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National Instruments SCXI-1120 manual

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Table of contents for the manual

  • Page 1

    © Copyright 1992, 1994 National Instruments Corporation. All Rights Reserved. SCXI-1120 User Manual Eight-Channel Isolated Analog Input Module for Signal Conditioning August 1994 Edition Part Number 320425B-01[...]

  • 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 [...]

  • Page 3

    Limited Warranty The SCXI-1120 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 l[...]

  • Page 4

    © National Instruments Corporation v SCXI-1120 User Manual Contents About This Manual ............................................................................................................. xi Organization of This Manual ......................................................................................... xi Conventions Used in This Manu[...]

  • Page 5

    Contents SCXI-1120 User Manual vi © National Instruments Corporation Digital I/O Signal Connections .............................................................. 2-26 Timing Requirements and Communication Protocol ............................. 2-28 Timing Signal ............................................................................. 2-28 Co[...]

  • Page 6

    Contents © National Instruments Corporation vii SCXI-1120 User Manual Single-Channel Measurements .......................................................................... 5-3 Direct Measurements ............................................................................. 5-3 Parallel Output ......................................................[...]

  • Page 7

    Contents SCXI-1120 User Manual viii © National Instruments Corporation Appendix E SCXI-1120 Cabling ............................................................................................................. E-1 SCXI-1340 Cable Assembly .......................................................................................... E-1 SCXI-1340 Insta[...]

  • Page 8

    Contents © National Instruments Corporation ix SCXI-1120 User Manual Figures Figure 2-1. SCXI-1120 General Parts Locator Diagram ...................................................... 2-2 Figure 2-2. Detailed Parts Locator Diagram ......................................................................... 2-3 Figure 2-3. SCXI-1120 Front Connector Pi[...]

  • Page 9

    Contents SCXI-1120 User Manual x © National Instruments Corporation Tables Table 2-1. Digital Signal Connections, Jumper Settings ..................................................... 2-6 Table 2-2. Jumper W46 Settings ......................................................................................... 2-8 Table 2-3. Jumper W41 Settings .....[...]

  • Page 10

    © National Instruments Corporation xi SCXI-1120 User Manual About This Manual This manual describes the electrical and mechanical aspects of the SCXI-1120 and contains information concerning its operation and programming. The SCXI-1120 is a class I module that operates as eight isolated input channels. Refer to your chassis manual for a descriptio[...]

  • Page 11

    About This Manual SCXI-1120 User Manual xii © National Instruments Corporation • Appendix D, SCXI-1120 Front Connector , describes the pinout and signal names for the SCXI-1120 front connector, including a description of each connection. • Appendix E, SCXI-1120 Cabling, describes how to use and install the hardware accessories for the SCXI-112[...]

  • Page 12

    About This Manual © National Instruments Corporation xiii SCXI-1120 User Manual SCXIbus descriptor may be omitted when the meaning is clear. Descriptions of all SCXIbus signals are given in Appendix C, SCXIbus Connector . Slot 0 Slot 0 refers to the power supply and control circuitry in the SCXI chassis. Abbreviations, acronyms, metric prefixes, m[...]

  • Page 13

    © National Instruments Corporation 1-1 SCXI-1120 User Manual Chapter 1 Introduction This chapter describes the SCXI-1120; lists the contents of your SCXI-1120 kit; describes the optional software, optional equipment, and custom cables; and explains how to unpack the SCXI-1120 kit. The SCXI-1120 is a class I module consisting of eight isolated inpu[...]

  • Page 14

    Introduction Chapter 1 SCXI-1120 User Manual 1-2 © National Instruments Corporation What Your Kit Should Contain The contents of the SCXI-1120 kit (part number 776572-20) are listed as follows. Kit Component Part Number SCXI-1120 module 181695-01 SCXI-1120 User Manual 320425-01 If your kit is missing any of the components, contact National Instrum[...]

  • Page 15

    Chapter 1 Introduction © National Instruments Corporation 1-3 SCXI-1120 User Manual You can also use the SCXI-1120, 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[...]

  • Page 16

    Introduction Chapter 1 SCXI-1120 User Manual 1-4 © National Instruments Corporation Custom Cables The SCXI-1120 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-1120 rear signal[...]

  • Page 17

    © National Instruments Corporation 2-1 SCXI-1120 User Manual Chapter 2 Configuration and Installation This chapter describes the SCXI-1120 jumper configurations, installation of the SCXI-1120 into the SCXI chassis, signal connections to the SCXI-1120, and cable wiring. Module Configuration The SCXI-1120 includes 46 jumpers that are shown in the pa[...]

  • Page 18

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-2 © National Instruments Corporation Figure 2-1. SCXI-1120 General Parts Locator Diagram[...]

  • Page 19

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-3 SCXI-1120 User Manual Figure 2-2 shows a detailed parts locator diagram of the SCXI-1120. Figure 2-2. Detailed Parts Locator Diagram[...]

  • Page 20

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-4 © National Instruments Corporation The jumpers are used as follows: • Fixed jumpers - On Revision A and B modules, jumper W42 is unused and should not be connected. - Jumper W45 is reserved and should not be reconfigured. - On Revision A and B modules, jumper W44 carries the SLOT[...]

  • Page 21

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-5 SCXI-1120 User Manual Jumper W44 On Revision A and B modules, position 1 connects, after buffering, SLOT0SEL* to the SCXIbus INTR* line. This is the factory-default setting and should not be changed. In this setting, the data acquisition board controls the SCXIbus INTR[...]

  • Page 22

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-6 © National Instruments Corporation acquisition board, those different modules will have jumpers similar to W43 and W42 of the SCXI-1120. Set those jumpers on the different modules using the same method described here for the SCXI-1120. On Revision A and B SCXI-1120s, jumper W42 is [...]

  • Page 23

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-7 SCXI-1120 User Manual Table 2-1. Digital Signal Connections, Jumper Settings (Continued) Jumper Description Configuration W45 W44 Factory default Factory default (Revision A and B modules only) • • • 3 2 1 • • • 3 2 1 Analog Configuration The SCXI-1120 has [...]

  • Page 24

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-8 © National Instruments Corporation Table 2-2. Jumper W46 Settings Jumper Description Configuration W46 Factory setting in parking position • • • • • • B A R 2 R 1 R 0 W46 Connects the analog reference to AOGND (pins 1 and 2 of the rear signal connector). Use this connec[...]

  • Page 25

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-9 SCXI-1120 User Manual Table 2-3. Jumper W41 Settings Jumper Description Configuration W41 Temperature sensor accessed in MTS mode (Factory setting) • • • 3 2 1 W41 Temperature sensor accessed in DTS mode, data acquisition board configured for NRSE or RSE • • [...]

  • Page 26

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-10 © National Instruments Corporation Table 2-5. Gain Jumper Positions Gain Setting Jumper Position First-stage 1 10 50 100 D C B A (Factory setting) Second-stage 1 2 5 10 20 A B C D (Factory setting) E Filter Jumpers Two-stage filtering is also available on your SCXI-1120 module. Th[...]

  • Page 27

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-11 SCXI-1120 User Manual Hardware Installation You can install the SCXI-1120 in any available SCXI chassis. After you have made any necessary changes and have verified and recorded the jumper settings on the form in Appendix G, Customer Communication , you are ready to i[...]

  • Page 28

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-12 © National Instruments Corporation Front Connector Figure 2-3 shows the pin assignments for the SCXI-1120 front connector. Pin Number Signal Name Column A B C Signal Name 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 CHSGND +5 V CH3+ CH7+ C[...]

  • Page 29

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-13 SCXI-1120 User Manual Front Connector Signal Descriptions Pin Signal Name Description A2 CHSGND Chassis Ground – Tied to the SCXI chassis. C2 DTEMP Direct Temperature Sensor – Connects the temperature sensor to pin 18 of the rear signal connector MCH7- when the te[...]

  • Page 30

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-14 © National Instruments Corporation I V s V cm High CMV V out + - + - + - + Module Figure 2-4. Ground-Referenced Signal Connection with High Common-Mode Voltage + I V s V out + - + - Module Figure 2-5. Floating Signal Connection Referenced to Chassis Ground for Better Signal -to-No[...]

  • Page 31

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-15 SCXI-1120 User Manual I V s V out + - + - R bias V cm High CMV + - + Module Figure 2-7. AC-Coupled Signal Connection with High Common-Mode Voltage For AC-coupled signals, an external resistor from the positive input channel to the signal reference should be connected.[...]

  • Page 32

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-16 © National Instruments Corporation Connector-and-Shell Assembly Two types of signal connectors are available to connect the signals to the SCXI-1120 inputs. The first, the SCXI-1330 32-pin DIN C female connector-and-shell assembly, is available in a kit listed in the Optional Equi[...]

  • Page 33

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-17 SCXI-1120 User Manual Mounting Screw Lock Washers Nut Jack Screws Grounding Screw Mounting Screw Nut Shell Assembly SCXI-1120 Module Shell Assembly Connector Figure 2-8. Assembling and Mounting the SCXI-1330 Connector-and-Shell Assembly SCXI-1320 and SCXI-1328 Termina[...]

  • Page 34

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-18 © National Instruments Corporation The following warnings contain important safety information concerning hazardous voltages and terminal blocks. Warnings: When using the terminal block with high common-mode voltages, you must insulate your signal wires appropriately. National Ins[...]

  • Page 35

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-19 SCXI-1120 User Manual To determine the temperature, use the following formulas: T ( ° C) = T = T K - 273.15 where T K is the temperature in kelvin T K = 1 a + b lnR T () + c lnR T () 3 [] a = 1.288 x 10 -3 b = 2.356 x 10 -4 c = 9.556 x 10 -8 R T = resistance of the t[...]

  • Page 36

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-20 © National Instruments Corporation Table 2-8. Jumper Settings on the SCXI-1328 Terminal Block Jumper Position Description W1 DTEMP MTEMP • • • • MTS mode selected; factory setting; parking position W1 • • • • DTEMP MTEMP DTS mode selected Terminal Block Signal Conn[...]

  • Page 37

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-21 SCXI-1120 User Manual Figure 2-9. SCXI-1320 Parts Locator Diagram[...]

  • Page 38

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-22 © National Instruments Corporation Figure 2-10. SCXI-1328 Parts Locator Diagram[...]

  • Page 39

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-23 SCXI-1120 User Manual Terminal Block Installation To connect the terminal block to the SCXI-1120 front connector, perform the following steps: 1. Connect the SCXI-1120 front connector to its mating connector on the terminal block. 2. Make sure that the SCXI-1120 top a[...]

  • Page 40

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-24 © National Instruments Corporation 1 2 3 4 5 6 7 8 9 10 1 1 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 AOGND MCH0+ MCH1+ OUTREF SERDA TIN DAQD*/A SLOT0SEL* DIG GND SERCLK RSVD AOGND MCH0- MCH1- DIG GND SERDA[...]

  • Page 41

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-25 SCXI-1120 User Manual Rear Signal Connector Signal Descriptions Pin Signal Name Description 1-2 AOGND Analog Output Ground – Connected to the analog reference when jumper W46 is in position AB-R0. 3-18 MCH0 ± through MCH7 ± Analog Output Channels 0 through 7 – C[...]

  • Page 42

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-26 © National Instruments Corporation The signals on the rear signal connector can be classified as analog output signals, digital I/O signals, or timing I/O signals. Signal connection guidelines for each of these groups are given in the following section. Analog Output Signal Connec[...]

  • Page 43

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-27 SCXI-1120 User Manual The digital output signal is pin 26: • Pin 26 is SERDATOUT and is equivalent to SCXIbus MISO when jumper W43 is in position 1. The digital I/O signals of the SCXI-1120 match the digital I/O lines of the MIO-16 board. When used with an SCXI-1341[...]

  • Page 44

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-28 © National Instruments Corporation Timing Requirements and Communication Protocol Timing Signal The data acquisition timing signal is SCANCLK. SCANCLK is used to increment MUXCOUNTER on its rising edge. Figure 2-12 shows the timing requirements of the SCANCLK signal. These require[...]

  • Page 45

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-29 SCXI-1120 User Manual 01 0 0 11 0 11 Chassis ID = 9 Slot 1 1 SERDA TIN SS*X Chassis Y SS*1 1 Chassis 9 SERCLK SLOT0SEL* T ss_dis T ss_en T clk_wait T slot0sel*_wait T ss _ dis SLOT0SEL* low to SS* disabled 200 nsec maximum T clk _ wait SLOT0SEL* low to first rising ed[...]

  • Page 46

    Configuration and Installation Chapter 2 SCXI-1120 User Manual 2-30 © National Instruments Corporation T low T high SERCLK SERDA TIN SERDA T OUT T setup T hold T delay T low Minimum low time 65 nsec minimum T high Minimum high time 400 nsec minimum T setup SERDATIN setup time 200 nsec minimum T hold SERDATIN hold time 200 nsec minimum T delay SERD[...]

  • Page 47

    Chapter 2 Configuration and Installation © National Instruments Corporation 2-31 SCXI-1120 User Manual SLOT0SEL* SERDATIN SERCLK SS* 0 1 0 00 0 1 10 0001 111 Figure 2-15. Configuration Register Write Timing Diagram To read from the Module ID Register, follow these steps: 1. Initial conditions: SS* asserted low. SERDATIN = don't care. DAQD*/A [...]

  • Page 48

    © National Instruments Corporation 3-1 SCXI-1120 User Manual Chapter 3 Theory of Operation This chapter contains a functional overview of the SCXI-1120 module and explains the operation of each functional unit making up the SCXI-1120. Functional Overview The block diagram in Figure 3-1 illustrates the key functional components of the SCXI-1120. SC[...]

  • Page 49

    Theory of Operation Chapter 3 SCXI-1120 User Manual 3-2 © National Instruments Corporation The major components of the SCXI-1120 are as follows: • SCXIbus connector • Digital interface • Digital control circuitry • Timing and analog circuitry The SCXI-1120 consists of eight isolated amplifier channels with gains of 1, 2, 5, 10, 20, 50, 100[...]

  • Page 50

    Chapter 3 Theory of Operation © National Instruments Corporation 3-3 SCXI-1120 User Manual GUARD GUARD GUARD AB0- GUARD GUARD GUARD GUARD GUARD GUARD CHSGND CHSGND CHSGND CHSGND CHSGND RSVD INTR* D*/A V- V- CHSGND CHSGND V+ V+ +5 V MOSI SCANCON A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8 A9 B9 A10 B10 A1 1 B1 1 A12 B12 A13 B13 A14 B14 A15 B15 [...]

  • Page 51

    Theory of Operation Chapter 3 SCXI-1120 User Manual 3-4 © National Instruments Corporation SCXIbus Connector Signal Descriptions Pin Signal Name Description A1, B1, C1, D1, GUARD Guard – Shields and guards the analog bus lines A2, D2, A3, B3, from noise. C3, D3, A4, D4, A5, B5, C5, D5, A6, D6 B2 AB0+ Analog Bus 0+ – Positive analog bus 0 line.[...]

  • Page 52

    Chapter 3 Theory of Operation © National Instruments Corporation 3-5 SCXI-1120 User Manual Pin Signal Name Description (continued) A24 TRIG0 TRIG0 – General-purpose trigger line used by the SCXI-1120 to send SCANCLK to other modules or receive SCANCLK from other modules. Open collector. I/O. B24 SS* Slot Select – When low, enables module commu[...]

  • Page 53

    Theory of Operation Chapter 3 SCXI-1120 User Manual 3-6 © National Instruments Corporation Digital Interface Figure 3-3 shows a diagram of the SCXI-1120 and SCXIbus digital interface circuitry. Digital Interface SCXIbus Buffered Serial Data Buffered Digital Signal Controls SERDA TIN DAQD*/A SLOT0SEL* SERCLK SERDA TOUT Rear Signal Connector MISO SP[...]

  • Page 54

    Chapter 3 Theory of Operation © National Instruments Corporation 3-7 SCXI-1120 User Manual Digital Control Circuitry Figure 3-4 diagrams the SCXI-1120 digital control. Module ID Register Configuration Register Serial Data Out Input Channel Select Output Stage Control Hardware Scan Control SCANCLK Path Control Buffered Serial Data In Buffered Digit[...]

  • Page 55

    Theory of Operation Chapter 3 SCXI-1120 User Manual 3-8 © National Instruments Corporation The Module ID Register connects to MISO on the SCXIbus. The Module ID Register is an 8-bit, parallel/serial-in, serial-out shift register and an SPI communication adapter. The contents of the Module ID Register are written onto MISO during the first four byt[...]

  • Page 56

    Chapter 3 Theory of Operation © National Instruments Corporation 3-9 SCXI-1120 User Manual + - + - + - + - + - + - + - + - MTEMP DTEMP Input Channel 0 LPF I + LPF + - T o Output Stage Input Channel 1 LPF I + LPF + - T o Output Stage Input Channel 2 LPF I + LPF + - T o Output Stage Input Channel 3 LPF I + LPF + - T o Output Stage Input Channel 4 LP[...]

  • Page 57

    Theory of Operation Chapter 3 SCXI-1120 User Manual 3-10 © National Instruments Corporation The analog input consists of eight 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 [...]

  • Page 58

    Chapter 3 Theory of Operation © National Instruments Corporation 3-11 SCXI-1120 User Manual A multiranging 3 1/2-digit digital multimeter can provide you with the necessary function as described previously. We will refer to the measuring instrument as a digital multimeter (DMM). Each channel on the SCXI-1120 has two potentiometers dedicated for ca[...]

  • Page 59

    Theory of Operation Chapter 3 SCXI-1120 User Manual 3-12 © National Instruments Corporation Table 3-2. Calibration Potentiometers Reference Designators Input Channel Amplifier Channel Number Input Null Output Null 0 R8 R24 1 R10 R25 2 R12 R26 3 R14 R27 4 R16 R28 5 R18 R29 6 R20 R30 7 R21 R31 Analog Output Circuitry Figure 3-6 shows the SCXI-1120 a[...]

  • Page 60

    Chapter 3 Theory of Operation © National Instruments Corporation 3-13 SCXI-1120 User Manual The SCXI-1120 output circuitry consists of a buffered-output multiplexer and channel-select hardware. The channel-select hardware consists of a three-bit counter, MUXCOUNTER. This counter is needed when the board is operating in the Multiplexed-Output mode.[...]

  • Page 61

    Theory of Operation Chapter 3 SCXI-1120 User Manual 3-14 © National Instruments Corporation data acquisition board user manual, or your SCXI chassis user manual. If you need more information, contact National Instruments. Single-Module Parallel Scanning Single-module parallel scanning is the simplest scanning mode. Directly cable the SCXI-1120 to [...]

  • Page 62

    Chapter 3 Theory of Operation © National Instruments Corporation 3-15 SCXI-1120 User Manual except during changes from one Slot 0 scan list entry to the next, when SCANCON pulses high to make the MUXCOUNTER reload its starting channel. Notice that although you are using only a single module, you can put many entries with different counts in the Sl[...]

  • Page 63

    Theory of Operation Chapter 3 SCXI-1120 User Manual 3-16 © National Instruments Corporation onto TRIG0 for the other modules and Slot 0, as shown in Figure 3-10. The scan list in Slot 0 is programmed with the sequence of modules and the number of samples per entry. SCANCLK MCH0 Cable Assembly Data Acquisition Board Analog Input T iming Output SLOT[...]

  • Page 64

    © National Instruments Corporation 4-1 SCXI-1120 User Manual Chapter 4 Register Descriptions This chapter describes in detail the SCXI-1120 Module ID Register, the Configuration Register, the Slot 0 registers, and multiplexer addressing. Note: If you plan to use a programming software package such as NI-DAQ, LabWindows, or LabVIEW with your SCXI-1[...]

  • Page 65

    Register Descriptions Chapter 4 SCXI-1120 User Manual 4-2 © National Instruments Corporation Module ID Register The Module ID Register contains the 4-byte module ID code for the SCXI-1120. 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. With[...]

  • Page 66

    Chapter 4 Register Descriptions © National Instruments Corporation 4-3 SCXI-1120 User Manual Configuration Register The Configuration Register contains 16 bits that control the functions of the SCXI-1120. When SS* is asserted (low) and D*/A indicates data (low), the register will shift in the data present on the MOSI line, bit 15 first, and then l[...]

  • Page 67

    Register Descriptions Chapter 4 SCXI-1120 User Manual 4-4 © National Instruments Corporation Bit Name Description (continued) 5 RTEMP Read Temperature – This bit determines whether the selected channel output or the MTEMP signal is driven onto the MCH0 ± pins of the rear signal connector. If RTEMP is cleared to 0, the selected channel output is[...]

  • Page 68

    Chapter 4 Register Descriptions © National Instruments Corporation 4-5 SCXI-1120 User Manual Slot 0 Register Descriptions Slot 0 has three registers. The Slot-Select Register is a 16-bit, write-only register that determines with which slot the data acquisition board will speak when SLOT0SEL* is released high. In the case of the SCXI-1001 chassis, [...]

  • Page 69

    Register Descriptions Chapter 4 SCXI-1120 User Manual 4-6 © National Instruments Corporation 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 high. An SCXI-1000 chassis will select the appropriate module in its chassis, regardles[...]

  • Page 70

    Chapter 4 Register Descriptions © National Instruments Corporation 4-7 SCXI-1120 User Manual Hardscan Control Register (HSCR) The HSCR contains eight bits that control the setup and operation of the hardscan timing circuitry of Slot 0. To write to the HSCR, follow the procedure given in the Register Writes section in Chapter 5, Programming , using[...]

  • Page 71

    Register Descriptions Chapter 4 SCXI-1120 User Manual 4-8 © National Instruments Corporation FIFO Register The FIFO Register is used to add entries to the Slot 0 FIFO. The FIFO contains the Slot 0 scan list. Each entry contains a slot number to be accessed, and a count number to determine the number of samples to be taken from that slot. To write [...]

  • Page 72

    © National Instruments Corporation 5-1 SCXI-1120 User Manual Chapter 5 Programming This chapter contains a functional programming description of the SCXI-1120 and Slot 0. Note: If you plan to use a programming software package such as NI-DAQ, LabWindows, or LabVIEW with your SCXI-1120 board, you do not need to read this chapter. Programming Consid[...]

  • Page 73

    Programming Chapter 5 SCXI-1120 User Manual 5-2 © National Instruments Corporation Table 5-1. SCXI-1120 Rear Signal Connector Pin Equivalences SCXIbus Line SCXI-1120 Rear Signal Connector MIO-16 Board Lab-NB/Lab-PC/ Lab-PC+/Lab-LC PC-LPM-16 MOSI SERDATIN ADIO0 PB4 DOUT4 D*/A DAQD*/A ADIO1 PB5 DOUT5 INTR* SLOT0SEL* ADIO2 PB6 DOUT6 SPICLK SERCLK EXT[...]

  • Page 74

    Chapter 5 Programming © National Instruments Corporation 5-3 SCXI-1120 User Manual 7. Pull SLOT0SEL* low to deassert the SS* line, latch the data into the Configuration Register and establish conditions for writing a new slot-select number to the Slot 0 Slot-Select Register. 8. If you are not selecting another slot, write zero to the Slot 0 Slot-S[...]

  • Page 75

    Programming Chapter 5 SCXI-1120 User Manual 5-4 © National Instruments Corporation Multiplexed Output To perform a direct multiplexed output measurement, you must cable the SCXI-1120 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 me[...]

  • Page 76

    Chapter 5 Programming © National Instruments Corporation 5-5 SCXI-1120 User Manual To measure one of the eight differential input channels to the SCXI-1120, perform the following steps: 1. Perform any necessary programming to ensure that no modules are driving Analog Bus 0. For an SCXI-1120, clearing AB0EN in the Configuration Register will ensure[...]

  • Page 77

    Programming Chapter 5 SCXI-1120 User Manual 5-6 © National Instruments Corporation 1. Data Acquisition Board Setup Programming The programming steps for your data acquisition board are given in your data acquisition board user manual. You should follow the instructions in the following sections: • AT-MIO-16 User Manual - Multiple A/D Conversions[...]

  • Page 78

    Chapter 5 Programming © National Instruments Corporation 5-7 SCXI-1120 User Manual • MC-MIO-16 User Manual - Multiple A/D Conversions with Continuous Channel Scanning (Round Robin) - Multiple A/D Conversions with Interval Channel Scanning (Pseudosimultaneous) • NB-MIO-16 User Manual - Programming Multiple A/D Conversions with Channel Scanning [...]

  • Page 79

    Programming Chapter 5 SCXI-1120 User Manual 5-8 © National Instruments Corporation Counter 1 and SCANDIV All MIO boards can operate their data acquisition board scan lists in two ways–they can acquire one sample per data acquisition board scan list entry; or they can acquire N samples per data acquisition board scan list entry, where N is a numb[...]

  • Page 80

    Chapter 5 Programming © National Instruments Corporation 5-9 SCXI-1120 User Manual Single-Module Multiplexed Scanning (Direct) To perform simple channel scanning, you must cable the SCXI-1120 to a data acquisition board. See Chapter 2, Configuration and Installation, for more information. To program the module for scanned-channel measurements, wri[...]

  • Page 81

    Programming Chapter 5 SCXI-1120 User Manual 5-10 © National Instruments Corporation also be able to send a SCANCLK*-compatible signal on TRIG0. See Chapter 2, Configuration and Installation, for more information. The module programming steps are as follows: 1. Perform any necessary programming to ensure that no modules are driving Analog Bus 0. Fo[...]

  • Page 82

    Chapter 5 Programming © National Instruments Corporation 5-11 SCXI-1120 User Manual To program the hardscan circuitry, perform the following steps: 1. Write binary 0000 0000 to the HSCR. 2. Write binary 0000 1000 to the HSCR. 3. Write the Slot 0 scan list to the FIFO. 4. Write binary 0010 1100 to the HSCR. 5. Write binary 101S 1100 to the HSCR. 6.[...]

  • Page 83

    Programming Chapter 5 SCXI-1120 User Manual 5-12 © National Instruments Corporation 4. Acquisition Enable, Triggering, and Servicing At this point, you should now continue from where you left off in the 1. Data Acquisition Board Setup Programming section of this chapter. Perform the following steps given in your data acquisition board user manual.[...]

  • Page 84

    Chapter 5 Programming © National Instruments Corporation 5-13 SCXI-1120 User Manual 3. Follow the steps outlined in the section earlier in this chapter, 3. Programming the Slot 0 Hardscan Circuitry, where step 3, Write the Slot 0 scan list to the FIFO , consists of the following: Write 00000000 00000011 to the FIFO Register. This corresponds to Sl[...]

  • Page 85

    Programming Chapter 5 SCXI-1120 User Manual 5-14 © National Instruments Corporation 7. Follow the procedure given in the 4. Acquisition Enable, Triggering, and Servicing section earlier in this chapter. Example 3 You want to scan five channels on an SCXI-1120 in Slot 4 of Chassis 1, then seven channels of an SCXI-1120 in Slot 11 of Chassis 2, thre[...]

  • Page 86

    Chapter 5 Programming © National Instruments Corporation 5-15 SCXI-1120 User Manual 13. Toggle SLOT0SEL*. 14. Write XXXXX001 00000010 over MOSI. 15. Toggle SLOT0SEL*. 16. Write XXXXX011 10000000 over MOSI. 17. Select Slot 0 in Chassis 0.[...]

  • Page 87

    © National Instruments Corporation A-1 SCXI-1120 User Manual Appendix A Specifications This appendix lists the specifications for the SCXI-1120. These are typical at 25 ° C unless otherwise stated. The operating temperature range is 0 ° to 50 ° C. Analog Input Gain (jumper-selectable) 1, 2, 5, 10, 20, 50, 100, 200, 500, 1,000, 2,000 Output rang[...]

  • Page 88

    Specifications Appendix A SCXI-1120 User Manual A-2 © National Instruments Corporation Rise time 4 Hz 0.12 sec 10 kHz 70 µ sec Slew rate 0.15 V/ µ sec Noise (400 kHz bandwidth) 1 Input (gain = 1,000) 4 Hz filter 100 nVrms 10 kHz filter 4 µ Vrms Output (gain = 1) 4 Hz 150 µ Vrms 10 kHz 1 mVrms Operating common-mode voltage 50 or 60 Hz Channel t[...]

  • Page 89

    Appendix A Specifications © National Instruments Corporation A-3 SCXI-1120 User Manual Note: You can find the temperature T ( ° C) as follows: T ( ° C) = T K - 273.15 where T K is the temperature in kelvin T K = 1 a + b lnR T () + c lnR T () 3 [] a = 1.288 x 10 -3 b = 2.356 x 10 -4 c = 9.556 x 10 -8 R T = resistance of the thermistor in Ω R T [...]

  • Page 90

    © National Instruments Corporation B-1 SCXI-1120 User Manual Appendix B Rear Signal Connector This appendix describes the pinout and signal names for the SCXI-1120 50-pin rear signal connector, including a description of each connection. Figure B-1 shows the pin assignments for the SCXI-1120 rear signal connector. 1 2 3 4 5 6 7 8 9 10 1 1 12 13 14[...]

  • Page 91

    Rear Signal Connector Appendix B SCXI-1120 User Manual B-2 © National Instruments Corporation Rear Signal Connector Signal Descriptions Pin Signal Name Description 1-2 AOGND Analog Output Ground – Connected to the analog reference when jumper W46 is in position AB-R0. 3-18 MCH0 ± through MCH7 ± Analog Output Channels 0 through 7 – Connects t[...]

  • Page 92

    Appendix B Rear Signal Connector © National Instruments Corporation B-3 SCXI-1120 User Manual See the Timing Requirements and Communication Protocol section in Chapter 2, Configuration and Installation , for more detailed information on timing. Detailed signal specifications are also included in Chapter 2.[...]

  • Page 93

    © National Instruments Corporation C-1 SCXI-1120 User Manual Appendix C SCXIbus Connector This appendix describes the pinout and signal names for the SCXI-1120 96-pin SCXIbus connector, including a description of each connection. Figure C-1 shows the pinout of the SCXI-1120 SCXIbus connector.[...]

  • Page 94

    SCXIbus Connector Appendix C SCXI-1120 User Manual C-2 © National Instruments Corporation GUARD GUARD GUARD AB0- GUARD GUARD GUARD GUARD GUARD GUARD CHSGND CHSGND CHSGND CHSGND CHSGND RSVD INTR* D*/A V- V- CHSGND CHSGND V+ V+ +5 V MOSI SCANCON A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8 A9 B9 A10 B10 A1 1 B1 1 A12 B12 A13 B13 A14 B14 A15 B15 A[...]

  • Page 95

    Appendix C SCXIbus Connector © National Instruments Corporation C-3 SCXI-1120 User Manual SCXIbus Connector Signal Descriptions Pin Signal Name Description A1, B1, C1, D1, GUARD Guard – Shields and guards the analog bus lines A2, D2, A3, B3, from noise. C3, D3, A4, D4, A5, B5, C5, D5, A6, D6 B2 AB0+ Analog Bus 0+ – Positive analog bus 0 line. [...]

  • Page 96

    SCXIbus Connector Appendix C SCXI-1120 User Manual C-4 © National Instruments Corporation Pin Signal Name Description (continued) A24 TRIG0 TRIG0 – General-purpose trigger line used by the SCXI-1120 to send SCANCLK to other modules or receive SCANCLK from other modules. Open collector. I/O. B24 SS* Slot Select – When low, enables module commun[...]

  • Page 97

    © National Instruments Corporation D- 1 SCXI-1120 User Manual Appendix D SCXI-1120 Front Connector This appendix describes the pinout and signal names for the SCXI-1120 front connector, including a description of each connection. Figure D-1 shows the pin assignments for the SCXI-1120 front connector. Pin Number Signal Name Column A B C Signal Name[...]

  • Page 98

    SCXI-1120 Front Connector Appendix D SCXI-1120 User Manual D- 2 © National Instruments Corporation Front Connector Signal Descriptions Pin Signal Name Description A2 CHSGND Chassis Ground – Tied to the SCXI chassis. C2 DTEMP Direct Temperature Sensor – Connects the temperature sensor to pin 18 of the rear signal connector MCH7- when the termin[...]

  • Page 99

    © National Instruments Corporation E-1 SCXI-1120 User Manual Appendix E SCXI-1120 Cabling This appendix describes how to use and install the hardware accessories for the SCXI-1120: • SCXI-1340 cable assembly • SCXI-1341 Lab-NB, Lab-PC, and Lab-PC+ cable assembly • SCXI-1342 PC-LPM-16 cable assembly • SCXI-1344 Lab-LC cable assembly • SCX[...]

  • Page 100

    SCXI-1120 Cabling Appendix E SCXI-1120 User Manual E-2 © National Instruments Corporation Table E-1 lists the pin equivalences of the MIO-16 board and the SCXI-1120. Table E-1. SCXI-1120 and MIO-16 Board Pinout Equivalences Pin SCXI-1120 Rear Signal Connector MIO-16 Board Equivalent 1-2 AOGND AIGND 3 MCH0+ ACH0 4 MCH0- ACH8 5 MCH1+ ACH1 6 MCH1- AC[...]

  • Page 101

    Appendix E SCXI-1120 Cabling © National Instruments Corporation E-3 SCXI-1120 User Manual 5. Connect the loose end of the cable assembly to the MIO-16 board rear signal connector. Check the installation. After step 1, the order of these steps is not critical; however, it is easier to locate the correct position for the mounting bracket with a modu[...]

  • Page 102

    SCXI-1120 Cabling Appendix E SCXI-1120 User Manual E-4 © National Instruments Corporation Lab boards full access to the digital control lines and analog signals (except DTEMP), but the Lab boards cannot scan channels in Multiplexed mode. Leave jumper W1 in position A on the SCXI-1341 and SCXI-1344. The SCXI-1120 does not use jumper W1. Table E-2 l[...]

  • Page 103

    Appendix E SCXI-1120 Cabling © National Instruments Corporation E-5 SCXI-1120 User Manual 6. For an SCXI-1341, connect the loose end of the ribbon cable to the Lab-NB, Lab-PC, or Lab-PC+ I/O connector. For an SCXI-1344, connect the two 26-pin connectors to the Lab --LC according to the instructions given in the Installation section of Chapter 2, C[...]

  • Page 104

    SCXI-1120 Cabling Appendix E SCXI-1120 User Manual E-6 © National Instruments Corporation Table E-3. SCXI-1342 Pin Translations (Continued) PC-LPM-16 Pin PC-LPM-16 Signal Rear Signal Connector Pin SCXI-1120 Use 36 DOUT6 29 SLOT0SEL* 37 DOUT7 37 SERCLK 46 OUT2 46 No Connect 49 +5 V 34-35 No Connect All other pins of the PC-LPM-16 pinout are not sen[...]

  • Page 105

    Appendix E SCXI-1120 Cabling © National Instruments Corporation E-7 SCXI-1120 User Manual 1. Make sure that the computer and the SCXI chassis are turned off. 2. Remove the front filler panel of the slot where you will insert the SCXI-1180. 3. Thread the rear connector through the front of the chassis to the rear of the chassis. Attach the rear con[...]

  • Page 106

    SCXI-1120 Cabling Appendix E SCXI-1120 User Manual E-8 © National Instruments Corporation Front Panel Connector Front Panel Front Threaded Strip Ribbon Cable to Rear and Breakout Connectors Step 5 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-pi[...]

  • Page 107

    Appendix E SCXI-1120 Cabling © National Instruments Corporation E-9 SCXI-1120 User Manual 50-Pin Connector Grounding Screw Thumbscrew Cutout Step 1 Step 2 Insert Screwdriver in Groove and Rotate to Pry Open Figure E-4. Cover Removal SCXI-1302 Installation Follow these steps to install the SCXI-1302: 1. Install an SCXI-1180 feedthrough panel as des[...]

  • Page 108

    SCXI-1120 Cabling Appendix E SCXI-1120 User Manual E-10 © National Instruments Corporation SCXI-1351 Installation Follow these steps to install the SCXI-1351: 1. Make sure that the computer and the SCXI chassis are turned off. 2. Install the SCXI module in the chassis. 3. Connect the rear connector of the cable extender to the breakout connector i[...]

  • Page 109

    Appendix E SCXI-1120 Cabling © National Instruments Corporation E-11 SCXI-1120 User Manual 5. Connect another ribbon cable or cable assembly to the chassis extender connector. 6. Plug the adapter board front connector to the module rear signal connector. Make sure a corner of the adapter board enters the upper module guide of the chassis. 7. Screw[...]

  • Page 110

    SCXI-1120 Cabling Appendix E SCXI-1120 User Manual E-12 © National Instruments Corporation Table E-4. SCXI-1343 Pin Connections Rear Signal Connector Pin SCXI-1120 Use Connection Type 1 AOGND Solder pad 2 AOGND Screw terminal 3 MCH0+ Screw terminal 4 MCH0- Screw terminal 5 MCH1+ Screw terminal 6 MCH1- Screw terminal 7 MCH2+ Screw terminal 8 MCH2- [...]

  • Page 111

    © National Instruments Corporation F-1 SCXI-1120 User Manual Appendix F Revision A and B Photo and Parts Locator Diagrams This appendix contains a photograph of the Revision A and B SCXI-1120 signal conditioning module and the general and detailed parts locator diagrams. Figure F-1 shows the Revision A and B SCXI-1120 signal conditioning module. F[...]

  • Page 112

    Revision A and B Photo and Parts Locator Diagrams Appendix F SCXI-1120 User Manual F-2 © National Instruments Corporation Figure F-2. Revision A and B SCXI-1120 General Parts Locator Diagram[...]

  • Page 113

    Appendix F Revision A and B Photo and Parts Locator Diagrams © National Instruments Corporation F-3 SCXI-1120 User Manual Figure F-3. Revision A and B SCXI-1120 Detailed Parts Locator Diagram[...]

  • Page 114

    © National Instruments Corporation G- 1 SCXI-1120 User Manual Appendix G Customer Communication For your convenience, this appendix contains forms to help you gather the information necessary to help us solve technical problems you might have as well as a form you can use to comment on the product documentation. Filling out a copy of the Technical[...]

  • Page 115

    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 help[...]

  • Page 116

    SCXI-1120 Hardware 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. Completing this form accurately before contacting[...]

  • Page 117

    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-1120 User Manual Edition Date: August 1994 Part Number: 320425B-01 Please comment on the completeness, clarity, and organization of the manual. [...]

  • Page 118

    © National Instruments Corporation Glossary-1 SCXI-1120 User Manual Glossary Prefix Meaning Value p- pico- 10 -12 n- nano- 10 -9 µ - micro- 10 -6 m- milli- 10 -3 k- kilo- 10 3 M- mega- 10 6 Numbers/Symbols ˚ degrees Ω ohms +5 V (signal) +5 VDC Source signal A A amperes AB0+ Positive Analog Bus 0 signal AB0- Negative Analog Bus 0 signal AB0EN A[...]

  • Page 119

    Glossary SCXI-1120 User Manual Glossary-2 © National Instruments Corporation D D*/A Data/Address signal D/A digital-to-analog DAQD*/A Data Acquisition Board Data/Address Line signal dB decibels DIG GND Digital Ground signal DIN Deutsche Industrie Norme DMM digital multimeter DTEMP Direct Temperature Sensor signal DTS direct temperature sensor F F [...]

  • Page 120

    Glossary © National Instruments Corporation Glossary-3 SCXI-1120 User Manual M m meters M megabytes of memory MCH#+ Positive Analog Output Channel Number signal MCH#- Negative Analog Output Channel Number signal MIO multifunction I/O MISO Master-In-Slave-Out signal MOD Module Number bit MOSI Master-Out-Slave-In signal MSB most significant bit MTEM[...]

  • Page 121

    Glossary SCXI-1120 User Manual Glossary-4 © National Instruments Corporation sec seconds SERCLK Serial Clock signal SERDATIN Serial Data In signal SERDATOUT Serial Data Out signal SL Slot bit SLOT0SEL* Slot 0 Select signal SPI Serial Peripheral Interface SPICLK Serial Peripheral Interface Clock signal SS* Slot Select signal T tempco temperature co[...]

  • Page 122

    SCXI-1120 User Manual Index- 1 © National Instruments Corporation Index Numbers/Symbols +5 V signal front connector, 2-13, D-2 SCXIbus connector, 3-4, C-3 A AB0- signal, 3-4, C-3 AB0+ signal, 3-4, C-3 AB0EN bit, 4-4 AC-coupled signal connection with high common-mode voltage, 2-15 analog configuration direct temperature connection (jumper W41), 2-8[...]

  • Page 123

    Index © National Instruments Corporation Index- 2 SCXI-1120 User Manual SCXI-1120 and MIO-16 board pinout equivalences, E-2 SCXI-1341 cable assembly, E-3 to E-4 installation, E-4 to E-5 SCXI-1342 cable assembly, E-5 to E-6 installation, E-6 SCXI-1343 rear screw terminal adapter installation, E-11 pin connections, E-12 SCXI-1344 cable assembly, E-3[...]

  • Page 124

    Index SCXI-1120 User Manual Index- 3 © National Instruments Corporation register selection and write procedure, 5-2 DIG GND signal, 2-25, B-2 digital control circuitry, 3-7 to 3-8 digital I/O signal connections rear signal connector, 2-26 to 2-27 SCXIbus pin equivalences with SCXI-1120 and data acquisition boards, 2-27 specifications and ratings, [...]

  • Page 125

    Index © National Instruments Corporation Index- 4 SCXI-1120 User Manual SCXI-1328 terminal block, 2-23 SCXI-1340, E-2 to E-3 SCXI-1341, E-4 to E-5 SCXI-1342, E-6 SCXI-1343 rear screw terminal adapter, E-11 SCXI-1344, E-4 to E-5 SCXI-1350 multichassis adapter, E-10 to E-11 SCXI-1351 one-slot cable extender, E-10 unpacking the SCXI-1120, 1-4 INTR* s[...]

  • Page 126

    Index SCXI-1120 User Manual Index- 5 © National Instruments Corporation N NI-DAQ software, 1-2 to 1-3 nulling the offset, 3-11 O ONCE bit, 4-7 operating environment specifications, A-3 operation of SCXI-1120. See theory of operation. OUTREF signal analog output signal connections, 2-26 jumper connection, 2-7 to 2-8 rear signal connector, 2-25, B-2[...]

  • Page 127

    Index © National Instruments Corporation Index- 6 SCXI-1120 User Manual reference-mode selection (jumper W46), 2-7 registers programming considerations, 5-1 to 5-3 initialization, 5-3 rear signal connector pin equivalences, 5-2 register selection and write procedure, 5-2 to 5-3 SCXI-1120 registers, 4-1 to 4-4 Configuration Register, 2-30 to 2-31, [...]

  • Page 128

    Index SCXI-1120 User Manual Index- 7 © National Instruments Corporation Configuration Register, 2-30 to 2-31, 3-7, 4-3 to 4-4 Module ID Register, 2-31, 3-8, 4-2 SCXI-1180 feedthrough panel cable assembly, E-6 front panel installation, E-8 installation, E-6 to E-8 rear connections, E-7 SCXI-1302 50-pin terminal block installation, E-9 wiring proced[...]

  • Page 129

    Index © National Instruments Corporation Index- 8 SCXI-1120 User Manual temperature sensor connection, 2-15 rear signal connector analog output signal connections, 2-26 communication signals, 2-28 to 2-31 digital I/O signal connections, 2-26 to 2-27 pin assignments, 2-24, B-1 pin equivalences with SCXIbus and data acquisition boards, 2-27, 5-2 SCX[...]

  • Page 130

    Index SCXI-1120 User Manual Index- 9 © National Instruments Corporation analog and timing circuitry, 3-8 to 3-13 analog input block diagram, 3-9 analog input channels, 3-9 to 3-10 analog output circuitry, 3-12 to 3-13 calibration, 3-10 to 3-12 block diagram, 3-1 digital control circuitry, 3-7 to 3-8 digital interface circuitry, 3-6 scanning modes,[...]