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NI SCXI-1127 User Manual

32-channel high-voltage multiplexer/matrix module
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SCXI
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SCXI-1127 User Manual
32-Channel High-Voltage Multiplexer/Matrix Module
SCXI-1127 User Manual
January 1999 Edition
Part Number 322149A-01

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  • Page 1 SCXI ™ SCXI-1127 User Manual 32-Channel High-Voltage Multiplexer/Matrix Module SCXI-1127 User Manual January 1999 Edition Part Number 322149A-01...
  • Page 2 Internet Support E-mail: support@natinst.com FTP Site: ftp.natinst.com Web Address: http://www.natinst.com Bulletin Board Support BBS United States: 512 794 5422 BBS United Kingdom: 01635 551422 BBS France: 01 48 65 15 59 Fax-on-Demand Support 512 418 1111 Telephone Support (USA) Tel: 512 795 8248 Fax: 512 794 5678 International Offices Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20, Brazil 011 288 3336,...
  • Page 3 Important Information Warranty The SCXI-1127 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.
  • Page 4 Compliance FCC/DOC Radio Frequency Interference Class A Compliance This equipment generates and uses radio frequency energy and, if not installed and used in strict accordance with the instructions in this manual, may cause interference to radio and television reception. Classification requirements are the same for the Federal Communications Commission (FCC) and the Canadian Department of Communications (DOC).
  • Page 5 Conventions The following conventions are used in this manual. < > Angle brackets containing numbers separated by an ellipsis represent a range of values associated with a port, bit, or signal name (for example, ACH<0..7> stands for the signals ACH0 through ACH7). »...

  • Page 6: Table Of Contents

    Installing the Software ....................1-2 Installing the Hardware....................1-3 Installing the SCXI-1127 Module into the SCXI Chassis.......1-3 Connecting the SCXI-1127 to the NI-DMM in a Single Chassis System..1-4 Single 4-Slot Chassis Configuration ..........1-5 Single 12-Slot Chassis Configuration ..........1-7 Connecting the SCXI-1127 to the NI-DMM in a Multi-Chassis System..1-9 4-Slot and 4-Slot Multi-Chassis Configuration ........1-9...

  • Page 7: Specifications

    Appendix F Technical Support Resources Glossary Index Figures Figure 1-1. Installing the SCXI-1127 into an SCXI Chassis........1-3 Figure 1-2. 4-Slot Single Chassis Installation ............1-5 Figure 1-3. 4-Slot Configuration Parts Locator Diagram .......... 1-6 Figure 1-4. 12-Slot Single Chassis Installation ............1-7 Figure 1-5.
  • Page 8 Figure 2-10. Mixed Mode Scanning with an SCXI-1331 ..........2-11 Figure 2-11. Hardware Scanning Flowchart ..............2-13 Figure 2-12. Cabling an NI-DMM and Using the TRIG0 to Bus the VMC/EXT_TRIG_IN to Non-Cabled Modules........2-14 Figure 2-13. Cabling an External DMM ..............2-15 Figure 2-14.
  • Page 9 Contents Figure D-3. SCXI-1127 Front Connector Pin Assignments for Four-Wire Mode................F-4 Figure D-4. SCXI-1127 Front Connector Pin Assignments to Create an 8x4 Matrix ................F-5 Tables Table 1-1. SCXI-1127 Configuration............... 1-1 Table D-1. Front Connector Signal Description ............F-6 SCXI-1127 User Manual ©...

  • Page 10: Installing And Configuring The Scxi-1127

    32x1, two-wire multiplexer and several switch matrix configurations on an SCXI platform. The SCXI-1127 can also operate as two 16x1 or four 8x1, two-wire multiplexers allowing a single module to handle several multiplexing needs.

  • Page 11: Installing The Software

    At high voltages, the SCXI-1127 can handle signals up to 250 V at a 200 mA load and 30 VDC at a 1 A load. The SCXI-1127 complies with the CE low-voltage directive for an installation category II environment. Refer to Appendix A, Specifications, for detailed specifications of the SCXI-1127.

  • Page 12: Installing The Hardware

    You need the following items to complete the installation: • SCXI-1127 • SCXI chassis • 1/8 in. flathead screwdriver Follow these steps to install your SCXI-1127 module into the SCXI chassis while referring to Figure 1-1. 1 AB0+ 4 AB2+ 8 2-Slot HVAB-Backplane 2 AB0- 5 AB2-...

  • Page 13: Connecting The Scxi-1127 To The Ni-Dmm In A Single Chassis System

    When installing the SCXI-1127 module in an SCXI chassis, the rightmost slot (when the chassis is viewed from the front) must be filled first, then fill the slot to the left with the next SCXI-1127. Other SCXI modules can be loaded from left to right.

  • Page 14: Single 4-Slot Chassis Configuration

    Chapter 1 Installing and Configuring the SCXI-1127 test system. Before you proceed with your connections, make sure you turn off your SCXI chassis. Single 4-Slot Chassis Configuration Refer to Figure 1-2 and 1-3 to make connections in the single 4-slot chassis configuration.

  • Page 15: Figure 1-3. 4-Slot Configuration Parts Locator Diagram

    HVAB-backplane adapter behind it. Note An SCXI-1127 is required in slot 4 to establish communication with the chassis. If slot 4 is empty, the system will not operate. It is this module that you must specify in the configuration utility as the cabled module to the DMM.

  • Page 16: Single 12-Slot Chassis Configuration

    Chapter 1 Installing and Configuring the SCXI-1127 Single 12-Slot Chassis Configuration Refer to Figure 1-4 and 1-5 to make connections in the single 12-slot chassis configuration. SCXI-1127 Module 4 1-Slot HVAB-Backplane 6 NI 4060 for PCI 2 12-Slot SCXI Chassis...

  • Page 17: Figure 1-5. 12-Slot Configuration Parts Locator Diagram

    Do not connect the SH9MD-9MD cable to the AUX IN connector behind slot 4 on the 2-slot HVAB-backplane adapter. An SCXI-1127 is required in slot 12 to establish communications with the chassis. If slot 12 is empty, the system will not operate. It is this module that you must specify in the configuration utility as the cabled module to the DMM.

  • Page 18: Connecting The Scxi-1127 To The Ni-Dmm In A Multi-Chassis System

    Chapter 1 Installing and Configuring the SCXI-1127 Connecting the SCXI-1127 to the NI-DMM in a Multi-Chassis System The following sections describe how to configure the following multi-chassis configurations: • 4-slot and 4-slot multi-chassis configuration • 4-slot and 12-slot multi-chassis configuration •...

  • Page 19: Figure 1-6. 4-Slot To 4-Slot Multi-Chassis Configuration Parts Locator Diagram

    Chapter 1 Installing and Configuring the SCXI-1127 Refer to Figure 1-6 to setup this multi-chassis configuration. AB0+ AB0– AB2+ AB2– 1 2-Slot HVAB-Backplane 3 1-Slot HVAB-Backplane 6 SH9MD-9MD Cable Adapter Adapter 7 4-Slot SCXI Chassis 2 8-Position HVAB Plug 4 HV8-BAN4 Cable...

  • Page 20: 4-Slot And 12-Slot Multi-Chassis Configuration

    Repeat steps 1 through 3 for each additional chassis. Note An SCXI-1127 is required in slot 4 to establish communications with the chassis. If slot 4 is empty, the system will not operate. It is this module that you must specify in the configuration utility as the cabled module to the DMM.

  • Page 21: Parts Locator Diagram

    Chapter 1 Installing and Configuring the SCXI-1127 Refer to Figure 1-7 to setup this multi-chassis configuration. AB0+ AB0– AB2+ AB2– 1 2-Slot HVAB-Backplane 4 NI 4060 for PCI 8 12-Slot SCXI Chassis Adapter 5 SH9MD-9MD Cable 9 SH9MD-9MD Cable 2 1-Slot HVAB-Backplane...

  • Page 22: 12-Slot And 12-Slot Multi-Chassis Configuration

    Do not use the SH9MD-9MD cable behind slot 4 of the 2-slot HVAB-backplane adapter on the 12-slot chassis. An SCXI-1127 is required in slot 4 of the 4-slot chassis and slot 12 of the 12-slot chassis to establish communications with all the chassis in the system. If slot 4 is empty in the 4-slot chassis or slot 12 is empty in the 12-slot chassis, the chassis will not operate.

  • Page 23: Figure 1-8. 12-Slot To 12-Slot Multi-Chassis Configuration Parts Locator Diagram

    Chapter 1 Installing and Configuring the SCXI-1127 Refer to Figure 1-8 setup this multi-chassis configuration. AB0+ AB0– AB2+ AB2– 1 8-Slot HVAB-Backplane Adapter 4 2-Slot HVAB-Backplane 7 SH9MD-9MD Cable 2 HV8-BAN4 Cable Adapter 8 12-Slot SCXI Chassis 3 8-Position HVAB Plug...

  • Page 24: Connecting The Scxi-1127 To The Ni-Dmm In A Pxi-1010 Chassis

    Note Do not connect the SH9MD-9MD cable to the 2-slot HVAB-backplane adapter. An SCXI-1127 is required in slot 12 of each 12-slot chassis to establish communications with all the chassis in the system. If slot 12 is empty, the chassis will not operate.

  • Page 25: Ni-Dmm In Pxi Slot 4 Configuration

    4. Connect the SH9MD-9MD cable from the DMM to the AUX IN connector. You can install any additional SCXI-1127 modules in any slot that has an HVAB-backplane adapter behind it. NI-DMM in PXI Slot 4 Configuration To install your NI-DMM in slot 4 follow these steps: Install your NI-DMM in slot 4.
  • Page 26 Any non-SCXI-1127 modules should already be installed according to their installation instructions. To set up the SCXI-1127 module to be accessed by a DAQ device via another SCXI module, follow these steps while referring to Figure 1-9.

  • Page 27: Connecting The Scxi-1127 To An External Dmm

    Chapter 1 Installing and Configuring the SCXI-1127 Figure 1-9 shows the installation of the SCXI-1127 with two DAQ devices. 1 Non-SCXI-1127 Module 6 AB2+ 11 SCXI Chassis 2 MIO or DIO Device 7 AB2– 12 Digital Signals Connector 3 AB0+...
  • Page 28 Install the SCXI-1127s in the chassis and install the HVAB as described in one of the Connecting the SCXI-1127 backplane sections. To connect an SCXI-1127 to an external DMM device, you need two cables—the HV8-BAN4 or BAN2-BARE cable, and a cable to connect the handshaking lines from the SCXI-1127 to the DMM.

  • Page 29: Configuration And Self-Test

    Installing and Configuring the SCXI-1127 Configuration and Self-Test Run the Measurement & Automation Explorer to configure and test your SCXI-1127. If you need help during the configuration process, open the Measurement & Automation Help file by selecting Help Topics from the Help menu.

  • Page 30: Manually Adding Modules

    You can select any tab to see and/or change any attributes. Note For the SCXI-1127, the second tab allows you to configure the wire modes for each channel. The end of the pop-up list of channels allows you to select multiple channels.

  • Page 31: Safety Information

    You MUST insulate all of your signal connections appropriately to the HIGHEST available voltage with which the SCXI-1127 may come in contact. ANY voltage connected to the SCXI-1127 connector may appear on any other pin of this connector. Equipment described in this document must be used in an Installation Category II or lower environment per IEC 60664.
  • Page 32 Connections, including power signals to ground and vice versa, that exceed any of the maximum signal ratings on the SCXI-1127 can damage any or all of the modules connected to the SCXI chassis, the host computer, and the SCXI-1127 module.

  • Page 33: Using The Scxi-1127

    Using the SCXI-1127 This chapter discusses in detail the operation of the SCXI-1127. There are two major modes of operation—operation as a multiplexer and operation as a matrix. A third mode of operation, independent mode, allows you to access advanced features of the SCXI-1127.

  • Page 34: Figure 2-1. Scxi-1331 Signal Connections

    Chapter 2 Using the SCXI-1127 The SCXI-1331 terminal block consists of a shielded board with 84 screw terminals for easy connection to the SCXI-1127 input connector. The SCXI-1331 is shown in Figure 2-1. 1 Multiplexer Outputs 5 1-Wire Lo Reference...

  • Page 35: Two-Wire Channel Scanning Configuration

    If you are using a custom terminal block, you must provide this interlocking feature on your terminal block so that it is possible for the SCXI-1127 to detect that a terminal block is present. Please refer to Appendix D for information on how to do this.

  • Page 36: Figure 2-3. Two-Wire Wiring Diagram

    – SCXI-1127 Thermocouple Figure 2-3. Two-Wire Wiring Diagram You can connect different types of two-wire inputs to the SCXI-1127. For example, in Figure 2-3, a thermocouple (V ) is shown connected to channel 27, and on channel 5 (R ) and 24 (R ) resistance measurements are being made.

  • Page 37: One-Wire Channel Scanning Configuration

    The output of the 64-to-1 multiplexer is available through the OUT0+ and OUT0- screw terminals on the SCXI-1331. You can also connect the output of the SCXI-1127 to the HVAB backplane using switch AB0 to make the connection. On power up, switch AB0 is open, disconnecting the SCXI-1127 from the high-voltage bus.

  • Page 38: Four-Wire Channel Scanning Configuration

    You can use an SCXI-1127 as a 16-to-1 four-wire multiplexer. Figure 2-6 shows a block diagram of the input switching structure in four-wire mode. You can connect up to 16 four-wire channels to the SCXI-1127 using a SCXI-1331 terminal block. The four-wire multiplexer consists of dual 16-to-1 multiplexers.

  • Page 39: Figure 2-6. Four-Wire Block Diagram

    15B– SENSE Multiplexer Figure 2-6. Four-Wire Block Diagram When used with an NI-DMM for four-wire ohms measurement, the upper differential multiplexer provides the excitation source for the four-wire channel being scanned. The EXCITATION input to the upper multiplexer is available through the OUT0+ and OUT0- screw terminals on the SCXI-1331.

  • Page 40: Figure 2-7. Four-Wire Wiring Diagram

    Figure 2-7. Four-Wire Wiring Diagram On power up the AB0 and AB2 switches are open, disconnecting the SCXI-1127 from the high-voltage bus. If you are using this module with a high-voltage backplane, you need to close the AB0 and AB2 switches to connect the EXCITATION and SENSE commons to the HVAB backplane.

  • Page 41: Four-Wire Versus Two-Wire Resistance Measurement

    Chapter 2 Using the SCXI-1127 R2 is excited through the 1A + and - screw terminals and sensed via 1B + and - screw terminals. Note OUT0± and OUT2± are also referred to as COM0± in a four-wire configuration. Four-Wire versus Two-Wire Resistance Measurement...

  • Page 42: Mixed Mode Configuration

    Mixed Mode Configuration The input mode of the SCXI-1127 is configurable on a per channel basis, therefore you can connect a variety of signal types in two-wire, one-wire, and four-wire modes to the same module. An SCXI-1127 can have...

  • Page 43: Hardware And Software Scanning

    Hardware and Software Scanning The SCXI-1127 provides a very flexible scanning architecture. You can scan the channels randomly and can have multiple input modes in the same scan. This is useful for connecting multiple sensor types to one module.

  • Page 44: Hardware Timed Scanning

    This is called synchronous scanning. Note When using an NI-DMM with the SCXI-1127, synchronous mode is the only mode in which the NI-DMM and the SCXI-1127 operate. Another hardware timed scanning method is called handshaking. While...

  • Page 45: Figure 2-11. Hardware Scanning Flowchart

    Reset The channel scan list is downloaded to SCXI-1127. The first channel in the scan list is selected. The SCXI-1127 is now armed to respond to triggers on EXT_TRIG_IN. Stay at the selected channel in the scan list. EXT_TRIG_IN pulsed?
  • Page 46 Each interval must be at least 10 ms to guarantee that the switch has fully settled before the next measurement is taken. For example, you can connect the VMC of your DMM to the SCXI-1127 via a screw SCXI-1127 User Manual 2-14 ©...

  • Page 47: Figure 2-13. Cabling An External Dmm

    SCANADVD output trigger back to the DMM. For example, you can connect the VMC of the DMM to the SCXI-1127 via a screw terminal labeled EXT_TRIG_IN on the SCXI-1331 terminal block.

  • Page 48: Software Scanning

    SCXI-Module SCXI-1127 Trig 0 (Backplane) Trig 2 (Backplane) Figure 2-15. Connecting an External DMM to an SCXI-1127 in an SCXI-2000 Series Chassis Software Scanning Unlike hardware scanning, software scanning does not use hardware-generated triggers. In software scanning, a list of channels kept...

  • Page 49: Making Temperature Measurements

    NI-SWITCH documentation for more information on software scanning. Making Temperature Measurements You can use the SCXI-1127 to measure a variety of temperature devices including thermocouples, RTDs, and thermistors. The following sections discuss how to use these types of sensors with the SCXI-1127.
  • Page 50 In LabVIEW, you can use the Convert Thermistor Reading virtual instrument (VI) in the Data Acquisition»Signal Conditioning palette. If you are using LabWindows/CVI or NI-DAQ, use the function. Thermistor_Convert The VI takes the output voltage of the temperature sensor, the reference voltage, and the precision resistance and returns the thermistor temperature.

  • Page 51: Making Rtd Measurements

    When the switch is closed, the row is connected to the column. Figure 2-17 depicts a one-wire matrix; the SCXI-1127 is a two-wire matrix. The switching method for a two-wire matrix remains the same. A two-wire matrix is shown in ©...

  • Page 52: 32X1 Matrix Configuration

    Figure 2-17. 4x2 One-Wire Matrix Configuration 32x1 Matrix Configuration You can use the SCXI-1127 with the SCXI-1331 to make various matrix configurations such as a 32x1, 32 columns by one row, matrix. OUT0± (COM0±) provide the row signals on the SCXI-1331 terminal block. Screw terminals for two-wire channel 0 provide access to column 0 of the 32x1 matrix.

  • Page 53: 8X4 Matrix Configuration

    (C0...C7) and four pairs for accessing four rows (R0...R3) of the 8x4 matrix when installed in the front connector of the SCXI-1127. In addition to the screw terminals, the SCXI-1332 has six connectors for matrix expansion. Four of ©...

  • Page 54: Figure 2-19. Scxi-1332 Terminal Block

    6 Safety Ground Solder Lug Figure 2-19. SCXI-1332 Terminal Block The SCXI-1127 installed with the SCXI-1332 provides you with an 8x4 matrix without any extra wiring except for hooking up your signals to the columns and rows of the matrix. Refer to...

  • Page 55: Figure 2-20. Scxi-1332 Connected To An Scxi-1127

    Figure 2-21 shows a schematic of this application. Power Supply – Load Resistors SCXI-1127 – Figure 2-20. SCXI-1332 Connected to an SCXI-1127 © National Instruments Corporation 2-23 SCXI-1127 User Manual...

  • Page 56: Matrix Expansion

    Power Supply – – Figure 2-21. SCXI-1332 Connected to an SCXI-1127 Schematic Matrix Expansion You can build matrices larger than 8x4 by using multiple SCXI-1127s. You can build these larger matrices using row and column expansion of the 8x4 matrix. An example of row expansion is an 8x8 matrix. A 16x4 matrix is an example of a column expansion.

  • Page 57: Figure 2-22. 8X8 Matrix Parts Locator Diagram

    Chapter 2 Using the SCXI-1127 1 SCXI-1127/1332 #1 2 Matrix Expansion Cables 3 SCXI-1127/1332 #2 Figure 2-22. 8x8 Matrix Parts Locator Diagram © National Instruments Corporation 2-25 SCXI-1127 User Manual...

  • Page 58: Figure 2-23. 8X8 Matrix Schematic

    Chapter 2 Using the SCXI-1127 SCXI-1127/SCXI-1332 #1 Terminal Block Boundary R4 (R0) R5 (R1) R6 (R2) R7 (R3) SCXI-1127/SCXI-1332 #2 Figure 2-23. 8x8 Matrix Schematic To make a larger matrix, such as a 16x8 matrix, 16 columns by 8 rows, you must make both column and row expansions.

  • Page 59: Figure 2-24. 16X8 Matrix Parts Locator Diagram

    Chapter 2 Using the SCXI-1127 Expand the rows to the target number, 8 in this case, by connecting the columns of the appropriate number of 16x4 matrix blocks, two in this case, using matrix expansion cables. Figure 2-24 shows four SCXI-1332s connected to form a 16x8 matrix.

  • Page 60: Figure 2-25. 16X8 Matrix Schematic

    Chapter 2 Using the SCXI-1127 Figure 2-25 shows the schematic of the 16x8 matrix shown in Figure 2-24. Terminal Block Boundary SCXI-1127/SCXI-1332 #1 SCXI-1127/SCXI-1332 #3 Cable #2 R4 (R0) R5 (R1) Cable #1 R6 (R2) R7 (R3) SCXI-1127/SCXI-1332 #2 SCXI-1127/SCXI-1332 #4 Figure 2-25.

  • Page 61: Independent Mode

    Independent Mode The SCXI-1127 powers up in independent mode. In this mode, you can close or open any switch on the module via NI-SWITCH to the SCXI-1127. All software-controllable switches are shown in Figure 2-26. You can use the independent mode for advanced switching or scanning needs. You can control these switches using NI-SWITCH.

  • Page 62: Figure 2-26. Scxi-1127 Relay Configuration

    Front Connector HVAB3+ Relay COM2+ HVAB3– CH+ (16:23) Channel CH– (16:23) COM2– Bank 3 BC23 CH16+/– – CH23+/– OUT3 Return to Front Connector COM3+ Relay CH+ (24:31) Channel COM3– CH– (24:31) Bank 4 CH24+/– – CH31+/– Figure 2-26. SCXI-1127 Relay Configuration...

  • Page 63: Input Characteristics

    Specifications This appendix lists the specifications for the SCXI-1127 modules. These specifications are typical at 25° C unless otherwise noted. Input Characteristics Number of relays available as channels ..........32 Common-mode voltage Channel to channel......250 V or DC Channel to earth ......250 V or DC Maximum allowed voltage—differential mode or single-ended...
  • Page 64 100,000 Trigger Characteristics Scanner advanced pulsewidth....1.1 µs External trigger input pulsewidth ...500 ns (min) Stability Recommended warm-up time....5 minutes Physical Dimensions ..........3.0 by 17.2 by 20.3 cm (1.2 by 6.9 by 8.0 in.) SCXI-1127 User Manual © National Instruments Corporation...
  • Page 65 Designed in accordance with IEC-61010-1, UL 3111-1, and CAN/CSA C22.2 No. 1010.1 for electrical measuring and test equipment Approved at altitudes up to 2000 m. Installation Category II Pollution Degree 2 Indoor use only © National Instruments Corporation SCXI-1127 User Manual...
  • Page 66 • Use the 1-slot, 2-slot, and 8-slot HVAB-backplane adapters to connect the HVAB of the SCXI-1127 to the NI-DMM. You can also use them to establish HVAB connections across multiple SCXI-1127 modules or SCXI chassis. 2-slot and 8-slot HVAB-backplane adapters have four connectors on the external side—two HVAB connectors, one digital...

  • Page 67: Customizing Your Module

    Customizing Your Module This appendix describes how to customize your SCXI-1127 module for current-loop receiving. The SCXI-1127 modules have plated through holes for transforming individual channels to current-to-voltage converters. National Instruments offers a process-current pack of four 249 Ω, 0.1%, 5 ppm, 0.25 W resistors.

  • Page 68: Figure C-2. Bent And Trimmed Resistor

    Solder the leads to the pad on the bottom side of the module. Slide the module back into its enclosure. 10. Install the hex bracket screw. 11. Install the rear panel. 12. Install the top cover and grounding screw. SCXI-1127 User Manual © National Instruments Corporation...
  • Page 69 SCXI-1127 Front Connector This appendix contains connector diagrams for the SCXI-1127 switch cards. The diagrams also show the signal names that are used when the modules are in two-wire mode, one-wire mode, four-wire mode, and 8x4 matrix configuration. When you connect a custom terminal block or cable it is important that you incorporate the safety interlock scheme into the terminal block/cable.

  • Page 70: Figure D-1. Scxi-1127 Front Connector Pin Assignments For Two-Wire Mode

    CJS0+ 1_WIRE_LO_REF +5 V (ISO) +5 V (ISO)_HVAB_EN GND (Non-Isolated) +5 V (Non-Isolated) GND (Non-Isolated) GND (Non-Isolated) GND (Non-Isolated) EXT_TRIG_IN SCANADVD GND (Non-Isolated) Figure D-1. SCXI-1127 Front Connector Pin Assignments for Two-Wire Mode SCXI-1127 User Manual © National Instruments Corporation...

  • Page 71: Figure D-2. Scxi-1127 Front Connector Pin Assignments For One-Wire Mode

    +5 V (ISO) +5 V (ISO)_HVAB_EN GND (Non-Isolated) GND (Non-Isolated) +5 V (Non-Isolated) GND (Non-Isolated) GND (Non-Isolated) GND (Non-Isolated) EXT_TRIG_IN SCANADVD GND (Non-Isolated) Figure D-2. SCXI-1127 Front Connector Pin Assignments for One-Wire Mode © National Instruments Corporation SCXI-1127 User Manual...

  • Page 72: Scxi-1127 Front Connector Pin Assignments For Four-Wire Mode

    CJS+ 1_WIRE_LO_REF +5 V (ISO) +5 V (ISO)_HVAB_EN GND (Non-Isolated) +5 V (Non-Isolated) GND (Non-Isolated) GND (Non-Isolated) GND (Non-Isolated) EXT_TRIG_IN SCANADVD GND (Non-Isolated) Figure D-3. SCXI-1127 Front Connector Pin Assignments for Four-Wire Mode SCXI-1127 User Manual © National Instruments Corporation...

  • Page 73: Scxi-1127 Front Connector Pin Assignments To Create An 8X4 Matrix

    +5 V (ISO) +5 V (ISO)_HVAB_EN GND (Non-Isolated) +5 V (Non-Isolated) GND (Non-Isolated) GND (Non-Isolated) GND (Non-Isolated) EXT_TRIG_IN SCANADVD GND (Non-Isolated) Figure D-4. SCXI-1127 Front Connector Pin Assignments to Create an 8x4 Matrix © National Instruments Corporation SCXI-1127 User Manual...

  • Page 74: Table D-1. Front Connector Signal Description

    Chapter D SCXI-1127 Front Connector Table D-1. Front Connector Signal Description Signal Name Type Description +5 V(ISO) Output +5 VDC isolated source—Powers the temperature sensor on the terminal block. Output Ground CJS± Input Cold-junction Temperature Sensor Input— Connects to the temperature sensor of the terminal block.

  • Page 75: Common Questions

    SCXI-1127 connects to the input trigger of the instrument. • If you use the SCXI-1127 to initiate the scan, make sure the DMM is waiting for a trigger before enabling scanning on the SCXI-1127. © National Instruments Corporation...
  • Page 76 NI-SWITCH handles the complex issues of register writes to the module and operating system interfacing. Can I plug a non SCXI-1127 module into a slot that has a high-voltage analog backplane? Yes. You can plug in a module that does not support the HVAB. The non-SCXI-1127 module does not connect to the HVAB or the digital communication lines on the HVAB backplane adapter.
  • Page 77 16x4 matrices. Finally, to create a 16x8 matrix you must connect the 16 columns of each 16x4 matrix through the SCXI-1332 terminal block by using either matrix expansion cables or by wiring the terminal blocks by hand. © National Instruments Corporation SCXI-1127 User Manual...

  • Page 78: Technical Support Resources

    You can submit technical support questions to the applications engineering team through e-mail at . Remember to include support@natinst.com your name, address, and phone number so we can contact you with solutions and suggestions. © National Instruments Corporation SCXI-1127 User Manual...
  • Page 79 08 730 43 70 Switzerland 056 200 51 51 056 200 51 55 Taiwan 02 377 1200 02 737 4644 United Kingdom 01635 523545 01635 523154 United States 512 795 8248 512 794 5678 SCXI-1127 User Manual © National Instruments Corporation...
  • Page 80 Technical Support Form Photocopy this form and update it each time you make changes to your software or hardware, and use the completed copy of this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
  • Page 82 SCXI-1127 Hardware and Software Configuration Form Record the settings and revisions of your hardware and software on the line to the right of each item. Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration.
  • Page 83 The following table is provided for you to list all the modules in your SCXI mainframe SCXI Slot Module Manufacturer, Description, and Function...
  • Page 84 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-1127 User Manual Edition Date: January 1999 Part Number: 322149A-01 Please comment on the completeness, clarity, and organization of the manual.
  • Page 85 Typically, a bus is the expansion vehicle to which I/O or other devices are connected. Examples of PC buses are the ISA and PCI bus. © National Instruments Corporation SCXI-1127 User Manual...
  • Page 86 See digital multimeter. drivers/driver software software that controls a specific hardware device such as a switch card external trigger a voltage pulse from an external source that triggers an event such as A/D conversion SCXI-1127 User Manual © National Instruments Corporation...
  • Page 87 NI-SWITCH an IVI-based instrument driver that supports the National Instruments line of switch cards PCI with extensions for instrumentation © National Instruments Corporation SCXI-1127 User Manual...
  • Page 88 NI-SWITCH that indicates the order in which channels will be scanned scanner advanced trigger the trigger generated by the switch card when scanning. The trigger occurs after the switch card has closed a switch and the switch has settled.
  • Page 89 NI-SWITCH that you can use to interactively control the switch Terminal Block Extension terminal block...
  • Page 90 Glossary watts wire data path between nodes SCXI-1127 User Manual © National Instruments Corporation...
  • Page 91 1-22 schematic for SCXI-1332 connected to connector. See front connector. SCXI-1127 (figure), 2-24 conventions used in manual, v SCXI-1332 connected to SCXI-1127 Convert Thermistor Reading VI, 2-18 (figure), 2-23 custom terminal block, 2-3 SCXI-1332 terminal block (figure), 2-22...
  • Page 92 See installation. environment specifications, A-3 hardware timed scanning, 2-11 to 2-16 external DMMs handshake scanning, 2-15 to 2-16 connecting to SCXI-1127, 1-18 to 1-19 overview, 2-12 hardware timed scanning scanning flowchart (figure), 2-13 handshaking scanning mode, synchronous scanning, 2-14 to 2-15...
  • Page 93 PXI-1010 chassis, 1-15 to 1-16 (figure), 2-27 NI DMM in PXI slot 4, 1-16 16x8 matrix schematic (figure), 2-28 NI DMM in PXI slots 1 through 3, Measurement & Automation utility, 1-20 1-15 to 1-16 mixed mode scanning configuration, connecting SCXI-1127 to NI DMM in...
  • Page 94 SCXI-1127, 1-15 to 1-16 block diagram, 2-3 NI DMM in PXI slot 4, 1-16 wiring diagram, 2-4 NI DMM in PXI slots 1 through 3, 1-15 to 1-16 NI DMM questions about SCXI-1127, E-1 to E-2 connecting SCXI-1127 in multi-chassis...
  • Page 95 A-1 2-3 to 2-4 physical, A-2 block diagram, 2-3 safety, A-3 wiring diagram, 2-4 stability, A-2 transfer characteristics, A-1 trigger characteristics, A-2 stability specifications, A-2 synchronous scanning mode, 2-14 to 2-15 © National Instruments Corporation SCXI-1127 User Manual...

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