Keithley DAS-4300 Series User manual

DAS-4300 Series
USER’S GUIDE

DAS-4300 Series User’s Guide
Revision A - June 1995
Part Number: 94520

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

Keithley MetraByte Division
Keithley Instruments, Inc.
440 Myles Standish Blvd. Taunton, MA 02780
Telephone: [phone]
●
FAX: [phone]
The information contained in this manual is believed to be accurate and reliable. However, Keithley
Instruments, Inc., assumes no responsibility for its use or 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 Keithley Instruments, Inc.
KEITHLEY INSTRUMENTS, INC., SHALL NOT BE LIABLE FORANY SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES RELATED TO THE USE OF THIS PRODUCT. THIS
PRODUCT IS NOT DESIGNED WITH COMPONENTS OF A LEVEL OF RELIABILITY
SUITABLE FOR USE IN LIFE SUPPORT OR CRITICAL APPLICATIONS.
Refer to your Keithley Instruments license agreement for specific warranty and liability information.
MetraByte, Visual Test Extensions, and VTX are trademarks of Keithley Instruments, Inc.All other
brand and product names are trademarks or registered trademarks of their respective companies.
© Copyright Keithley Instruments, Inc., 1995.
All rights reserved. Reproduction or adaptation of any part of this documentation beyond that permitted
by Section 117 of the 1976 United States Copyright Act without permission of the Copyright owner is
unlawful.

vii
Preface
The DAS-4300 Series User’s Guide provides the information needed to
install and use the DAS-4301/8K high-speed analog input board.
The manual is intended for data acquisition system designers, engineers,
technicians, scientists, and other users responsible for setting up and
installing DAS-4301/8K boards. It is assumed that users are familiar with
data acquisition principles, with their computer, and with their particular
application.
The DAS-4300 Series User’s Guide is organized as follows:
●
Chapter 1 provides an overview of the features of the DAS-4301/8K
board, including a description of supported software and accessories.
●
Chapter 2 provides a technical description of the features of the
DAS-4301/8K board.
●
Chapter 3 describes how to unpack, set up, and install a
DAS-4301/8K board.
●
Chapter 4 describes how to use the scope and test program to test the
functions of the DAS-4301/8K board.
●
Chapter 5 provides troubleshooting information.
●
Appendix A lists the specifications for DAS-4301/8K boards.
●
Appendix B describes the Keithley Memory Manager.
●
Appendix C presents bandwidth charts for the supported input ranges.
An index completes this manual.

viii
Note:
Not all features of the DAS-4301/8K board are currently supported
by all software packages. Refer to the documentation provided with your
software package to determine which features are supported.

Table of Contents
iii
Preface
1 Overview
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Supporting Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
2
Functional Description
Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
Input Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
Onboard Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
Host Computer Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
I/O Address Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
Memory Address Space . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
Pacer Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
Internal Pacer Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
External Pacer Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8
Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
Trigger Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
Internal Trigger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
External Analog Trigger. . . . . . . . . . . . . . . . . . . . . . . . . .2-10
External Digital Trigger . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Trigger Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
Post-Trigger Acquisition . . . . . . . . . . . . . . . . . . . . . . . . .2-12
About-Trigger Acquisition . . . . . . . . . . . . . . . . . . . . . . . .2-13
Equivalent Time Sampling (ETS) . . . . . . . . . . . . . . . . . . . . . . .2-14
Random Interleave Sampling (RIS). . . . . . . . . . . . . . . . . . . . . .2-18
3 Setup and Installation
Unpacking the Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Installing the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Installing the DAS-4300 Series Standard Software Package .3-2

iv
Installing the ASO-4300 Software Package . . . . . . . . . . . . . .3-3
DOS Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Windows Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Configuring the Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Creating a Configuration File . . . . . . . . . . . . . . . . . . . . . . . . .3-8
Setting Jumpers on the Board . . . . . . . . . . . . . . . . . . . . . . . .3-10
Setting the Base I/O Address . . . . . . . . . . . . . . . . . . . . . .3-12
Setting the Memory Address . . . . . . . . . . . . . . . . . . . . . .3-14
Setting the Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
Acquiring Data from Channel B or
Calibrating the Board . . . . . . . . . . . . . . . . . . . . . . . . . . .3-16
Selecting AC or DC Coupling . . . . . . . . . . . . . . . . . . . . .3-17
Setting the Input Impedance of Ch A Signal . . . . . . . . . .3-17
Setting the Input Impedance of the
Analog Trigger Input Signal. . . . . . . . . . . . . . . . . . . . . .3-18
Setting the 50
Ω
Termination Resistor for the
Clock Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-18
Setting the 50
Ω
Termination Resistor for the
Trigger Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
Setting the 100
Ω
Pull-Up to +5 V for the
Trigger Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-20
Setting Grounds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-20
Installing the Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-21
Initializing the Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22
4
Scope andTest Program
Control Keys for D4300.EXE . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Scope and Test Program Menus. . . . . . . . . . . . . . . . . . . . . . . . . .4-4
A/D Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Display Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Options Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
EEPROM Menus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
DAS-4301/8K Board Calibration. . . . . . . . . . . . . . . . . . . . . . . .4-10
Parameter Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10
Waveform Data File Format. . . . . . . . . . . . . . . . . . . . . . . . . . . .4-11
5
Troubleshooting
Identifying Symptoms and Possible Causes . . . . . . . . . . . . . . . .5-1
Testing Board and Host Computer. . . . . . . . . . . . . . . . . . . . . . . .5-3
Testing Accessory Slot and I/O Connections. . . . . . . . . . . . . . . .5-3
Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

v
A
Specifications
B Keithley Memory Manager
Installing and Setting Up the KMM. . . . . . . . . . . . . . . . . . . . . . B-2
Using KMMSETUP.EXE . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Using a Text Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Removing the KMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
C
Bandwidth Charts for InputVoltage Ranges
Index
List of Figures
Figure 2-1. Block Diagram of the DAS-4301/8K . . . . . . . . . .2-2
Figure 2-2. Host Computer Memory Address Space . . . . . . . .2-6
Figure 2-3. Equivalent Time Sampling (ETS) . . . . . . . . . . . .2-15
Figure 2-4. ETS Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17
Figure 2-5. Random Interleave Sampling. . . . . . . . . . . . . . . .2-19
Figure 3-1. Jumper Placement on DAS-4301/8K Board . . . .3-11
Figure 3-2. Analog Input Circuitry. . . . . . . . . . . . . . . . . . . . .3-17
Figure 3-3. Clock I/O and Trigger I/O Circuitry . . . . . . . . . .3-19
Figure C-1. ±0.2 V Input Range (Gain Code 0) . . . . . . . . . . . C-1
Figure C-2. ±0.25 V Input Range (Gain Code 1) . . . . . . . . . . C-2
Figure C-3. ±0.5 V Input Range (Gain Code 2) . . . . . . . . . . . C-2
Figure C-4. ±1 V Input Range (Gain Code 3). . . . . . . . . . . . . C-3
Figure C-5. ±0.125 V Input Range (Gain Code 4) . . . . . . . . . C-3
Figure C-6. ±0.15625 V Input Range (Gain Code 5) . . . . . . . C-4
Figure C-7. ±0.3125 V Input Range (Gain Code 6) . . . . . . . . C-4
Figure C-8. ±0.625 V Input Range (Gain Code 7) . . . . . . . . . C-5
Figure C-9. ±0.1 V Input Range (Gain Code 8) . . . . . . . . . . . C-5
Figure C-10. ±0.125 V Input Range (Gain Code 9) . . . . . . . . . C-6
Figure C-11. ±0.25 V Input Range (Gain Code 10) . . . . . . . . . C-6
Figure C-12. ±0.5 V Input Range (Gain Code 11) . . . . . . . . . . C-7
Figure C-13. ±0.025 V Input Range (Gain Code 12) . . . . . . . . C-7
Figure C-14. ±0.03125 V Input Range (Gain Code 13) . . . . . . C-8
Figure C-15. ±0.0625 V Input Range (Gain Code 14) . . . . . . . C-8
Figure C-16. ±0.125 V Input Range (Gain Code 15) . . . . . . . . C-9

vi
List ofTables
Table 2-1. Analog Input Ranges . . . . . . . . . . . . . . . . . . . . . . .2-4
Table 2-2. Available Conversion Rates Using Internal Clock 2-8
Table 3-1. Configuring DAS-4301/8K Boards . . . . . . . . . . . .3-6
Table 3-2. Base I/O Address . . . . . . . . . . . . . . . . . . . . . . . . .3-12
Table 3-3. Memory Address . . . . . . . . . . . . . . . . . . . . . . . . .3-14
Table 3-4. Interrupt Selection . . . . . . . . . . . . . . . . . . . . . . . .3-16
Table 3-5. Grounds on the DAS-4301/8K Board . . . . . . . . .3-20
Table 4-1. Control Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Table 4-2. Suffixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Table 4-3. A/D Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Table 4-4. Display Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Table 4-5. Options Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
Table 4-6. Configure EEPROM Menu . . . . . . . . . . . . . . . . . .4-9
Table 4-7. Waveform Data File Format . . . . . . . . . . . . . . . .4-11
Table 5-1. Troubleshooting Information. . . . . . . . . . . . . . . . .5-1
Table A-1. DAS-4301/8K Specifications . . . . . . . . . . . . . . . A-1

Table 2-1. Analog Input Ranges . . . . . . . . . . . . . . . . . . . . . . .2-4
Table 2-2. Available Conversion Rates Using Internal Clock 2-8
Table 3-1. Configuring DAS-4301/8K Boards . . . . . . . . . . . .3-6
Table 3-2. Base I/O Address . . . . . . . . . . . . . . . . . . . . . . . . .3-12
Table 3-3. Memory Address . . . . . . . . . . . . . . . . . . . . . . . . .3-14
Table 3-4. Interrupt Selection . . . . . . . . . . . . . . . . . . . . . . . .3-16
Table 3-5. Grounds on the DAS-4301/8K Board . . . . . . . . .3-20
Table 4-1. Control Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Table 4-2. Suffixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Table 4-3. A/D Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Table 4-4. Display Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Table 4-5. Options Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
Table 4-6. Configure EEPROM Menu . . . . . . . . . . . . . . . . . .4-9
Table 4-7. Waveform Data File Format . . . . . . . . . . . . . . . .4-11
Table 5-1. Troubleshooting Information. . . . . . . . . . . . . . . . .5-1
Table A-1. DAS-4301/8K Specifications . . . . . . . . . . . . . . . A-1

Figure 2-1. Block Diagram of the DAS-4301/8K . . . . . . . . . .2-2
Figure 2-2. Host Computer Memory Address Space . . . . . . . .2-6
Figure 2-3. Equivalent Time Sampling (ETS) . . . . . . . . . . . .2-15
Figure 2-4. ETS Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17
Figure 2-5. Random Interleave Sampling. . . . . . . . . . . . . . . .2-19
Figure 3-1. Jumper Placement on DAS-4301/8K Board . . . .3-11
Figure 3-2. Analog Input Circuitry. . . . . . . . . . . . . . . . . . . . .3-17
Figure 3-3. Clock I/O and Trigger I/O Circuitry . . . . . . . . . .3-19
Figure C-1. ±0.2 V Input Range (Gain Code 0) . . . . . . . . . . . C-1
Figure C-2. ±0.25 V Input Range (Gain Code 1) . . . . . . . . . . C-2
Figure C-3. ±0.5 V Input Range (Gain Code 2) . . . . . . . . . . . C-2
Figure C-4. ±1 V Input Range (Gain Code 3). . . . . . . . . . . . . C-3
Figure C-5. ±0.125 V Input Range (Gain Code 4) . . . . . . . . . C-3
Figure C-6. ±0.15625 V Input Range (Gain Code 5) . . . . . . . C-4
Figure C-7. ±0.3125 V Input Range (Gain Code 6) . . . . . . . . C-4
Figure C-8. ±0.625 V Input Range (Gain Code 7) . . . . . . . . . C-5
Figure C-9. ±0.1 V Input Range (Gain Code 8) . . . . . . . . . . . C-5
Figure C-10. ±0.125 V Input Range (Gain Code 9) . . . . . . . . . C-6
Figure C-11. ±0.25 V Input Range (Gain Code 10) . . . . . . . . . C-6
Figure C-12. ±0.5 V Input Range (Gain Code 11) . . . . . . . . . . C-7
Figure C-13. ±0.025 V Input Range (Gain Code 12) . . . . . . . . C-7
Figure C-14. ±0.03125 V Input Range (Gain Code 13) . . . . . . C-8
Figure C-15. ±0.0625 V Input Range (Gain Code 14) . . . . . . . C-8
Figure C-16. ±0.125 V Input Range (Gain Code 15) . . . . . . . . C-9

Features 1-1
1
Overview
The DAS-4300 Series consists of the DAS-4301/8K board. The
DAS-4301/8K is an 8-bit data acquisition board available for IBM

PC AT

or compatible computers, with a conversion rate of up to
1 Gsamples/s. This chapter describes the features of the DAS-4301/8K
board, the software that supports it, and available accessories.
Note:
Not all features of the DAS-4301/8K board are currently supported
by all software packages. Refer to the documentation provided with your
software package to determine which features are supported.
Features
The major features of the DAS-4301/8K board are as follows:
●
Supports high-speed data acquisition on one of two analog input
channels accessed through standard BNC connectors.
●
Provides an analog bandwidth at
−
3 dB of 250 MHz combined with a
true 1 Gsamples/s conversion rate.
●
Provides a flash converter with a resolution of 8 bits.
●
Provides 16 software-selectable input voltage ranges from
±0.025 V to ±1 V.
●
Provides onboard autocalibration to ensure accurate digitization.
●
Stores digitized data in an onboard 8K byte memory buffer.
●
Provides zero wait-state operations to transfer data off the board at up
to 5M byte/s via the ISA bus.

1-2 Overview
●
Supports jumper-selectableAC or DC signal coupling.
●
Provides jumper-selectable 50
Ω
or 1 M
Ω
input impedance.
●
Provides a wide variety of trigger options, including internal and
external triggering and post-trigger delay, which you can use to tailor
the operation of the board to the specific requirements of your
application.
●
Supports Equivalent Time Sampling (ETS) and Random Interleaved
Sampling (RIS) for repetitive waveforms; ETS and RIS provide
conversion rates of up to 20 Gsamples/s.
● Provides a Synchro-Link digital signal processing (DSP) port to
transfer data from onboard memory at up to 25 Msamples/s.
Supporting Software
The following software is available for operating the DAS-4301/8K
board:
●
DAS-4300 Series standard software package - This package, which
comes with the board, is provided on 3.5-inch high-density disks.The
package includes utility programs that allow you to configure, test,
and calibrate the DAS-4301/8K board.
●
ASO-4300 software package - The optional Advanced Software
Option for DAS-4301/8K boards is provided on 3.5-inch high-density
disks. The package includes function libraries for writing application
programs using Microsoft C/C++, Borland
®
C/C++, or Microsoft
Visual Basic

for Windows. The package also includes support files,
utility programs, and language-specific example programs. Refer to
the DAS-4300 Series Function Call Driver User’s Guide for more
information.
●
DAS-4300 Series configuration utility - The configuration utility
(CFG4300.EXE), provided as part of both the DAS-4300 Series
standard software package and theASO-4300 software package, runs
under DOS and allows you to create or modify a configuration file.
The configuration file provides information about the board; this
information is used by the DAS-4300 Series Function Call Driver and
other software packages to perform the board’s operations. Refer to
page 3-8 for more information.

Accessories 1-3
●
DAS-4300 Series scope and test program - The scope and test
program (D4300.EXE) allows you to test the hardware features of a
DAS-4301/8K board, calibrate the analog input circuitry of the board,
and perform basic oscilloscope functions on the board. This program
runs under DOS and is provided as part of both the DAS-4300 Series
standard software package and the ASO-4300 software package.
Refer to Chapter 4 for more information.
●
Visual Test Extensions  (VTX  ) - These optional custom controls
forVisual Basic for Windows help you write application programs for
the DAS-4301/8K board. Refer to the Visual Test Extensions

User’s
Guide and the VTX online help for more information.
●
VisualSCOPE - This optional software package runs under Windows
and emulates a stand-alone oscilloscope on your host computer. Refer
to the VisualSCOPE documentation for more information.
Accessories
The SDC-5600 DSP board is an accessory for the DAS-4301/8K board.
The SDC-5600 uses the optional DSP port on the DAS-4301/8K board to
transfer data at 25M byte/s for digital signal processing applications. This
accessory is available from Sonix Inc., 8700 Morrissette Drive,
Springfield, VA 22152 (703-440-0222).

2-1
2
Functional Description
This chapter describes the features of the DAS-4301/8K board from a
functional point of view. The intent of these descriptions is to familiarize
you with the operating options and to enable you to make the best use of
your board. Figure 2-1 shows a block diagram of the DAS-4301/8K
board.

2-2 Functional Description
Figure 2-1. Block Diagram of the DAS-4301/8K
DAC
(12 bit)
Channel A
Channel B
Relay
DC to
250 MHz
Amp
DAC(12
bit) DAC
(12 bit)
A/D Converter
Offset Vernier Gain
8K byte
FIFO
Memory
DAC
(12-bit) −10 V to +10 V
Threshold Trigger
Comparator (Ch B)
Trigger
Control
Trigger
Clock
Clock
Divider
100 MHz
Oscillator
Counters
Clock
Enable
Status
Data
Clock
Ref
In
ISA Bus Interface (16 bits)
ETS
Delay
RIS
Delay
Data Data
DSP
Port
Data
−FS to +FS
Comparator
(Ch A)

Channels 2-3
Channels
The DAS-4301/8K board can acquire data from one of two analog input
channels at a time: Channel A, accessed from the Ch A connector, or
Channel B, accessed from the Trg/Ch B connector.
You use software to specify ChannelA. To specify Channel B, leave a
jumper installed in positions 1 and 2 of jumper block J103 (the
factory-default configuration), and use software to select Channel B.
ChannelA is terminated with a 50
Ω
impedance. Using a jumper, you can
select an input impedance of 50
Ω
or 1 M
Ω
. Refer to page 3-17 for more
information.
The Trg/Ch B connector is also used for triggering; refer to page 2-10 for
more information on triggering using this connector and selecting the
input impedance for the signal attached to this connector.
Input Ranges
DAS-4301/8K boards support 16 bipolar, factory-calibrated analog input
ranges. Through software, you specify the input range of the analog input
channel.
Table 2-1 lists the analog input ranges supported by DAS-4301/8K boards
and their corresponding gain codes. The gain code is used in software to
determine the input voltage range. The choice of gain code affects the
bandwidth on the DAS-4301/8K board; Appendix C shows the effect of
the input ranges and gain code choices on the bandwidth of the
DAS-4301/8K board.

2-4 Functional Description
The DAS-4301/8K board uses a 4096-step DC signal offset voltage and a
4096-step fine gain control to calibrate the voltage input ranges.
The scope and test program supports binary, twos complement, and
absolute value data coding of the digitized analog input values. The
DAS-4300 Series Function Call Driver and VTX use twos complement
data coding only.
Memory
This section describes memory on the DAS-4301/8K board and on the
host computer.
Onboard Memory
The DAS-4301/8K board contains an 8K byte (8,192 samples) memory
buffer for storing digitized data as well as a nonvolatile EEPROM
memory location for storing calibration values.
Whenever a DAS-4301/8K board is idle, the host computer can access the
data in the onboard memory buffer, download it into its own main
memory, and process it.
Table 2-1. Analog Input Ranges
Analog
Input Range Gain Code Analog Input Range Gain Code
±25 mV 12 ±200 mV 0
±31.25 mV 13 ±250 mV 1, 10
±62.5 mV 14 ±312.5 mV 6
±100 mV 8 ±0.5 V 2, 11
±125 mV 4, 9, 15 ±0.625 V 7
±156.25 mV 5 ±1.0 V 3

Memory 2-5
Host Computer Memory
DAS-4301/8K boards require part of both the host computer I/O address
space and the host computer memory address space.
I/O Address Space
The DAS-4301/8K board uses a block of 16 bytes (ports) in the I/O
address space of the host computer to set up the board’s parameters.
These ports can be located anywhere below 400h, provided that they are
not used by your host computer. The default I/O address space for these
ports is 250h to 25Fh.
You select the base address for the I/O address space by setting jumpers
on the board; refer to page 3-12 for information.
Memory Address Space
The memory address space of the host computer is used for reading the
acquired data from the DAS-4301/8K onboard memory buffer. The host
computer accesses the onboard memory using the decoding logic on the
DAS-4301/8K.
The onboard 8,192 byte buffer memory is mapped into a 16K byte
window within the 1M byte address space in the host computer’s upper
memory (above the 640K byte user memory area).You select the base
address for the memory address space by setting jumpers on the board;
refer to page 3-14 for information. Figure 2-2 illustrates the memory
address space of a host computer.
Note:
The memory map must fall on a 16K byte boundary; this memory
area must not be in use by other boards or devices.