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National Instruments SCXI-1100 User Manual

32-channel differential multiplexer/amplifier module for signal conditioning
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SCXI-1100
User Manual
32-Channel Differential Multiplexer/Amplifier Module for Signal Conditioning
October 1994 Edition
Part Number 320637C-01
© Copyright 1991, 1994 National Instruments Corporation.
All Rights Reserved.

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Summary of Contents for National Instruments SCXI-1100

  • Page 1 SCXI-1100 User Manual 32-Channel Differential Multiplexer/Amplifier Module for Signal Conditioning October 1994 Edition Part Number 320637C-01 © Copyright 1991, 1994 National Instruments Corporation. All Rights Reserved.
  • Page 2 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin, TX 78730-5039 (512) 794-0100 Technical support fax: (800) 328-2203 (512) 794-5678 Branch Offices: Australia (03) 879 9422, Austria (0662) 435986, Belgium 02/757.00.20, Canada (Ontario) (519) 622-9310, Canada (Québec) (514) 694-8521, Denmark 45 76 26 00, Finland (90) 527 2321, France (1) 48 14 24 24,...

  • Page 3: Limited Warranty

    Limited Warranty The SCXI-1100 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 defective during the warranty period. This warranty includes parts and labor.
  • Page 4 Any use or application of National Instruments products for or involving medical or clinical treatment must be performed by properly trained and qualified medical personnel, and all traditional medical safeguards, equipment, and procedures that are appropriate in the particular situation to prevent serious injury or death should always continue to be used when National Instruments products are being used.

  • Page 5: Table Of Contents

    Terminal Block Temperature Sensor ........2-19 Terminal Block Jumper Configuration ........2-19 Terminal Block Signal Connection .......... 2-20 Terminal Block Installation ............ 2-20 Rear Signal Connector ..................2-22 Rear Signal Connector Signal Descriptions ......... 2-23 © National Instruments Corporation SCXI-1100 User Manual...
  • Page 6 Direct Measurements ................5-3 Indirect Measurements ................. 5-4 Measurements from Other Modules ........5-4 Measurements from the SCXI-1100 via Another Module ..5-4 Scanning Measurements .................. 5-5 1. Data Acquisition Board Setup Programming........5-6 Counter 1 and SCANDIV ............5-7 2.
  • Page 7 Contents Single-Module Multiplexed Scanning (Indirect) ..... 5-8 Channel Scanning from Other Modules....... 5-8 Channel Scanning from the SCXI-1100 via Another Module ............5-8 Multiple-Module Multiplexed Scanning........5-9 Multiple-Chassis Scanning ............5-9 3. Programming the Slot 0 Hardscan Circuitry ........5-10 4.
  • Page 8 SCXI-1343 Rear Screw Terminal Adapter ..............E-13 SCXI-1343 Installation ..................E-13 Appendix F Revision A and B Photo and Parts Locator Diagram ........... F-1 Appendix G Customer Communication ..................... G-1 Glossary ........................Glossary-1 Index ..........................Index-1 SCXI-1100 User Manual viii © National Instruments Corporation...
  • Page 9 Figure 2-10. Slot-Select Timing Diagram ................2-27 Figure 2-11. Serial Data Timing Diagram ................2-28 Figure 2-12. Configuration Register Write Timing Diagram ..........2-29 Figure 2-13. SCXI-1100 Module ID Register Timing Diagram .......... 2-29 Figure 3-1. SCXI-1100 Block Diagram................3-1 Figure 3-2.
  • Page 10 User-Defined Current Receiver Resistors ............2-10 Table 2-8. Jumper Setting on the Terminal Block ............2-20 Table 2-9. SCXIbus to SCXI-1100 Rear Signal Connector to Data Acquisition Board Pin Equivalences ................... 2-25 Table 3-1. SCXIbus Equivalents for the Rear Signal Connector ........3-6 Table 3-2.

  • Page 11: About This Manual

    About This Manual This manual describes the electrical and mechanical aspects of the SCXI-1100 module and contains information concerning its operation and programming. The SCXI-1100 operates as a 32-channel differential input multiplexer with an onboard software-programmable gain instrumentation amplifier (PGIA). The SCXI-1100 is a member of the National Instruments Signal Conditioning eXtensions for Instrumentation (SCXI) Series modules for the National Instruments data acquisition plug-in boards.

  • Page 12: Conventions Used In This Manual

    • Appendix F, Revision A and B Photo and Parts Locator Diagram, contains a photograph of the Revision A and B SCXI-1100 and the parts locator diagram. • Appendix G, Customer Communication, contains forms you can use to request help from National Instruments or to comment on our products and manuals.

  • Page 13: Related Documentation

    SCXI-1000/1001 User Manual (part number 320423-01) Customer Communication National Instruments wants to receive your comments on our products and manuals. We are interested in the applications you develop with our products, and we want to help if you have problems with them. To make it easy for you to contact us, this manual contains comment and configuration forms for you to complete.

  • Page 14: Chapter 1 Introduction

    Chapter 1 Introduction This chapter describes the SCXI-1100; lists the contents of your SCXI-1100 kit; describes the optional software, optional equipment, and custom cables; and explains how to unpack the SCXI-1100 kit. The SCXI-1100 module operates as a fast 32-channel differential multiplexer with an onboard programmable gain instrumentation amplifier (PGIA).

  • Page 15: Optional Software

    Borland C++ for Windows. NI-DAQ software for DOS/Windows/LabWindows is on high- density 5.25 in. and 3.5 in. diskettes. You can use your SCXI-1100, together with your PC, AT, and MC Series data acquisition boards, with NI-DAQ software for DOS/Windows/LabWindows.

  • Page 16: Optional Equipment

    NB6 cable 0.5 m 181305-01 1.0 m 181305-10 Refer to the Signal Connections section in Chapter 2, Configuration and Installation, and to Appendix E, SCXI-1100 Cabling, for additional information on cabling, connectors, and adapters. © National Instruments Corporation SCXI-1100 User Manual...

  • Page 17: Custom Cables

    • Harting Electronik Inc. (part number 09-03-396-6921) The mating connector for the SCXI-1100 front connector is a 96-pin DIN C female connector. National Instruments uses a polarized connector to prevent inadvertent upside-down connection to the SCXI-1100. Recommended manufacturer part numbers for this mating connector are as follows: •...

  • Page 18: Configuration And Installation

    SCXI chassis, signal connections to the SCXI-1100, and cable wiring. Module Configuration Revision C and later SCXI-1100 modules contain 10 jumpers that are shown in the parts locator diagram in Figure 2-1. For the Revision A and B parts locator diagram, see Appendix F, Revision A and B Photo and Parts Locator Diagram.

  • Page 20: Digital Signal Connections

    This is the factory-default setting. In this setting, along with the proper setting of jumper W9, the data acquisition board can read the Module ID Register of the SCXI-1100. See the Timing Requirements and Communication Protocol section later in this chapter, and Chapter 4, Register Descriptions, for information on reading the Module ID Register.

  • Page 21: Jumper W9

    On Revision A and B modules, do not connect jumper W9. Using Jumpers W5 and W9 If the SCXI-1100 is not cabled to a data acquisition board, the positions of these jumpers do not matter, so leave them in their factory-default positions (both in position 1).

  • Page 22: Analog Configuration

    Communication Protocol section later in this chapter, and Chapter 5, Programming, for information on the use of the INTR* line. See Appendix E, SCXI-1100 Cabling, for the pin equivalences of the SCXI-1100 rear signal connector and the data acquisition board I/O connector.

  • Page 23: Grounding, Shielding, And Output Mode Selection

    Position AB-R2 enables the Pseudodifferential Output mode and connects the PGIA reference to the OUTREF pin on the rear signal connector. Select this mode when the SCXI-1100 has to operate with data acquisition boards that have a nonreferenced single-ended input (NRSE). Do not use differential input data acquisition boards when jumper W10 is in the AB-R2 position.

  • Page 24: Reference Mode Selection

    Jumper W1 references the negative (-) input of the PGIA to ground through a 100 k resistor. The SCXI-1100 is shipped with jumper W1 in the parking position. Use this setting when connecting to signals that are referenced to ground.

  • Page 25: Output Selection

    • W2 W3 W4 Note: The settling time varies greatly when you configure the SCXI-1100 to a 4 Hz or 10 kHz filter or full bandwidth. Refer to Appendix A, Specifications, for details on how fast you can scan in each case.

  • Page 26: Input Filtering And Current Loop Receivers

    In addition, pads are available for transforming individual channels to current-to-voltage converters. National Instruments manufactures an SCXI process-current pack, which consists of a package of four 249 , 0.1%, 5 ppm/ C, 1/4 W resistors. The part number for this kit is in the Optional Equipment section of Chapter 1, Introduction.

  • Page 27: Hardware Installation

    1. Turn off the computer that contains the data acquisition board or disconnect the data acquisition board from your SCXI chassis. 2. Turn off the SCXI chassis. Do not insert the SCXI-1100 into a chassis that is turned on. SCXI-1100 User Manual 2-10 ©...

  • Page 28: Signal Connections

    Chapter 2 Configuration and Installation 3. Insert the SCXI-1100 into the board guides. Gently guide the module into the back of the slot until the connectors make good contact. If you have already installed a cable assembly in the rear of the chassis, you must firmly engage the module and cable assembly; however, do not force the module into place.

  • Page 29: Figure 2-2. Scxi-1100 Front Connector Pin Assignment

    CH24- CH24+ OUTPUT CH25- CH25+ AOREF CH26- CH26+ GUARD CH27- CH27+ CGND CH28- CH28+ DTEMP CH29- CH29+ MTEMP CH30- CH30+ CGND CH31- CH31+ +5 V Figure 2-2. SCXI-1100 Front Connector Pin Assignment SCXI-1100 User Manual 2-12 © National Instruments Corporation...

  • Page 30: Front Connector Signal Descriptions

    Figure 2-3 illustrates how to connect a ground-referenced signal. Figure 2-4 illustrates how to connect a floating signal. Figure 2-5 shows how to connect AC-coupled signals. © National Instruments Corporation 2-13 SCXI-1100 User Manual...

  • Page 31: Figure 2-3. Ground-Referenced Signal Connection

    • • • • • Figure 2-3. Ground-Referenced Signal Connection PGIA – – – (Position 2-3) • • • 100 k • • • • • • Figure 2-4. Floating Signal Connection SCXI-1100 User Manual 2-14 © National Instruments Corporation...

  • Page 32: Figure 2-5. Ac-Coupled Signal Connection

    The SCXI-1100 PGIA can reject any voltage within its common-mode input range that ground potential differences between the signal source and the module introduce. In addition, the PGIA can reject common-mode noise pickup in the leads connecting the signal sources to the SCXI-1100.

  • Page 33: Thermocouple Connections

    SCXI-1100 CH- inputs to ground via a 100 k resistor. However, this setting usually increases settling time and common-mode noise. If you are using a grounded thermocouple, do not ground the SCXI-1100 CH- and do not use jumper W1 to ground floating signals because you will create a ground loop and adversely affect the accuracy of your measurement.

  • Page 34: Open Thermocouple Detection

    SCXIbus guard. Connector-and-Shell Assembly Two types of signal connectors are available to connect the signals to the SCXI-1100. The first, the SCXI-1310 96-pin connector-and-shell assembly, is available in a kit listed in the Optional Equipment section in Chapter 1, Introduction. The connector has eyelet ends for easy hook-and- solder wire connection.

  • Page 35: Figure 2-6. Assembling And Mounting The Connector-And-Shell Assembly

    12. Connect the connector-and-shell assembly to your module front connector and secure the assembly by tightening both mounting screws. Shell Assembly Mounting Screw Connector Jack Screws SCXI-1100 Module Lock Washers Shell Assembly Grounding Screw Mounting Screw Figure 2-6. Assembling and Mounting the Connector-and-Shell Assembly SCXI-1100 User Manual 2-18 © National Instruments Corporation...

  • Page 36: Scxi-1300 Terminal Block

    Configuration and Installation SCXI-1300 Terminal Block The second type of connector available to connect the signals to the SCXI-1100 inputs is the SCXI-1300 terminal block, which consists of a shielded board with 72 screw terminals to connect to the SCXI-1100 input connector. Thirty-two pairs of screw terminals are for signal connection to the 32 differential inputs of the SCXI-1100.

  • Page 37: Terminal Block Signal Connection

    To connect the terminal block to the SCXI-1100 front connector, perform the following steps: 1. Connect the SCXI-1100 front connector to its mating connector on the terminal block. 2. Make sure that the SCXI-1100 top and bottom thumbscrews do not obstruct the rear panel of the terminal block.

  • Page 39: Rear Signal Connector

    Chapter 2 Rear Signal Connector Note: If you will be using the SCXI-1100 with a National Instruments data acquisition board and cable assembly, you do not need to read the remainder of this chapter. If you will also be using the SCXI-1180 feedthrough panel, the SCXI-1343 rear screw terminal adapter, or the SCXI-1351 one-slot cable extender with the SCXI-1100, you should read this section.

  • Page 40: Rear Signal Connector Signal Descriptions

    MOSI is being sent to a module or Slot 0. SCANCLK Scan Clock – Indicates to the SCXI-1100 that the data acquisition board has taken a sample; also causes the SCXI-1100 to change channels.

  • Page 41: Analog Output Signal Connections

    2 are AOGND signal pins. AOGND is an analog output common signal that is routed through jumper W10 to the PGIA reference on the SCXI-1100. You can use these pins for a general analog power ground tie point to the SCXI-1100 if necessary. In particular, when using differential input data acquisition boards, such as the MIO boards, it is preferable to leave jumper W10 in its factory setting or in position AB-R1 to avoid ground loops.

  • Page 42: Table 2-9. Scxibus To Scxi-1100 Rear Signal Connector To Data Acquisition Board Pin Equivalences

    Chapter 2 Configuration and Installation The digital I/O signals of the SCXI-1100 match the digital I/O lines of the MIO board. When used with an SCXI-1341, SCXI-1342, or SCXI-1344 cable assembly, the SCXI-1100 signals match the digital lines of the Lab-NB/Lab-PC/Lab-PC+, PC-LPM-16, and Lab-LC boards, respectively.

  • Page 43: Timing Requirements And Communication Protocol

    Slot 11 in Chassis 9. Notice that the factory-default chassis address for the SCXI-1000 is address 0. For information on changing the address of your chassis, consult the SCXI-1000/1001 User Manual. An SCXI-1000 chassis responds to any chassis number. SCXI-1100 User Manual 2-26 © National Instruments Corporation...

  • Page 44: Figure 2-10. Slot-Select Timing Diagram

    Slot-Select Register to ensure that no accidental writes occur. Figure 2-11 shows the timing requirements on the SERCLK and SERDATIN signals. You must observe these timing requirements for all communications. T is a specification of the delay SCXI-1100. © National Instruments Corporation 2-27 SCXI-1100 User Manual...

  • Page 45: Figure 2-11. Serial Data Timing Diagram

    Figure 2-11. Serial Data Timing Diagram After the Slot-Select line to an SCXI-1100 has been asserted, you can write to the module Configuration Register and read from the Module ID Register using the following protocols. Deassert Slot-Select to reinitialize the contents of the Module ID Register. After the 32 bits of data are read from the Module ID Register, further data will be zeros until reinitialization occurs.

  • Page 46: Figure 2-12. Configuration Register Write Timing Diagram

    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 write zero to the Slot 0 Slot-Select Register. Figure 2-13 illustrates a read of the SCXI-1100 Module ID Register. SLOT0SEL* SERCLK...

  • Page 47: Chapter 3 Theory Of Operation

    Chapter 3 Theory of Operation This chapter contains a functional overview of the SCXI-1100 module and explains the operation of each functional unit making up the SCXI-1100. Functional Overview The block diagram in Figure 3-1 illustrates the key functional components of the SCXI-1100.

  • Page 48: Figure 3-2. Scxi-1100 Detailed Block Diagram

    Theory of Operation Chapter 3 Connector Signal Rear Connector SCXIbus Connector Front Figure 3-2. SCXI-1100 Detailed Block Diagram SCXI-1100 User Manual © National Instruments Corporation...

  • Page 49: Scxibus Connector

    PGIA with gains of 1, 2, 5, 10, 20, 50, 100, 200, 500, 1,000, and 2,000. The SCXI-1100 also has a digital section for automatic control of channel scanning, gain selection, amplifier output selection, MUXCOUNTER clock selection, calibration, and auto- zeroing.

  • Page 50: Figure 3-3. Scxibus Connector Pin Assignment

    GUARD GUARD GUARD AB2- AB2+ CHSGND CHSGND CHSGND CHSGND CHSGND RSVD INTR* RESET* MISO D*/A CHSGND CHSGND CHSGND CHSGND +5 V +5 V MOSI SPICLK TRIG0 SCANCON Figure 3-3. SCXIbus Connector Pin Assignment SCXI-1100 User Manual © National Instruments Corporation...

  • Page 51: Scxibus Connector Signal Descriptions

    Negative Analog Supply – -18.5 V to -25 V. A22, B22, C22 V+ Positive Analog Supply – +18.5 V to +25 V. A23, D23 +5 V +5 VDC Source – Digital power supply. © National Instruments Corporation SCXI-1100 User Manual...

  • Page 52: Table 3-1. Scxibus Equivalents For The Rear Signal Connector

    You must set jumper W5 to position 3 The SCXI-1100 module converts the data acquisition board signals to open-collector signals on the backplane of the SCXI chassis. For the data acquisition board to talk to a slot, the board must first assert the SS* for that slot.

  • Page 53: Digital Interface Circuitry

    Figure 3-4. Digital Interface Circuitry Block Diagram The digital interface circuitry is divided into a data acquisition section and an SCXIbus section. The SCXI-1100 connects to the SCXIbus via a 4x24 metral receptacle and to the data acquisition board via a 50-pin ribbon-cable header.

  • Page 54: Digital Control Circuitry

    (D*/A low). You use the Configuration Register for channel, gain, calibration, and auto-zeroing selection, in addition to configuring the SCXI-1100 for scanning options. All the control bits and the gain-select bits feed into a latch before being routed to the rest of the module.

  • Page 55: Analog And Timing Circuitry

    SCXI-1100 module ID is hex 00000006. Analog and Timing Circuitry The SCXIbus produces analog power ( 18.5 VDC) that is regulated on the SCXI-1100 to 15 VDC, a guard, analog buses (AB0 , AB2 ) and a chassis ground (CHSGND). AB0 buses the SCXI-1100 output to other modules or receives outputs from other modules via the SCXIbus.

  • Page 56: Figure 3-6. Analog Input And Timing Block Diagram

    The input multiplexer consists of eight CMOS analog input multiplexers and has 32 differential analog input channels. Input channels and multiplexers correspond as shown in Table 3-2. SCXI-1100 User Manual 3-10 © National Instruments Corporation...

  • Page 57: Table 3-2. Multiplexer/Input Channel Correspondence

    (inactive) and counts upwards on each rising clock edge when SCANCON is low (active). The instrumentation amplifier on the SCXI-1100 board fulfills two purposes. The PGIA converts a differential input signal into a single-ended signal with respect to the SCXI-1100 ground for input common-mode signal rejection. With this conversion, the module can extract the input analog signal from a common-mode voltage or noise before the data acquisition board samples and converts the signal.

  • Page 58: Calibration

    Auto-zeroing and auto-calibration are methods for nullifying error sources that compromise the quality of measurements. Auto-zeroing determines the amount of offset at the output of the SCXI-1100 at a given PGIA gain. You should perform auto-zeroing at the start of an experiment SCXI-1100 User Manual 3-12 ©...

  • Page 59: Analog Output Circuitry

    5 V. Inherently, the SCXI-1100 offsets and gain errors are small, as shown in Appendix A, Specifications; therefore, hardware calibration is not necessary and the software calibration procedure explained in the previous paragraph is adequate.

  • Page 60: Scanning Modes

    MCH0 on the rear signal connector directly connects to ACH0 and ACH8. Furthermore, you can bus the multiplexed output of the SCXI-1100 via switches to AB0 on the SCXIbus to other modules. When you use multiple modules, you can bus the outputs of the module via AB0 to the module that connects to the data acquisition board.

  • Page 61: Single-Module Multiplexed Scanning (Indirect)

    Figure 3-9. Single-Module Multiplexed Scanning (Direct) Single-Module Multiplexed Scanning (Indirect) In this mode, do not directly cable the SCXI-1100 to the data acquisition board. Instead, connect another module to the data acquisition board; the analog output of the SCXI-1100 is sent over Analog Bus 0, through the intermediate module, and then to the data acquisition board.

  • Page 62: Figure 3-11. Multiple-Module Multiplexed Scanning

    This keeps the chassis synchronized. Notice that you can only perform multiple- chassis scanning with the SCXI-1001 chassis and MIO boards. See Chapter 5, Programming, for more information on multiple-chassis scanning. See Appendix E, SCXI-1100 Cabling, for more information on the necessary cable accessories for multiple-chassis scanning.

  • Page 63: Register Descriptions

    SCXI-1100 Register Descriptions The SCXI-1100 has two registers. The Module ID Register is a 4-byte read-only register that contains the Module ID number of the SCXI-1100. The Configuration Register is a 24-bit write- only register that controls the functions and characteristics of the SCXI-1100.

  • Page 64: Module Id Register

    The bytes appear least significant byte first. Within each byte, data is sent out MSB first. Additional data transfers result in all zeros being sent on the MISO line. The Module ID Register is reinitialized to its original value each time the SCXI-1100 is deselected by the SS* signal on the backplane.

  • Page 65: Configuration Register

    SS* is asserted (low) and D*/A indicates data (low), the register shifts in the data present on the MOSI line, bit 23 first, and then latches it when the SCXI-1100 is deselected by the SS* signal on the backplane. The Configuration Register initializes to all zeros when the SCXI chassis is reset or first turned on.
  • Page 66 TRIG0. If CLKOUTEN is cleared to 0, SCANCLK* is not transmitted on TRIG0. CLKSELECT Scan Clock Select – Determines whether the SCXI-1100 uses SCANCLK or the inverted form of TRIG0 to clock the MUXCOUNTER for the purposes of scanning through the analog channels.
  • Page 67 SCANCON is active (low) and the SCANCONEN bit is cleared. If the PGIA or MTEMP is driving the output buffer, FOUTEN* drives Analog Bus 0 if AB0EN is set. If nothing is driving the output buffer, the SCXI-1100 output saturates. © National Instruments Corporation...

  • Page 68: Slot 0 Register Descriptions

    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. SCXI-1100 User Manual © National Instruments Corporation...

  • Page 69: Slot-Select Register

    Chassis Bit 4 through 0 – Determine which chassis is selected. On the SCXI-1000 chassis, these bits are don't cares. SL<3..0> Slot Bit 3 through 0 – Determine which slot in the selected chassis is selected. © National Instruments Corporation SCXI-1100 User Manual...

  • Page 70: Hardscan Control Register (Hscr)

    SCANCON lines. When cleared to 0, all SCANCON lines are disabled (high). CLKEN Clock Enable – When set to 1, enables TRIG0 as a clock for the hardscan circuitry. When cleared to 0, TRIG0 is disabled. SCXI-1100 User Manual © National Instruments Corporation...

  • Page 71: Fifo Register

    Count – The value of these bits plus one determines how many samples are 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-1100 User Manual...

  • Page 72: Chapter 5 Programming

    Binary one Don't care, either zero or one may be written One of five bits used to specify the gain of the SCXI-1100. See the bit descriptions in the Configuration Register section in Chapter 4, Register Descriptions, for more information.

  • Page 73: Register Selection And Write Procedure

    Programming Chapter 5 Table 5-1. SCXI-1100 Rear Signal Connector Pin Equivalences SCXIbus Line SCXI-1100 Rear MIO Boards Lab Boards PC-LPM-16 Signal Connector MOSI SERDATIN ADIO0 DOUT4 D*/A DAQD*/A ADIO1 DOUT5 INTR* SLOT0SEL* ADIO2 DOUT6 SPICLK SERCLK EXTSTROBE* DOUT7 MISO SERDATOUT...

  • Page 74: Initialization

    Direct Measurements To perform a direct measurement, you must cable the SCXI-1100 rear signal connector to a data acquisition board. See Chapter 2, Configuration and Installation, for more information. For information on how to make the voltage measurement with your data acquisition board, consult your data acquisition board user manual.

  • Page 75: Indirect Measurements

    To make a measurement from another module, perform the following steps: 1. Perform any necessary programming to ensure that no modules are driving Analog Bus 0. For an SCXI-1100, clear AB0EN in the Configuration Register to ensure that its output is not driving AB0.

  • Page 76: Scanning Measurements

    To measure the voltage on the MTEMP line, perform the following steps: 1. Perform any necessary programming to ensure that no modules are driving Analog Bus 0. For an SCXI-1100, clear AB0EN in the Configuration Register to ensure that its output is not driving AB0.

  • Page 77: Data Acquisition Board Setup Programming

    Multiple A/D Conversions with Interval Channel Scanning (Pseudo-Simultaneous) • NB-MIO-16X User Manual Multiple A/D Conversions with Continuous Channel Scanning (Round Robin) Multiple A/D Conversions with Interval Channel Scanning (Pseudo-Simultaneous) • NB-MIO-16 User Manual Programming Multiple A/D Conversions with Channel Scanning SCXI-1100 User Manual © National Instruments Corporation...

  • Page 78: Counter 1 And Scandiv

    MIO channel gain, the next five readings at another MIO gain, and so on. Notice, however, that it is best to apply gain to a signal on the SCXI-1100 rather than to amplify it later on the MIO board. Applying gain on the SCXI-1100 results in the SCXI chassis sending a high-level signal, which is less susceptible to noise than a low-level signal, to the MIO board.

  • Page 79: Module Programming

    This section describes the programming steps for various scanning possibilities. Single-Module Multiplexed Scanning (Direct) To perform simple channel scanning, cable the SCXI-1100 to a data acquisition board. See Chapter 2, Configuration and Installation, for more information. To program the module for scanned-channel measurements, write the binary pattern XXXGGGGG 10XCCCCC 00000101 to the SCXI-1100 Configuration Register.

  • Page 80: Multiple-Module Multiplexed Scanning

    TRIG0. If this module is an SCXI-1100, write the binary pattern XXXGGGGG 10XCCCCC 00000111 to its Configuration Register. Note: If this module is an SCXI-1100 and is not going to be scanned (it is being used only as an interface), write a 0 to bit 2 (SCANCONEN) in the Configuration Register.

  • Page 81: Programming The Slot 0 Hardscan Circuitry

    Program the 12 modules in the first chassis according to the steps listed in the previous Multiple-Module Multiplexed Scanning section, and program the 13th and 14th modules according to the Channel Scanning from the SCXI-1100 via Another Module section earlier in this chapter.

  • Page 82: Acquisition Enable, Triggering, And Servicing

    FIFO Register in Chapter 4, Register Descriptions. Example 1 You want to scan channels 3 through 9 at a gain of 1 on an SCXI-1100 in Slot 1 of an SCXI-1000 chassis. The SCXI-1100 is directly cabled to a data acquisition board.

  • Page 83: Example 2

    You want to scan channels 17 through 25 on the SCXI-1100 in Slot 1 at a gain of 1, channels 0 through 29 on the SCXI-1100 in Slot 4 at a gain of 50, and channels 28 through 7 on the SCXI-1100 in Slot 3 at a gain of 2,000.

  • Page 84: Example 3

    Programming Example 3 In this example, you want to scan 31 channels on an SCXI-1100 in Slot 4 of Chassis 1, then seven channels of an SCXI-1100 in Slot 11 of Chassis 2, three channels of an SCXI-1100 in Slot 3 of Chassis 3, and 25 channels of an SCXI-1100 in Slot 8 of Chassis 3.
  • Page 85 Programming Chapter 5 15. Toggle SLOT0SEL*. 16. Write XXXXX011 10011001 over MOSI. 17. Select Slot 0 in Chassis 0. SCXI-1100 User Manual 5-14 © National Instruments Corporation...

  • Page 86: Appendix A Specifications

    Appendix A Specifications This appendix lists the specifications for the SCXI-1100. These are typical at 25 C unless otherwise stated. The operating temperature range is 0 to 50 C. Analog Input Number of channels 32 differential Analog input range 10 V...

  • Page 87: Explanation Of Analog Input Specifications

    4.5 W Explanation of Analog Input Specifications Analog input range is the common and differential mode voltages that can be applied on the PGIA inputs without resulting in excessive distortion at the output. SCXI-1100 User Manual © National Instruments Corporation...

  • Page 88: Physical

    Operating Environment Temperature 0 to 50 C Relative humidity 5% to 90% at 35 C Storage Environment Temperature -55 to 150 C Relative humidity 5% to 90% noncondensing Located on the SCXI-1300 terminal block © National Instruments Corporation SCXI-1100 User Manual...

  • Page 89: Appendix B Rear Signal Connector

    Appendix B Rear Signal Connector This appendix describes the pinout and signal names for the SCXI-1100 50-pin rear signal connector, including a description of each connection. Figure B-1 shows the pin assignments for the SCXI-1100 rear signal connector. AOGND AOGND...

  • Page 90: Rear Signal Connector Signal Descriptions

    MOSI is being sent to a module or Slot 0. SCANCLK Scan Clock – Indicates to the SCXI-1100 that the data acquisition board has taken a sample; also causes the SCXI-1100 to change channels.

  • Page 91: Appendix Cscxibus Connector

    Appendix C SCXIbus Connector This appendix describes the pinout and signal names for the SCXI-1100 96-pin SCXIbus connector, including a description of each connection. Figure C-1 shows pinout of the SCXI-1100 SCXIbus connector. © National Instruments Corporation SCXI-1100 User Manual...

  • Page 92: Figure C-1. Scxibus Connector Pin Assignment

    GUARD GUARD GUARD AB2- AB2+ CHSGND CHSGND CHSGND CHSGND CHSGND RSVD RESET* INTR* D*/A MISO CHSGND CHSGND CHSGND CHSGND +5 V +5 V MOSI SPICLK TRIG0 SCANCON Figure C-1. SCXIbus Connector Pin Assignment SCXI-1100 User Manual © National Instruments Corporation...

  • Page 93: Scxibus Connector Signal Descriptions

    Negative Analog Supply – -18.5 V to -25 V. A22, B22, C22 V+ Positive Analog Supply – +18.5 V to +25 V. A23, D23 +5 V +5 VDC Source – Digital power supply. © National Instruments Corporation SCXI-1100 User Manual...
  • Page 94 Master-Out-Slave-In – Transmits data from the SCXIbus to the module. Open collector. I/O. TRIG0 TRIG0 – General-purpose trigger line that the SCXI-1100 uses 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.

  • Page 95: Scxi-1100 Front Connector

    Appendix D SCXI-1100 Front Connector This appendix describes the pinout and signal names for the SCXI-1100 front connector, including a description of each connection. Figure D-1 shows the pin assignments for the SCXI-1100 front connector. Signal Column Signal Number Name...

  • Page 96: Front Connector Signal Descriptions

    SCXI-1100 Front Connector Appendix D Front Connector Signal Descriptions Signal Name Description +5 V +5 VDC Source – Used to power the temperature sensor on the terminal block. 0.2 mA of source not protected. A2, A5, A16, CGND Chassis Ground – Tied to the SCXI chassis.

  • Page 97: Appendix Escxi-1100 Cabling

    Appendix E SCXI-1100 Cabling This appendix describes how to use and install the hardware accessories for the SCXI-1100: • SCXI-1340 cable assembly • SCXI-1341 Lab-NB/Lab-PC/Lab-PC+ cable assembly • SCXI-1342 PC-LPM-16 cable assembly • SCXI-1344 Lab-LC cable assembly • SCXI-1180 feedthrough panel •...

  • Page 98: Scxi-1340 Installation

    MIO board. • The SCXI-1340 rear panel gives both mechanical and electrical shielding. Table E-1 lists the pin equivalences of the MIO board and the SCXI-1100. Table E-1. SCXI-1100 and MIO Board Pinout Equivalences SCXI-1100 Rear Signal MIO Board...

  • Page 99: Scxi-1341 Lab-Nb, Lab-Pc, Or Lab-Pc+ And Scxi-1344 Lab-Lc Cable Assemblies

    The adapter board converts the signals from the Lab board I/O connectors to a format compatible with the SCXI-1100 rear signal connector pinout at the front connector of the SCXI-1341 or SCXI-1344. The adapter board also has an additional male breakout connector that provides the unmodified Lab board signals for use with an SCXI-1180 feedthrough panel or an SCXI-1181 breadboard module.

  • Page 100: Scxi-1341 And Scxi-1344 Installation

    +5 V 34-35 No Connect All other pins of the Lab board pinout are not sent to the SCXI-1100 rear signal connector. SCXI-1341 and SCXI-1344 Installation Perform the following steps to install the SCXI-1341 and SCXI-1344: 1. Make sure that the computer and the SCXI chassis are turned off.

  • Page 101: Scxi-1342 Pc-Lpm-16 Cable Assembly

    No Connect DOUT4 SERDATIN DOUT5 DAQD*/A DOUT6 SLOT0SEL* 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-1100 rear signal connector. © National Instruments Corporation SCXI-1100 User Manual...

  • Page 102: Scxi-1342 Installation

    The other end of the cable is divided into two 50-pin connectors. Use positions 1 through 50 on the NB5 cable to connect to the SCXI-1100. This connector has an MIO-16 compatible pinout; the pin equivalences of the MIO board on this connector and the SCXI-1100 are given in Table E-1 in the SCXI-1340 Cable Assembly section earlier in this chapter.

  • Page 103: Figure E-2. Nb5 Cable And Scxi-1351 Installation

    Step 5 50-Pin Female Connector to Next Slot Step 4 Step 3 NB5 Cable Positions SCXI-1100 Rear 1 through 50 Male Breakout Signal Connector Connector Mounting Bracket Figure E-2. NB5 Cable and SCXI-1351 Installation © National Instruments Corporation SCXI-1100 User Manual...

  • Page 104: Scxi-1180 Feedthrough Panel

    3. Thread the rear connector through the front of the chassis to the rear of the chassis. Attach the rear connector to the breakout connector of the adjacent cable assembly or slot extender, as shown in Figure E-3. SCXI-1100 User Manual © National Instruments Corporation...

  • Page 105: Figure E-3. Scxi-1180 Rear Connections

    If you are using the SCXI-1180 with an SCXI-1351 and an NB5 cable, connect the SCXI-1180 breakout connector to the female connector on the SCXI-1351. Place the SCXI-1180 to the left of the SCXI-1351 (looking at the front of the chassis). © National Instruments Corporation SCXI-1100 User Manual...

  • Page 106: Scxi-1302 50-Pin Terminal Block

    1. Unscrew the rear grounding screw on the back of the terminal block, as shown in Figure E-5. 2. With a flathead screwdriver, carefully pry the cover off the terminal block. 3. Insert each wire through the terminal block strain relief. SCXI-1100 User Manual E-10 © National Instruments Corporation...

  • Page 107: Scxi-1302 Installation

    4. Tighten the top and bottom captive screws on the back of the terminal block into the screw holes in the front panel to hold the SCXI-1302 securely in place. Check the installation. © National Instruments Corporation E-11 SCXI-1100 User Manual...

  • Page 108: Scxi-1351 One-Slot Cable Extender

    The adapter takes channel 0 from the front connector and sends it to channel 0 of the rear connector. The adapter also takes channels 0 through 6 on the chassis extender connector and maps them to channels 1 through 7, respectively, on the rear connector. SCXI-1100 User Manual E-12 © National Instruments Corporation...

  • Page 109: Scxi-1350 Installation

    You use the SCXI-1343 universal adapter to adapt custom wiring to the SCXI-1100. The SCXI-1100 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.

  • Page 110: Table E-4. Scxi-1343 Pin Connections

    Solder pad RSVD Solder pad No Connect Solder pad 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-1100 User Manual E-14 © National Instruments Corporation...

  • Page 111: Revision A And B Photo And Parts Locator Diagram

    Revision A and B Photo and Parts Locator Diagram This appendix contains a photograph of the Revision A and B SCXI-1100 and the parts locator diagram. Figure F-1 shows the Revision A and B SCXI-1100. Figure F-2 shows the parts locator diagram.

  • Page 113: Customer Communication

    Filling out a copy of the Technical Support Form before contacting National Instruments helps us help you better and faster. National Instruments provides comprehensive technical assistance around the world. In the U.S. and Canada, applications engineers are available Monday through Friday from 8:00 a.m. to 6:00 p.m.
  • Page 114 National Instruments for technical support helps our applications engineers answer your questions more efficiently. If you are using any National Instruments hardware or software products related to this problem, include the configuration forms from their user manuals. Include additional pages if necessary.
  • Page 115 Record the settings and revisions of your hardware on the line located to the right of each item. In addition, fill out the hardware and software configuration forms for the SCXI chassis and data acquisition board. Completing these forms accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.

  • Page 116: Austin, Tx

    Documentation Comment Form ___________________________________________________ National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: SCXI-1100 User Manual Edition Date: October 1994 Part Number: 320637C-01 Please comment on the completeness, clarity, and organization of the manual.
  • Page 117 (warning), 2-16 custom cables, 1-4 floating signal connection, 2-14 SCXI-1180 feedthrough panel ground-referenced signal description of, E-8 connection, 2-14 front panel installation, E-10 signal connections, 2-13 to 2-16 installation, E-8 to E-9 © National Instruments Corporation Index-1 SCXI-1100 User Manual...
  • Page 118 A-2 CLKEN bit, 4-8 current loop receivers, 2-9 to 2-10 CLKOUTEN bit, 4-4 customer communication, xiii, G-1 CLKSELECT bit, 4-4 CV/ZERO* bit, 4-4 CNT<3..0> bit, 4-9 cold-junction reference (CJR) included on SCXI-1100, 1-1 Index-2 © National Instruments Corporation...
  • Page 119 A-2 INTR* signal FOUTEN* bit, 4-5 buffering of SLOT0SEL* line, 2-3 front connector description of, 3-5, C-3 AC-coupled connection, 2-15 equivalent to SLOTSEL* signal, 3-6 analog input channels, 2-13 to 2-16 © National Instruments Corporation Index-3 SCXI-1100 User Manual...
  • Page 120 SERDATOUT signal, 3-6 MOD<3..0> bit, 4-9 Module ID Register description of, 4-2 digital control circuitry, 3-8 to 3-9 reading from, 2-29 timing diagram, 2-29 MOSI signal description of, 3-6, C-4 equivalent to SERDATIN signal, 3-6 Index-4 © National Instruments Corporation...
  • Page 121 5-1 correspondence, 3-11 rear signal connector pin overview, 3-9 equivalences, 5-2 block diagram of SCXI-1100, 3-1 register selection and write detailed block diagram of procedure, 5-2 to 5-3 SCXI-1100, 3-2 scanning examples, 5-11 to 5-14 digital control circuitry, 3-8 to 3-9...
  • Page 122 RESET* signal, 3-5, C-3 indirect, 3-15 Reset button, 5-3 scanning programming examples, resistors 5-11 to 5-14 installing, 2-10 SCXI-1100. See also operation user-defined current receiver of SCXI-1100. resistors, 2-10 contents of kit, 1-1 RSVD bit, 4-5, 4-8 definition of, xi...
  • Page 123 2-28 5-2 to 5-3 slot-select timing diagram, 2-27 SCXIbus equivalent, 3-6 timing requirements, 2-26 selecting slots, 2-26 to 2-29 SCXIbus connector signal descriptions, timing requirements, 2-28 3-5 to 3-6 © National Instruments Corporation Index-7 SCXI-1100 User Manual...
  • Page 124 3-14 to 3-15, 5-8 indirect, 3-15, 5-8 to 5-9 from other modules, 5-8 technical support, G-1 from SCXI-1100 via another module, temperature sensor of terminal block 5-8 to 5-9 connections, 2-19 to 2-20 SL<3..0> bit, 4-7...

  • Page 125: Glossary

    Celsius CAL/ENM* Calibration/Multiplexer Select bit CH#+ Positive Input Channel Number signal CH#- Negative Input Channel Number signal Chassis bit CGND Chassis Ground signal CHAN Channel Select bit CHSGND Chassis Ground signal © National Instruments Corporation Glossary-1 SCXI-1100 User Manual...
  • Page 126 Forced Output Enable bit Forced Retransmit bit Full Scale feet GAIN Gain Select bit GUARD Guard signal hexadecimal HSCR Hardscan Control Register HSRS* Hardscan Reset bit hertz input current leakage input current inches input-output SCXI-1100 User Manual Glossary-2 © National Instruments Corporation...
  • Page 127 MTEMP Multiplexed Temperature Sensor signal multiplexed temperature sensor NRSE nonreferenced single-ended (input) ONCE Once bit OUTPUT Output signal OUTREF Output Reference signal PGIA programmable gain instrumentation amplifier parts per million random-access memory © National Instruments Corporation Glossary-3 SCXI-1100 User Manual...
  • Page 128 TRIG0 Trigger 0 signal volts Positive Analog Supply signal Negative Anaolg Supply signal volts direct current virtual instrument volts in offset voltage volts out volts, root mean square watts SCXI-1100 User Manual Glossary-4 © National Instruments Corporation...

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