an STA-1800U, use a C16-MB1 cable,
as shown in Figure 3-8. Refer to the
information about MB01 backplanes and modules.

MB Series User’s Guide

STA-1800U

for more

DAS-1700 Series board

MB01

backplane

MBX
X

Figure 3-8. Attaching an MB01 Backplane to a DAS-1700 Series Board

MB02 Expansion Backplane

A DAS-1700 Series board configured for single-ended inputs and
working through multiple STA-1800U screw terminal accessories can
accept up to 16 MB02 expansion backplanes. Each STA-1800U contains
four connectors (J4 to J7) for connecting up to four MB02 expansion
backplanes. To attach MB02 expansion backplanes to an STA-1800U, use
C-2600 cables, as shown in Figure 3-9. Refer to the

Guide

for more information about MB02 backplanes and modules.

MBX
X

CDAS-2000 or

SDAS-2000

cable

#0#1#15

MBX
X

J1

C16-MB1 cable

MB Series User’s

J3

3-8 Cabling and Wiring

To J4 of the
STA-1800U

C-2600
cable

MB02

#0 #1 #15
MBXXMB

XX

MB
XX

To J5 of the
STA-1800U

To J6 of the
STA-1800U

To J7 of the
STA-1800U

C-2600
cable

C-2600
cable

C-2600
cable

#0 #1 #15

MBXXMB

XX

#0 #1 #15
MBXXMB

XX

#0 #1 #15

MBXXMB

XX

MB02

MB
XX

MB02

MB
XX

MB02

MB
XX

Y ou can connect

up to four MB02

expansion

backplanes to an

ST A-1800U

Figure 3-9. Attaching MB02 Expansion Backplanes to an STA-1800U

To attach additional MB02 expansion backplanes, daisy-chain additional
STA-1800U screw terminal accessories to the first STA-1800U using
CACC-2000 cables. Connect the J2 connector of one STA-1800U to the
J1 connector of the next STA-1800U, as shown in Figure 3-10.

Attaching Accessories 3-9

To next
STA-1800U

Set for CH 6

Set for CH 5

Set for CH 7

Set for CH 4

DAS-1700 Series board

CACC-2000

cables

STA-1800U

C-2600 cables

Set for CH 1

Set for CH 2

Set for CH 3

Set for CH 0

J2

STA-1800U

cable

SDAS-2000

CDAS-2000 or

J1

To Board 1of MB02 Group 2

To Board 3 of MB02 Group 2

To Board 2 of MB02 Group 2

To Board 4 of MB02 Group 2

To Board 4 of MB02 Group 1

To Board 1of MB02 Group 1

To Board 3 of MB02 Group 1

To Board 2 of MB02 Group 1

Figure 3-10. Daisy-Chaining STA-1800Us with Attached MB02s

The jumper pads beside connectors J4 to J7 on each STA-1800U screw
terminal accessory select the channels of the DAS-1700 Series board that
the attached MB02 expansion backplane is to use. On the first
STA-1800U, the jumpers assign connectors J4 to J7 to DAS-1700 Series
board channels 0 to 3, respectively (default settings), as shown in Figure
3-10. On the second STA-1800U, you must position the jumpers to assign
connectors J4 to J7 to channels 4 to 7, respectively, and so on. Refer to
Figure B-4 on page B-5 for a diagram of connectors J4 to J7 and their
associated jumper pads.

3-10 Cabling and Wiring

EXP-1800 Expansion Accessory

To attach an EXP-1800 expansion accessory to the main I/O connector of
a DAS-1700 Series board, use a CDAS-2000 or SDAS-2000 cable, as
shown in Figure 3-11. To connect additional EXP-1800s, use CAB-50
Series cables, as shown in Figure 3-11. Refer to the

Guide

for more information about EXP-1800 expansion accessories.

EXP-1800 User’s

DAS-1700 Series board

EXP-1800

CAB-50 or

CAB-50/1

cable

J6

EXP-1800

CAB-50 or

CAB-50/1

cable

cable

SDAS-2000

CDAS-2000 or

J7

Figure 3-11. Daisy-Chaining EXP-1800s

You can attach up to 16 EXP-1800 expansion accessories to a DAS-1700
Series board; however, some of the added EXP-1800s will require
external power. Each EXP-1800 contains screw terminals for attaching
external power, a receptacle for a DC/DC converter, and a switch for
changing between internal and external power.

Attaching Accessories 3-11

The accuracy of a DAS-1700HR Series board exceeds the

Note:

accuracy of an EXP-1800 expansion accessory. Data returned by a
DAS-1700HR Series board attached to an EXP-1800 using a gain of 1 is
appropriate; however, data returned by a DAS-1700HR Series board
attached to an EXP-1800 using a gain of 50 includes additional noise and
other information that may not be significant.

Connecting Signals

Caution:

T o a void electrical damage, turn po wer to the computer and an y

attached accessories OFF before wiring signals to the board.

Keep the following in mind when wiring signals to a DAS-1700 Series
board:

●

You wire your signal to a screw terminal on an accessory that is
connected to the board through the main I/O connector. Figure B-1 on
page B-2 lists the functions associated with each pin on the main I/O
connector.

DAS-1700 Series boards contain separate grounds for low-level

●

analog signals, ±15 V po wer return, and digital signals. Use an analog
ground (LL GND or U_CM MD, depending on the input
configuration) for analog signals; use a ±15 V return for analog
power; use a digital ground (DGND) for digital signals and the +5 V
power-supply return.

If you are using a differential input configuration, use LL GND for
analog ground. If you are using a single-ended input configuration,
you can use LL GND or U_CM MD for analog ground; refer to
page 7-6 for information on choosing between available analog
grounds.

When using a DAS-1701ST, DAS-1701ST-DA, or DAS-1701AO

●

board at a gain of 50 or 250, take the following precautions to avoid
analog noise and performance degradation:

– Operate the board in 8-channel differential mode. Using the

board in 16-channel single-ended mode at high gains introduces

3-12 Cabling and Wiring

enough ground-loop noise to produce large fluctuations in
readings.

– Minimize noise from crosstalk and induced-voltage pickup in the

flat cables and screw terminal accessories by using shielded
cable. Connect the shield to LL GND and the inner conductors to
CH LO and CH HI. CH LO and LL GND should have a DC
return (or connection) at some point; this return should be as
close to the signal source as possible. Induced noise from RF and
magnetic fields can easily exceed tens of microvolts, even on
1-foot or 2-foot cables; shielded cable eliminates this problem.

– Avoid bi-metallic junctions in the input circuitry. For example,

the kovar leads, used on reed relays, typically ha v e a thermal emf
to copper of 40

V/˚C. Thermals can introduce strange random

µ

variations caused by air currents and so on.

– Provide filtering using either hardware (resistors, capacitors, and

so on) or software. To provide software filtering, instead of
reading the channel once, read it 10 or more times in quick
succession and average the readings. If the noise is random and
gaussian, the noise will be reduced by the square-root of the
number of readings.

●

Do not mix your analog input signals with the AC line. An
inadvertent short between data and power lines can cause extensive
and costly damage to your computer for which the manufacturer may
not accept liability. To prevent this problem, use the following
precautions:

– Avoid direct connections to the AC line.
– Make sure all connections are tight and sound so that signal wires

are not likely to come loose and short to high voltages.

– Use isolation amplifiers and transformers where necessary.

Connecting Signals 3-13

Single-Ended Analog Input Signals

Figure 3-12 illustrates how to connect an analog input signal to channel n
on a DAS-1700 Series board configured for single-ended inputs.

Signal

source

+

−

Figure 3-12. Single-Ended Inputs (SIngle Channel)

Notes:

You specify the common-mode ground reference through

CHn HI

DAS-1700 Series board

LL GND or
U_CM MD

software. If you specify a user-defined common-mode ground reference,
use U_CM MD and make sure that the signal source is grounded. If you
specify a low-level analog ground reference, use LL GND if the signal
source is isolated; if the signal source is not isolated, make no connection.

It is recommended that you wire all unused channels to LL GND or
U_CM MD to prevent the input amplifiers from saturating and to ensure
the accuracy of your data.

3-14 Cabling and Wiring

Figure 3-13 illustrates how to connect analog input signals to channels 0
through n, where all channels are referred to the same user-defined
common-mode ground. Note that the fixed potential from signal common
to ground must be within the common-mode operating range (±10 V).

Signal

sources

−

Vin 0

−

Vin n

+

Fixed potential from signal

V

common to ground

−

+

+

CH0 HI

CHn HI

U_CM MD

Figure 3-13. Single-Ended Inputs (Multiple Channels)

Differential Analog Input Signals

Figure 3-14 illustrates three ways to connect an analog input signal to
channel n on a DAS-1700 Series board configured for differential inputs.

DAS-1700 Series board

Connecting Signals 3-15

Floating

signal

source

R

s

Where Rs > 100 Ω
Rb = 2000 R

+

-

R

s

R

b

b

CHn HI

CHn LO

LL GND

DAS-1700 Series board

Floating

signal

source

R

s

Where Rs < 100 Ω
Rb = 1000 R

R

v

R

s

+

DC

supply

+

-

s

Bridge

-

CHn HI

DAS-1700 Series board

R

b

CHn LO

LL GND

CHn HI

DAS-1700 Series board

CHn LO

LL GND

Figure 3-14. Differential Inputs

The upper two circuits of Figure 3-14 illustrate floating signal source
connections. (A floating signal source is a voltage source that has no
connection with earth ground; the signal is not referenced to the third wire
on a 3-wire AC line outlet.) Floating signal sources require the addition of
resistors to provide a bias current return.

3-16 Cabling and Wiring

You can determine the value of the bias return resistors (Rb) from the
value of the source resistance (Rs), using the following relationships:

●

When Rs is greater than 100 Ω, use the connections in the upper
circuit. The resistance of each of the two bias return resistors must
equal 2000 Rs.

●

When Rs is less than 100 Ω, use the connections in the middle circuit.
The resistance of the bias return resistor must be greater than 1000 Rs.

In the lower circuit of Figure 3-14, bias current return is inherently
provided by the source. The circuit requires no bias resistors. R
signal source resistance while Rv is the resistance required to balance the
bridge.

Avoiding a Ground Loop Problem

If your signal source is grounded, the signal-source ground and the
DAS-1700 Series board ground may not be at the same voltage level
because of the distances between equipment wiring and the building
wiring. In this situation, ground loop problems can occur if you tie the
two grounds together and the two grounds are not at the same potential.
The difference in potential is referred to as a
because it is normally common to both sides of a differential input (it
appears between each side and ground).

is the

s

common-mode voltage

(V

cm

)

The most effective way to avoid common-mode voltage errors for
single-ended inputs is to wire the inputs as shown in Figure 3-12, using
the U_CM MD input.

Since a differential input responds only to the difference in the signals at
its high and low inputs, its common-mode voltages cancel out and leave
only the signal. However, if your input connections create a ground loop,
you could see incorrect data readings resulting from the difference
between the signal source’s ground potential and the DAS-1700 Series
board’s ground.

Figure 3-15 shows the proper way to connect a differential input to a
grounded signal source. Make sure that CHn LO is connected to ground
at the signal source, not at the computer and make sure that you do not tie
the two grounds together.

Connecting Signals 3-17

+

Grounded

signal

source

Signal source

ground V

g 1

E

s

-

Figure 3-15. Avoiding a Ground Loop Problem

Analog Output Signals

Figure 3-16 illustrates how to connect a voltage output signal from D A C n
on a DAS-1701ST-DA, DAS-1702ST-DA, DAS-1702HR-DA,
DAS-1701AO, or DAS-1702AO board to your application.

CHn HI

CHn LO

E

s

DAS-1700 Series board

Do not connect CHn LO to
LL GND at the computer

ODACn

DAS-1701ST-DA,
DAS-1702ST-DA,

DAS-1702HR-DA,

DAS-1701AO, or

DAS-1702AO board

LL GND

667 Ω minimum

Figure 3-16. Voltage Output

3-18 Cabling and Wiring

Digital Signals

You can connect the following digital signals to a DAS-1700 Series
board:

● Digital input signal — Connect a digital input signal to the DI0, DI1,

DI2, or DI3 pin of the main I/O connector.

● Digital output signal — Connect a digital output signal to the DO0,

DO1, DO2, or DO3 pin of the main I/O connector.

● External pacer clock — Connect an external pacer clock to the

XPCLK pin of the line of the main I/O connector.

● External digital trigger — Connect an external digital trigger to the

TGIN pin of the main I/O connector.

● Hardware gate — Connect a hardware gate to the TGIN pin of the

main I/O connector.

● SSH output signal — Connect the SSH output signal to the SSHO

pin of the main I/O connector.

● Trigger/gate output signal — Connect the trigger/gate output signal

to the TGOUT pin of the main I/O connector.

● Strobe signal — Connect the strobe signal to the DOSTB pin of the

main I/O connector.

Make sure that all digital signals are TTL-level compatible. Use the
D GND pin as the return for all digital signals. Refer to Figure B-1 on
page B-2 for the location of each pin on the main I/O connector.

Connecting Signals 3-19

Synchronizing the Start of Operations on Multiple Boards

You can synchronize the start of analog input operations on up to three
DAS-1700 Series boards using trigger and gate signals from the main I/O
connector. All boards can run at the same conversion rate or each board
can run at a different conversion rate.

The internal A/D pacer clock is designed to be tightly coupled with
trigger and gate operations. After a board receives the trigger or gate
signal, conversions be gin within a defined period of time. If each board is
programmed for a different conversion rate, the first conversion on each
board occurs after this time period and subsequent conversions occur at
the programmed rate.

Figure 3-17 illustrates two ways to synchronize the start of analog input
operations on multiple boards. Both use the internal A/D pacer clock to
pace acquisitions.

Board 0
Rate a

Board 1
Rate b

Board 2
Rate c

a. Scheme 1

TGIN

TGIN

TGIN

Trigger

Board 0
Rate a

Board 1
Rate b

Board 2
Rate c

TGIN

TGOUT

TGIN

TGIN

b. Scheme 2

Figure 3-17. Synchronizing the Start of Operations on Multiple Boards

Trigger

(optional)

3-20 Cabling and Wiring

In scheme 1, you connect the trigger/gate inputs of the three boards
together and start the analog input operation when an external digital
trigger event occurs. A/D conversions on each board start 400 ±100 ns
from the time the active edge of the trigger signal is detected. All
conversions start within 100 ±100 ns of each other from board to board.
When using scheme 1, you can use the internal A/D pacer clock or an
external pacer clock.

In scheme 2, you start conversions either by an external digital trigger or
through software. The boards are connected in a master/slave
relationship; board 0 is the master, and boards 1 and 2 are the slaves.

If you use software to start A/D conversions for board 0 of scheme 2, the
board 0 pacer clock starts and triggers conversions in the slave boards.
However, board 0 conversions do not begin until after conversions begin
in the slave boards. The delay of board 0 conversions is caused by a
protection feature built into the register that creates software-triggered
conversions; the function of the protection feature is to prevent false
conversions.

If you use an external digital trigger for board 0 of scheme 2, the
trigger/gate output signal (TGOUT) from board 0 triggers conversions in
all three boards immediately. Note that TGOUT is an active, high-going
signal. Therefore, you must program the slave-board TGIN inputs for a
positive-edge trigger. Refer to page 7-30 for more information about the
TGOUT signal.

When using scheme 2, you must use the internal A/D pacer clock.

Connecting Signals 3-21

Testing the Board

This section describes how to use DriverLINX to test functions of
DAS-1700 Series boards.

DriverLINX Analog I/O Panel

The DriverLINX Analog I/O Panel is an application that demonstrates
analog input/output using DriverLINX. With the Analog I/O Panel you
can:

Analyze analog signals using the two-channel Oscilloscope.

●

●

Measure analog voltages using the Digital Volt Meter.

●

Generate Sine, Square and Triangle waves using the SST Signal
Generator.

4

●

Output DC Level voltages using the Level Control.

The Analog I/O Panel is useful for:

●

Testing the DAS-1700 DriverLINX installation and configuration.
Verifying signal inputs to your DAS-1700 board.

●

Sending test signals to external devices.

●

To access this DriverLINX Analog I/O Panel:

1. Start the Analog I/O P anel with the “AIO Panel” item on the Windo ws
start menu. Then perform the following steps:

2. Click the [...] button in the Driver Selection section.

3. Select the driver for your board using the

4. Click

DriverLINX Analog I/O Panel 4-1

OK.

Open DriverLINX

dialog.

5. Select the Logical Device you want to operate by dragging the pointer
in the Device Selection section. The Analog I/O Panel displays the
Scope, Meter, SST, and Level control tabs, depending on the
capabilities of your DAS-1700 board.

6. The Scope uses two analog input channels, referred to as ChA and
ChB. Drag the channel selectors in the AI Channel Mapping section
to map them to different channel numbers.

7. The SST Signal Generator uses two analog output channels, referred
to as ChA and ChB. Drag the channel selectors in the AO Channel
Mapping section to map them to different channel numbers.

You can now select the Scope, Meter, SST and Level Control tabs to
operate your DAS-1700 board.

Test Panel Application

Depending upon the DriverLINX drivers you have installed on your
system, you will have one or more of the following example applications:

●

Single–Value AI

for analog input

●

Single–Value AO
PIO Panel

●

CTM Test Bench

●

for analog output

for digital input and output

for counter/timer applications.

To access this DriverLINX Test Panel, select Test Panel with the “Test
Panel” item on the Windows start menu.

4-2 Testing the Board

Troubleshooting

This section contains the following information:

●

Problem Isolation

problems.

●

Identifying Symptoms and Possible Causes

symptoms and possible solutions for problems with DAS-1700 Series
boards.

●

Testing the Board and the Computer

whether the problem is in the computer or in the DAS-1700 Series
boards.

●

Testing the Accessory Slot and I/O Connections

determine whether the problem is in the accessory slot or in the I/O
connections.

●

Technical Support

for technical support.

— helps you use software tools to help isolate

— lists general

— helps you determine

— helps you

— describes how to contact Keithle y Instruments

5

Problem Isolation

If you encounter a problem with a DAS-1700 Series board, use the
instructions in this section to isolate the cause of the problem before
calling Keithley for technical support.

Using the DriverLINX Event Viewer

The DriverLINX Event Viewer displays the Windows system event log.
Applications and hardware drivers make entries in the system e v ent log to
assist in predicting and troubleshooting hardware and software problems.

Problem Isolation 5-1

DriverLINX uses the event log to report problems during driver loading
or unexpected system errors. The event log can assist in troubleshooting
resource conflicts and DriverLINX configuration errors. If you are having
trouble configuring or initializing a Logical Device, check the event log
for information from the DriverLINX driver.

Using the DriverLINX Event Viewer , you can vie w Driv erLINX ev ent log
entries under Windows 95/98 or Windows NT. DriverLINX event log
entries can help you or technical support troubleshoot data–acquisition
hardware and software problems.

Device Initialization Error Messages

During device initialization, DriverLINX performs a thorough test of all
possible subsystems on the DAS-1700 Series board as well as the
computer interface. If DriverLINX detects any problems or unexpected
responses, it reports an error message to help isolate the problem. The
device initialization error messages fall into three basic categories:

“Device not found” —

●

Board address does not match hardware
setting or conflicts with another board. Verify the board’s address
settings. Also, don’t confuse hexadecimal with decimal addresses in
the DriverLINX

●

“Invalid IRQ le vel”

Device Configure

or

“Invalid DMA le vel” —

dialog box.

not match hardware setting, conflicts with another board’ s IRQ/DMA
levels, or is dedicated to the computer’s internal functions (COM
port, disk drive controller, network adapter, etc.)

●

“Hardware does not match configuration” —

mode/range switch or jumper setting does not match selection(s)
made in the DriverLINX

Device Configuration

dialog box.

Identifying Symptoms and Possible Causes

Table 5-1 lists general symptoms and possible solutions for problems
with DAS-1700 Series boards.

Selected level does

Operating

5-2 Troubleshooting

Table 5-1. Troubleshooting Information

Symptom Possible Cause Possible Solution

Board does not
respond

Base address is unacceptable. Make sure that the base address

specified in the configuration file
matches the setting of the base address
switch on the board. Make sure that no
other system resource is using any of the
16 I/O locations beginning at the
specified base address (all boards) and
any of the 10 I/O locations beginning at
the specified base address plus 400h
(DAS-1700AO Series only). If
necessary, reconfigure the base address.
Refer to page 2-2 for instructions.

The interrupt level is
unacceptable.

The board configuration is
incorrect.

The board is incorrectly aligned
in the accessory slot.

The board is damaged. Contact Keithley for technical support;

Make sure no other system resource is
using the interrupt level specified in the
configuration file. If necessary, reset the
interrupt level.

Check the settings in the configuration
file.

Check the board for proper seating.

refer to page 5-6.

Intermittent
operation

Identifying Symptoms and Possible Causes 5-3

The I/O bus speed is in excess of
8 MHz.

Vibrations or loose connections
exist.

The board is overheating. Check environmental and ambient

Electrical noise exists. Provide better shielding or reroute

Reduce I/O bus speed to a maximum of
8 MHz (to change the I/O bus speed, run
BIOS setup). See your computer
documentation for instructions on
running BIOS setup.

Cushion source of vibration and tighten
connections.

temperature. See the documentation for
your computer.

unshielded wiring.

Table 5-1. Troubleshooting Information (cont.)

Symptom Possible Cause Possible Solution

Data appears to be
invalid

Computer does not
boot

The I/O bus speed is in excess of
8 MHz.

An open connection exists. Check wiring to screw terminal.
Another system resource is using

the specified base address.

Transducer is not connected to the
channel being read.

Board is set for a single-ended
input configuration while the
transducer is set for a differential
input configuration, or vice versa.

Board not seated properly. Check the installation of the board.
The base address setting of the

board conflicts with that of
another system resource.

Reduce I/O bus speed to a maximum of
8 MHz (to change the I/O bus speed, run
BIOS setup). See the documentation for
your computer for instructions on
running BIOS setup.

Reconfigure the base address of the
board; refer to page 2-2 for information.
Check the base address assignments of
other system resources and reconfigure,
if necessary.

Check the transducer connections.

Check transducer specifications and
board configuration.

Check the base address settings of your
system resources; each address must be
unique.

The power supply of the
computer is too small to handle
all the system resources.

System lockup A timing error occurred. Press

Check the needs of all system resources
and obtain a larger power supply.

Ctrl + Break.

If you cannot identify the problem using the information in T able 5-1,
refer to the next section to determine whether the problem is in the
computer or in the DAS-1700 Series board.

5-4 Troubleshooting

Testing the Board and the Computer

To determine whether the problem is in the computer or in the DAS-1700
Series board, perform the following steps:

Caution:

your board and/or computer.

1. Turn the power to the computer OFF, and remove power connections

2. While keeping connections to accessories intact, unplug the cable to

3. Remove the board from the computer and visually check for damage.

4. With the board out of the computer, check the computer for proper

If you have another DAS-1700 Series board that you know is functional,
refer to the next section to determine whether the problem is in the
accessory slot or in the I/O connections. If you do not have another board,
refer to page 5-6 for information on how to contact Keithle y for technical
support.

Removing a board with the power ON can cause damage to

to the computer.

the main I/O connector of the DAS-1700 Series board.

If the board is obviously damaged, refer to page 5-6 for information
on returning the board.

operation. Power up the computer and perform any necessary
diagnostics.

Testing the Accessory Slot and I/O Connections

To determine whether the problem is in the accessory slot or in the I/O
connections, perform the following steps:

1. Turn the power to the computer OFF, and remove power connections
to the computer.

2. Install a DAS-1700 Series board that you know is functional. Do not
make any I/O connections.

Identifying Symptoms and Possible Causes 5-5

3. Turn computer power ON and check operation with the functional
board in place. This test checks the accessory slot. If you are using
more than one board, use the functional board to test the other slots as
well.

4. If the accessory slots are functional, use the functional board to check
the I/O connections by reconnecting and checking the operation of
the I/O connections, one at a time.

5. If operation fails for an I/O connection, check the individual inputs
one at a time for shorts and opens.

6. If operation is normal, the problem is in one of the DAS-1700 Series
boards originally in the computer. If you were using more than one
board, try each board, one at a time, to determine which is faulty.

7. If you cannot isolate the problem, refer to the next section for
instructions on getting technical support.

Technical Support

Before returning any equipment for repair, call Keithley for technical
support at:

1-888-KEITHLEY

Monday - Friday, 8:00 a.m. - 5:00 p.m., Eastern Time

An applications engineer will help you diagnose and resolve your
problem over the telephone.

5-6 Troubleshooting

Please make sure that you have the follo wing information av ailable before
you call:

DAS-1700 Series
board configuration

Computer

Operating system
Software package

Model
Serial #
Revision code
Base address setting
Interrupt level setting
Number of channels
Input configuration
Range type
DMA chan(s)
Number of SSH-8s
Number of EXPs

Manufacturer
CPU type
Clock speed (MHz)
KB of RAM
Video system
BIOS type

Windows version ___________________
Name

Serial #
Version
Invoice/Order #

___________________
___________________
___________________
___________________
___________________
___________________
single-ended, differential
unipolar, bipolar
___________________
___________________
___________________

___________________
___________________
___________________
___________________
___________________
___________________

___________________
___________________
___________________
___________________

Compiler
(if applicable)

Accessories

Technical Support 5-7

Language
Manufacturer
Version

Type
Type
Type
Type
Type
Type
Type
Type

___________________
___________________
___________________

___________________
___________________
___________________
___________________
___________________
___________________
___________________
___________________

If a telephone resolution is not possible, the applications engineer will
issue you a Return Material Authorization (RMA) number and ask you to
return the equipment. Include the RMA number with any documentation
regarding the equipment.

When returning equipment for repair, include the following information:

Your name, address, and telephone number.

●

The invoice or order number and date of equipment purchase.

●

●

A description of the problem or its symptoms.

●

The RMA number on the

outside

of the package.

Repackage the equipment, using the original anti-static wrapping, if
possible, and handle it with ground protection. Ship the equipment to:

ATTN.: RMA# _______
Repair Department
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139-1891

Telephone 1-888-KEITHLEY
FAX [phone]

Note:

If you are submitting your equipment for repair under warranty,

you must include the invoice number and date of purchase.

To enable Keithley to respond as quickly as possible, you must include
the RMA number on the outside of the package.

5-8 Troubleshooting

Calibrating the Board

This section contains the following information:

●

Equipment Requirements

calibrate a DAS-1700 Series board.

●

Potentiometers and Test Points

potentiometers and test points needed to calibrate a DAS-1700 Series
board.

●

Calibration Utility

DriverLINX Calibration Utility.

— describes how to use the DAS-1700 Series

— lists the equipment you need to

— shows the location of the

6

Note:

initially calibrated at the factory and should not require calibration when
shipped. It is recommended that you check and, if necessary, readjust the
calibration of your DAS-1700 Series board and EXP-1800 expansion
accessories every six months.

DAS-1700 Series boards and EXP expansion accessories are

6-1

Equipment Requirements

You need the following equipment to calibrate a DAS-1700 Series board:

For DAS-1700ST Series and DAS-1700AO Series boards, a digital

●

voltmeter accurate to 6 1/2 digits, such as a Keithley Instruments
Model 196

For DAS-1700HR Series boards, a digital voltmeter accurate to 7 1/2

●

digits, such as a Keithley Instruments Model 2001
An adjustable ±10 V voltage calibrator, such as a Keithley

●

Instruments Model 236
An STA-1800U with a CDAS-2000 or SDAS-2000 cable, an STP-50

●

with a CDAS-2000 or SDAS-2000 cable, or a user-designed interface

●

The appropriate number of CDAS-2000 or SDAS-2000 cables for
EXP-1800 accessories, if used

Potentiometers and Test Points

The locations of the potentiometers and test points needed to calibrate
DAS-1700 Series boards are shown in the following figures:

Board Figure

DAS-1701ST
DAS-1702ST Figure 6-1 on page 6-3

DAS-1702HR Figure 6-2 on page 6-3
DAS-1701ST-DA

DAS-1702ST-DA Figure 6-3 on page 6-4
DAS-1702HR-DA Figure 6-4 on page 6-4
DAS-1701AO

DAS-1702AO Figure 6-5 on page 6-5

6-2 Calibrating the Board

TP5

DGND

Gain

TP4

ADCSTAT

VOUT

TP1

Offset

TP2

TP5

R12

DGND

Bipolar Offset

TP3

ADCSTB

Unipolar

Figure 6-1. DAS-1701ST and DAS-1702ST

AGND

VOUT

Bipolar Offset

Unipolar Offset

R3

R4

TP1

ADBUSY

R10

Unipolar Gain

Bipolar Gain

TP3

R11

TP2

TP4

SAMP

AGND

RTI Offset

R20R16R13

RTI Offset

R5

Figure 6-2. DAS-1702HR

Potentiometers and Test Points 6-3

DAC2 Offset

DAC2 Gain

DAC3 Offset

DAC3 Gain

R1R2R3R4R5

DAC0 Offset

DAC0 Gain

DAC1 Offset

DAC1 Gain

R12

R8

R6

R7

TP5

Bipolar Offset

TP3

ADCSTAT

ADCSTB

DGND

Gain

TP1

TP4

Offset

TP2

AGND

RTI Offset

R20R16R13

Unipolar

VOUT

Figure 6-3. DAS-1701ST-DA and DAS-1702ST-DA

TP2

VOUT

AGND

Bipolar Offset

Unipolar Offset

RTI Offset

R5R4R3R11

R31

DAC0 Offset

DAC0 Gain

R35

R32

TP1

TP4

ADBUSY

DAC1 Offset

DAC1 Gain

R10

R36

SAMPLE

Bipolar Gain

Unipolar Gain

TP3

Figure 6-4. DAS-1702HR-DA

6-4 Calibrating the Board

DAC 0
Gain

DAC 0
Offset

DAC 1
Gain

DAC 1
Offset

A/D
Bipolar
Offset

A/D
Gain

VOUT

Unipolar
Offset

AGND

RTI Offset

R42 R44R43 R46

TP6

DAC 0 Out

DGND,

ADCSTB, and

ADCSTAT

TP7

DAC 1 Out

TP5

TP3

TP1

TP4

Figure 6-5. DAS-1701AO and DAS-1720AO

DriverLINX Calibration Utility

DriverLINX Calibration Utility will guide you through the calibration
procedure. Before calibration, specify the following parameters in the
setup panel to get the correct instructions:

TP2 R41R40R38R45

●

Logical Device —

●

Accessory —

Board’s device number, model and address.

Connection method used to connect the board to the

calibration stimulus.

Shorted channel —

●

Voltage Channel —

●

Input channel to be “shorted” high to low

Input channel to use to apply the various

calibration voltage levels

Calibration range —

●

Note:

If you are using EXP-1800 expansion accessories, it is

Input range to be calibrated.

recommended that you connect and calibrate one EXP-1800 at a time.

DriverLINX Calibration Utility 6-5

Functional Description

This section describes the following:

●

Block Diagrams

boards.

●

Analog Input Features

features of DAS-1700 Series boards.

●

Analog Output Features

output features of DAS-1700 Series boards.

●

Digital I/O Features

features of DAS-1700 Series boards.

●

Interrupts

Series boards.

— functional block diagrams of DAS-1700 Series

— a detailed description of the analog input

— a detailed description of the analog

— a detailed description of the digital I/O

— a description of the use of interrupts on DAS-1700

7

●

Power

boards.

— a description of the power features of DAS-1700 Series

Block Diagrams

This section contains block diagrams for the following boards:

Boards Page Number

DAS-1701ST, DAS-1702ST, and DAS-1702HR Figure 7-1 on page 7-2
DAS-1701ST-DA and DAS-1702ST-DA Figure 7-2 on page 7-3
DAS-1702HR-DA Figure 7-3 on page 7-4
DAS-1701AO and DAS-1702AO Figure 7-4 on page 7-5

Block Diagrams 7-1

Chan. 0/0

Analog

Inputs

or

16 S.E.

Chan. 7/15

8 Diff.

GEXT

MUX [7:4]

Inst.

Amp.

Select

Unipolar/Bipolar

Sampling

ADC

8 or 16

Channel

Input MUX

Gain

Select

Trigger/Gate and

Burst Mode Control

Diff./S.E.

QRAM

1 K x 16

FIFO

Select

256 x 11

Chan.-Gain

Control

Address

Local Control Bus

Status

Control and

QRAM

Registers

+15 V

DC/DC

-15 V

Interrupt and

DMA Control

+5 V

Converter

ISA AT Bus (16-bit)

Address

Decode &

Prescaler

Note: The sampling ADC is 12-bit for DAS-1701ST and

DAS-1702ST boards and 16-bit for DAS-1702HR boards.

TGOUT

SSHO

XPCLK

TGIN

16-Bit

Counter 0

16-Bit

Counter 1

16-Bit

Counter 2

82C54

Timer/Counter

Buffer

Xtal Osc.

DI [3:0]

Latch

DOSTB

DO [3:0]

Figure 7-1. Block Diagram of DAS-1701ST, DAS-1702ST, and DAS-1702HR Board

7-2 Functional Description

-15 V

+15 V

DC/DC

Converter

TGOUT

SSHO

+5 V

XPCLK

TGIN

16-Bit

Counter 0

FIFO

1 K x 16

16-Bit

Counter 1

16-Bit

Counter 2

82C54

Timer/Counter

Local Control Bus

DI [3:0]

Buffer

Xtal Osc.

Prescaler

DO [3:0]

DOSTB

Latch

Address

Decode &

Select

12-Bit

Sampling ADC

Select

Inst.

Amp.

Unipolar/Bipolar

Trigger/Gate and

Burst Mode Control

Gain

Select

QRAM

Control

Address

QRAM

256 x 11

Chan.-Gain

Status

Registers

Control and

Interrupt and

DMA Control

ISA AT Bus (16-bit)

Figure 7-2. Block Diagram of DAS-1701ST-DA and DAS-1702ST-DA Board

8 or 16

Channel

Chan. 0/0

Analog

Inputs

Input MUX

8 Diff.

or

16 S.E.

Chan. 7/15

Diff./S.E.

Select

GEXT

MUX [7:4]

DAC 0 - 12 Bits

DAC 1 - 12 Bits

ODAC 1

ODAC 0

DAC 2 - 12 Bits

DAC 3 - 12 Bits

ODAC 2

ODAC 3

Block Diagrams 7-3

Chan. 0/0

Analog

Inputs

or

16 S.E.

Chan. 7/15

8 Diff.

GEXT

MUX [7:4]

ODAC 0

ODAC 1

8 or 16

Inst.

Amp.

Select

Unipolar/Bipolar

16-Bit

Sampling ADC

+15 V

DC/DC

Converter

-15 V

Channel

Input MUX

+5 V

Diff./S.E.

Gain

Select

Trigger/Gate and

Burst Mode Control

256 x 11

QRAM

1 K x 16

FIFO

Chan.-Gain

QRAM

Address

Local Control Bus

Control and

Status

DAC 0 - 16 Bits

Interrupt and

DMA Control

Prescaler

DAC 1 - 16 Bits

Select

Address

Decode &

ISA AT Bus (16-bit)

Figure 7-3. Block Diagram of DAS-1702HR-DA Board

16-Bit

Counter 2

82C54

Timer/Counter

Buffer

Xtal Osc.

DI [3:0]

Latch

DOSTB

DO [3:0]

SSHO

TGOUT

TGIN

XPCLK

16-Bit

Counter 0

16-Bit

Counter 1

7-4 Functional Description

15 V Ret.

+15 V

−15 V

SSHI

TGOUT

SSHO

TGIN

XPCLK

DI [3:0]

DOSTB

DO [3:0]

+5V

5V Ret.

−15 V

+15 V

DC/DC

Converter

1 K x 16

Sampling

82C54 Counter/Timer

+5 V

A/D FIFO

12-Bit ADC

Buffe

• 32-Bit A/D Counter

• About-Trigger Counter

• ADC Timing and Control

• Interrupt Control

• ADC DMA Control

• Burst Mode Control

r

Internal Bus

Buffe

• DAC Timing and Control

• 16-Bit D/A Counter

• DAC DMA Control

r

Latch

Buffer

• Recycle Mode Control

2048 x 16

D/A FIFO

+5V

D GND

ISA AT Bus

Gain

Uni./Bip. Select

CH 0/0

Inst.

Amp.

CM_MD

Select

8 or 16

Analog

Inputs: 8

Select

Channel

Input MUX

Diff. or

16 S.E.

Diff./S.E.

Select

CH 7/15

256 x 11

Chan.-Gain

LL GND

MUX [7:4]

U_CM_MD

GEXT

12-Bit

Sample

Hold

Amplifier

DAC 0

DAC 0

Range Select

OUT

12-Bit

DAC 1

Sample

DAC 1

Amplifier

OUT

Range Select

Hold

Figure 7-4. Block Diagram of DAS-1701AO and DAS-1702AO Board

Block Diagrams 7-5

Analog Input Features

The analog input section of DAS-1700 Series boards multiplexes all the
active input channels (up to 16 single-ended or eight dif ferential) do wn to
a single, sampling ADC (analog-to-digital converter). Sampling
resolution of the ADC is 12 bits (one part in 4096) for DAS-1700ST and
DAS-1700AO Series boards and 16 bits (one part in 65,536) for the
DAS-1700HR Series boards. The analog input features are described in
the following sections.

Channels

This section describes the input configurations supported, channel
expansion, gains and input ranges supported, and channel selection.

Input Configuration

Through software, you configure DAS-1700 Series boards for either 16
single-ended or eight differential onboard analog input channels. The
differences between a single-ended and a differential input configuration
are described in the following sections.

Single-Ended Input Configuration

A single-ended input configuration is appropriate if you are measuring
high-level signals where noise is not significant, if the source of the input
signal is close to the board, and if all input signals are referred to the same
common ground.

You can use either a low-level analog ground or a user-defined common
mode as the common-mode ground reference. (You specify the ground
reference through software.) If you use a low-level analog ground, the
low side of the instrumentation amplifier is connected to the LL GND pin;
if you use a user-defined common mode, the low side of the amplifier is
connected to the U_CM MD pin.

7-6 Functional Description

The user-defined common mode can eliminate ground loops in the
system. Since the U_CM MD pin connects to the high input impedance of
the instrumentation amplifier, the signal contains no power-supply return
current.

The user-defined common mode is also useful when signals are referred
to a voltage that is not ground or when the output range does not include
ground. For example, a common way to perform 4 to 20 mA current
monitoring is to connect a loop with a 250

resistor to ground; the

Ω

resistor yields a 1 to 5 V output in this current range. This method works
but uses only 80% of the input range when connected to a 0 to 5 V range.
A better way is to use a 312.5

Ω

resistor and refer all measurements to

1.25 V. The actual output voltage then ranges from 1.25 V to 6.25 V;

however, since the amplifier low side is connected to 1.25 V, the
measurement range is now a span of 5 V, making the entire input range
available and increasing resolution of the measurements by 20%.

It is recommended that you always use the user-defined common mode.
Use analog ground only if you want the convenience of not having to
connect a separate wire for low input.

Differential Input Configuration

A differential input configuration is appropriate if you are measuring
low-level signals (less than 100 mV) where noise is a significant part of
the signal or if common-mode voltages exist between the voltage source
and the computer’s chassis ground.

Channel Expansion

If you require additional analog input channels, you can use up to 16
EXP-1800 expansion accessories or up to 16 MB02 expansion
backplanes to increase the number of available channels to 256. Refer to
page 3-11 for more information on using EXP-1800 expansion
accessories; refer to page 3-8 for more information on using MB02
expansion backplanes.

Analog Input Features 7-7

DAS-1700 Series boards use the following control lines to determine the
channel sequence and gain settings for expansion channels:

●

Multiplexer control lines MUX 4 to MUX 7

— MUX 4 to MUX 7
determine the order in which channels on EXP-1800 expansion
accessories and MB02 expansion backplanes are sampled.

●

External gain control line GEXT

— GEXT sets the gain of each

channel on a EXP-1800 expansion accessory to 1 or 50.

Notes:

backplanes, channels on the DAS-1700 Series board must be configured
as single-ended.

If you are using a DAS-1700HR Series board with an EXP-1800
expansion accessory, keep in mind that the accuracy of the DAS-1700HR
Series board exceeds the accuracy of the EXP-1800; therefore, data
returned by a DAS-1700HR Series board attached to an EXP-1800 using
a gain of 50 includes additional noise and other information that may not
be significant.

Gains and Ranges

Each channel on a DAS-1700 Series board can measure analog input
signals in one of eight unipolar and bipolar ranges. A unipolar signal is
always positive (0 to 5 V, for example), while a bipolar signal can swing
up and down between positive and negative peak values (±5 V, for
example). DAS-1700 Series boards use positive magnitude to represent
unipolar input signals and 2’s complement to represent bipolar input
signals.

Through software, you specify the input range type (unipolar or bipolar)
of the board and the gain of each channel on the board. Table 7-1 lists the
gains supported by DAS-1700 Series boards and the analog input range
for each gain. Note that for a given range with the same peak voltage, the
unipolar input range type doubles the resolution of the ADC.

If you use EXP-1800 expansion accessories or MB02 expansion

7-8 Functional Description

Board

Table 7-1. Analog Input Ranges

Analog Input Range

Location of
Channel Gain

Bipolar Unipolar

DAS-1701ST
DAS-1701ST-DA
DAS-1701AO

DAS-1702ST
DAS-1702ST-DA
DAS-1702HR
DAS-1702HR-DA
DAS-1702AO

1

Either onboard or
on an EXP-1800
using a gain of 1

On an EXP-1800
using a gain of 50

Either onboard or
on an EXP-1800
using a gain of 1

1

On an EXP-1800
using a gain of 50

1 ±5 V 0 to 5 V
5 ±1 V 0 to 1 V
50 ±100 mV 0 to 100 mV
250 ±20 mV 0 to 20 mV
50 ±0.1 V 0 to 0.1 V
250 ±20 mV 0 to 20 mV
2500 ±2 mV 0 to 2 mV

12.5k ±0.4 mV 0 to 0.4 mV
1 ±10 V 0 to 10 V
2 ±5 V 0 to 5 V
4 ±2.5 V 0 to 2.5 V
8 ±1.25 V 0 to 1.25 V
50 ±0.2 V 0 to 0.2 V
100 ±0.1 V 0 to 0.1 V
200 ±50 mV 0 to 50 mV
400 ±25 mV 0 to 25 mV

Notes

1

If you use these boards with an EXP-1800 using a gain of 50, the data returned includes

additional noise and other information that may not be significant.

Channel Selection

DAS-1700 Series boards can acquire data from a single analog input
channel, from a group of consecutive analog input channels using
automatic channel scanning, or from a group of analog input channels
using the hardware channel-gain queue. These methods of channel
selection are described in the following sections.

Analog Input Features 7-9

Selecting a Single Channel

You use software to specify a single channel and initiate a conversion.

Selecting Channels Using Automatic Channel Scanning

You use software to specify the first and last channels in a range of
consecutive channels. The channels are sampled in order from first to last;
the hardware automatically increments the analog input multiplexer
address shortly after the start of each conversion. When the last address is
reached, the multiplexer returns to the start address and the channels are
sampled again. For example, assume that the start channel is 4, the stop
channel is 7, and you want to acquire five samples. Your program reads
data first from channel 4, then from channels 5, 6, and 7, and finally from
channel 4 again.

The start channel can be higher than the stop channel. For example,
assume that you are not using any expansion accessories, the board uses a
differential configuration, the start channel is 7, the stop channel is 2, and
you want to acquire five samples. Your program reads data first from
channel 7, then from channels 0, 1, and 2, and finally from channel 7
again.

When using automatic channel scanning, all consecutive channels have
the same gain (analog input range).

Selecting Channels Using the Channel-Gain Queue

You can use the hardware channel-gain queue to acquire samples from up
to 256 logical channels. Through software, you specify the channels you
want to sample, the order in which you want to sample them, and the gain
for each channel.

You can set up the channels in the channel-gain queue either in
consecutive order or in nonconsecutive order. You can also specify the
same channel more than once. The channels are sampled in order from
the first channel in the queue to the last channel in the queue.

Refer to Table 7-1 on page 7-9 for a list of the analog input ranges
supported by DAS-1700 Series boards and the gains associated with each
range.

7-10 Functional Description

Note that the throughput is likely to drop if you group channels with
varying gains in sequence. The drop occurs because the channels with
low-lev el inputs (magnitude of 100 mV or less) are slower than those with
high-level inputs and because the channels with low-level inputs must
drive out the residual signals left by the high-le vel inputs. The best way to
maximize throughput is to use a combination of appropriate channel
grouping and external signal conditioning. When using the channel-gain
queue, consider the following suggestions:

●

Keep all channels configured for a particular range together, even if
you have to arrange the channels out of sequence.

●

If your application requires high-speed scanning of low-lev el signals,
use external signal conditioning to amplify the signal to ±5 V or 0 to
5 V. This increases total system throughput and reduces noise.

●

If you are not using all the channel-gain entries (256), make a
particular channel-gain entry twice to allow for settling time. In this
case, ignore the results of the first entry.

●

If you are measuring steady-state signals, do not use the channel-gain
queue. Instead, use software to step through the channels and perform
single-channel acquisitions. For example, using software-controlled
single-channel acquisitions to acquire 1000 samples on channel 0 at a
gain of 1 and then 2000 samples on channel 1 at a gain of 250
virtually eliminates interference. This method is best for measuring
steady-state signals even if all the channels are at the same gain.

●

If you are measuring low-level signals (±20 mV, 0 to 20 mV,
±100 mV, or 0 to 100 mV ranges) with a DAS-1701ST or
DAS-1701AO board, reduce the effects of noise by sampling the
same channel multiple times and then averaging the readings from
each channel. In addition, use low-level transducers with signal
conditioning and use the ±20 mV, 0 to 20 mV, ±100 mV, and 0 to
100 mV ranges with a differential input configuration.

Table 7-2 lists the maximum throughput for channel-to-channel sampling
with a fixed analog input range (0.024% maximum error).

Analog Input Features 7-11

Table 7-2. Maximum Throughput with Fixed Range

Board

DAS-1701ST
DAS-1701ST-DA
DAS-1701AO

DAS-1702ST
DAS-1702ST-DA
DAS-1702AO

Range
Type

Bipolar ±5 V 166.67 ksamples/s

Unipolar 0 to 5 V 166.67 ksamples/s

Bipolar ±10 V 166.67 ksamples/s

Unipolar 0 to 10 V 166.67 ksamples/s

Range

±1 V 166.67 ksamples/s
±100 mV 166.67 ksamples/s
±20 mV 60 ksamples/s

0 to 1 V 166.67 ksamples/s
0 to 100 mV 166.67 ksamples/s
0 to 20 mV 60 ksamples/s

±5 V 166.67 ksamples/s
±2.5 V 166.67 ksamples/s
±1.25 V 166.67 ksamples/s

0 to 5 V 166.67 ksamples/s

Maximum
Throughput

0 to 2.5 V 166.67 ksamples/s
0 to 1.25 V 166.67 ksamples/s

DAS-1702HR
DAS-1702HR-DA

7-12 Functional Description

Bipolar ±10 V 50 ksamples/s

±5 V 50 ksamples/s
±2.5 V 50 ksamples/s
±1.25 V 50 ksamples/s

Unipolar 0 to 10 V 50 ksamples/s

0 to 5 V 50 ksamples/s
0 to 2.5 V 50 ksamples/s
0 to 1.25 V 50 ksamples/s

Note that the throughputs are based on driving the input with an ideal
voltage source. The output impedance and dri ve of the source are far more
critical when making large gain changes between two channels whose
inputs are at opposite extremes of their input ranges, as when a signal
near

−

be able to drive both the capacitance of the cable and the RC
(resistor-capacitor) product of the multiplexer resistance and the output
capacitance of the multiplexer and board. The multiplexer is typically
about 360 Ω (1 kΩ maximum) in series with 90 pF output capacitance.

When changing the analog input range between channels, the maximum
throughput for channel-to-channel sampling is the lower of the
throughputs for the two channels (with less than 1 LSB of error for the
DAS-1700ST Series and DAS-1700AO Series and less than 2 LSB of
error for the DAS-1700HR Series). For example, on a DAS-1701AO
board, if you are switching from a channel configured with a ±5 V input
range to a channel configured with a ±100 mV input range, the maximum
throughput is 166.67 ksamples/s; if you are switching from a channel
configured with a ±5 V input range to a channel configured with a
±20 mV input range, the maximum throughput is 60 ksamples/s.

Conversion Modes

20 mV is measured after a signal at near +5 V. The source needs to

The conversion mode determines how the board regulates the timing of
conversions when you are acquiring multiple samples from a single
channel or from a group of multiple channels (known as a scan). Through
software, you can specify paced mode, burst mode, or burst mode with
SSH. These conversion modes are illustrated in Figure 7-5 and described
in the following sections.

Analog Input Features 7-13

Pacer Clock

Paced Mode

Burst Mode

Burst Mode with SSH

Burst Mode Conversion Clock

Paced Mode

Burst Mode

CH4

CH4

CH5

CH4Hold

CH6

CH

CH7

CH6

CH5

CH4 CH5

CH4

HoldCH7

CH6

CH5

CH7

CH6

CH7

Figure 7-5. Conversion Modes

Use paced mode if you want to accurately control the period between
conversions of individual channels in a scan. The conversion rate equals
the pacer clock rate. The sample rate, which is the rate at which a single
channel is sampled, is the pacer clock rate divided by the number of
channels you are sampling.

Use burst mode if you want to accurately control both the period between
conversions of individual channels in a scan and the period between
conversions of the entire scan. Each pulse from the pacer clock starts a
scan of channels. The conversion rate equals the rate of the burst mode
conversion clock. The sample rate, which is the rate at which a single
channel is sampled, equals the pacer clock rate.

The sample rate (pacer clock rate) should be no more than the burst mode
conversion clock rate divided by the number of channels in the burst.

7-14 Functional Description

Burst Mode with SSH

Use burst mode with SSH if you want to accurately control both the
period between conversions of individual channels in a scan and the
period between conversions of the entire scan and if you want to
simultaneously sample all channels in a scan. Each pulse from the pacer
clock starts a simultaneous scan of all channels. The conversion rate
equals the rate of the burst mode conversion clock. The sample rate,
which is the rate at which a single channel is sampled, equals the pacer
clock rate.

One extra tick of the burst mode conversion clock is required to sample
and hold the values. Therefore, the sample rate (pacer clock rate) can be
no more than the burst mode conversion rate divided by the sum of one
plus the number of channels in the burst.

You cannot use burst mode with SSH for DAS-1700HR Series boards.

For information on the signal interface between DAS-1700ST Series and
DAS-1700AO Series boards and SSH hardware, refer to page 7-32.

Clock Sources

DAS-1700 Series boards provide two clocks: a pacer clock and a burst
mode conversion clock. In paced mode, you use only a pacer clock, as
shown in Figure 7-5 on page 7-14. In burst mode and burst mode with
SSH, you use both a pacer clock and the burst mode conversion clock, as
shown in Figure 7-5 on page 7-14. These clock sources are described in
the following sections.

Pacer Clock

In paced mode, the pacer clock determines the period between the
conversion of one channel and the con v ersion of the next channel. In b urst
mode and burst mode with SSH, the pacer clock determines the period
between the conversions of one scan and the conversions of the next scan.
Through software, you select either the internal A/D pacer clock or an
external pacer clock. These pacer clocks are described in the following
sections.

Analog Input Features 7-15

The rate at which the computer can reliably read data from a

Note:

DAS-1700 Series board depends on a number of factors, including your
computer, the operating system/environment, whether you are acquiring
samples from multiple channels, the gains of the channels, whether you
are using expansion accessories, and software issues. Make sure that the
pacer clock does not initiate conversions too fast.

Internal A/D Pacer Clock

The internal A/D pacer clock uses two cascaded counters of the onboard
82C54 counter/timer and a crystal-controlled 5 MHz time base. The
maximum available rate is 166.67 ksamples/s for DAS-1700ST and
DAS-1700AO Series boards and 50 ksamples/s for DAS-1700HR Series
boards; the minimum available rate is 0.0012 samples/s. When not used to
pace analog input operations, you can use the internal A/D pacer clock to
pace other events, such as digital I/O operations.

External Pacer Clock

The external pacer clock source is an externally applied TTL-compatible
signal attached to the XPCLK pin (pin 44 of the board’s main I/O
connector or pin 38 of STA-1800U connectors J1 and J2). The polarity
(active edge) of the external pacer clock is software-selectable.

An external pacer clock is useful if you want to pace at rates not av ailable
with the internal A/D pacer clock, if you w ant to pace at une v en interv als,
or if you want to pace on the basis of an external event. By attaching the
same external pacer clock to the XPCLK pins of multiple boards, you can
synchronize all the boards to the external pacer clock.

Burst Mode Conversion Clock

In burst mode and burst mode with SSH, the burst mode conversion clock
determines the period between the conversion of one channel in a scan
and the conversion of the next channel in the scan. (The burst mode
conversion clock is not used for paced mode.)

The maximum allowable rate is 166.67 ksamples/s for DAS-1700ST and
DAS-1700AO Series boards and 50 ksamples/s for DAS-1700HR Series
boards; the minimum available rate is 15.625 ksamples/s.

7-16 Functional Description

Triggers

Trigger Sources

A trigger is an event that occurs based on a specified set of conditions. An
operation must have a start trigger to determine when acquisitions start. In
addition, you can use an optional second trigger, the about trigger, to
determine when acquisitions stop.

The following sections describe the supported trigger sources and the
ways to acquire data using triggers.

The start trigger can be a software trigger or an external digital trigger.
The about trigger, if used, is always an external digital trigger.

Note:

trigger. However, you can program an analog start trigger through
software, using one of the analog input channels as the trigger channel.
The DAS-1700 Series Function Call Driver provides functions for an
analog trigger; refer to the

Guide

The software trigger and external digital trigger are described in the
following sections.

Software T rigger

A software trigger event occurs when you start the analog input operation
(the computer issues a write to allow conversions). The point at which
conversions be gin depends on the pacer clock; refer to page 7-15 for more
information. Note that the delay between the point at which you start the
analog input operation and the point at which the internal A/D pacer clock
starts is less than 1 µs.

DAS-1700 Series boards do not provide a hardware-based analog

DAS-1700 Series Function Call Driver User’s

for more information.

Analog Input Features 7-17

External Digital Trigger

An external digital trigger event occurs when the DAS-1700 Series board
detects either a negative edge or a positi ve edge at the TGIN pin (pin 46 of
the board’s main I/O connector or pin 42 of STA-1800U connectors J1
and J2). The trigger signal is TTL-compatible and the polarity (active
edge) is software-selectable.

The point at which conversions begin depends on the pacer clock, as
follows:

●

Internal A/D pacer clock

— The 82C54 counter/timer is idle until
the trigger event occurs. Within 400 ns, the first conversion begins.
Subsequent conversions are synchronized to the internal A/D pacer
clock.

External pacer clock

●

— Conversions are armed when the trigger
event occurs; conversions begin with the next active edge of the
external pacer clock and continue with each subsequent active edge.

Figure 7-6 illustrates how conversions are initiated when using an
external digital trigger.

7-18 Functional Description

Trigger event occurs

External digital trigger
(negative edge)

Conversions begin
when using an
external pacer clock
(negative edge)

External pacer
clock

Internal A/D
pacer clock

(idle state)

count

count

count

Conversions begin
when using an
internal A/D pacer clock

Figure 7-6. Initiating Conversions with an External Digital Trigger

count

The about trigger is always an external digital trigger. If you specify an
about trigger, the operation stops when a specified number of samples has
been acquired after the external digital trigger event.

Trigger Acquisition

The ways you can acquire data using triggers are described in the
following sections.

Post-Trigger Acquisition

Use post-trigger acquisition in applications where you want to collect
data after a specific trigger event. You specify a start trigger to determine
when the operation starts. The operation stops either when the specified
number of samples has been acquired or through a software command.

Analog Input Features 7-19

Pre-Trigger Acquisition

Use pre-trigger acquisition in applications where you want to collect data
before a specific trigger event. You specify a start trigger and an about
trigger. The start trigger determines when the operation starts. The
operation stops when the about-trigger event occurs. Pre-trigger
acquisition is available only when you use the DMA resources of the
board.

About-Trigger Acquisition

Use about-trigger acquisition in applications where you want to collect
data both before and after a specific trigger event. You specify a start
trigger and an about trigger. The start trigger determines when the
operation starts. The operation stops after a specified number of samples
has been acquired after the about-trigger event occurs. About-trigger
acquisition is available only when you use the DMA resources of the
board.

Hardware Gate

A hardware gate is an externally applied digital signal that determines
whether conversions occur. You connect the gate signal to the TGIN pin
(pin 46 of the board’s main I/O connector or pin 42 of STA-1800U
connectors J1 and J2).

If you specify a positive gate, conversions occur only if the signal to
TGIN is high; if the signal to TGIN is low, conversions are inhibited. If
you specify a negative gate, conversions occur only if the signal to TGIN
is low; if the signal to TGIN is high, conversions are inhibited. The gate
signal is TTL-compatible and the polarity of the hardware gate is
software-selectable.

7-20 Functional Description

The way conv ersions are synchronized depends on whether you are using
the internal A/D pacer clock or an external pacer clock, as follows:

●

Internal A/D pacer clock

— The 82C54 counter/timer stops
counting when the gate signal goes inactive. When the gate signal
goes active, the 82C54 is reloaded with its initial count value and
starts counting again; therefore, conversions are synchronized to the
gate signal.

Hardware gate
(positive polarity)

External pacer
clock
(negative edge)

Internal A/D
pacer clock

External pacer clock

●

— The signal from the external pacer clock
continues uninterrupted while the gate signal is inactive; therefore,
conversions are synchronized to the external pacer clock.

Figure 7-7 illustrates the use of a hardware gate.

Gate active;
conversions occur

1st conversion

Gate inactive;
conversions do not occur

2nd conversion

No conversion

Gate active

3rd conversion

1st conversion

3rd conversion

2nd conversion

4th conversion

Figure 7-7. Hardware Gate

Analog Input Features 7-21

Data T ransfer

DAS-1700 Series boards contain a 1024-word A/D FIFO. The result of
each A/D conversion is automatically stored in the FIFO. Y ou can transfer
data from the A/D FIFO to computer memory using either interrupts or
the DMA resources of the board, as described in the following sections.

Using Interrupts

You can program the board to generate an interrupt anytime the A/D FIFO
contains data (FIFO Not Empty) or after the A/D FIFO accumulates 512
A/D samples (FIFO Half Full). An interrupt service routine can then
transfer data from the A/D FIFO to computer memory while the FIFO
continues to fill. Refer to page 7-33 for more information about interrupts.

The interrupt level (3, 5, 7, 10, 11, or 15) is software-selectable. Refer to
“AI IRQ” on page C-4.

Unpredictable interrupt latencies in Windows can make maximum board
speeds unachievable; therefore, it is recommended that you use
single-channel or dual-channel DMA instead of interrupts, if possible.

Using DMA Resources

You can use the DMA controller to bypass the CPU and transfer data
directly from a DAS-1700 Series board to computer memory. The ability
to run independent of the CPU and at high-transfer rates makes DMA an
attractive method for transferring data in data acquisition systems.

DAS-1700 Series boards use DMA channel 5, 6, or 7 to perform
single-channel DMA transfers or DMA channel pairs 5 and 6, 6 and 7, or
7 and 5 to perform dual-channel DMA transfers. The DMA channel(s) are
software-selectable.

7-22 Functional Description

Each DMA channel can transfer up to 65,536 samples before it has to be
reprogrammed with a new memory address. When more than 65,536
samples are required by an application, the A/D FIFO automatically
stores the samples while the DMA channel is being reprogrammed for
another address. In most situations, the A/D FIFO allows you to acquire
large amounts of gap-free data into multiple buffers at up to maximum
board speed using a single DMA channel. However, if possible, you
should use dual-channel DMA to acquire data reliably at maximum board
speeds.

Analog Output Features

The following boards contain analog output circuitry:

●

DAS-1701ST-DA and DAS-1702ST-DA

●

DAS-1702HR-DA

●

DAS-1701AO and DAS-1702AO

The analog output features of these board are described in the following
sections.

DAS-1701ST-DA and DAS-1702ST-DA Boards

DAS-1701ST-DA and DAS-1702ST-DA boards contain four 12-bit
digital-to-analog converters (DACs). Each DAC has a fixed v oltage range
of ±10 V and powers up to 0 V at reset. Data coding is 2’s complement.
The four DACs have a capacitive load drive up to 100 µF and an output
current drive of up to ±5 mA.

You can use the internal A/D pacer clock to pace the analog output
operation if no analog input operation is in progress or if the analog input
operation is paced by an external pacer clock.

Note: You cannot use the DMA resources of DAS-1701ST-DA and

DAS-1702ST-DA boards to perform an analog output operation. In
addition, you cannot use an external trigger or an external pacer clock to
perform an analog output operation.

Analog Output Features 7-23

DAS-1702HR-DA Boards

DAS-1702HR-DA boards contain two 16-bit DACs. Each DAC has a
fixed voltage range of ±10 V and po wers up to 0 V at reset. Data coding is
2’s complement. The tw o D ACs have a capacitive load drive up to 100 µF
and an output current drive of up to ±5 mA (short-circuit current is about
25 mA).

You can use the internal A/D pacer clock to pace the analog output
operation if no analog input operation is in progress or if the analog input
operation is paced by an external pacer clock.

Note: Y ou cannot use the DMA resources of D AS-1702HR-D A boards to

perform an analog output operation. In addition, you cannot use an
external trigger or an external pacer clock to perform an analog output
operation.

DAS-1701AO and DAS-1702AO Boards

DAS-1701AO and DAS-1702AO boards contain two 12-bit DACs with
bipolar outputs. Each DAC is deglitched (a glitch is a transient that can
occur during certain types of voltage changes). The DACs power up to
0 V at reset.

The analog output features of DAS-1701AO and DAS-1702AO boards
are described in the following sections.

Output Ranges

Each DA C can ha v e a bipolar output range of ±5 V or ±10 V. The range is
software-selectable.

7-24 Functional Description

Pacer Clock

The pacer clock determines the rate at which the board writes new values
from the D/A FIFO to the DACs. Through software, you select either the
internal D/A pacer clock or an external pacer clock. You can also use the
internal A/D pacer clock or the burst mode conversion clock to
synchronize D/A conversions with A/D conversions. The pacer clocks are
described in the following sections.

Note: The rate at which the board can reliably write new values to the

DACs depends on a number of factors, including your computer, the
operating system/environment, the settling time of the DACs, the way
data is transferred to the board, and software issues.

Internal D/A Pacer Clock

The internal D/A pacer clock consists of a 16-bit counter with an optional
divide-by-ten prescaler driven by a 5 MHz crystal oscillator. The
maximum available rate is 200 ksamples/s; the minimum a vailable rate is

7.63 samples/s.

External Pacer Clock

The external pacer clock is an externally applied TTL-compatible signal
attached to the XPCLK pin (pin 44 of the board’s main I/O connector or
pin 38 of STA-1800U connectors J1 and J2). Note that an external pacer
clock for an analog input operation also uses the XPCLK pin. The active
edge of the external pacer clock is software-selectable.

An external clock is useful if you want to pace at rates not available with
the internal D/A pacer clock, if you want to pace at uneven interv als, or if
you want to pace on the basis of an external event. By attaching the same
external pacer clock to the XPCLK pins of multiple boards, you can
synchronize all the boards to the external pacer clock.

Analog Output Features 7-25

Triggers

Clock Used for an Analog Input Operation

If you are using one of the onboard clocks (either the internal A/D pacer
clock or the burst mode conversion clock) to pace an analog input
operation, you can use the clock that paces the analog input operation to
also determine the update rate for an analog output operation. Using the
same clock to pace both D/A and A/D conversions allows you to perform
tightly coupled stimulus-response operations at rates of up to

166.67 ksamples/s.

Note: You cannot synchronize an analog output operation to an analog

input operation that is being paced by an external pacer clock.

A trigger is an event that occurs based on a specified set of conditions.
The trigger event determines when updates of the analog output channels
begin and can be a software trigger or an external digital trigger, as
described in the following sections.

Note: DAS-1701AO and DAS-1702AO boards do not provide a

hardware-based analog trigger . Howe ver, you can program an analog start
trigger through software, using one of the analog input channels as the
trigger channel. The DAS-1700 Series Function Call Driver provides
functions for an analog trigger; refer to the DAS-1700 Series Function
Call Driver User’s Guide for more information.

Software T rigger

A software trigger event occurs when you start the analog output
operation (the computer issues a write to allow con v ersions). The point at
which conversions begin depends on the pacer clock; refer to page 7-25
for more information. Note that the delay between the point at which you
start the analog output operation and the point at which the internal D/A
pacer clock starts is about 1 µs.

7-26 Functional Description

Hardware Gate

External Digital Trigger

An external digital trigger event occurs when the DAS-1701AO or
DAS-1702AO board detects either a negative edge or a positive edge at
the TGIN pin (pin 46 of the board’s main I/O connector or pin 42 of
STA-1800U connectors J1 and J2). Note that an external digital trigger
for an analog input operation also uses the TGIN pin. The trigger signal is
TTL-compatible and the polarity (active edge) is software-selectable.

Conversions begin about 400 ns after the active edge of the external
digital trigger if you are using the internal D/A pacer clock or on the next
active edge of an external pacer clock. Refer to page 7-25 for more
information about pacer clocks.

If you are using an external digital trigger and you are using the D/A
FIFO to transfer data from the computer to the board (no more than 2048
values), you can use retrigger mode to start generating the waveform
stored in the D/A FIFO from the beginning each time the external digital
trigger event occurs. This allows you to synchronize the generation of a
waveform to an external digital trigger event.

A hardware gate is an externally applied digital signal that determines
whether conversions occur. You connect the gate signal to the TGIN pin
(pin 46 of the board’s main I/O connector or pin 42 of STA-1800U
connectors J1 and J2).

If you specify a positive gate, conversions occur only if the signal to
TGIN is high; if the signal to TGIN is low, conversions are inhibited. If
you specify a negative gate, conversions occur only if the signal to TGIN
is low; if the signal to TGIN is high, conversions are inhibited. Note that
the hardware gate for an analog input operation also uses the TGIN pin.
The gate signal is TTL-compatible and the polarity of the hardware gate
is software-selectable.

When using the internal D/A pacer clock, D/A conversions begin about
400 ns after the gate signal becomes active and terminate when the gate
signal becomes inactive. When using an external pacer clock, D/A
conversions begin on the next active clock edge after the gate signal
becomes active and terminate when the gate signal becomes inactive.

Analog Output Features 7-27

Data T ransfer

DAS-1701AO and DAS-1702AO boards contain a 2048-word D/A FIFO
to store analog output values. You can transfer data from computer
memory to the D/A FIFO using either interrupts or the DMA resources of
the board. The analog output values are then written to the D A Cs, at a rate
determined by the pacer clock.

If the output waveform you want to generate from a DAC is repetiti ve and
contains 2048 values or fewer, you can use recycle mode to continuously
generate the waveform.

The following sections contain more information on using interrupts,
using the DMA resources of the board, and using recycle mode.

Using Interrupts

You can program the board to generate an interrupt if the D/A FIFO is no
longer full of data (FIFO Not Full) or if the FIFO contains fewer than
1025 values (FIFO Not Half Full). An interrupt service routine can then
transfer data from computer memory to the D/A FIFO while the FIFO
continues to write values to the DACs. Refer to page 7-33 for more
information about interrupts.

The interrupt level (3, 5, 7, 10, 11, or 15) is software selectable. Refer to
“AI IRQ” on page C-4.

Using DMA Resources

You can use the DMA controller to bypass the CPU and transfer data
directly from computer memory to the D/A FIFO.

DAS-1700 Series boards use DMA channel 5, 6, or 7 to perform
single-channel DMA transfers. The DMA channel is software-selectable.
Refer to “AI DMA 1, AO DMA 1” on page C-4 for information on
specifying the DMA channel. (Note that you cannot perform
dual-channel DMA transfers for analog output operations.)

7-28 Functional Description

Using Recycle Mode

If you use a waveform of between 2 and 2048 values (all the values fit in
the D/A FIFO), you can use recycle mode to continuously generate the
waveform. The analog output values are transferred to the D/A FIFO once
(using either interrupts or the DMA resources of the board) and then are
continuously written to the DACs directly from the D/A FIFO. Recycle
mode is the fastest way to transfer data because it does not require the use
of the computer bus.

Digital I/O Features

DAS-1700 Series boards contain four digital input lines (DI0 to DI3) and
four digital output lines (DO0 to DO3). Logic 1 on a digital I/O line
indicates that the input/output is high (greater than 2.0 V); logic 0 on a
digital I/O line indicates that the input/output is low (less than 0.8 V).

The digital input signals are TTL-compatible. The input signals are
provided with 10 k
appear high (logic 1) with no signal connected. DAS-1700 Series boards
provide a latch strobe for digital output signals; refer to page 7-30 for
information.

Ω pull-up resistors to +5 V; therefore, the inputs

You can use the internal A/D pacer clock to pace the digital I/O operation
if no analog input operation is in progress or if the analog input operation
is paced by an external pacer clock.

Note: You cannot use the DMA resources of DAS-1700 Series boards to

perform a digital I/O operation. In addition, you cannot use an external
trigger or an external pacer clock to perform a digital I/O operation.

Digital Control Signals

The following sections describe the digital control signals provided on
DAS-1700 Series boards.

Digital I/O Features 7-29

Strobe Signal

300 ns strobe

DOSTB

DO[3:0] Data

DAS-1700 Series boards provide a strobe signal DOSTB (pin 19 of the
board’s main I/O connector or pin 37 of STA-1800U connectors J1 and
J2) for the purpose of strobing data through the digital output lines and
latching the data into a register in external equipment. DAS-1700 Series
boards use the positive edge of the strobe to strobe data out; ho we ver, you
must use the negative edge to strobe data into other equipment because
the negative edge provides a 300 ns lag to allow for delays. Data is valid
until the next strobe, as shown in Figure 7-8.

Strobe

Figure 7-8. Timing Relationship between Data from DO0 to DO3

and Latch Strobe DOSTB

Trigger/Gate Output Signal

If you are using the internal A/D pacer clock to pace an analog input
operation, you can use the trigger/gate output signal TGOUT (pin 20 of
the board’s main I/O connector or pin 39 of STA-1800U connectors J1
and J2) to synchronize the start of analog input operations on other
DAS-1700 Series boards or to act as a trigger or gate for user-defined
events, as follows:

● When using the TGIN pin as an external digital trigger, TGOUT

behaves as shown in Figure 7-9a. Note that TGOUT does not
retrigger and cannot be used with about-trigger acquisitions. Note
also that a delay of about 200 ns occurs between the active edge of
TGIN and the starting edge of TGOUT.

7-30 Functional Description

● When using the TGIN pin as a hardware gate, TGOUT behaves as

shown in Figure 7-9b. Note that a delay of about 200 ns occurs
between the active edge of TGIN and the starting edge of TGOUT.

● When using a software trigger or when the hardware gate is disabled

(TGIN pin is not used), TGOUT behaves as shown in Figure 7-9c.
Note that the delay between the point at which software enables
conversions and the starting edge of TGOUT is less than 1 µs.

Note: Y ou cannot use TGOUT when an external pacer clock is pacing the

analog input operation.

TGIN

TGOUT

TGIN

TGOUT

TGOUT

200 ns typical

a. TGIN as an External Digital Trigger

200 ns typical

b. TGIN as a Hardware Gate

Software enables
conversions

< 1 µs

c. Software Trigger/Gate Disabled

Software disables
conversions

Figure 7-9. Timing for the TGOUT Signal

Remains active until
conversions are
disabled by software

Digital Control Signals 7-31