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DAS-800 Series Register-Level Programming User's Guide Revision A - October 1993 Part Number: 86890 The information contained in this manual is believed to be accurateand reliable. However, Keithley Instruments, Inc., assumes responsibility for its use; nor for any infringements or patentsor other no 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 FOR ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RELATED TO THE USE OF THIS PRODUCT. THIS PRODUCT IS NOT DESIGNED WITH COMPONENTS OE 4 LEVEL OF RELIABILITY THAT IS SUITED FOR USE IN LIFE SUPPORTOR CRITICAL APPLICATIONS. Refer to your Keithley Instruments license agreementand Conditions of Sale document for specific warranty and liability information. All brand and product namesax trademarksor registeredtrademarksof theirrespective companies. 0 Copyright Keithley Instruments, Inc., 1993. All rights reserved.Reproduction or adaptationof any part of this documentationbeyond that permitted by Section 117 of the 1976United StatesCopyright Act without permission of the Copyright owner is unlawful. Keithley Instruments, Data Acquisition Division 440 Myles Standish Blvd. Taunton, MA 02780 Telephone: (508) X80-3000. FAX: (508) x80-0179 Table of Contents Preface 1 Hardware Registers A/D Conversion Registers (Base Address + 0, Base Address + 1, Write). . l-4 A/D Conversion Registers (Base Address + 0, Base Address + 1, Read). . . . . . . . 1-s Control Register (Base Address + 2, Write) . . . .. . 1-x Control Register 1 (Base Address + 2, Write) . . . 1-x Conversion Control Register (Base Address + 2, Write) i-11 Scan Limits Register (Base Address + 2, Write) . . l-15 Status Register 1 (Base Address + 2, Read) .. 1-17 Gain / Control Select Register (Base Address + 3, Write). 1-19 Gain / Channel Status Register (Base Address + 3, Read) 1-21 Status Register (Base Address + 7, Read) 1-23 Status Register 2 (Base Address + 7, Read) . . . . 1-23 ID Register (Base Address + 7, Read) . . . . . . . . . . . . . l-25 2 Programming Guidelines Performing a S&ware-Initiated A/D Conversion. ... .2-l Performing a Hardware-Initiated AD Conversion ... .2-2 Setting Up the Internal Clock ... .2-5 Setting Up an Analog Trigger ... .2-8 A Summary of Registers B Converting Binary