National Instruments SCXI-1121 Manual de usuario Pagina 1

SCXI™SCXI-1121 User ManualFour-Channel Isolated Universal Transducer Modulefor Signal ConditioningSCXI-1121 User ManualSeptember 1999 EditionPart Numb

About This ManualSCXI-1121 User Manual xii www.natinst.commonospace Text in this font denotes text or characters that you should enter from the keyboa

Chapter 5 Programming© National Instruments Corporation 5-9 SCXI-1121 User ManualFollow the instructions in these sections through the part labeled as

Chapter 5 ProgrammingSCXI-1121 User Manual 5-10 www.natinst.comTo program the MIO board to take N samples per data acquisition board scan list entry,

Chapter 5 Programming© National Instruments Corporation 5-11 SCXI-1121 User ManualSingle-Module Multiplexed Scanning (Direct)To perform simple channel

Chapter 5 ProgrammingSCXI-1121 User Manual 5-12 www.natinst.com2. Program the other module not to drive Analog Bus 0, but to send Analog Bus 0 to the

Chapter 5 Programming© National Instruments Corporation 5-13 SCXI-1121 User Manualchannel. See the Counter 1 and SCANDIV subsection of the 1. Data Acq

Chapter 5 ProgrammingSCXI-1121 User Manual 5-14 www.natinst.com5. Write binary 101S 1100 to the HSCR.6. Write binary 101S 1110 to the HSCR.7. Write bi

Chapter 5 Programming© National Instruments Corporation 5-15 SCXI-1121 User Manual• Lab-NB User Manual– Program the sample-interval counter (Counter A

Chapter 5 ProgrammingSCXI-1121 User Manual 5-16 www.natinst.com2. Following the procedure given in the Register Writes section, write 00000000 0000000

Chapter 5 Programming© National Instruments Corporation 5-17 SCXI-1121 User ManualAssuming that the modules are cabled and programmed correctly, the S

© National Instruments Corporation A-1 SCXI-1121 User ManualASpecificationsThis appendix lists the specifications for the SCXI-1121. These are typical

© National Instruments Corporation 1-1 SCXI-1121 User Manual1IntroductionThis chapter describes the SCXI-1121; lists the contents of your SCXI-1121 ki

Appendix A SpecificationsSCXI-1121 User Manual A-2 www.natinst.comFiltering (jumper-selectable) ...4 Hz (–10 dB) or 10 kHz (–3 dB), 3-p

Appendix A Specifications© National Instruments Corporation A-3 SCXI-1121 User ManualRTD ModeExcitation current...0.15

Appendix A SpecificationsSCXI-1121 User Manual A-4 www.natinst.comNote You can find the temperature T (°C) as follows:T = TK – 273.15where TK is the t

© National Instruments Corporation B-1 SCXI-1121 User ManualBRear Signal ConnectorThis appendix describes the pinout and signal names for the SCXI-112

Appendix B Rear Signal ConnectorSCXI-1121 User Manual B-2 www.natinst.comRear Signal Connector Signal DescriptionsSee the Timing Requirements and Comm

© National Instruments Corporation C-1 SCXI-1121 User ManualCSCXIbus ConnectorThis appendix describes the pinout and signal names for the SCXI-1121 96

Appendix C SCXIbus ConnectorSCXI-1121 User Manual C-2 www.natinst.comFigure C-1 shows the pin assignments for the SCXI-1121 SCXIbus connector.Figure C

Appendix C SCXIbus Connector© National Instruments Corporation C-3 SCXI-1121 User ManualSCXIbus Connector Signal Descriptions PinSignal NameDescriptio

Appendix C SCXIbus ConnectorSCXI-1121 User Manual C-4 www.natinst.comFurther information is given in Chapter 3, Theory of Operation.A24 TRIG0 TRIG0—Ge

© National Instruments Corporation D-1 SCXI-1121 User ManualDSCXI-1121 Front ConnectorThis appendix describes the pinout and signal names for the SCXI

Chapter 1 IntroductionSCXI-1121 User Manual 1-2 www.natinst.comWhat Your Kit Should ContainThe contents of the SCXI-1121 kit (part number 776572-21) a

Appendix D SCXI-1121 Front ConnectorSCXI-1121 User Manual D-2 www.natinst.comFigure D-1 shows the pin assignments for the SCXI-1121 front connector.Fi

Appendix D SCXI-1121 Front Connector© National Instruments Corporation D-3 SCXI-1121 User ManualFront Connector Signal DescriptionsPinSignal NameDescr

Appendix D SCXI-1121 Front ConnectorSCXI-1121 User Manual D-4 www.natinst.comFurther information is given in Chapter 2, Configuration and Installation

© National Instruments Corporation E-1 SCXI-1121 User ManualESCXI-1121 CablingThis appendix describes how to use and install the hardware accessories

Appendix E SCXI-1121 CablingSCXI-1121 User Manual E-2 www.natinst.comYou can use a standard 50-pin ribbon cable instead of the SCXI-1340 cable assembl

Appendix E SCXI-1121 Cabling© National Instruments Corporation E-3 SCXI-1121 User ManualNo other pins are connected on the SCXI-1121.SCXI-1340 Install

Appendix E SCXI-1121 CablingSCXI-1121 User Manual E-4 www.natinst.comFigure E-1. SCXI-1340 InstallationSCXI-1341 Lab-NB, Lab-PC, or Lab-PC+ and SCXI-

Appendix E SCXI-1121 Cabling© National Instruments Corporation E-5 SCXI-1121 User Manualjumper W1. Table E-2 lists the SCXI-1341 and SCXI-1344 pin tra

Appendix E SCXI-1121 CablingSCXI-1121 User Manual E-6 www.natinst.comAll other pins of the Lab board pinout are not sent to the SCXI-1121 rear signal

Appendix E SCXI-1121 Cabling© National Instruments Corporation E-7 SCXI-1121 User ManualTable E-3. SCXI-1342 Pin TranslationsPC-LPM-16 Pin PC-LPM-16

Chapter 1 Introduction© National Instruments Corporation 1-3 SCXI-1121 User Manualfor DOS and Visual Basic, Turbo Pascal, Microsoft C with SDK, and Bo

Appendix E SCXI-1121 CablingSCXI-1121 User Manual E-8 www.natinst.comAll other pins of the PC-LPM-16 pinout are not sent to the SCXI-1121 rear signal

Appendix E SCXI-1121 Cabling© National Instruments Corporation E-9 SCXI-1121 User ManualSCXI-1180 InstallationInstall the SCXI-1180 to the right of a

Appendix E SCXI-1121 CablingSCXI-1121 User Manual E-10 www.natinst.comFigure E-3. SCXI-1180 Front Panel InstallationSCXI-1302 50-Pin Terminal BlockTh

Appendix E SCXI-1121 Cabling© National Instruments Corporation E-11 SCXI-1121 User Manual6. Snap the cover back in place.7. Reinsert the rear groundin

Appendix E SCXI-1121 CablingSCXI-1121 User Manual E-12 www.natinst.comSCXI-1351 One-Slot Cable ExtenderThe SCXI-1351 cable extender is a miniature SCX

Appendix E SCXI-1121 Cabling© National Instruments Corporation E-13 SCXI-1121 User ManualThe adapter board has a male rear connector, a female front c

Appendix E SCXI-1121 CablingSCXI-1121 User Manual E-14 www.natinst.comSCXI-1343 Rear Screw Terminal AdapterYou use the SCXI-1343 universal adapter to

Appendix E SCXI-1121 Cabling© National Instruments Corporation E-15 SCXI-1121 User Manual12 MCH4– Screw terminal13 No Connect Screw terminal14 No Conn

Appendix E SCXI-1121 CablingSCXI-1121 User Manual E-16 www.natinst.com39 No Connect Solder pad40 No Connect Solder pad41 No Connect Solder pad42 No Co

© National Instruments Corporation F-1 SCXI-1121 User ManualFRevision A and B Photo and Parts Locator Diagrams This appendix contains a photograph of

Chapter 1 IntroductionSCXI-1121 User Manual 1-4 www.natinst.comOptional EquipmentEquipment Part NumberNB6 cable0.5 m 181305-011.0 m 181305-10SCXI-1320

Appendix F Revision A and B Photo and Parts Locator DiagramsSCXI-1121 User Manual F-2 www.natinst.comFigure F-2. Revision A and B SCXI-1121 General P

Appendix F Revision A and B Photo and Parts Locator Diagrams© National Instruments Corporation F-3 SCXI-1121 User ManualFigure F-3. Revision A and B

© National Instruments Corporation G-1 SCXI-1121 User ManualGTechnical Support ResourcesThis appendix describes the comprehensive resources available

Appendix G Technical Support ResourcesSCXI-1121 User Manual G-2 www.natinst.comSoftware-Related Resources• Instrument Driver Network—A library with hu

© National Instruments Corporation Glossary-1 SCXI-1121 User ManualGlossaryPrefix Meaning Valuep- pico- 10–12n- nano- 10–9µ- micro- 10–6m- milli- 10–3

GlossarySCXI-1121 User Manual Glossary-2 www.natinst.comAOGND analog output ground signalArms amperes, root mean squareAWG American Wire GaugeBBW band

Glossary© National Instruments Corporation Glossary-3 SCXI-1121 User ManualDIG GND digital ground signalDIN Deutsche Industrie NormeDMM digital multim

GlossarySCXI-1121 User Manual Glossary-4 www.natinst.comHSRS* hardscan reset bitHz hertzIIIinput current leakagein. inchesINTR* interrupt signalI/O in

Glossary© National Instruments Corporation Glossary-5 SCXI-1121 User ManualMTEMP multiplexed temperature sensorMTS multiplexed temperature sensorNNRSE

GlossarySCXI-1121 User Manual Glossary-6 www.natinst.comSSCAL (bit) shunt calibrate bitSCAL (signal) shunt calibration signalSCANCLK scan clock signal

Chapter 1 Introduction© National Instruments Corporation 1-5 SCXI-1121 User ManualRefer to the Signal Connections section in Chapter 2, Configuration

Glossary© National Instruments Corporation Glossary-7 SCXI-1121 User ManualUUL Underwriters LaboratoryVV voltsV+ positive analog supply signalV– negat

© National Instruments Corporation Index-1 SCXI-1121 User ManualIndexNumbers+5 V signalfront connector (table), 2-18, D-3SCXIbus connector (table), 3-

IndexSCXI-1121 User Manual Index-2 www.natinst.comCcable assemblies. See SCXI-1121 cabling.cables, custom, 1-5calibration, 3-11 to 3-14equipment requi

Index© National Instruments Corporation Index-3 SCXI-1121 User ManualCounter 1, scanning measurements, 5-9 to 5-10current and voltage excitation jumpe

IndexSCXI-1121 User Manual Index-4 www.natinst.comFFIFO Registerdescription, 4-9register writes, 5-2 to 5-4filter jumpersallocation (table), 2-9descri

Index© National Instruments Corporation Index-5 SCXI-1121 User ManualSCXI-1341 Lab-NB, Lab-PC, or Lab-PC+ cable assembly, E-6SCXI-1342 PC-LPM-16 cable

IndexSCXI-1121 User Manual Index-6 www.natinst.comSCXIbus to SCXI-1121 rear signal connector to DAQ board pin equivalences (table), 2-41MTEMP signal (

Index© National Instruments Corporation Index-7 SCXI-1121 User ManualSCXI-1344 Lab-PC+ cable assembly, E-5problem-solving and diagnostic resources, on

IndexSCXI-1121 User Manual Index-8 www.natinst.comtiming diagram, 2-46Slot 0 Registerdescription, 4-5programming hardscan circuitry, 5-13 to 5-14Slot-

Index© National Instruments Corporation Index-9 SCXI-1121 User ManualSCXI-1343 rear screw terminal adapter, E-14 to E-16SCXI-1344 Lab-PC+ cable assemb

Chapter 1 IntroductionSCXI-1121 User Manual 1-6 www.natinst.comUnpackingYour SCXI-1121 module is shipped in an antistatic package to prevent electrost

IndexSCXI-1121 User Manual Index-10 www.natinst.comSERCLK signal. See also communication signals.description (table), 2-38, B-2register writes, 5-2 to

Index© National Instruments Corporation Index-11 SCXI-1121 User ManualSCXIbus to SCXI-1121 rear signal connector to DAQ board pin equivalences (table)

IndexSCXI-1121 User Manual Index-12 www.natinst.comWWeb support from National Instruments, G-1 to G-2online problem-solving and diagnostic resources,

© National Instruments Corporation 2-1 SCXI-1121 User Manual2Configuration and InstallationThis chapter describes the SCXI-1121 jumper configurations,

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-2 www.natinst.comFigure 2-2. SCXI-1121 Detailed Parts Locator DiagramThe jumpers are

Chapter 2 Configuration and Installation© National Instruments Corporation 2-3 SCXI-1121 User Manual– Jumpers W3, W19, W29, and W41 configure the firs

Worldwide Technical Support and Product Informationwww.natinst.comNational Instruments Corporate Headquarters11500 North Mopac Expressway Austin, Texa

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-4 www.natinst.comOn Revision C or later modules, jumper W44 does not exist. SLOT0SEL*

Chapter 2 Configuration and Installation© National Instruments Corporation 2-5 SCXI-1121 User ManualW38 in its factory default position (position 1).

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-6 www.natinst.comAnalog ConfigurationThe SCXI-1121 has 45 analog configuration jumpers

Chapter 2 Configuration and Installation© National Instruments Corporation 2-7 SCXI-1121 User ManualPosition AB-R1 connects the analog reference to th

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-8 www.natinst.comInput Channel JumpersGain JumpersEach input channel has two gain stag

Chapter 2 Configuration and Installation© National Instruments Corporation 2-9 SCXI-1121 User ManualFilter JumpersTwo-stage filtering is also availabl

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-10 www.natinst.comExcitation LevelEach excitation channel of your SCXI-1121 has two di

Chapter 2 Configuration and Installation© National Instruments Corporation 2-11 SCXI-1121 User ManualAfter selecting the excitation mode of operation

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-12 www.natinst.comUsing the Internal Half-Bridge CompletionYour SCXI-1121 includes hal

Chapter 2 Configuration and Installation© National Instruments Corporation 2-13 SCXI-1121 User Manual2 W27 and W283 W39 and W40Table 2-9. Completion

Important InformationWarrantyThe SCXI-1121 is warranted against defects in materials and workmanship for a period of one year from the date of shipme

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-14 www.natinst.comHardware InstallationYou can install the SCXI-1121 in any available

Chapter 2 Configuration and Installation© National Instruments Corporation 2-15 SCXI-1121 User ManualSignal ConnectionsThis section describes the inpu

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-16 www.natinst.comWhen connecting or disconnecting signal lines to the SCXI terminal b

Chapter 2 Configuration and Installation© National Instruments Corporation 2-17 SCXI-1121 User ManualFigure 2-3. SCXI-1121 Front Connector Pin Assign

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-18 www.natinst.comFront Connector Signal DescriptionsPin Signal Name DescriptionA2 CG

Chapter 2 Configuration and Installation© National Instruments Corporation 2-19 SCXI-1121 User ManualThe signals on the front connector are all analog

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-20 www.natinst.comAnalog Input ChannelsThe positive input channels are located in colu

Chapter 2 Configuration and Installation© National Instruments Corporation 2-21 SCXI-1121 User ManualFigure 2-6. Floating AC-Coupled Signal Connectio

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-22 www.natinst.comWarning Exceeding the input signal range and the common-mode input r

Chapter 2 Configuration and Installation© National Instruments Corporation 2-23 SCXI-1121 User Manual3. Turn off your SCXI chassis.4. Slide the select

© National Instruments Corporation v SCXI-1121 User ManualContentsAbout This ManualConventions ...

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-24 www.natinst.comSCXI-1320, SCXI-1328, and SCXI-1321 Terminal BlocksThe second type o

Chapter 2 Configuration and Installation© National Instruments Corporation 2-25 SCXI-1121 User ManualSCXI-1321 Offset-Null and Shunt-Calibration Termi

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-26 www.natinst.comThe value of all the nulling resistors on your terminal block is 39

Chapter 2 Configuration and Installation© National Instruments Corporation 2-27 SCXI-1121 User ManualAssuming a strain-gauge range with a gauge factor

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-28 www.natinst.comSCXI-1121 Shunt CalibrationShunt calibration circuits are independen

Chapter 2 Configuration and Installation© National Instruments Corporation 2-29 SCXI-1121 User ManualFigure 2-10. Shunt CircuitThe shunting resistors

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-30 www.natinst.comTerminal Block Temperature SensorTo accommodate thermocouples with t

Chapter 2 Configuration and Installation© National Instruments Corporation 2-31 SCXI-1121 User Manuala = 1.288 x 10–3b = 2.356 x 10–4c = 9.556 x 10–8R

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-32 www.natinst.comTables 2-13, 2-14, and 2-15 show the jumper settings on the SCXI-132

Chapter 2 Configuration and Installation© National Instruments Corporation 2-33 SCXI-1121 User ManualTerminal Block Signal ConnectionWarningsThe chass

ContentsSCXI-1121 User Manual vi www.natinst.comChapter 3Theory of OperationFunctional Overview ...

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-34 www.natinst.comFigure 2-11. SCXI-1320 Parts Locator Diagram

Chapter 2 Configuration and Installation© National Instruments Corporation 2-35 SCXI-1121 User ManualFigure 2-12. SCXI-1328 Parts Locator Diagram

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-36 www.natinst.comFigure 2-13. SCXI-1321 Parts Locator DiagramTerminal Block Installa

Chapter 2 Configuration and Installation© National Instruments Corporation 2-37 SCXI-1121 User ManualRear Signal ConnectorNoteIf you are using the SCX

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-38 www.natinst.comRear Signal Connector Signal Descriptions Pin Signal Name Descriptio

Chapter 2 Configuration and Installation© National Instruments Corporation 2-39 SCXI-1121 User ManualThe signals on the rear signal connector can be c

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-40 www.natinst.comDigital I/O Signal ConnectionsPins 24 through 27, 29, 33, 36, 37, an

Chapter 2 Configuration and Installation© National Instruments Corporation 2-41 SCXI-1121 User ManualThe digital timing signals are pins 36 and 43.• P

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-42 www.natinst.comTiming Requirements and Communication ProtocolTiming SignalThe data

Chapter 2 Configuration and Installation© National Instruments Corporation 2-43 SCXI-1121 User ManualFigure 2-16. Slot-Select Timing DiagramTo write

Contents© National Instruments Corporation vii SCXI-1121 User Manual2. Module Programming ...

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-44 www.natinst.comFigure 2-17 shows the timing requirements on the SERCLK and SERDATIN

Chapter 2 Configuration and Installation© National Instruments Corporation 2-45 SCXI-1121 User Manual3. Pull SLOT0SEL* low to deassert the SS* line an

Chapter 2 Configuration and InstallationSCXI-1121 User Manual 2-46 www.natinst.comFigure 2-19 illustrates a read of the SCXI-1121 Module ID Register.F

© National Instruments Corporation 3-1 SCXI-1121 User Manual3Theory of OperationThis chapter contains a functional overview of the SCXI-1121 module an

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-2 www.natinst.comThe major components of the SCXI-1121 are as follows:• SCXIbus connector• Digita

Chapter 3 Theory of Operation© National Instruments Corporation 3-3 SCXI-1121 User ManualSCXIbus ConnectorFigure 3-2 shows the pin assignments for the

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-4 www.natinst.comSCXIbus Connector Signal Descriptions Pin Signal Name DescriptionA1, B1, C1, D1,

Chapter 3 Theory of Operation© National Instruments Corporation 3-5 SCXI-1121 User ManualMOSI, MISO, SPICLK, and SS* form a synchronous communication

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-6 www.natinst.comchassis is being used), and then releasing INTR* high. At this point, SS* of the

Chapter 3 Theory of Operation© National Instruments Corporation 3-7 SCXI-1121 User ManualDigital Control CircuitryFigure 3-4 diagrams the SCXI-1121 di

ContentsSCXI-1121 User Manual viii www.natinst.comFiguresFigure 2-1. SCXI-1121 General Parts Locator Diagram...

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-8 www.natinst.com3. The serial data is available on MOSI and SPICLK clocks it into the register.4

Chapter 3 Theory of Operation© National Instruments Corporation 3-9 SCXI-1121 User ManualFigure 3-5. Analog Input Block Diagram+–+–+–+–Input Channel

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-10 www.natinst.comThe analog input consists of four isolated single-ended noninverting amplifiers

Chapter 3 Theory of Operation© National Instruments Corporation 3-11 SCXI-1121 User ManualAfter isolation, further filtering is available to increase

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-12 www.natinst.com• You also need a 120 Ω 1/4 W precision resistor with tempco less than or equal

Chapter 3 Theory of Operation© National Instruments Corporation 3-13 SCXI-1121 User Manual8. Adjust the input potentiometer of the channel of interest

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-14 www.natinst.comThis procedure calibrates the 10 V and 450 µA levels at the same time but the a

Chapter 3 Theory of Operation© National Instruments Corporation 3-15 SCXI-1121 User ManualAnalog Output CircuitryFigure 3-6 shows the SCXI-1121 analog

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-16 www.natinst.comin the Configuration Register when SCANCON is high (inactive) and will count up

Chapter 3 Theory of Operation© National Instruments Corporation 3-17 SCXI-1121 User ManualScanning ModesThere are four basic types of scanning modes p

Contents© National Instruments Corporation ix SCXI-1121 User ManualFigure E-2. SCXI-1180 Rear Connections...

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-18 www.natinst.comentry. The list in Slot 0 will determine which module is being accessed and for

Chapter 3 Theory of Operation© National Instruments Corporation 3-19 SCXI-1121 User ManualFigure 3-9. Single-Module Multiplexed Scanning (Indirect)Mu

Chapter 3 Theory of OperationSCXI-1121 User Manual 3-20 www.natinst.comMultiple-Chassis ScanningIn this mode, you attach each SCXI-1001 chassis to a d

© National Instruments Corporation 4-1 SCXI-1121 User Manual4Register DescriptionsThis chapter describes in detail the SCXI-1121 Module ID Register, t

Chapter 4 Register DescriptionsSCXI-1121 User Manual 4-2 www.natinst.comModule ID RegisterThe Module ID Register contains the 4-byte module ID code fo

Chapter 4 Register Descriptions© National Instruments Corporation 4-3 SCXI-1121 User ManualConfiguration RegisterThe Configuration Register contains 1

Chapter 4 Register DescriptionsSCXI-1121 User Manual 4-4 www.natinst.com9-8 CHAN<1..0> Channel Select—These bits determine the channel number (z

Chapter 4 Register Descriptions© National Instruments Corporation 4-5 SCXI-1121 User Manual0 FOUTEN* Forced Output Enable—This bit determines whether

Chapter 4 Register DescriptionsSCXI-1121 User Manual 4-6 www.natinst.comSlot-Select RegisterThe Slot-Select Register contains 16 bits that determine w

Chapter 4 Register Descriptions© National Instruments Corporation 4-7 SCXI-1121 User ManualHardscan Control Register (HSCR)The HSCR contains eight bit

© National Instruments Corporation xi SCXI-1121 User ManualAbout This ManualThis manual describes the electrical and mechanical aspects of the SCXI-11

Chapter 4 Register DescriptionsSCXI-1121 User Manual 4-8 www.natinst.com1 SCANCONEN Scan Control Enable—When set, this bit enables the SCANCON lines.

Chapter 4 Register Descriptions© National Instruments Corporation 4-9 SCXI-1121 User ManualFIFO RegisterThe FIFO Register is used to add entries to th

© National Instruments Corporation 5-1 SCXI-1121 User Manual5ProgrammingThis chapter contains a functional programming description of the SCXI-1121 an

Chapter 5 ProgrammingSCXI-1121 User Manual 5-2 www.natinst.comRegister WritesThis section describes how to write to the Configuration Register, HSCR,

Chapter 5 Programming© National Instruments Corporation 5-3 SCXI-1121 User Manual3. For each bit, starting with the MSB first (bit 15):a. SERDATIN = b

Chapter 5 ProgrammingSCXI-1121 User Manual 5-4 www.natinst.comto MCH0 through MCH3 on the rear signal connector. The module is disconnected from Analo

Chapter 5 Programming© National Instruments Corporation 5-5 SCXI-1121 User ManualTo measure one of the four differential input channels to the SCXI-11

Chapter 5 ProgrammingSCXI-1121 User Manual 5-6 www.natinst.comMeasurements from the SCXI-1121 via Another ModuleTo perform measurements via another mo

Chapter 5 Programming© National Instruments Corporation 5-7 SCXI-1121 User ManualScanning MeasurementsProgramming for scanned data acquisition involve

Chapter 5 ProgrammingSCXI-1121 User Manual 5-8 www.natinst.com• AT-MIO-16X User Manual – Continuous Channel Scanning Data Acquisition– Interval Channe