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National Instruments SCXI-1320 User Manual

National Instruments SCXI-1320 User Manual

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SCXI
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SCXI-1121 User Manual
SCXI-1121 User Manual
April 2010
373143A-01

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Summary of Contents for National Instruments SCXI-1320

  • Page 1 SCXI SCXI-1121 User Manual SCXI-1121 User Manual April 2010 373143A-01...
  • Page 2 Thailand 662 278 6777, Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545 For further support information, refer to the Technical Support Information document. To comment on National Instruments documentation, refer to the National Instruments Web site at and enter the Info Code ni.com/info...
  • Page 3 Instruments Corporation. National Instruments respects the intellectual property of others, and we ask our users to do the same. NI software is protected by copyright and other intellectual property laws. Where NI software may be used to reproduce software or other materials belonging to others, you may use NI software only to reproduce materials that you may reproduce in accordance with the terms of any applicable license or other legal restriction.
  • Page 4 Operation of this hardware in a residential area is likely to cause harmful interference. Users are required to correct the interference at their own expense or cease operation of the hardware. Changes or modifications not expressly approved by National Instruments could void the user’s right to operate the hardware under the local regulatory rules.

  • Page 5: Table Of Contents

    Front Connector Signal Descriptions ..............2-17 Analog Input Channels..............2-19 Excitation Channels ................2-21 Temperature Sensor Connection ............2-21 Connector-and-Shell Assembly ............2-22 SCXI-1320, SCXI-1328, and SCXI-1321 Terminal Blocks.....2-23 Rear Signal Connector..................2-36 Rear Signal Connector Signal Descriptions ............2-37 Analog Output Signal Connections...........2-38 Digital I/O Signal Connections ............2-39 Timing Requirements and Communication Protocol......2-40...
  • Page 6 Contents Chapter 3 Theory of Operation Functional Overview ..................... 3-1 SCXIbus Connector ..................3-3 SCXIbus Connector Signal Descriptions............3-4 Digital Interface......................3-6 Digital Control Circuitry ....................3-7 Analog and Timing Circuitry ..................3-8 Analog Input Channels..................3-8 Excitation Output Channels ................3-11 Calibration.......................
  • Page 7 Ground-Referenced Signal Connection with High Common-Mode Voltage ....................2-19 Figure 2-5. Floating Signal Connection Referenced to Chassis Ground for Better Signal-to-Noise Ratio ..............2-19 Figure 2-6. Floating AC-Coupled Signal Connection..........2-20 Figure 2-7. AC-Coupled Signal Connection with High Common-Mode Voltage...2-20 © National Instruments Corporation SCXI-1121 User Manual...
  • Page 8 Assembly....................2-23 Figure 2-9. Nulling Circuit ..................2-27 Figure 2-10. Shunt Circuit ..................2-28 Figure 2-11. SCXI-1320 Parts Locator Diagram............2-33 Figure 2-12. SCXI-1328 Parts Locator Diagram............2-34 Figure 2-13. SCXI-1321 Parts Locator Diagram............2-35 Figure 2-14. SCXI-1121 Rear Signal Connector Pin Assignment ......2-36 Figure 2-15.
  • Page 9 Nulling Resistors and Corresponding Channel ........2-25 Table 2-12. Jumper Settings of the Nulling Circuits ..........2-27 Table 2-13. Jumper Settings on the SCXI-1320 Terminal Block......2-31 Table 2-14. Jumper Settings on the SCXI-1328 Terminal Block......2-31 Table 2-15. Jumper Settings on the SCXI-1321 Terminal Block......2-32 Table 2-16.

  • Page 10: 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 eXtensions for Instrumentation (SCXI) Series for the National Instruments data acquisition plug-in boards. This board is...

  • Page 11: Related Documentation

    About This Manual italic Italic text denotes variables, emphasis, a cross-reference, or an introduction to a key concept. Italic text also denotes text that is a placeholder for a word or value that you must supply. Text in this font denotes text or characters that you should enter from the monospace keyboard, sections of code, programming examples, and syntax examples.

  • Page 12: Introduction

    Multiplexed-Output mode with all four channels multiplexed into a single data acquisition board channel. The SCXI-1121 operates with full functionality with National Instruments MIO-16 boards. The SCXI-1121 operates with full functionality with the Lab-PC+ board in single-chassis SCXI systems.

  • Page 13: What Your Kit Should Contain

    SCXI-1121 module 181700-01 SCXI-1121 User Manual 320426D-01 If your kit is missing any of the components, contact National Instruments. Optional Software This manual contains complete instructions for directly programming the SCXI-1121. You can order separate software packages for controlling the SCXI-1121 from National Instruments.
  • Page 14 You can also use the SCXI-1121, combined with the NB Series data acquisition boards, with NI-DAQ software for Macintosh. NI-DAQ software for Macintosh, which is shipped with all National Instruments Macintosh data acquisition boards, comes with language interfaces for MPW C, THINK C, Pascal, and Microsoft QuickBASIC. Any language that uses Device Manager Toolbox calls can access NI-DAQ software for Macintosh.

  • Page 15: Optional Equipment

    Introduction 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 terminal block 776573-28 SCXI-1330 32-pin connector-and-shell assembly 776573-30 SCXI-1340 cable assembly...

  • Page 16: Custom Cables

    Chapter 1 Introduction Custom Cables The SCXI-1121 rear signal connector is a 50-pin male ribbon-cable header. The manufacturer part number used by National Instruments for this header is as follows: • AMP Inc. (part number 1-103310-0) The mating connector for the SCXI-1121 rear signal connector is a 50-position polarized ribbon-socket connector with strain relief.

  • Page 17: Unpacking

    • Remove the module from the package and inspect the module for loose components or any other sign of damage. Notify National Instruments if the module appears damaged in any way. Do not install a damaged module into your SCXI chassis.

  • Page 18: Configuration And Installation

    SCXI-1121 into the SCXI chassis, signal connections to the SCXI-1121, and cable wiring. Module Configuration The SCXI-1121 contains 49 jumpers that are shown in the parts locator diagrams in Figures 2-1 and 2-2. © National Instruments Corporation SCXI-1121 User Manual...

  • Page 19: Figure 2-1. Scxi-1121 General Parts Locator Diagram

    Chapter 2 Configuration and Installation Figure 2-1. SCXI-1121 General Parts Locator Diagram SCXI-1121 User Manual ni.com...

  • Page 20: Figure 2-2. Scxi-1121 Detailed Parts Locator Diagram

    On Revision C or later modules, jumper W32 connects a pullup resistor to the SERDATOUT signal on the rear signal connector. – Jumper W33 configures the guard, the analog output ground, and enables the Pseudodifferential Reference mode. © National Instruments Corporation SCXI-1121 User Manual...

  • Page 21: Digital Signal Connections

    Chapter 2 Configuration and Installation – 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 through 3, respectively. –...

  • Page 22: Jumper W38

    If the SCXI-1121 is cabled to a data acquisition board, and there are multiple SCXI chassis cabled to that data acquisition board with ribbon cables (you are using SCXI-1350 multi-chassis adapters), leave jumper © National Instruments Corporation SCXI-1121 User Manual...

  • Page 23: Table 2-1. Digital Signal Connections, Jumper Settings

    Chapter 2 Configuration and Installation 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-1121 modules that are cabled to the data acquisition board has jumper W32 set to position 1.

  • Page 24: Analog Configuration

    W33 is in the AB-R0 position. Position AB-R1 connects the analog reference to the SCXIbus guard. Position A-R0R1 is the parking position and the factory setting. © National Instruments Corporation SCXI-1121 User Manual...

  • Page 25: Table 2-2. Jumper W33 Settings

    Chapter 2 Configuration and Installation Position AB-R2 enables the Pseudodifferential Reference mode and connects the analog reference to the OUTREF pin on the rear signal connector. Select this mode when the SCXI-1121 has to operate with data acquisition boards that have a nonreferenced single-ended (NRSE) input. It is not recommended to use differential-input data acquisition boards when jumper W33 is in the AB-R2 position.

  • Page 26: Input Channel Jumpers

    To determine the overall gain of a given channel use the following formula: Overall gain = First-stage gain × second-stage gain Table 2-4. Gain Jumper Positions Gain Setting Jumper Position First-stage A (factory setting) Second-stage D (factory setting) © National Instruments Corporation SCXI-1121 User Manual...

  • Page 27: Excitation Jumpers

    Chapter 2 Configuration and Installation 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 nonisolated section of the input channel. This permits a higher signal-to-noise ratio by eliminating the noise generated by the isolation amplifier.

  • Page 28: Table 2-6. Voltage And Current Mode Excitation Jumper Setup

    Table 2-7. Maximum Load per Excitation Channel Excitation Level Maximum Load 3.333 V 28 mA 10 V 14 mA © National Instruments Corporation 2-11 SCXI-1121 User Manual...

  • Page 29: Table 2-8. Excitation Level Jumper Selection

    Chapter 2 Configuration and Installation Table 2-7. Maximum Load per Excitation Channel (Continued) Excitation Level Maximum Load 0.150 mA 10 kΩ 0.450 mA 10 kΩ After selecting the excitation mode of operation desired—Voltage or Current—as described in the previous section, use Table 2-8 to set your SCXI-1121 for the level of operation.

  • Page 30: Table 2-9. Completion Network Jumpers

    Table 2-9. Completion Network Jumpers Disable Network Channel Jumpers Enable Completion (Factory Setting) W1 and W2 • • • • • • • • W17 and W18 • • • • • • • • © National Instruments Corporation 2-13 SCXI-1121 User Manual...

  • Page 31: Hardware Installation

    Chapter 2 Configuration and Installation Table 2-9. Completion Network Jumpers (Continued) Disable Network Channel Jumpers Enable Completion (Factory Setting) W27 and W28 • • • • • • • • W39 and W40 • • • • • • • •...

  • Page 32: Signal Connections

    SCXI-1121 board via the SCXI-1121 front connector and rear signal connector, and includes specifications and connection instructions for the signals given on the SCXI-1121 connectors. Use only National Instruments TBX Series cable assemblies with high-voltage TBX Series terminal blocks. Front Connector Figure 2-3 shows the pin assignments for the SCXI-1121 front connector.

  • Page 33: Figure 2-3. Scxi-1121 Front Connector Pin Assignment

    Chapter 2 Configuration and Installation Signal Column Signal Number Name Name CH0+ CH0– EX0– EX0+ EGND0 CH1+ CH1– EX1+ EX1– EGND1 CH2+ CH2– EX2+ EX2– EGND2 CH3+ CH3– EX3+ EX3– EGND3 RSVD SCAL RSVD +5 V MTEMP CGND DTEMP Figure 2-3. SCXI-1121 Front Connector Pin Assignment SCXI-1121 User Manual 2-16 ni.com...

  • Page 34: Front Connector Signal Descriptions

    3 negative input. EGND2 Excitation Ground 2—This pin connects to the excitation ground 2 via a 51 kΩ resistor. EX2+ Positive Excitation Output 2—This pin is connected to the excitation channel 2 positive output. © National Instruments Corporation 2-17 SCXI-1121 User Manual...
  • Page 35 Chapter 2 Configuration and Installation Signal Name Description EX2– Negative Excitation Output 2—This pin is connected to the excitation channel 2 negative output. CH2+ Positive Input Channel 2—This pin is connected to the input channel 2 positive input. CH2– Negative Input Channel 2—This pin is connected to the input channel 2 negative input.

  • Page 36: Analog Input Channels

    Figures 2-6 and 2-7 show how to connect AC-coupled signals. – – High – Module Figure 2-4. Ground-Referenced Signal Connection with High Common-Mode Voltage – – Module Figure 2-5. Floating Signal Connection Referenced to Chassis Ground for Better Signal-to-Noise Ratio © National Instruments Corporation 2-19 SCXI-1121 User Manual...

  • Page 37: Figure 2-6. Floating Ac-Coupled Signal Connection

    Chapter 2 Configuration and Installation – bias – Module Figure 2-6. Floating AC-Coupled Signal Connection – bias – High – Module Figure 2-7. AC-Coupled Signal Connection with High Common-Mode Voltage For AC-coupled signals, you should connect an external resistor from the positive input channel to the signal reference.

  • Page 38: Excitation Channels

    Exceeding the maximum input voltage rating (250 V between positive and negative terminals and between any terminal and earth ground) can damage the SCXI-1121, the SCXIbus, and the DAQ board. National Instruments is not liable for any damages or injuries resulting from such signal connections. Excitation Channels Four fully isolated excitation channels are available.

  • Page 39: Connector-And-Shell Assembly

    Chapter 2 Configuration and Installation Connector-and-Shell Assembly Two types of signal connectors are available to connect the transducers to the SCXI-1121 inputs. The first, the SCXI-1330 32-pin DIN C female connector-and-shell assembly, is available in a kit listed in the Optional Equipment section in Chapter 1, Introduction.

  • Page 40: Scxi-1320, Scxi-1328, And Scxi-1321 Terminal Blocks

    Grounding Screw Mounting Screw Figure 2-8. Assembling and Mounting the SCXI-1330 Connector-and-Shell Assembly 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 for easy connection.
  • Page 41 When using the terminal block with high common-mode voltages, you must Caution insulate your signal wires appropriately. National Instruments is not liable for any damages or injuries resulting from inadequate signal wire insulation. Caution If high voltages (≥42 V ) are present, you must connect the safety earth ground to the strain-relief tab.

  • Page 42: Table 2-10. Trimmer Potentiometer And Corresponding Channel

    Each channel has an independent nulling resistor. You can therefore mix your ranges to accommodate each channel requirement. Table 2-11 lists the nulling resistors and their corresponding channels. Table 2-11. Nulling Resistors and Corresponding Channel Channel Number Nulling Resistor © National Instruments Corporation 2-25 SCXI-1121 User Manual...
  • Page 43 Chapter 2 Configuration and Installation The value of all the nulling resistors on your terminal block is 39 kΩ. Notice that these resistors are socketed for easy replacement. These sockets best fit a 1/4 W resistor lead size. To determine your nulling range, use the following formula (refer to Figure 2-9 for visual help): null ±...

  • Page 44: Table 2-12. Jumper Settings Of The Nulling Circuits

    Nulling circuit of Channel 0 is enabled; factory setting Nulling circuit of Channel 0 is disabled Nulling circuit of Channel 1 is enabled; factory setting Nulling circuit of Channel 1 is disabled © National Instruments Corporation 2-27 SCXI-1121 User Manual...
  • Page 45 Chapter 2 Configuration and Installation Table 2-12. Jumper Settings of the Nulling Circuits (Continued) Jumper Position Description Nulling circuit of Channel 2 is enabled; factory setting Nulling circuit of Channel 2 is disabled Nulling circuit of Channel 3 is enabled; factory setting Nulling circuit of Channel 3 is disabled SCXI-1121 Shunt Calibration...
  • Page 46 Note Noisy environments require more samples for greater accuracy. The SCXI-1320 and SCXI-1321 temperature sensors output 10 mV/°C and have an accuracy of ±1 °C over the 0 to 55 °C temperature range. To determine the temperature, use the following formulas: T °C...
  • Page 47 In addition to the screw terminals, the terminal block has one jumper for configuring the onboard temperature sensor. When you set jumper W1 on the SCXI-1320 or SCXI-1328 (jumper W5 on the SCXI-1321) to the MTEMP position, the jumper connects the temperature sensor output to the...

  • Page 48: Table 2-13. Jumper Settings On The Scxi-1320 Terminal Block

    MTEMP position (the temperature sensor is disabled until the RTEMP bit in the Configuration Register selects the sensor). 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...

  • Page 49: Table 2-15. Jumper Settings On The Scxi-1321 Terminal Block

    To connect the safety earth ground to the strain-relief tab, run an earth ground wire in the cable from the signal source to the terminal block. National Instruments is not liable for any damages or injuries resulting from inadequate safety earth ground connections.
  • Page 50 Chapter 2 Configuration and Installation Figure 2-11 shows a parts locator diagram for the SCXI-1320 terminal block. Figure 2-12 shows a parts locator diagram for the SCXI-1328 terminal block. Figure 2-13 shows a parts locator diagram for the SCXI-1321 terminal block.
  • Page 51 Chapter 2 Configuration and Installation Figure 2-12. SCXI-1328 Parts Locator Diagram SCXI-1121 User Manual 2-34 ni.com...
  • Page 52 Make sure that the SCXI-1121 top and bottom thumbscrews do not obstruct the rear panel of the terminal block. Tighten the top and bottom screws on the back of the terminal block to hold it securely in place. © National Instruments Corporation 2-35 SCXI-1121 User Manual...

  • Page 53: Rear Signal Connector

    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 using the SCXI-1180 feedthrough panel, the SCXI-1343 rear screw terminal adapter, or the SCXI-1351 one-slot cable extender with the SCXI-1121, you should read this section.

  • Page 54: Rear Signal Connector Signal Descriptions

    MOSI and MISO lines. Refer to the Timing Requirements and Communication Protocol section later in this chapter for more detailed information on timing. RSVD Reserved. Note: All other pins are not connected. © National Instruments Corporation 2-37 SCXI-1121 User Manual...

  • Page 55: Analog Output Signal Connections

    Caution The SCXI-1121 analog outputs are not overvoltage-protected. Applying external voltages to these outputs can damage the SCXI-1121. National Instruments is not liable for any damages resulting from such signal connections. Note The SCXI-1121 analog outputs are short-circuit protected.

  • Page 56: Digital I/O Signal Connections

    SCXI-1344 cable assembly, the SCXI-1121 signals match the digital lines of the Lab-NB/Lab-PC/Lab-PC+/Lab-LC boards and the PC-LPM-16 board, respectively. Table 2-16 lists the equivalences. For more information, consult Appendix E, SCXI-1121 Cabling. © National Instruments Corporation 2-39 SCXI-1121 User Manual...

  • Page 57: Timing Requirements And Communication Protocol

    Chapter 2 Configuration and Installation Table 2-16. SCXIbus to SCXI-1121 Rear Signal Connector to Data Acquisition Board Pin Equivalences SCXI-1121 Rear Signal Lab-NB/Lab-PC SCXIbus Line Connector MIO-16 Lab-PC+/Lab-LC PC-LPM-16 MOSI SERDATIN ADIO0 DOUT4 D*/A DAQD*/A ADIO1 DOUT5 INTR* SLOT0SEL* ADIO2 DOUT6 SPICLK SERCLK...

  • Page 58: Communication Signals

    SCXI-1000 is address 0. For information on changing the address of your chassis, consult the SCXI Chassis User Manual. An SCXI-1000 chassis will respond to any chassis number. © National Instruments Corporation 2-41 SCXI-1121 User Manual...
  • Page 59 Chapter 2 Configuration and Installation SLOT0SEL* ss_dis SS*X Chassis Y SS*11 clk_wait Chassis 9 slot0sel*_wait SERCLK slot0sel*_wait SERDATIN Chassis ID = 9 Slot 11 ss_dis SLOT0SEL* low to SS* disabled 200 nsec maximum clk_wait SLOT0SEL* low to first rising edge on SERCLK 75 nsec minimum slot0sel*_wait Last rising edge on SERCLK to SLOT0SEL* high...
  • Page 60 SS* asserted low SERDATIN = don’t care DAQD*/A = 0 (indicates data will be written to Configuration Register) SLOT0SEL* = 1 SERCLK = 1 (and has not transitioned since SS* went low) © National Instruments Corporation 2-43 SCXI-1121 User Manual...
  • Page 61 Chapter 2 Configuration and Installation For each bit to be written: Establish the desired SERDATIN level corresponding to this bit. SERCLK = 0 SERCLK = 1. Clock the data. 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.
  • Page 62 3 = 0 delay 350 nsec maximum SS* high to SERDATOUT high Figure 2-19. SCXI-1121 Module ID Register Timing Diagram For further details on programming these signals, refer to Chapter 5, Programming. © National Instruments Corporation 2-45 SCXI-1121 User Manual...

  • Page 63: Theory Of Operation

    – Interface Control Excitation 0 – – • Timing • • • • Analog • • Output • Input channel 3 Stage – Excitation 3 – Temperature sensor Figure 3-1. SCXI-1121 Block Diagram © National Instruments Corporation SCXI-1121 User Manual...
  • Page 64 Chapter 3 Theory of Operation 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, 2, 5, 10, 20, 50, 100, 200, 500, 1,000, and 2,000, and four isolated excitation channels with voltage or current excitation.

  • Page 65: Scxibus Connector

    GUARD CHSGND CHSGND CHSGND CHSGND CHSGND RSVD RESET* INTR* MISO D*/A V– V– V– V– CHSGND CHSGND CHSGND CHSGND +5 V +5 V SPICLK MOSI TRIG0 SCANCON Figure 3-2. SCXIbus Connector Pin Assignment © National Instruments Corporation SCXI-1121 User Manual...

  • Page 66: Scxibus Connector Signal Descriptions

    Chapter 3 Theory of Operation SCXIbus Connector Signal Descriptions Signal Name Description A1, B1, C1, D1, A2, D2, GUARD Guard—Shields and guards the analog bus lines A3, B3, C3, D3, A4, D4, from noise. A5, B5, C5, D5, A6, D6 AB0+ Analog Bus 0+ —Positive analog bus 0 line.

  • Page 67: Table 3-1. Scxibus Equivalents For The Rear Signal Connector

    SS* for that slot. This is done by asserting INTR* low, writing a 16-bit number over MOSI corresponding to the desired slot (and chassis if an SCXI-1001 © National Instruments Corporation SCXI-1121 User Manual...

  • Page 68: Digital Interface

    Chapter 3 Theory of Operation 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 Interface Figure 3-3 shows a diagram of the SCXI-1121 and SCXIbus digital interface circuitry.

  • Page 69: Digital Control Circuitry

    Register Descriptions. Writes to the Configuration Register require the following steps: SS* goes low, enabling communication with the board. D*/A goes low, indicating that the information sent on the MOSI line is data. © National Instruments Corporation SCXI-1121 User Manual...

  • Page 70: Analog And Timing Circuitry

    Chapter 3 Theory of Operation The serial data is available on MOSI and SPICLK clocks it into the register. SS* goes high and D*/A goes high, indicating an end of communication. This action latches the Configuration Register bits. When the SCXIbus is reset, all bits in the Configuration Register are cleared.
  • Page 71 Input Channel 1 To Output – Stage – – Input Channel 2 To Output – Stage – – Input Channel 3 To Output – Stage – – MTEMP DTEMP Figure 3-5. Analog Input Block Diagram © National Instruments Corporation SCXI-1121 User Manual...
  • Page 72 Chapter 3 Theory of Operation 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 divided into two stages, a first stage providing gains of 1, 10, 50, and 100, and a second stage providing gains of 1, 2, 5, 10, and 20.

  • Page 73: Excitation Output Channels

    Installation. The excitation channels are isolated from each other and are independently configurable for voltage or current excitation. Calibration For information about calibrating the SCXI-1121, refer to the SCXI-1121 Calibration Procedure document. © National Instruments Corporation 3-11 SCXI-1121 User Manual...

  • Page 74: Analog Output Circuitry

    Chapter 3 Theory of Operation Analog Output Circuitry Figure 3-6 shows the SCXI-1121 analog output circuitry. SCXIbus Output Stage Switch Control Channel 0 MCH0+ Channel 1 Output Buffer Channel 2 Channel 3 MCH0– MTEMP MCH1+ From Channel 1 MCH1– Output Stage and MCH2+ From Hardware Scan Control...
  • Page 75 5 through 12. The SCXI-1121 outputs on the rear signal connector are short-circuit protected. Refer to the following Scanning Modes section for further details on how to scan the SCXI-1121 channels. © National Instruments Corporation 3-13 SCXI-1121 User Manual...

  • Page 76: Scanning Modes

    Configuration and Installation, Chapter 5, Programming, your data acquisition board manual, and your SCXI chassis user manual. If you need further information, contact National Instruments. Single-Module Parallel Scanning Single-Module parallel scanning is the simplest scanning mode. Directly cable the SCXI-1121 to the data acquisition board as shown in Figure 3-7.

  • Page 77: Single-Module Multiplexed Scanning

    The SCXI-1121 receives its MUXCOUNTER clock from TRIG0, which is sent by the intermediate module, as illustrated in Figure 3-9. Slot 0 operation is the same for direct connection scanning. © National Instruments Corporation 3-15 SCXI-1121 User Manual...

  • Page 78: Multiple-Module Multiplexed Scanning

    Chapter 3 Theory of Operation SCXI-1000 or SCXI-1001 Chassis SCANCON X TRIG0 Data Acquisition Board Cable Assembly SCANCLK Timing Output MCH0 Analog Input Other SLOT 0 Module SCXI-1121 SLOT X Analog Bus 0 Figure 3-9. Single-Module Multiplexed Scanning (Indirect) Multiple-Module Multiplexed Scanning In this mode, all the modules tie into Analog Bus 0, and SCANCON enables the output of their amplifiers.

  • Page 79: Multiple-Chassis Scanning

    Data Acquisition Board Cable Adapter Adapter Adapter Cable Assembly Cable Assembly Input Ch. N Assemblies Input Ch. 1 Input Ch. 0 Timing Output Chassis 1 Chassis 2 Chassis Chassis N Figure 3-11. Multiple-Chassis Scanning © National Instruments Corporation 3-17 SCXI-1121 User Manual...

  • Page 80: Register Descriptions

    The SCXI-1121 has two registers. The Module ID Register is a four-byte, read-only register that contains the Module ID number of the SCXI-1121. The Configuration Register is a 16-bit, write-only register that controls the functions and characteristics of the SCXI-1121. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 81 Chapter 4 Register Descriptions Module ID Register The Module ID Register contains the 4-byte module ID code for the SCXI-1121. This code number will be read as the first four bytes on the MISO line whenever the module is accessed. The bytes will appear least significant byte first.
  • Page 82 1, the shunt calibration switches on the SCXI-1321 are closed and an R is placed in parallel with the SCAL bridge between EX+ and CH+ on all four channels. 12–10, 7–6 X Don’t care bits. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 83 Chapter 4 Register Descriptions 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 module for a scanned data acquisition.

  • Page 84: Slot 0 Register Descriptions

    From the software perspective, only one Slot-Select Register exists in a system composed of multiple chassis. The HSCR and FIFO Register, on the other hand, are unique to each chassis and you must program them separately. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 85 Chapter 4 Register Descriptions Slot-Select Register The Slot-Select Register contains 16 bits that determine which module in which chassis will be enabled for communication when the SLOT0SEL* line is set to one. An SCXI-1000 chassis will select the appropriate module in its chassis, regardless of the chassis number written.
  • Page 86 When set, this bit has no effect. LOAD* Load—This bit, when clear, forces a loading of the Slot 0 sample counter with the output of the FIFO. When set, this bit has no effect. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 87 Chapter 4 Register Descriptions SCANCONEN Scan Control Enable—When set, this bit enables the SCANCON lines. When clear, all SCANCON lines are disabled (high). CLKEN Clock Enable—When set, this bit enables TRIG0 as a clock for the hardscan circuitry. When clear, TRIG0 is disabled.
  • Page 88 Count—The value of these bits plus one determines how many samples will be taken before the next scan list entry becomes active. A value of zero corresponds to one sample and a value of 127 corresponds to 128 samples. © National Instruments Corporation SCXI-1121 User Manual...

  • Page 89: Programming

    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 the © National Instruments Corporation SCXI-1121 User Manual...

  • Page 90: Register Selection And Write Procedure

    Programming Timing Requirements and Communication Protocol section in Chapter 2, Configuration and Installation. The rear signal connector pin equivalences to the different National Instruments data acquisition boards are given in Table 5-1. Refer to also Appendix E, SCXI-1121 Cabling. The Configuration Register, the FIFO Register, and the HSCR are write-only registers.
  • Page 91 Figure 2-18, Configuration Register Write Timing Diagram, which shows the proper write to configure an SCXI-1121 that is directly cabled to an MIO-16 for multiple-module multiplexed scanning with a start channel of 3. © National Instruments Corporation SCXI-1121 User Manual...

  • Page 92: Initialization

    Chapter 5 Programming Initialization The SCXI-1121 powers up with its Configuration register cleared to all zeros. You can force this state by an active low signal on the RESET* pin of the backplane connector. In the reset state, CH0 through CH3 are routed to MCH0 through MCH3 on the rear signal connector.

  • Page 93: Indirect Measurements

    Analog Bus 0 and allows Analog Bus 0 to drive MCH0 through the output buffer. Program the other module to drive Analog Bus 0 with the signal to be measured. Measure the voltage with the data acquisition board. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 94 Chapter 5 Programming 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 0 to the data acquisition board. Refer to Chapter 2, Configuration and Installation, for more information.

  • Page 95: Scanning Measurements

    Multiple A/D Conversions with Continuous Channel Scanning (Round Robin) – Multiple A/D Conversions with Interval Channel Scanning (Pseudosimultaneous) • AT-MIO-16F-5 User Manual – Posttrigger Data Acquisition with Continuous Channel Scanning – Posttrigger Data Acquisition with Interval Channel Scanning © National Instruments Corporation SCXI-1121 User Manual...
  • Page 96 Chapter 5 Programming • AT-MIO-16X User Manual – Continuous Channel Scanning Data Acquisition – Interval Channel Scanning Data Acquisition • AT-MIO-64F-5 User Manual – Continuous Channel Scanning Data Acquisition – Interval Channel Scanning Data Acquisition • Lab-LC User Manual – Programming Multiple A/D Conversions with Channel Scanning •...
  • Page 97 Because you can multiplex many SCXI-1121s in one chassis to one MIO board channel, often the simplest way to program the MIO board is to use only one data acquisition board scan list entry, and make N the total number © National Instruments Corporation SCXI-1121 User Manual...

  • Page 98: Module Programming

    Chapter 5 Programming of samples to be taken on all modules in one scan. Check your MIO board user manual for limitations in the data acquisition board scan list format. 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 acquisition board user manual:...
  • Page 99 10XXXXXX XX100011 Configuration Register. This step disables the SCXI-1121 from driving Analog Bus 0 and allows Analog Bus 0 to drive MCH0 through the output buffer. Program the other module to be scanned. © National Instruments Corporation 5-11 SCXI-1121 User Manual...
  • Page 100 Chapter 5 Programming Channel Scanning from the SCXI-1121 via Another Module To scan the SCXI-1121 via other modules, you must cable the other module to a data acquisition board and the other module must be able to transfer Analog Bus 0 to the data acquisition board. The other module must also be able to send a SCANCLK*-compatible signal on TRIG0.

  • Page 101: Programming The Slot 0 Hardscan Circuitry

    0000 0000 Write binary to the HSCR. 0000 1000 Write the Slot 0 scan list to the FIFO. Write binary to the HSCR. 0010 1100 Write binary to the HSCR. 101S 1100 © National Instruments Corporation 5-13 SCXI-1121 User Manual...
  • Page 102 Chapter 5 Programming Write binary to the HSCR. 101S 1110 Write binary to the HSCR. 101S 1111 To program the hardscan circuitry to use the current scan list, perform the following steps: Write binary to the HSCR. 0000 1000 Write binary to the HSCR.

  • Page 103: Acquisition Enable, Triggering, And Servicing

    1. Data Acquisition Board Setup Programming section of this chapter. Following the procedure given in the Register Writes section, write to the Configuration Register of the 10000001 00001101 SCXI-1121 in Slot 1. © National Instruments Corporation 5-15 SCXI-1121 User Manual...

  • Page 104: Example 2

    Chapter 5 Programming Follow the steps outlined in the 3. Programming the Slot 0 Hardscan Circuitry section earlier in this chapter, where step 3, Write the Slot 0 scan list to the FIFO, consists of the following: – Write to the FIFO Register. This 00000000 00000010 corresponds to Slot 1 for three samples.

  • Page 105: Example 3

    Write over MOSI. XXXXX001 10000011 Toggle SLOT0SEL*. Write over MOSI. XXXXX110 00000101 Select Slot 14 in Chassis 2. Write over MOSI. XXXXX110 00000011 Toggle SLOT0SEL*. Write over MOSI. XXXXX101 00000001 Toggle SLOT0SEL*. © National Instruments Corporation 5-17 SCXI-1121 User Manual...
  • Page 106 Chapter 5 Programming 10. Write over MOSI. XXXXX110 00000011 11. Select Slot 14 in Chassis 3. 12. Write over MOSI. XXXXX110 00000101 13. Toggle SLOT0SEL*. 14. Write over MOSI. XXXXX001 00000000 15. Toggle SLOT0SEL*. 16. Write over MOSI. XXXXX011 10000010 17.
  • Page 107 Normal ..........1 GΩ Power off......... 50 kΩ Overload.......... 50 kΩ Output resistance Multiplexed-Output mode....100 Ω Parallel-Output mode ...... 330 Ω Includes the combined effects of gain, offset, and hysteresis and nonlinearity. © National Instruments Corporation SCXI-1121 User Manual...

  • Page 108: Appendix A Specifications

    Appendix A Specifications Filtering (jumper-selectable) ....4 Hz (–10 dB) or 10 kHz (–3 dB), 3-pole RC Noise (400 kHz bandwidth) Input (gain = 1,000) 4 Hz filter .........100 nV 10 kHz filter ......4 µV Output (gain = 1) 4 Hz ..........150 µV 10 kHz ........1 mV Output selection time (with 5 V step, all gains) 0.012% accuracy......5.2 µsec typical,...
  • Page 109 SCXI-1320 terminal block. The excitation voltage values are measured at the output screw terminals of the SCXI-1320 terminal block. Because of the voltage drop in various portions of the circuit, the actual excitation voltage might vary slightly with the resistance of the cable and of the load.
  • Page 110 Appendix A Specifications where T is the temperature in kelvin ------------------------------------------------------------- - a = 1.288 × 10 –3 b = 2.356 × 10 –4 c = 9.556 × 10 –8 = resistance of the thermistor in Ω   TEMPOUT 50000 ------------------------------------- - ...
  • Page 111 For EMC compliance, operate this device with shielded cables. Note CE Compliance This product meets the essential requirements of applicable European Directives as follows: • 2006/95/EC; Low-Voltage Directive (safety) • 2004/108/EC; Electromagnetic Compatibility Directive (EMC) © National Instruments Corporation SCXI-1121 User Manual...
  • Page 112 At the end of the product life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers, National Instruments WEEE initiatives, and compliance with WEEE Directive 2002/96/EC on Waste Electrical and Electronic Equipment, visit ni.com/environment/weee National Instruments (RoHS) National Instruments RoHS ni.com/environment/rohs_china (For information about China RoHS compliance, go to ni.com/environment/rohs_china...

  • Page 113: Appendix B Rear Signal Connector

    31 32 33 34 DIG GND 35 36 SCANCLK 37 38 SERCLK 39 40 41 42 43 44 RSVD 45 46 47 48 49 50 Figure B-1. SCXI-1121 Rear Signal Connector Pin Assignment © National Instruments Corporation SCXI-1121 User Manual...
  • Page 114 Appendix B Rear Signal Connector Rear Signal Connector Signal Descriptions 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± Analog Output Channels 0 through 4—Connects to the data acquisition board differential analog input channels.

  • Page 115: Scxibus Connector

    SCXIbus Connector This appendix describes the pinout and signal names for the SCXI-1121 96-pin SCXIbus connector, including a description of each connection. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 116 Appendix C SCXIbus Connector Figure C-1 shows the pin assignments for the SCXI-1121 SCXIbus connector. GUARD GUARD GUARD GUARD GUARD GUARD AB0+ AB0– GUARD GUARD GUARD GUARD GUARD GUARD GUARD GUARD GUARD GUARD GUARD GUARD CHSGND CHSGND CHSGND CHSGND CHSGND RSVD RESET* INTR*...
  • Page 117 +5 VDC Source—Digital power supply. SPICLK Serial Peripheral Interface (SPI) Clock—Clocks the serial data on the MOSI and MISO lines. Open collector. I/O. MOSI Master-Out Slave-In—Transmits data from the SCXIbus to the module. Open collector. I/O. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 118 Appendix C SCXIbus Connector Signal Name Description 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. Slot Select—When low, enables module communications over the SCXIbus. Totem pole. Input. SCANCON Scanning Control—Combination output enable and reload signal for scanning operations.

  • Page 119: Scxi-1121 Front Connector

    SCXI-1121 Front Connector This appendix describes the pinout and signal names for the SCXI-1121 front connector, including a description of each connection. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 120 Appendix D SCXI-1121 Front Connector Figure D-1 shows the pin assignments for the SCXI-1121 front connector. Signal Column Signal Number Name Name CH0+ CH0– EX0+ EX0– EGND0 CH1+ CH1– EX1+ EX1– EGND1 CH2+ CH2– EX2+ EX2– EGND2 CH3+ CH3– EX3+ EX3–...
  • Page 121 3 negative input. EGND2 Excitation Ground 2—This pin connects to the excitation ground 2 via a 51 kΩ resistor. EX2+ Positive Excitation Output 2—This pin is connected to the excitation channel 2 positive output. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 122 Appendix D SCXI-1121 Front Connector Signal Name Description EX2– Negative Excitation Output 2—This pin is connected to the excitation channel 2 negative output. CH2+ Positive Input Channel 2—This pin is connected to the input channel 2 positive input. CH2– Negative Input Channel 2—This pin is connected to the input channel 2 negative input.

  • Page 123: Scxi-1121 Cabling

    The SCXI-1340 has strain relief so that you cannot accidentally disconnect the cable. • The SCXI-1340 includes a mounting bracket that mounts to the chassis so that you can remove and reinsert the module without explicitly © National Instruments Corporation SCXI-1121 User Manual...

  • Page 124: Table E-1. Scxi-1121 And Mio-16 Pinout Equivalences

    Appendix E SCXI-1121 Cabling removing the cable from the back of the chassis. This is especially useful when the SCXI chassis is rack mounted, making rear access difficult. • The SCXI-1340 has an extra male breakout connector for use with the SCXI-1180 feedthrough panel or additional modules or breadboards that need a direct connection to the MIO-16 board.
  • Page 125 If you will attach a cable to the breakout connector, installation is easiest if you attach the second cable before installing the SCXI-1340. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 126 Appendix E SCXI-1121 Cabling Rear Panel Mounting Bracket Connector Step 4 Step 5 50-Pin Female Connector to MIO-16 Board Step 3 Male Breakout Connector Step 4 SCXI-1121 Rear Signal Connector Mounting Bracket Figure E-1. SCXI-1340 Installation SCXI-1341 Lab-NB, Lab-PC, or Lab-PC+ and SCXI-1344 Lab-LC Cable Assembly The SCXI-1341 Lab-NB, Lab-PC, or Lab-PC+ cable assembly connects a Lab-NB, Lab-PC, or Lab-PC+ board to an SCXI-1121 module.

  • Page 127: Table E-2. Scxi-1341 And Scxi-1344 Pin Translations

    No Connect ACH7 No Connect AIGND 1–2 AOGND DAC0OUT No Connect AOGND No Connect DAC1OUT No Connect 13, 50 DGND 24, 33 DIG GND SERDATIN DAQD*/A SLOT0SEL* SERCLK SERDATOUT No Connect EXTCONV* SCANCLK © National Instruments Corporation SCXI-1121 User Manual...
  • Page 128 Appendix E SCXI-1121 Cabling Table E-2. SCXI-1341 and SCXI-1344 Pin Translations (Continued) Lab Board Pin Lab Board Signal SCXI-1121 Pin SCXI-1121 Signal OUTB1 No Connect +5 V 34–35 No Connect All other pins of the Lab board pinout are not sent to the SCXI-1121 rear signal connector.

  • Page 129: Table E-3. Scxi-1342 Pin Translations

    ACH13 No Connect ACH6 No Connect ACH14 No Connect ACH7 No Connect ACH15 No Connect 19, 50 DGND 24, 33 DIG GND DIN6 SERDATOUT DIN7 No Connect DOUT4 SERDATIN DOUT5 DAQD*/A DOUT6 SLOT0SEL* © National Instruments Corporation SCXI-1121 User Manual...
  • Page 130 Appendix E SCXI-1121 Cabling Table E-3. SCXI-1342 Pin Translations (Continued) PC-LPM-16 Pin PC-LPM-16 Signal Rear Signal Connector Pin SCXI-1121 Use DOUT7 SERCLK OUT2 No Connect +5 V 34–35 No Connect All other pins of the PC-LPM-16 pinout are not sent to the SCXI-1121 rear signal connector.
  • Page 131 Figure E-2. SCXI-1180 Rear Connections Screw in the rear panel to the threaded strip in the rear of the chassis. Screw the front panel into the front threaded strip, as shown in Figure E-3. Check the installation. © National Instruments Corporation SCXI-1121 User Manual...
  • Page 132 Appendix E SCXI-1121 Cabling Front Panel Connector Ribbon Cable to Rear and Breakout Connectors Step 5 Front Panel Front Threaded Strip 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.
  • Page 133 Tighten the top and bottom captive screws on the back of the terminal block into the screw holes in the front panel. This will hold the SCXI-1302 securely in place. Check the installation. © National Instruments Corporation E-11 SCXI-1121 User Manual...
  • Page 134 Appendix E SCXI-1121 Cabling 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 of a module that must be in the rear connector space of the slot to the left.
  • Page 135 SCXI-1121. The SCXI-1343 has screw terminals for the analog output connections and solder pads for the rest of the signals. A strain-relief clamp is on the outside of the rear panel. Table E-4 shows the SCXI-1343 pin connections. © National Instruments Corporation E-13 SCXI-1121 User Manual...

  • Page 136: Table E-4. Scxi-1343 Pin Connections

    Appendix E SCXI-1121 Cabling SCXI-1343 Installation Follow these steps to install the SCXI-1343: Insert each wire through the adapter strain-relief opening. Make all solder connections first. Connect the other wires to the screw terminals. Tighten the strain-relief screws to secure the wires. Plug the adapter board front connector to the module rear signal connector.
  • Page 137 Solder pad SERCLK Solder pad No Connect Solder pad No Connect Solder pad No Connect Solder pad No Connect Solder pad No Connect Solder pad RSVD Solder pad No Connect Solder pad © National Instruments Corporation E-15 SCXI-1121 User Manual...
  • Page 138 Appendix E SCXI-1121 Cabling Table E-4. SCXI-1343 Pin Connections (Continued) Rear Signal Connector Pin SCXI-1121 Use Connection Type No Connect Solder pad No Connect Solder pad No Connect Solder pad No Connect Solder pad No Connect Solder pad No Connect Solder pad SCXI-1121 User Manual E-16...

  • Page 139: Revision A And B Photo And Parts Locator Diagrams

    Figure F-1 shows the SCXI-1121 module. Figures F-2 and F-3 show the general and detailed parts locator diagrams of the Revision A and B SCXI-1121. Figure F-1. Revision A and B SCXI-1121 Signal Conditioning Module © National Instruments Corporation SCXI-1121 User Manual...
  • Page 140 Appendix F Revision A and B Photo and Parts Locator Diagrams SCXI-1121 User Manual ni.com...
  • Page 141 Appendix F Revision A and B Photo and Parts Locator Diagrams © National Instruments Corporation SCXI-1121 User Manual...
  • Page 142 0 line signal AB0EN analog bus 0 enable bit AB2– negative analog bus 2 line signal AB2+ positive analog bus 2 line signal ACH# data acquisition board analog input channel number © National Instruments Corporation SCXI-1121 User Manual...
  • Page 143 Glossary AOGND analog output ground signal Arms amperes, root mean square American Wire Gauge bandwidth Celsius CH#– negative input channel number signal CH#+ positive input channel number signal CHAN channel select bit chassis bit CHSGND chassis ground signal cold-junction reference CLKEN clock enable bit CLKOUTEN...
  • Page 144 EX#+ positive excitation output number signal Fahrenheit FIFO first-in-first-out FOUTEN* forced output enable bit forced retransmit bit GBWP gain bandwidth product GUARD guard signal hexadecimal HSCR hardscan control register © National Instruments Corporation SCXI-1121 User Manual...
  • Page 145 Glossary HSRS* hardscan reset bit hertz input/output input current leakage inches INTR* interrupt signal kelvin LOAD* load bit least significant bit meters megabytes of memory MCH#– negative analog output channel number signal MCH#+ positive analog output channel number signal MISO master-in slave-out signal module number bit MOSI...
  • Page 146 RESET* reset signal root mean square referenced single-ended (input) RSVD reserved bit/signal resistance temperature detector RTEMP read temperature bit referred to input referred to output RTSI real time system integration © National Instruments Corporation SCXI-1121 User Manual...
  • Page 147 Glossary SCAL (bit) shunt calibrate bit SCAL (signal) shunt calibration signal SCANCLK scan clock signal SCANCLKEN scan clock enable bit SCANCON scanning control signal SCANCONEN scan control enable bit SCXI Signal Conditioning eXtensions for Instrumentation (bus) software developer’s kit seconds SERCLK serial clock signal SERDATIN...
  • Page 148 Glossary Underwriters Laboratory volts V– negative analog supply signal positive analog supply signal volts direct current volts input high volts input low volts output high volts output low volts, root mean square watts © National Instruments Corporation SCXI-1121 User Manual...
  • Page 149 CLKSELECT, 4-3 excitation jumpers, 2-10 CNT<6..0>, 4-9 filter jumpers, 2-10 FOUTEN*, 4-4 gain jumpers, 2-9 FRT, 4-7 jumper W33, 2-7 HSRS*, 4-7 LOAD*, 4-7 ONCE, 4-7 RD, 4-7 RTEMP, 4-4 © National Instruments Corporation SCXI-1121 User Manual...
  • Page 150 Index SCAL, 4-3 configuration analog SCANCLKEN, 4-4 SCANCONEN, 4-4 excitation jumpers, 2-10 SL<3..0>, 4-6 filter jumpers, 2-10 gain jumpers, 2-9 grounding, shielding, and reference mode selection, 2-7 cable assemblies. See SCXI-1121 cabling input channel jumpers, 2-9 cables, custom, 1-5 jumper W33, 2-7 calibration certificate (NI resources), G-2 digital signal connections CGND signal (table), 2-17, D-3...
  • Page 151 2-40 jumper selection (table), 2-12 timing signals, 2-40 maximum load per excitation channel using jumpers W32 and W38, 2-5 (table), 2-11 direct measurements, single-channel multiplexed output, 5-4 parallel output, 5-4 single-channel measurements, 5-4 © National Instruments Corporation SCXI-1121 User Manual...
  • Page 152 5-5 excitation channels, 2-21 from SCXI-1121 via another module, 5-6 pin assignments (figure), 2-16, D-2 indirect multiplexed scanning, single-module SCXI-1320, SCXI-1328, and SCXI-1321 channel scanning from other terminal blocks, 2-23 modules, 5-11 signal descriptions (table), 2-17, D-3...
  • Page 153 2-3 SCXIbus equivalents for rear signal connector (table), 3-5 nulling circuit setting (table), 2-27 SCXIbus to SCXI-1121 rear signal SCXI-1320 terminal block connector to DAQ board pin (table), 2-31 equivalences (table), 2-40 SCXI-1328 terminal block module configuration. See configuration...
  • Page 154 SCXI-1121 National Instruments support and detailed, 2-3 services, G-1 general, 2-2 NI-DAQ software, 1-2 SCXI-1320 terminal block, 2-33 for Macintosh, 1-3 SCXI-1321 terminal block, 2-35 notation, for programming, 5-1 SCXI-1328 terminal block, 2-34 nulling circuitry, SCXI-1321 terminal block physical specifications, A-4...
  • Page 155 Module ID Register indirect measurements, 5-5 description, 4-2 multiplexed output, 5-4 overview, 3-8 parallel output, 5-4 reading from, 2-44 programming examples (NI resources), G-1 timing diagram, 2-45 programming languages, SCXI-1121 support for, 1-3 © National Instruments Corporation SCXI-1121 User Manual...
  • Page 156 Index Slot 0 Register single-module multiplexed scanning direct, 5-11 description, 4-5 programming hardscan indirect, 5-11 circuitry, 5-13 single-module parallel scanning, 5-11 Slot-Select Register Slot 0 hardscan circuitry, 5-13 description, 4-6 scanning modes register writes, 5-1 analog output circuitry, 3-12 related documentation, xii multiple-chassis scanning, 3-17 RESET* signal (table), 3-4, C-3 multiple-module multiplexed...
  • Page 157 Index SCXI-1343 rear screw terminal SCXI-1328 terminal block. See SCXI-1320 adapter, E-13 and SCXI-1328 terminal block SCXI-1344 Lab-PC+ cable assembly, E-4 SCXI-1340 cable assembly SCXI-1350 multichassis adapter, E-12 description, E-1 SCXI-1351 one-slot cable extender, E-12 installation, E-3 SCXI-1180 feedthrough panel...
  • Page 158 See also communication signals excitation channels, 2-21 description (table), 2-37, B-2 pin assignments (figure), 2-16, D-2 register writes, 5-1 SCXI-1320, SCXI-1328, and SCXIbus to SCXI-1121 rear signal SCXI-1321 terminal blocks, 2-23 connector to DAQ board pin signal descriptions (table), 2-17, D-3...
  • Page 159 2-29 terminal adapter. See SCXI-1343 rear screw user-configurable jumper, 2-3 terminal adapter terminal blocks. See SCXI-1302 50-pin terminal block; SCXI-1320 and SCXI-1328 terminal blocks; SCXI-1321 terminal block V– signal (table), 3-4, C-3 theory of operation V+ signal (table), 3-4, C-3...

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