Page 2 - Worldwide Offices
Worldwide Technical Support and Product Information www.natinst.com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 794 0100 Worldwide Offices Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20, Brazil 011 284 5011, Ca...
Page 3 - Important Information; Warranty; Copyright; WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
Important Information Warranty The SCXI-1121 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defectiv...
Page 4 - Contents; About This Manual
© National Instruments Corporation v SCXI-1121 User Manual Contents About This Manual Conventions ................................................................................................................... xiRelated Documentation..................................................................
Page 6 - Glossary
Contents © National Instruments Corporation vii SCXI-1121 User Manual 2. Module Programming ................................................................... 5-103. Programming the Slot 0 Hardscan Circuitry ................................. 5-134. Acquisition Enable, Triggering, and Servicing........
Page 7 - Figures
Contents SCXI-1121 User Manual viii www.natinst.com Figures Figure 2-1. SCXI-1121 General Parts Locator Diagram ......................................... 2-2 Figure 2-2. SCXI-1121 Detailed Parts Locator Diagram ........................................ 2-3 Figure 2-3. SCXI-1121 Front Connector Pin As...
Page 8 - Tables
Contents © National Instruments Corporation ix SCXI-1121 User Manual Figure E-2. SCXI-1180 Rear Connections ............................................................... E-9 Figure E-3. SCXI-1180 Front Panel Installation ...................................................... E-10 Figure E-4. Cover...
Page 9 - Conventions; The following conventions appear in this manual:; bold; italic
© National Instruments Corporation xi SCXI-1121 User Manual About This Manual This manual describes the electrical and mechanical aspects of the SCXI-1121 and contains information concerning its operation and programming. The SCXI-1121 is a member of the National Instruments Signal Conditioning eXte...
Page 10 - Related Documentation
About This Manual SCXI-1121 User Manual xii www.natinst.com monospace Text in this font denotes text or characters that you should enter from the keyboard, sections of code, programming examples, and syntax examples. This font is also used for the proper names of disk drives, paths, directories, pro...
Page 11 - Introduction; Configuration and Installation
© National Instruments Corporation 1-1 SCXI-1121 User Manual 1 Introduction This chapter describes the SCXI-1121; lists the contents of your SCXI-1121 kit; describes the optional software, optional equipment, and custom cables; and explains how to unpack the SCXI-1121 kit. The SCXI-1121 consists of ...
Page 12 - What Your Kit Should Contain; Kit Component
Chapter 1 Introduction SCXI-1121 User Manual 1-2 www.natinst.com What Your Kit Should Contain The contents of the SCXI-1121 kit (part number 776572-21) are listed as follows: If your kit is missing any of the components, contact National Instruments. Optional Software This manual contains complete i...
Page 14 - Optional Equipment; Equipment
Chapter 1 Introduction SCXI-1121 User Manual 1-4 www.natinst.com Optional Equipment Equipment Part Number NB6 cable 0.5 m 181305-01 1.0 m 181305-10 SCXI-1320 front terminal block 776573-20 SCXI-1321 offset-null and shunt-calibration terminal block 776573-21 SCXI-1328 high-accuracy isothermal termina...
Page 15 - Refer to the; Custom Cables
Chapter 1 Introduction © National Instruments Corporation 1-5 SCXI-1121 User Manual Refer to the Signal Connections section in Chapter 2, Configuration and Installation , and to Appendix E, SCXI-1121 Cabling , for additional information on cabling, connectors, and adapters. Custom Cables The SCXI-11...
Page 16 - Unpacking
Chapter 1 Introduction SCXI-1121 User Manual 1-6 www.natinst.com Unpacking Your SCXI-1121 module is shipped in an antistatic package to prevent electrostatic damage to the module. Several components on the module can be damaged by electrostatic discharge. To avoid such damage in handling the module,...
Page 17 - Module Configuration
© National Instruments Corporation 2-1 SCXI-1121 User Manual 2 Configuration and Installation This chapter describes the SCXI-1121 jumper configurations, installation of the SCXI-1121 into the SCXI chassis, signal connections to the SCXI-1121, and cable wiring. Module Configuration The SCXI-1121 con...
Page 18 - The jumpers are used as follows:
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-2 www.natinst.com Figure 2-2. SCXI-1121 Detailed Parts Locator Diagram The jumpers are used as follows: • Fixed jumpers – On Revision A and B modules, jumper W32 is unused and should not be connected. – Jumper W45 is reserved and shoul...
Page 19 - Digital Signal Connections; Timing Requirements and
Chapter 2 Configuration and Installation © National Instruments Corporation 2-3 SCXI-1121 User Manual – Jumpers W3, W19, W29, and W41 configure the first-stage gain of input channels 0 through 3, respectively. – Jumpers W4, W20, W30, and W42 configure the second-stage gain of input channels 0 throug...
Page 21 - Jumper; Parking position
Chapter 2 Configuration and Installation © National Instruments Corporation 2-5 SCXI-1121 User Manual W38 in its factory default position (position 1). On all but one of the SCXI-1121s that are cabled to the data acquisition board, move jumper W32 to position 3. It does not matter which of the SCXI-...
Page 22 - Analog Configuration; The SCXI-1121 has 45 analog configuration jumpers.
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-6 www.natinst.com Analog Configuration The SCXI-1121 has 45 analog configuration jumpers. Before starting, notice that the jumper configurations for each input channel and each excitation channel are similar only the jumper numbers dif...
Page 23 - Position AB-R1 connects the analog reference to the SCXIbus guard.
Chapter 2 Configuration and Installation © National Instruments Corporation 2-7 SCXI-1121 User Manual Position AB-R1 connects the analog reference to the SCXIbus guard. Position A-R0R1 is the parking position and the factory setting. Position AB-R2 enables the Pseudodifferential Reference mode and c...
Page 24 - Input Channel Jumpers; Gain Jumpers
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-8 www.natinst.com Input Channel Jumpers Gain Jumpers Each input channel has two gain stages. The first gain stage provides gains of 1, 10, 50, and 100 and the second stage provides gains of 1, 2, 5, 10, and 20. Tables 2-3 and 2-4 show ...
Page 25 - Filter Jumpers; Excitation Jumpers; Current and Voltage Excitation Jumpers; Input Channel
Chapter 2 Configuration and Installation © National Instruments Corporation 2-9 SCXI-1121 User Manual Filter Jumpers Two-stage filtering is also available on your SCXI-1121 module. The first stage is located in the isolated section of the input channel, whereas the second stage is located in the non...
Page 26 - Excitation Level; In the Current mode; Excitation
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-10 www.natinst.com Excitation Level Each excitation channel of your SCXI-1121 has two different current or voltage levels. You can set a given channel to one of the following level modes: • In the Current mode 0.150 or 0.450 mA • In th...
Page 28 - Using the Internal Half-Bridge Completion; ± 0.05% ratio tolerance resistors with a temperature coefficient of; Channel
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-12 www.natinst.com Using the Internal Half-Bridge Completion Your SCXI-1121 includes half-bridge completion for half-bridge and quarter-bridge setups. The completion network consists of two 4.5 k Ω ± 0.05% ratio tolerance resistors wit...
Page 30 - Hardware Installation; Technical Support Resources
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-14 www.natinst.com Hardware Installation You can install the SCXI-1121 in any available SCXI chassis. After you have made any necessary changes and have verified and recorded the jumper settings on the form in Appendix G, Technical Sup...
Page 31 - Signal Connections; Cautions
Chapter 2 Configuration and Installation © National Instruments Corporation 2-15 SCXI-1121 User Manual Signal Connections This section describes the input and output signal connections to the SCXI-1121 board via the SCXI-1121 front connector and rear signal connector, and includes specifications and...
Page 32 - 0 Vrms and 42.4 V peak or 60 VDC) are present, you must connect a; Front Connector
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-16 www.natinst.com When connecting or disconnecting signal lines to the SCXI terminal block screw terminals, make sure the lines are powered off. Potential differences between the lines and the SCXI ground create a shock hazard while y...
Page 34 - Front Connector Signal Descriptions; Pin; Do not connect any signal to these pins.
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-18 www.natinst.com Front Connector Signal Descriptions Pin Signal Name Description A2 CGND Chassis Ground—This pin is tied to the SCXI chassis. C2 DTEMP Direct Temperature Sensor—This pin connects the temperature sensor to the MCH4+ wh...
Page 36 - Analog Input Channels
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-20 www.natinst.com Analog Input Channels The positive input channels are located in column A. Their corresponding negative input channels are located in column C. Each input corresponds to a separate amplifier and is fully isolated fro...
Page 38 - Excitation Channels; Warning; Temperature Sensor Connection; Warning
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-22 www.natinst.com Warning Exceeding the input signal range and the common-mode input range results in distorted signals. Exceeding the maximum input voltage rating (250 V rms between positive and negative terminals and between any ter...
Page 40 - Optional; ) are present, you must connect the safety earth ground to the
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-24 www.natinst.com SCXI-1320, SCXI-1328, and SCXI-1321 Terminal Blocks The second type of connector available to connect the transducers to the SCXI-1121 inputs is a terminal block with an onboard temperature sensor and screw terminals...
Page 41 - SCXI-1321 Nulling Circuitry; Configure your bridge to the selected channel.; Channel Number
Chapter 2 Configuration and Installation © National Instruments Corporation 2-25 SCXI-1121 User Manual SCXI-1321 Offset-Null and Shunt-Calibration Terminal Block The SCXI-1321 terminal block operates only with Revision C and later SCXI-1121 modules. In addition to the 18 screw terminals, the SCXI-13...
Page 42 - where
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-26 www.natinst.com The value of all the nulling resistors on your terminal block is 39 k Ω . Notice that these resistors are socketed for easy replacement. These sockets best fit a 1/4 W resistor lead size. To determine your nulling ra...
Page 43 - as given; Using the SCXI-1321 with RTDs and Thermistors; Remove the nulling resistor from its sockets.
Chapter 2 Configuration and Installation © National Instruments Corporation 2-27 SCXI-1121 User Manual Assuming a strain-gauge range with a gauge factor of GF = 2 and a quarter-bridge configuration, this range corresponds to ±1,498 µ ε as given by the strain formula for a quarter-bridge strain-gauge...
Page 44 - SCXI-1121 Shunt Calibration; Nulling circuit of Channel 0 is disabled
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-28 www.natinst.com SCXI-1121 Shunt Calibration Shunt calibration circuits are independent from each other but are controlled together. In other words, when SCAL is set to 1 on the SCXI-1121, all the shunt switches close when SCAL is cl...
Page 46 - Terminal Block Temperature Sensor; Configuration Register; where T
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-30 www.natinst.com Terminal Block Temperature Sensor To accommodate thermocouples with the SCXI-1121, the terminal block has an onboard temperature sensor for cold-junction compensation. You can connect this temperature sensor in two w...
Page 47 - = resistance of the thermistor in; = output voltage of the temperature sensor; Terminal Block Jumper Configuration; ln
Chapter 2 Configuration and Installation © National Instruments Corporation 2-31 SCXI-1121 User Manual a = 1.288 x 10 –3 b = 2.356 x 10 –4 c = 9.556 x 10 –8 R T = resistance of the thermistor in Ω V TEMPOUT = output voltage of the temperature sensor where T (°F) and T (°C) are the temperature readin...
Page 48 - DTS mode selected; DTS mode selected
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-32 www.natinst.com Tables 2-13, 2-14, and 2-15 show the jumper settings on the SCXI-1320, SCXI-1328, and SCXI-1321 terminal blocks. Table 2-13. Jumper Settings on the SCXI-1320 Terminal Block Jumper Position Description W1 MTS mode sel...
Page 49 - Terminal Block Signal Connection; Warnings; with RTDs and Thermistors
Chapter 2 Configuration and Installation © National Instruments Corporation 2-33 SCXI-1121 User Manual Terminal Block Signal Connection Warnings The chassis GND terminals on your terminal block are for grounding high impedance sources such as a floating source (1 mA maximum). Do not use these termin...
Page 52 - Terminal Block Installation
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-36 www.natinst.com Figure 2-13. SCXI-1321 Parts Locator Diagram Terminal Block Installation To connect the terminal block to the SCXI-1121 front connector, perform the following steps: 1. Connect the SCXI-1121 front connector to its ma...
Page 53 - Rear Signal Connector; Note
Chapter 2 Configuration and Installation © National Instruments Corporation 2-37 SCXI-1121 User Manual Rear Signal Connector Note If you are using the SCXI-1121 with a National Instruments data acquisition board and cable assembly, you do not need to read the remainder of this chapter. If you are us...
Page 54 - Rear Signal Connector Signal Descriptions
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-38 www.natinst.com Rear Signal Connector Signal Descriptions Pin Signal Name Description 1-2 AOGND Analog Output Ground—These pins are connected to the analog reference when jumper W33 is in position AB-R0. 3-12 MCH0± through MCH4± Ana...
Page 55 - Analog Output Signal Connections; Terminal Blocks
Chapter 2 Configuration and Installation © National Instruments Corporation 2-39 SCXI-1121 User Manual The signals on the rear signal connector can be classified as analog output signals, digital I/O signals, or timing I/O signals. Signal connection guidelines for each of these groups are given in t...
Page 56 - Digital I/O Signal Connections; The digital output signal is pin 26.
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-40 www.natinst.com Digital I/O Signal Connections Pins 24 through 27, 29, 33, 36, 37, and 43 constitute the digital I/O lines of the rear signal connector. They are divided into three categories—the digital input signals, the digital o...
Page 57 - Theory of Operation; SCXIbus Line
Chapter 2 Configuration and Installation © National Instruments Corporation 2-41 SCXI-1121 User Manual The digital timing signals are pins 36 and 43. • Pin 36 is used as a clock by the SCXI-1121 to increment the MUXCOUNTER after each conversion by the data acquisition board during scanning. This sig...
Page 58 - Timing Requirements and Communication Protocol; Timing Signal; The data acquisition timing signal is SCANCLK.; For output selection time specifications, refer to Appendix A,; Communication Signals; Register Descriptions
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-42 www.natinst.com Timing Requirements and Communication Protocol Timing Signal The data acquisition timing signal is SCANCLK. SCANCLK is used to increment MUXCOUNTER on its rising edge. Figure 2-15 shows the timing requirements of the...
Page 60 - To write to the Configuration Register, follow these steps:
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-44 www.natinst.com Figure 2-17 shows the timing requirements on the SERCLK and SERDATIN signals. You must observe these timing requirements for all communications. T delay is a specification of the SCXI-1121. Figure 2-17. Serial Data T...
Page 61 - To read from the Module ID Register, follow these steps:
Chapter 2 Configuration and Installation © National Instruments Corporation 2-45 SCXI-1121 User Manual 3. Pull SLOT0SEL* low to deassert the SS* line and establish conditions for writing a new slot-select number to the Slot 0 Slot-Select Register. 4. If you are not selecting another slot, you should...
Page 62 - Figure 2-19 illustrates a read of the SCXI-1121 Module ID Register.; Programming
Chapter 2 Configuration and Installation SCXI-1121 User Manual 2-46 www.natinst.com Figure 2-19 illustrates a read of the SCXI-1121 Module ID Register. Figure 2-19. SCXI-1121 Module ID Register Timing Diagram For further details on programming these signals, refer to Chapter 5, Programming . SLOT0SE...
Page 63 - Functional Overview
© National Instruments Corporation 3-1 SCXI-1121 User Manual 3 Theory of Operation This chapter contains a functional overview of the SCXI-1121 module and explains the operation of each functional unit making up the SCXI-1121. Functional Overview The block diagram in Figure 3-1 illustrates the key f...
Page 64 - The major components of the SCXI-1121 are as follows:
Chapter 3 Theory of Operation SCXI-1121 User Manual 3-2 www.natinst.com The major components of the SCXI-1121 are as follows: • SCXIbus connector • Digital interface • Digital control circuitry • Timing and analog circuitry The SCXI-1121 consists of four isolated amplifier channels with gains of 1, ...
Page 65 - SCXIbus Connector; Figure 3-2 shows the pin assignments for the SCXIbus connector.
Chapter 3 Theory of Operation © National Instruments Corporation 3-3 SCXI-1121 User Manual SCXIbus Connector Figure 3-2 shows the pin assignments for the SCXIbus connector. Figure 3-2. SCXIbus Connector Pin Assignment A1B1A2B2A3B3A4B4A5B5A6B6A7B7A8B8A9B9A10B10A11B11A12B12A13B13A14B14A15B15A16B16A17B...
Page 66 - SCXIbus Connector Signal Descriptions
Chapter 3 Theory of Operation SCXI-1121 User Manual 3-4 www.natinst.com SCXIbus Connector Signal Descriptions Pin Signal Name Description A1, B1, C1, D1, A2, D2,A3, B3, C3, D3, A4, D4, A5, B5, C5, D5, A6, D6 GUARD Guard—Shields and guards the analog bus lines from noise. B2 AB0+ Analog Bus 0+ —Posit...
Page 68 - Digital Interface; 4 metral receptacle and to the data acquisition board via a 50-pin
Chapter 3 Theory of Operation SCXI-1121 User Manual 3-6 www.natinst.com chassis is being used), and then releasing INTR* high. At this point, SS* of the desired slot is asserted low and the data acquisition board can communicate with the module in that slot according to the SPI protocol. Digital Int...
Page 69 - Digital Control Circuitry
Chapter 3 Theory of Operation © National Instruments Corporation 3-7 SCXI-1121 User Manual Digital Control Circuitry Figure 3-4 diagrams the SCXI-1121 digital control. Figure 3-4. SCXI-1121 Digital Control The digital control section consists of the Configuration Register and the Module ID Register....
Page 70 - Analog and Timing Circuitry; Calibration; Figure 3-5 is a diagram of the analog input block.
Chapter 3 Theory of Operation SCXI-1121 User Manual 3-8 www.natinst.com 3. The serial data is available on MOSI and SPICLK clocks it into the register. 4. SS* goes high and D*/A goes high, indicating an end of communication. This action latches the Configuration Register bits. When the SCXIbus is re...
Page 72 - where G; is the overall gain and G; with; B W
Chapter 3 Theory of Operation SCXI-1121 User Manual 3-10 www.natinst.com The analog input consists of four isolated single-ended noninverting amplifiers. In addition, lowpass filtering is available at the inputs. You can jumper select one of two bandwidths, 10 kHz or 4 Hz. The amplifier gain is divi...
Page 73 - Excitation Output Channels; Configuration and
Chapter 3 Theory of Operation © National Instruments Corporation 3-11 SCXI-1121 User Manual After isolation, further filtering is available to increase the noise immunity of the amplifier channel. It is important to note that the overall amplifier bandwidth is determined by both filtering stages, so...
Page 74 - /4 W precision resistor with tempco less than; Offset Null Adjust; Follow these steps to null the offset of the amplifier channels:
Chapter 3 Theory of Operation SCXI-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 to 5 ppm, or an ammeter with the following specifications: – Accuracy: ±0.004% standard±0.016% sufficient – Range: 0.5 mA – Resolution: 6 1/2 digit...
Page 75 - Excitation Adjust
Chapter 3 Theory of Operation © National Instruments Corporation 3-13 SCXI-1121 User Manual 8. Adjust the input potentiometer of the channel of interest until the output is 0 ± 6 mV. 9. Go to the next channel. To avoid erroneous results when nulling the amplifier, follow these steps in the order ind...
Page 78 - Refer to the following
Chapter 3 Theory of Operation SCXI-1121 User Manual 3-16 www.natinst.com in the Configuration Register when SCANCON is high (inactive) and will count upwards on each rising clock edge when SCANCON is low (active). In the Parallel-Output Mode, the MUXCOUNTER is disabled and its output indicates binar...
Page 79 - Scanning Modes; Multiplexed Scanning
Chapter 3 Theory of Operation © National Instruments Corporation 3-17 SCXI-1121 User Manual Scanning Modes There are four basic types of scanning modes possible with the SCXI-1121—single-module parallel scanning, single-module multiplexed scanning, multiple-module multiplexed scanning, and multiple-...
Page 80 - Single-Module Multiplexed Scanning
Chapter 3 Theory of Operation SCXI-1121 User Manual 3-18 www.natinst.com entry. The list in Slot 0 will determine which module is being accessed and for how many samples. It is important that you make sure that the lists on the data acquisition board and Slot 0 are compatible so that the samples are...
Page 83 - Register Description; Register Description Format; Module ID Register
© National Instruments Corporation 4-1 SCXI-1121 User Manual 4 Register Descriptions This chapter describes in detail the SCXI-1121 Module ID Register, the Configuration Register, the Slot 0 registers, and multiplexer addressing. Note If you plan to use a programming software package such as NI-DAQ,...
Page 85 - Bit; CLKOUTEN; is placed in parallel with the
Chapter 4 Register Descriptions © National Instruments Corporation 4-3 SCXI-1121 User Manual Configuration Register The Configuration Register contains 16 bits that control the functions of the SCXI-1121. When SS* is asserted (low) and D*/A indicates data (low), the register will shift in the data p...
Page 86 - RTEMP
Chapter 4 Register Descriptions SCXI-1121 User Manual 4-4 www.natinst.com 9-8 CHAN<1..0> Channel Select—These bits determine the channel number (zero to three) that is loaded into the MUXCOUNTER to determine the analog channel to be read during a single read, or the starting channel on the mod...
Page 87 - Slot 0 Register Descriptions
Chapter 4 Register Descriptions © National Instruments Corporation 4-5 SCXI-1121 User Manual 0 FOUTEN* Forced Output Enable—This bit determines whether the module will drive the MCH0± pins on the rear signal connector with either the selected channel output or the MTEMP signal, depending on the stat...
Page 89 - Register Writes
Chapter 4 Register Descriptions © National Instruments Corporation 4-7 SCXI-1121 User Manual Hardscan Control Register (HSCR) The HSCR contains eight bits that control the setup and operation of the hardscan timing circuitry of Slot 0. To write to the HSCR, follow the procedure given in the Register...
Page 90 - SCANCONEN
Chapter 4 Register Descriptions SCXI-1121 User Manual 4-8 www.natinst.com 1 SCANCONEN Scan Control Enable—When set, this bit enables the SCANCON lines. When clear, all SCANCON lines are disabled (high). 0 CLKEN Clock Enable—When set, this bit enables TRIG0 as a clock for the hardscan circuitry. When...
Page 91 - FIFO Register; Don’t care bits—Unused.
Chapter 4 Register Descriptions © National Instruments Corporation 4-9 SCXI-1121 User Manual FIFO Register The FIFO Register is used to add entries to the Slot 0 FIFO. The FIFO contains the Slot 0 scan list. Each entry contains a slot number to be accessed, and a count number to determine the number...
Page 92 - Programming Considerations; Notation; For the bit patterns to be written, the following symbols are used:
© National Instruments Corporation 5-1 SCXI-1121 User Manual 5 Programming This chapter contains a functional programming description of the SCXI-1121 and Slot 0. Note If you plan to use a programming software package such as NI-DAQ, LabWindows, or LabVIEW with your SCXI-1121 board, you do not need ...
Page 93 - Register Selection and Write Procedure; SCXIbus
Chapter 5 Programming SCXI-1121 User Manual 5-2 www.natinst.com Register Writes This section describes how to write to the Configuration Register, HSCR, and FIFO Register including the procedure for writing to the Slot-Select Register to select the appropriate slot. For timing specifics, refer to th...
Page 94 - For each bit to be written to the Configuration Register:; Initialization
Chapter 5 Programming © National Instruments Corporation 5-3 SCXI-1121 User Manual 3. For each bit, starting with the MSB first (bit 15): a. SERDATIN = bit to be sent. These bits are the data that is being written to the Slot-Select Register. b. Clear SERCLK to 0. c. Set SERCLK to 1. This rising edg...
Page 95 - Single-Channel Measurements; Parallel Output; Multiplexed Output
Chapter 5 Programming SCXI-1121 User Manual 5-4 www.natinst.com to MCH0 through MCH3 on the rear signal connector. The module is disconnected from Analog Bus 0 and disabled from scanning. Single-Channel Measurements This section describes how to program the SCXI-1121, either alone or in conjunction ...
Page 96 - Indirect Measurements; Measurements from Other Modules
Chapter 5 Programming © National Instruments Corporation 5-5 SCXI-1121 User Manual To measure one of the four differential input channels to the SCXI-1121, perform the following steps: 1. Write the binary pattern 000XXXCC XX000000 to the SCXI-1121 Configuration Register. 2. Measure the voltage with ...
Page 97 - Measurements from the SCXI-1121 via Another Module
Chapter 5 Programming SCXI-1121 User Manual 5-6 www.natinst.com Measurements from the SCXI-1121 via Another Module To perform measurements via another module, you must cable the other module rear signal connector to a data acquisition board. The other module must also be able to transfer Analog Bus ...
Page 98 - Scanning Measurements; Perform all module programming.; Data Acquisition Board Setup Programming; Posttrigger Data Acquisition with Continuous Channel Scanning
Chapter 5 Programming © National Instruments Corporation 5-7 SCXI-1121 User Manual Scanning Measurements Programming for scanned data acquisition involves programming your data acquisition board, modules, and Slot 0. In general, the steps to be taken are as follows: 1. Perform all data acquisition b...
Page 100 - Counter 1 and SCANDIV
Chapter 5 Programming © National Instruments Corporation 5-9 SCXI-1121 User Manual Follow the instructions in these sections through the part labeled as follows: • Clear the A/D Circuitry and Reset the Mux Counter in the MIO board user manual (except for the AT-MIO-16X and the AT-MIO-64F-5). Do not ...
Page 101 - Module Programming
Chapter 5 Programming SCXI-1121 User Manual 5-10 www.natinst.com To program the MIO board to take N samples per data acquisition board scan list entry, perform the following additional programming steps at the end of the Enable the Scanning Data Acquisition Operation section in the appropriate data ...
Page 102 - Channel Scanning from Other Modules; Channel Scanning from the SCXI-1121 via Another Module
Chapter 5 Programming © National Instruments Corporation 5-11 SCXI-1121 User Manual Single-Module Multiplexed Scanning (Direct) To perform simple channel scanning, you must cable the SCXI-1121 to a data acquisition board. See Chapter 2, Configuration and Installation , for more information. To progr...
Page 103 - Configuration
Chapter 5 Programming SCXI-1121 User Manual 5-12 www.natinst.com 2. Program the other module not to drive Analog Bus 0, but to send Analog Bus 0 to the data acquisition board. Also program the other module to send a SCANCLK*-compatible signal to TRIG0. 3. Write the binary pattern 01S c XXXCC XX00111...
Page 104 - Programming the Slot 0 Hardscan Circuitry
Chapter 5 Programming © National Instruments Corporation 5-13 SCXI-1121 User Manual channel. See the Counter 1 and SCANDIV subsection of the 1. Data Acquisition Board Setup Programming section earlier in this chapter. You can use the MIO-16 boards in conjunction with the SCXI-1350 multichassis adapt...
Page 105 - Example 3
Chapter 5 Programming SCXI-1121 User Manual 5-14 www.natinst.com 5. Write binary 101S 1100 to the HSCR. 6. Write binary 101S 1110 to the HSCR. 7. Write binary 101S 1111 to the HSCR. In the preceding steps, S = 0 if you want the scanning to repeat when the end of the list is reached. S = 1 if you wan...
Page 106 - Scanning Examples; Example 1; Slot 0 scan list to the FIFO, consists of the following:; Example 2
Chapter 5 Programming © National Instruments Corporation 5-15 SCXI-1121 User Manual • Lab-NB User Manual – Program the sample-interval counter (Counter A0) – Service the data acquisition operation. Scanning Examples The following examples are intended to aid your understanding of module and Slot 0 p...
Page 109 - Specifications; Analog Input; Gain accuracy
© National Instruments Corporation A-1 SCXI-1121 User Manual A Specifications This appendix lists the specifications for the SCXI-1121. These are typical at 25 °C unless otherwise stated. The operating temperature range is 0 to 50 °C. Analog Input Gain (jumper-selectable) ........................ 1,...
Page 110 - Rise time
Appendix A Specifications SCXI-1121 User Manual A-2 www.natinst.com Filtering (jumper-selectable) ..................4 Hz (–10 dB) or 10 kHz (–3 dB), 3-pole RC Noise (400 kHz bandwidth) 1 Input (gain = 1,000) 4 Hz filter .................................100 nV rms 10 kHz filter .........................
Page 111 - RTD Mode; tolerance resistors; Cold-Junction Sensor; Accuracy
Appendix A Specifications © National Instruments Corporation A-3 SCXI-1121 User Manual RTD Mode Excitation current ................................... 0.15 mA ±0.04%, 0.45 mA ±0.2% Maximum load resistance ...................... 10 k Ω Drift ........................................................ 40...
Page 112 - Physical
Appendix A Specifications SCXI-1121 User Manual A-4 www.natinst.com Note You can find the temperature T (°C) as follows: T = T K – 273.15 where T K is the temperature in kelvin a = 1.288 x 10 –3 b = 2.356 x 10 –4 c = 9.556 x 10 –8 R T = resistance of the thermistor in Ω V TEMPOUT = output voltage of...
Page 118 - Further information is given in Chapter 3,
Appendix C SCXIbus Connector SCXI-1121 User Manual C-4 www.natinst.com Further information is given in Chapter 3, Theory of Operation . A24 TRIG0 TRIG0—General-purpose trigger line used by the SCXI-1121 to send SCANCLK to other modules or receive SCANCLK from other modules. Open collector. I/O. B24 ...
Page 122 - Further information is given in Chapter 2,
Appendix D SCXI-1121 Front Connector SCXI-1121 User Manual D-4 www.natinst.com Further information is given in Chapter 2, Configuration and Installation . C18 EX2– Negative Excitation Output 2—This pin is connected to the excitation channel 2 negative output. A20 CH2+ Positive Input Channel 2—This p...
Page 123 - SCXI-1180 feedthrough panel
© National Instruments Corporation E-1 SCXI-1121 User Manual E SCXI-1121 Cabling This appendix describes how to use and install the hardware accessories for the SCXI-1121: • SCXI-1340 cable assembly • SCXI-1341 Lab-NB, Lab-PC, and Lab-PC+ cable assembly • SCXI-1344 Lab-LC cable assembly • SCXI-1342 ...
Page 127 - Lab Board Pin
Appendix E SCXI-1121 Cabling © National Instruments Corporation E-5 SCXI-1121 User Manual jumper W1. Table E-2 lists the SCXI-1341 and SCXI-1344 pin translations. Note If you are using the Lab-PC+, configure the board for single-ended inputs. Table E-2. SCXI-1341 and SCXI-1344 Pin Translations Lab B...
Page 128 - Make sure that the computer and the SCXI chassis are turned off.
Appendix E SCXI-1121 Cabling SCXI-1121 User Manual E-6 www.natinst.com All other pins of the Lab board pinout are not sent to the SCXI-1121 rear signal connector. SCXI-1341 and SCXI-1344 Installation Follow these steps to install the SCXI-1341 or SCXI-1344: 1. Make sure that the computer and the SCX...
Page 129 - Rear Signal Connector Pin
Appendix E SCXI-1121 Cabling © National Instruments Corporation E-7 SCXI-1121 User Manual Table E-3. SCXI-1342 Pin Translations PC-LPM-16 Pin PC-LPM-16 Signal Rear Signal Connector Pin SCXI-1121 Use 1-2 AIGND 1-2 AOGND 3 ACH0 3 MCH0+ 4 ACH8 4 MCH0– 5 ACH1 5 MCH1+ 6 ACH9 6 MCH1- 7 ACH2 7 MCH2+ 8 ACH1...
Page 130 - Follow these steps to install the SCXI-1342:; SCXI-1180 Feedthrough Panel
Appendix E SCXI-1121 Cabling SCXI-1121 User Manual E-8 www.natinst.com All other pins of the PC-LPM-16 pinout are not sent to the SCXI-1121 rear signal connector. SCXI-1342 Installation Follow these steps to install the SCXI-1342: 1. Make sure that the computer and the SCXI chassis are turned off. 2...
Page 131 - Follow these steps to install the SCXI-1180:
Appendix E SCXI-1121 Cabling © National Instruments Corporation E-9 SCXI-1121 User Manual SCXI-1180 Installation Install the SCXI-1180 to the right of a slot that has an SCXI-1340, SCXI-1341, SCXI-1342, or SCXI-1344 cable assembly or an SCXI-1351 slot extender in its rear connector space. Follow the...
Page 132 - Connect the wires to the screw terminals.
Appendix E SCXI-1121 Cabling SCXI-1121 User Manual E-10 www.natinst.com Figure E-3. SCXI-1180 Front Panel Installation SCXI-1302 50-Pin Terminal Block The SCXI-1302 terminal block has screw terminal connections for the 50-pin connector on the SCXI-1180 feedthrough panel. SCXI-1302 Wiring Procedure T...
Page 133 - Snap the cover back in place.; Follow these steps to install the SCXI-1302:; Grounding
Appendix E SCXI-1121 Cabling © National Instruments Corporation E-11 SCXI-1121 User Manual 6. Snap the cover back in place. 7. Reinsert the rear grounding screw. The terminal block is now ready to be connected to the front panel connector. Figure E-4. Cover Removal SCXI-1302 Installation Follow thes...
Page 134 - Follow these steps to install the SCXI-1351:; SCXI-1350 Multichassis Adapter
Appendix E SCXI-1121 Cabling SCXI-1121 User Manual E-12 www.natinst.com SCXI-1351 One-Slot Cable Extender The SCXI-1351 cable extender is a miniature SCXI-1340 cable assembly. Instead of connecting to an MIO board 1 m away, the SCXI-1351 female rear connector connects to the male breakout connector ...
Page 135 - Follow these steps to install the SCXI-1350:
Appendix E SCXI-1121 Cabling © National Instruments Corporation E-13 SCXI-1121 User Manual The adapter board has a male rear connector, a female front connector, and a male chassis extender connector. You can attach the rear connector to a ribbon cable from the MIO board or a preceding chassis. You ...
Page 136 - SCXI-1343 Rear Screw Terminal Adapter; Rear Signal
Appendix E SCXI-1121 Cabling SCXI-1121 User Manual E-14 www.natinst.com SCXI-1343 Rear Screw Terminal Adapter You use the SCXI-1343 universal adapter to adapt custom wiring to the SCXI-1121. The SCXI-1343 has screw terminals for the analog output connections and solder pads for the rest of the signa...
Page 142 - NI Web Support; Online Problem-Solving and Diagnostic Resources
© National Instruments Corporation G-1 SCXI-1121 User Manual G Technical Support Resources This appendix describes the comprehensive resources available to you in the Technical Support section of the National Instruments Web site and provides technical support telephone numbers for you to use if you...
Page 143 - Software-Related Resources; Worldwide Support
Appendix G Technical Support Resources SCXI-1121 User Manual G-2 www.natinst.com Software-Related Resources • Instrument Driver Network—A library with hundreds of instrument drivers for control of standalone instruments via GPIB, VXI, or serial interfaces. You also can submit a request for a particu...
Page 144 - Prefix
© National Instruments Corporation Glossary-1 SCXI-1121 User Manual Glossary Prefix Meaning Value p- pico- 10 – 12 n- nano- 10 – 9 µ- micro- 10 – 6 m- milli- 10 – 3 k- kilo- 10 3 M- mega- 10 6 Numbers/Symbols ° degrees Ω ohms ε strain +5 V (signal) +5 VDC source signal A A amperes AB0+ positive anal...
Page 151 - Index; Numbers
© National Instruments Corporation Index-1 SCXI-1121 User Manual Index Numbers +5 V signal front connector (table), 2-18, D-3SCXIbus connector (table), 3-4 A AB0+ signal (table), 3-4, C-3AB0- signal (table), 3-4, C-3AB0EN bit, 4-4AC-coupled signal connections external resistor required, 2-21floating...
Page 152 - writing to Configuration Register,
Index SCXI-1121 User Manual Index-2 www.natinst.com C cable assemblies. See SCXI-1121 cabling.cables, custom, 1-5calibration, 3-11 to 3-14 equipment requirements, 3-11 to 3-12excitation adjust, 3-13 to 3-14offset null adjust, 3-11potentiometer reference designators (table), 3-14 CGND signal (table),...
Page 156 - SCXIbus to SCXI-1121 rear signal
Index SCXI-1121 User Manual Index-6 www.natinst.com SCXIbus to SCXI-1121 rear signal connector to DAQ board pin equivalences (table), 2-41 MTEMP signal (table), 2-18, D-3MTS mode, terminal blocks, 2-31 to 2-32multiple-chassis scanning programming, 5-12 to 5-13theory of operation, 3-20 multiplexed ou...
Page 158 - Slot 0 Register
Index SCXI-1121 User Manual Index-8 www.natinst.com timing diagram, 2-46 Slot 0 Register description, 4-5programming hardscan circuitry, 5-13 to 5-14 Slot-Select Register, 4-6 register writes, 5-2 to 5-4 RESET* signal (table), 3-4, C-3Revision A and B parts locator diagram detailed, F-3general, F-2 ...
Page 159 - trimmer potentiometer and corresponding
Index © National Instruments Corporation Index-9 SCXI-1121 User Manual SCXI-1343 rear screw terminal adapter, E-14 to E-16 SCXI-1344 Lab-PC+ cable assembly, E-4 to E-6 SCXI-1350 multichassis adapter, E-12 to E-13 SCXI-1351 one-slot cable extender, E-12 SCXI-1180 feedthrough panel, E-8 to E-10 descri...
Page 162 - Web support from National Instruments,
Index SCXI-1121 User Manual Index-12 www.natinst.com W Web support from National Instruments, G-1 to G-2 online problem-solving and diagnostic resources, G-1 software-related resources, G-2 Worldwide technical support, G-2Wxx jumpers. See jumpers.
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