SCXI-1120 User Manual Eight-Channel Isolated Analog Input Module for Signal Conditioning August 1994 Edition Part Number 320425B-01 © Copyright 1992, 1994 National Instruments Corporation. All Rights Reserved.
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.
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 labor.
Contents About This Manual .............................................................................................................xi Organization of This Manual .........................................................................................xi Conventions Used in This Manual .................................................................................xii Related Documentation ..................................................................................................
Contents Digital I/O Signal Connections ..............................................................2-26 Timing Requirements and Communication Protocol.............................2-28 Timing Signal.............................................................................2-28 Communication Signals .........................................................................2-28 Chapter 3 Theory of Operation ..................................................................................................
Contents Single-Channel Measurements ..........................................................................5-3 Direct Measurements .............................................................................5-3 Parallel Output ...........................................................................5-3 Multiplexed Output ....................................................................5-4 Indirect Measurements ...........................................................................
Contents Appendix E SCXI-1120 Cabling .............................................................................................................E-1 SCXI-1340 Cable Assembly ..........................................................................................E-1 SCXI-1340 Installation ......................................................................................E-2 SCXI-1341 Lab-NB, Lab-PC, or Lab-PC+ and SCXI-1344 Lab-LC Cable Assembly........................................................
Contents Figures Figure Figure Figure Figure Figure 2-1. 2-2. 2-3. 2-4. 2-5. Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure 2-6. 2-7. 2-8. 2-9. 2-10. 2-11. 2-12. 2-13. 2-14. 2-15. 2-16. SCXI-1120 General Parts Locator Diagram ......................................................2-2 Detailed Parts Locator Diagram.........................................................................2-3 SCXI-1120 Front Connector Pin Assignment .............................................
Contents Tables Table Table Table Table Table Table Table Table Table 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 2-8. 2-9. Digital Signal Connections, Jumper Settings.....................................................2-6 Jumper W46 Settings .........................................................................................2-8 Jumper W41 Settings .........................................................................................2-9 Gain Jumper Allocation .............................................
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 description of the different module classes. Each channel is isolated and independently configurable via jumpers. Refer to your chassis manual for a description of the different module classes.
About This Manual • 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-1120. • Appendix F, Revision A and B Photo and Parts Locator Diagrams, contains a photograph of the Revision A and B SCXI-1120 signal conditioning module and the general and detailed parts locator diagrams.
About This 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, mnemonics, symbols, and terms are listed in the Glossary.
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 input channels. The SCXI-1120 is a module for signal conditioning of thermocouples, volt sources, millivolt sources, 4 to 20 mA current sources, and 0 to 20 mA process-current sources.
Introduction Chapter 1 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 SCXI-1120 User Manual 181695-01 320425-01 If your kit is missing any of the components, contact National Instruments. Optional Software This manual contains complete instructions for directly programming the SCXI-1120. You can order separate software packages for controlling the SCXI-1120 from National Instruments.
Chapter 1 Introduction 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 for MPW C, THINK C, Pascal, and Microsoft QuickBASIC. Any language that uses Device Manager Toolbox calls can access NI-DAQ software for Macintosh.
Introduction Chapter 1 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 connector is a 50-position polarized ribbon-socket connector with strain relief. National Instruments uses a polarized or keyed connector to prevent inadvertent upside-down connection to the SCXI-1120.
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 parts locator diagrams in Figures 2-1 and 2-2.
Configuration and Installation Chapter 2 Figure 2-1.
Chapter 2 Configuration and Installation Figure 2-2 shows a detailed parts locator diagram of the SCXI-1120. Figure 2-2.
Configuration and Installation Chapter 2 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 SLOT0SEL* signal from the rear signal connector, after buffering, to the SCXIbus INTR* line and should be left in the factory-default position (position 1). On Revision C and later modules, jumper W44 does not exist.
Chapter 2 Configuration and Installation 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* line. See the Timing Requirements and Communication Protocol section later in this chapter, and Chapter 5, Programming, for information on the use of the INTR* line.
Configuration and Installation Chapter 2 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 not used. You set jumper W43 as explained in the cases above, except in the case of a multichassis ribbon cable system.
Chapter 2 Configuration and Installation Table 2-1. Digital Signal Connections, Jumper Settings (Continued) Jumper W45 W44 Description Factory default Factory default (Revision A and B modules only) Configuration 3 • 2 • 1 • 3 • 2 • 1 • Analog Configuration The SCXI-1120 has 42 analog configuration jumpers. Before starting, notice that the jumper configurations for each channel are similar; only the jumper reference designator number changes.
Configuration and Installation Chapter 2 Table 2-2. Jumper W46 Settings Jumper W46 Description Factory setting in parking position Configuration • • • B • • • A R2 R1 R0 W46 W46 Connects the analog reference to AOGND (pins 1 and 2 of the rear signal connector). Use this connection with RSE data acquisition boards.
Chapter 2 Configuration and Installation Table 2-3. Jumper W41 Settings Description W41 Temperature sensor accessed in MTS mode (Factory setting) Temperature sensor accessed in DTS mode, data acquisition board configured for NRSE or RSE 3 2 1 • • • W41 Configuration • • • Jumper 3 2 1 Gain Jumpers Each input channel has two gain stages. The first gain stage provides gains of 1, 10, 50, and 100, and the second stage provides gains of 1, 2, 5, 10, and 20.
Configuration and Installation Chapter 2 Table 2-5. Gain Jumper Positions Gain Setting First-stage 1 10 50 100 D C B A (Factory setting) 1 2 5 10 20 A B C D (Factory setting) E Second-stage Jumper Position Filter Jumpers Two-stage filtering is also available on your SCXI-1120 module. The first stage is located in the isolated section of the input channel, whereas the second stage is located in the nonisolated section of your input channel.
Chapter 2 Configuration and Installation 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 install the SCXI-1120. The following are general installation instructions, but consult the user manual or technical reference manual of your SCXI chassis for specific instructions and warnings. 1.
Configuration and Installation Chapter 2 Front Connector Figure 2-3 shows the pin assignments for the SCXI-1120 front connector. Pin Number 32 Signal Name A Column B C Signal Name CH0+ CH0- CH1+ CH1- CH2+ CH2- CH3+ CH3- CH4+ CH4- CH5+ CH5- CH6+ CH6- CH7+ CH7- 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 RSVD 8 7 6 RSVD RSVD +5 V MTEMP CHSGND DTEMP 5 4 3 2 1 Figure 2-3.
Chapter 2 Configuration and Installation 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 terminal block is configured for direct temperature connection and jumper W41 is in position 3. A4 +5 V +5 VDC Source – Used to power the temperature sensor on the terminal block. 0.2 mA of source not protected.
Configuration and Installation Chapter 2 + + Vs - + Vout - Vcm + High - CMV I Module Figure 2-4. Ground-Referenced Signal Connection with High Common-Mode Voltage Vs + - + + Vout - I Module Figure 2-5. Floating Signal Connection Referenced to Chassis Ground for Better Signal-to-Noise Ratio + + + Vs Rbias - - Vout I Module Figure 2-6.
Chapter 2 Configuration and Installation Rbias - Vout I Vcm + High - + + + Vs - 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. This is needed to provide the DC path for the positive input bias current. Typical resistor values range from 100 kΩ to 1 MΩ.
Configuration and Installation Chapter 2 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 Equipment section in Chapter 1, Introduction. The connector has eyelet ends for easy hook-and-solder wire connection. With this kit, you can build your own signal cable to connect to the SCXI-1120 inputs.
Chapter 2 Configuration and Installation Shell Assembly Mounting Screw Connector Jack Screws SCXI-1120 Module Lock Washers Nut Nut Shell Assembly Grounding Screw Mounting Screw Figure 2-8. Assembling and Mounting the SCXI-1330 Connector-and-Shell Assembly SCXI-1320 and SCXI-1328 Terminal Blocks The second type of connector available to connect the signals to the SCXI-1120 inputs is a terminal block with an onboard temperature sensor and screw terminals for easy connection.
Configuration and Installation Chapter 2 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 Instruments is not liable for any damages or injuries resulting from inadequate signal wire insulation. If high voltages (≥42 Vrms) are present, you must connect the safety earth ground to the strain-relief tab.
Chapter 2 Configuration and Installation To determine the temperature, use the following formulas: T (°C) = T = TK - 273.15 where TK is the temperature in kelvin TK = 1 [a + b(lnR ) + c(lnR ) ] 3 T T a = 1.288 x 10-3 b = 2.356 x 10-4 c = 9.556 x 10-8 RT = resistance of the thermistor in Ω V TEMPOUT R T = 50,000 2.
Configuration and Installation Chapter 2 Table 2-8. Jumper Settings on the SCXI-1328 Terminal Block Jumper Position W1 • • DTEMP W1 MTEMP • • • • DTEMP Description MTS mode selected; factory setting; parking position DTS mode selected MTEMP • • Terminal Block Signal Connection Warnings: The chassis GND terminals on your terminal block are for grounding high impedance sources such as a floating source (1 mA maximum). Do not use these terminals as safety earth grounds.
Chapter 2 Configuration and Installation Figure 2-9.
Configuration and Installation Chapter 2 Figure 2-10.
Chapter 2 Configuration and Installation 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 and bottom thumbscrews do not obstruct the rear panel of the terminal block. 3. Tighten the top and bottom screws on the back of the terminal block to hold it securely in place.
Configuration and Installation Chapter 2 AOGND 1 2 AOGND MCH0+ 3 4 MCH0- MCH1+ 5 6 MCH1- MCH2+ 7 8 MCH2- MCH3+ 9 10 MCH3- MCH4+ 11 12 MCH4- MCH5+ 13 14 MCH5- MCH6+ 15 16 MCH6- MCH7+ 17 18 MCH7- OUTREF 19 20 21 22 23 24 DIG GND SERDATIN 25 26 SERDATOUT DAQD*/A 27 28 SLOT0SEL* 29 30 31 32 DIG GND 33 34 35 36 SERCLK SCANCLK 37 38 39 40 41 42 RSVD 43 44 45 46 47 48 49 50 Figure 2-11.
Chapter 2 Configuration and Installation 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 to the data acquisition board differential analog input channels.
Configuration and Installation Chapter 2 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 Connections Pins 1 through 19 of the rear signal connector are analog output signal pins. Pins 1 and 2 are AOGND signal pins.
Chapter 2 Configuration and Installation 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, SCXI-1342, or SCXI-1344 cable assembly, the SCXI-1120 signals match the digital lines of the Lab-NB/Lab-PC+/Lab-LC boards and the PC-LPM-16 board, respectively. Table 2-9 lists the equivalences.
Configuration and Installation Chapter 2 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 requirements will ensure that SCANCLK is properly transmitted over TRIG0. Thigh Tlow SCANCLK Tlow Thigh Time low before rising edge Time high before falling edge 400 nsec minimum 250 nsec minimum Figure 2-12.
Chapter 2 Configuration and Installation SLOT0SEL* SS*X Chassis Y SS*11 Chassis 9 Tss_dis Tclk_wait Tss_en SERCLK Tslot0sel*_wait SERDATIN 0 1 0 0 1 1 0 Chassis ID = 9 Tss _ dis Tclk _ wait Tslot0sel* _ wait Tss _ en SLOT0SEL* low to SS* disabled SLOT0SEL* low to first rising edge on SERCLK Last rising edge on SERCLK to SLOT0SEL* high SLOT0SEL* high to SS* enabled 1 1 Slot 11 200 nsec maximum 75 nsec minimum 250 nsec minimum 350 nsec maximum Figure 2-13.
Configuration and Installation Chapter 2 Thigh Tlow SERCLK Tsetup Thold SERDATIN Tdelay SERDATOUT Tlow Thigh Tsetup Thold Tdelay Minimum low time Minimum high time SERDATIN setup time SERDATIN hold time SERDATOUT delay 65 nsec minimum 400 nsec minimum 200 nsec minimum 200 nsec minimum 350 nsec maximum Figure 2-14.
Chapter 2 Configuration and Installation SLOT0SEL* SS* SERCLK 1 0 0 0 0 0 1 1 0 0 0 0 1 1 1 1 SERDATIN 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 = 1. Make sure DAQD*/A does not go low or erroneous data will be written to the Configuration Register. SLOT0SEL* = 1. SERCLK = 1 (and has not changed since SS* went low). 2. For each bit to be read: SERCLK = 0.
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.
Theory of Operation Chapter 3 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, 200, 500, 1,000, and 2,000. The SCXI-1120 also has a digital section for automatic control of channel scanning, temperature selection, and MUXCOUNTER clock selection.
Chapter 3 Theory of Operation GUARD GUARD GUARD AB0+ GUARD GUARD GUARD GUARD GUARD GUARD RESET* MISO VVCHSGND CHSGND V+ V+ +5 V SPICLK TRIG0 SS* A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8 A9 B9 A10 B10 A11 B11 A12 B12 A13 B13 A14 B14 A15 B15 A16 B16 A17 B17 A18 B18 A19 B19 A20 B20 A21 B21 A22 B22 A23 B23 A24 B24 D1 C1 D2 C2 D3 C3 D4 C4 D5 C5 D6 C6 D7 C7 D8 C8 D9 C9 D10 C10 D11 C11 D12 C12 D13 C13 D14 C14 D15 C15 D16 C16 D17 C17 D18 C18 D19 C19 D20 C20 D21 C21 D22 C22 D23 C23 D24 C24 GUARD GUARD G
Theory of Operation Chapter 3 SCXIbus Connector Signal Descriptions Pin Signal Name Description A1, B1, C1, D1, GUARD A2, D2, A3, B3, C3, D3, A4, D4, A5, B5, C5, D5, A6, D6 Guard – Shields and guards the analog bus lines from noise. B2 AB0+ Analog Bus 0+ – Positive analog bus 0 line. Used to multiplex several modules to one analog signal. C2 AB0- Analog Bus 0- – Negative analog bus 0 line. Used to multiplex several modules to one analog signal.
Chapter 3 Theory of Operation 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 communications over the SCXIbus. Totem pole. Input. C24 SCANCON Scanning Control – Combination output enable and reload signal for scanning operations. Totem pole. Input. All other pins are not connected.
Theory of Operation Chapter 3 Digital Interface Figure 3-3 shows a diagram of the SCXI-1120 and SCXIbus digital interface circuitry. SERDATIN Buffered Serial Data DAQD*/A Digital Interface Buffered Digital Signal Controls SLOT0SEL* SERCLK Rear Signal Connector SS* MOSI D*/A INTR* SPICLK MISO SCXIbus SERDATOUT Figure 3-3. Digital Interface Circuitry Block Diagram The digital interface circuitry is divided into a data acquisition section and an SCXIbus section.
Chapter 3 Theory of Operation Digital Control Circuitry Figure 3-4 diagrams the SCXI-1120 digital control. Serial Data Out Module ID Register Buffered Serial Data In Input Channel Select Configuration Register Output Stage Control Buffered Digital Control Signals SCANCLK Path Control Hardware Scan Control Figure 3-4. SCXI-1120 Digital Control The digital control section consists of the Configuration Register and the Module ID Register.
Theory of Operation Chapter 3 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 bytes of transfer after SS* has been asserted low. Zeros are written to MISO thereafter until SS* is released and reasserted. The SCXI-1120 module ID is hex 00000004.
Chapter 3 Theory of Operation Input Channel 0 + + LPF LPF - + - To Output Stage I Input Channel 1 + + LPF LPF - + - To Output Stage I Input Channel 2 + + LPF LPF - + - To Output Stage I Input Channel 3 + + LPF Front Connector LPF - + - To Output Stage I Input Channel 4 + + LPF LPF - + - To Output Stage I Input Channel 5 + + LPF LPF - + - To Output Stage I Input Channel 6 + + LPF LPF - + - To Output Stage I Input Channel 7 + + LPF LPF - + - To Output S
Theory of Operation Chapter 3 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 stage providing gains of 1, 10, 50, and 100, and a second stage providing gains of 1, 2, 5, 10, and 20. Each channel is configurable to a different bandwidth and gain.
Chapter 3 Theory of Operation 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 calibration. One potentiometer is used to null the output offset; the other is used to null the input offset. Offset Null Adjust To null the offset of the amplifier channels, complete the following steps: 1.
Theory of Operation Chapter 3 Table 3-2. Calibration Potentiometers Reference Designators Input Channel Number Amplifier Channel Input Null Output Null 0 1 2 3 4 5 6 7 R8 R10 R12 R14 R16 R18 R20 R21 R24 R25 R26 R27 R28 R29 R30 R31 Analog Output Circuitry Figure 3-6 shows the SCXI-1120 analog output circuitry.
Chapter 3 Theory of Operation 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. The counter output is sent to the output multiplexer address pins to determine which of the eight channels is to be connected to MCH0.
Theory of Operation Chapter 3 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 the data acquisition board as shown in Figure 3-7. In this configuration, each analog signal has its own channel.
Chapter 3 Theory of Operation 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 Slot 0 FIFO, so that some channels are read more often than others. You cannot change the start channel in the module Configuration Register during a scan.
Theory of Operation Chapter 3 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. SCXI-1000 or SCXI-1001 Chassis SCANCON X Data Acquisition Board SCANCON B SCANCON A Analog Input Timing Output TRIG0 SCANCLK MCH0 SLOT 0 SCXI Module SCXI Module SLOT B SLOT A Cable Assembly SCXI Module SLOT X Analog Bus 0 Figure 3-10.
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-1120 board, you do not need to read this chapter. Register Description Register Description Format This register description chapter discusses each of the SCXI-1120 registers and the Slot 0 registers.
Register Descriptions Chapter 4 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. Within each byte, data is sent out MSB first. Additional data transfers will result in all zeros being sent on the MISO line.
Chapter 4 Register Descriptions 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 latch it when the SCXI-1120 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.
Register Descriptions Chapter 4 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 used as the module output. If RTEMP is set to 1, the MTEMP signal is used as the module output. The module output will only be driven when FOUTEN* is cleared to 0, or SCANCON is active (low) while SCANCONEN* is cleared.
Chapter 4 Register Descriptions 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, the Slot-Select Register also determines in which chassis the desired slot is. The FIFO Register is a 16-bit, write-only register used for storing the Slot 0 scan list that determines the chassis scan sequence.
Register Descriptions Chapter 4 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, regardless of the chassis number written. The Slot-Select Register will shift in the data present on the MOSI line, bit 16 first, when SLOT0SEL* is low.
Chapter 4 Register Descriptions 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 13 as the slot number and writing eight bits to the HSCR. The register will shift in the data present on the MOSI line, bit 7 first, when Slot 13 is selected by the Slot-Select Register.
Register Descriptions Chapter 4 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 to the FIFO Register, follow the procedure given in the Register Writes section in Chapter 5, Programming, using 14 as the slot number, and writing 16 bits to the FIFO Register.
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 Considerations Programming the SCXI-1120 involves writing to the Configuration Register. Programming Slot 0 involves writing to the HSCR and FIFO Register.
Programming Chapter 5 Table 5-1. SCXI-1120 Rear Signal Connector Pin Equivalences SCXIbus Line SCXI-1120 Rear Signal Connector MOSI D*/A INTR* SPICLK MISO SERDATIN DAQD*/A SLOT0SEL* SERCLK SERDATOUT MIO-16 Board Lab-NB/Lab-PC/ Lab-PC+/Lab-LC PC-LPM-16 PB4 PB5 PB6 PB7 PC1 DOUT4 DOUT5 DOUT6 DOUT7 DIN6 ADIO0 ADIO1 ADIO2 EXTSTROBE* BDIO0 Register Selection and Write Procedure 1. Select the slot of the module to be written to (or Slot 13 or 14). Initial conditions: SERDATIN = X. DAQD*/A = X.
Chapter 5 Programming 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-Select Register. If you are selecting another slot, start at step 3.
Programming Chapter 5 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 measurement with your data acquisition board, consult your data acquisition board user manual.
Chapter 5 Programming 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 that its output is not driving AB0. 2. Program the other module not to drive Analog Bus 0, but to send Analog Bus 0 to the data acquisition board. 3.
Programming Chapter 5 1. Data Acquisition Board Setup Programming The programming steps for your data acquisition board are given in your data acquisition board user manual.
Chapter 5 • • 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 Programming Multiple A/D Conversions with Channel Scanning NB-MIO-16X User Manual - Multiple A/D Conversions with Continuous Channel Scanning (Round Robin) - Multiple A/D Conversions with Interval Channel Scanning (Pseudosimultaneous) PC-LPM-16 User Manual - Program
Programming Chapter 5 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 number from 2 to 65,535 that is programmed in Counter 1.
Chapter 5 Programming 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, write the binary pattern 10XXXCCC XX001101 to the SCXI-1120 Configuration Register. CCC represents the starting channel number.
Programming Chapter 5 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. For an SCXI-1120, clearing AB0EN in the Configuration Register will ensure that its output is not driving AB0. 2.
Chapter 5 Programming 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. Write binary 101S 1110 to the HSCR. 7. Write binary 101S 1111 to the HSCR. To program the hardscan circuitry to use the current scan list, perform the following steps: 1. Write binary 0000 1000 to the HSCR. 2.
Programming Chapter 5 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. • • MIO board user manual - Enable the scanning data acquisition operation. - Apply a trigger. - Service the data acquisition operation.
Chapter 5 Programming 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 Slot 1 for four samples. 4. Follow the procedure given in the 4. Acquisition Enable, Triggering, and Servicing section earlier in this chapter.
Programming Chapter 5 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, three channels of an SCXI-1120 in Slot 3 in Chassis 3, and one channel of an SCXI-1120 in Slot 8 of Chassis 3.
Chapter 5 13. Programming Toggle SLOT0SEL*. 14. Write XXXXX001 00000010 over MOSI. 15. Toggle SLOT0SEL*. 16. Write XXXXX011 10000000 over MOSI. 17. Select Slot 0 in Chassis 0.
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 range ±5 V Number of channels 8 Gain accuracy 0.15% of full scale Offset voltage Input Output ±6 µV ±3 mV Stability versus ambient temperature Input offset drift ±0.
Specifications Appendix A Rise time 4 Hz 10 kHz 0.12 sec 70 µsec Slew rate 0.
Appendix A Note: Specifications You can find the temperature T (°C) as follows: T (°C) = TK - 273.15 where TK is the temperature in kelvin TK = 1 [a + b(lnR ) + c(lnR ) ] 3 T T a = 1.288 x 10-3 b = 2.356 x 10-4 c = 9.556 x 10-8 RT = resistance of the thermistor in Ω V TEMPOUT R T = 50,000 2.5− V TEMPOUT VTEMPOUT = output voltage of the temperature sensor Physical Dimensions 1.2 by 6.8 by 8.0 in.
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.
Rear Signal Connector Appendix B 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 to the data acquisition board differential analog inputchannels.
Appendix B Rear Signal Connector 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.
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.
SCXIbus Connector Appendix C GUARD GUARD GUARD AB0+ GUARD GUARD GUARD GUARD GUARD GUARD RESET* MISO VVCHSGND CHSGND V+ V+ +5 V SPICLK TRIG0 SS* A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8 A9 B9 A10 B10 A11 B11 A12 B12 A13 B13 A14 B14 A15 B15 A16 B16 A17 B17 A18 B18 A19 B19 A20 B20 A21 B21 A22 B22 A23 B23 A24 B24 D1 C1 D2 C2 D3 C3 D4 C4 D5 C5 D6 C6 D7 C7 D8 C8 D9 C9 D10 C10 D11 C11 D12 C12 D13 C13 D14 C14 D15 C15 D16 C16 D17 C17 D18 C18 D19 C19 D20 C20 D21 C21 D22 C22 D23 C23 D24 C24 GUARD GUARD GU
Appendix C SCXIbus Connector SCXIbus Connector Signal Descriptions Pin Signal Name Description A1, B1, C1, D1, GUARD A2, D2, A3, B3, C3, D3, A4, D4, A5, B5, C5, D5, A6, D6 Guard – Shields and guards the analog bus lines from noise. B2 AB0+ Analog Bus 0+ – Positive analog bus 0 line. Used to multiplex several modules to one analog signal. C2 AB0- Analog Bus 0- – Negative analog bus 0 line. Used to multiplex several modules to one analog signal.
SCXIbus Connector Appendix C 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 communications over the SCXIbus. Totem pole. Input. C24 SCANCON Scanning Control – Combination output enable and reload signal for scanning operations. Totem pole. Input. All other pins are not connected.
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.
SCXI-1120 Front Connector Appendix D 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 terminal block is configured for direct temperature connection and jumper W41 is in position 3. A4 +5 V +5 VDC Source – Used to power the temperature sensor on the terminal block. 0.2 mA of source not protected.
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 • SCXI-1180 feedthrough panel • SCXI-1302 50-pin terminal block • SCXI-1351 one-slot cable extender • SCXI-1350 multichassis adapter • SCXI-1343 screw terminal adapter SCXI-1340 Cable Assembly The SCXI-1340 cable assembly
SCXI-1120 Cabling Appendix E Table E-1 lists the pin equivalences of the MIO-16 board and the SCXI-1120. Table E-1.
Appendix E SCXI-1120 Cabling 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 module installed in the chassis. If you will attach a cable to the breakout connector, installation is easiest if you attach the second cable before installing the SCXI-1340.
SCXI-1120 Cabling Appendix E 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 lists the SCXI-1341 and SCXI-1344 pin translations. Note: If you are using the Lab-PC+, configure the board for single-ended inputs. Table E-2.
Appendix E SCXI-1120 Cabling 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, Configuration and Installation, of the Lab-LC User Manual. Check the installation. SCXI-1342 PC-LPM-16 Cable Assembly The SCXI-1342 PC-LPM-16 cable assembly connects a PC-LPM-16 board to an SCXI-1120 module.
SCXI-1120 Cabling Appendix E Table E-3. SCXI-1342 Pin Translations (Continued) PC-LPM-16 Pin PC-LPM-16 Signal 36 37 46 49 Rear Signal Connector Pin 29 37 46 34-35 DOUT6 DOUT7 OUT2 +5 V SCXI-1120 Use SLOT0SEL* SERCLK No Connect No Connect All other pins of the PC-LPM-16 pinout are not sent to the SCXI-1120 rear signal connector. SCXI-1342 Installation Follow these steps to install the SCXI-1342: 1. Make sure that the computer and the SCXI chassis are turned off. 2.
Appendix E SCXI-1120 Cabling 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 connector to the breakout connector of the adjacent cable assembly or slot extender, as shown in Figure E-2.
SCXI-1120 Cabling Appendix E Front Panel Connector Ribbon Cable to Rear and Breakout Connectors Step 5 Front Panel Front Threaded Strip Figure E-3. SCXI-1180 Front Panel Installation SCXI-1302 50-Pin Terminal Block The SCXI-1302 terminal block has screw terminal connections for the 50-pin connector on the SCXI-1180 feedthrough panel. SCXI-1302 Wiring Procedure To wire the SCXI-1302 terminal block, you must remove the cover, connect all the wiring, and replace the cover.
Appendix E SCXI-1120 Cabling 50-Pin Connector Grounding Screw Step 2 Step 1 Insert Screwdriver in Groove and Rotate to Pry Open Thumbscrew Cutout Figure E-4. Cover Removal SCXI-1302 Installation Follow these steps to install the SCXI-1302: 1. Install an SCXI-1180 feedthrough panel as described in the SCXI-1180 Installation section. 2. Wire the terminal block as previously described in the SCXI-1302 Wiring Procedure section. 3.
SCXI-1120 Cabling Appendix E 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 in the adjacent slot. This attachment is similar to Step 3 in the SCXI-1180 Installation section, as shown in Figure E-2. 4. Plug the mounting bracket connector to the module rear signal connector.
Appendix E SCXI-1120 Cabling 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 the rear panel to the threaded strips in the rear of the chassis. 8.
SCXI-1120 Cabling Appendix E Table E-4.
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. Figures F-2 and F-3 show the general and detailed parts locator diagrams. Figure F-1.
Revision A and B Photo and Parts Locator Diagrams Appendix F Figure F-2.
Appendix F Revision A and B Photo and Parts Locator Diagrams Figure F-3.
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 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.
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.
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 National Instruments for technical support helps our applications engineers answer your questions more efficiently.
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. If you find errors in the manual, please record the page numbers and describe the errors. Thank you for your help.
Glossary Prefix pnµmkM- Meaning Value piconanomicromillikilomega- 10-12 10-9 10-6 10-3 103 106 Numbers/Symbols ˚ Ω +5 V (signal) degrees ohms +5 VDC Source signal A A AB0+ AB0AB0EN ACH# A/D AOGND Arms AWG amperes Positive Analog Bus 0 signal Negative Analog Bus 0 signal Analog Bus 0 Enable bit data acquisition board Analog Input Channel Number analog-to-digital Analog Output Ground signal amperes, root mean square American Wire Gauge B BW bandwidth C C CH#+ CH#CHAN CHS CHSGND CJR CLKEN CLKOUTEN C
Glossary D D*/A D/A DAQD*/A dB DIG GND DIN DMM DTEMP DTS Data/Address signal digital-to-analog Data Acquisition Board Data/Address Line signal decibels Digital Ground signal Deutsche Industrie Norme digital multimeter Direct Temperature Sensor signal direct temperature sensor F F FIFO FOUTEN* FRT Fahrenheit first-in-first-out Forced Output Enable bit Forced Retransmit bit G GBWP GUARD gain bandwidth product Guard signal H hex HSCR HSRS* Hz hexadecimal Hardscan Control Register Hardscan Reset bit her
Glossary M m M MCH#+ MCH#MIO MISO MOD MOSI MSB MTEMP MTS meters megabytes of memory Positive Analog Output Channel Number signal Negative Analog Output Channel Number signal multifunction I/O Master-In-Slave-Out signal Module Number bit Master-Out-Slave-In signal most significant bit Multiplexed Temperature Sensor signal multiplexed temperature sensor N NRSE nonreferenced single-ended (input) O ONCE OUTREF Once bit Output Reference signal P ppm parts per million R RAM RD RESET* rms RSE RSVD RTD RTE
Glossary sec SERCLK SERDATIN SERDATOUT SL SLOT0SEL* SPI SPICLK SS* seconds Serial Clock signal Serial Data In signal Serial Data Out signal Slot bit Slot 0 Select signal Serial Peripheral Interface Serial Peripheral Interface Clock signal Slot Select signal T tempco TRIG0 temperature coefficient Trigger 0 signal U UL Underwriters Laboratory V V V+ VVDC VIH VIL VOH VOL Vrms volts Positive Analog Supply signal Negative Analog Supply signal volts direct current input logic high voltage input logic low
Index Numbers/Symbols AOGND signal analog output signal connections, 2-26 rear signal connector, 2-25, B-2 +5 V signal front connector, 2-13, D-2 SCXIbus connector, 3-4, C-3 B bit descriptions AB0EN, 4-4 CHAN<2..0>, 4-3 CHS<4..0>, 4-6 CLKEN, 4-7 CLKOUTEN, 4-3 CLKSELECT, 4-3 CNT<6..0>, 4-8 FOUTEN*, 4-4 FRT, 4-7 HSRS*, 4-7 LOAD*, 4-7 MOD<3..0>, 4-8 ONCE, 4-7 RD, 4-7 RSVD, 4-4, 4-7 RTEMP, 4-4 SCANCLKEN, 4-4 SCANCONEN, 4-4, 4-7 SL<3..
Index serial data timing diagram, 2-30 slot-select procedure, 2-28 to 2-29 slot-select timing diagram, 2-29 writing to Configuration Register, 2-30 configuration. See also signal connections.
Index SCXI-1320 terminal block connecting, 2-17 to 2-18 installation, 2-23 jumper configuration, 2-19 parts locator diagram, 2-21 signal connection, 2-20 temperature sensor, 2-18 SCXI-1328 terminal block connecting, 2-17 to 2-18 installation, 2-23 jumper configuration, 2-19 to 2-20 parts locator diagram, 2-22 signal connection, 2-20 temperature sensor, 2-18 to 2-19 SCXI-1330 connector-and-shell assembly, 2-16 to 2-17 signal descriptions, 2-13, D-2 temperature sensor connection, 2-15 FRT bit, 4-7 functional
Index M 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* signal description of, 3-4, C-3 jumper connection, 2-4, 2-5 and SPI bus, 3-5 manual. See documentation.
Index N acquisition enable, triggering, and servicing, 5-12 data acquisition and board programming, 5-6 to 5-8 Counter 1 and SCANDIV, 5-8 module programming, 5-8 to 5-10 channel scanning from other modules, 5-9 channel scanning from SCXI-1120 via another module, 5-9 multiple-chassis scanning, 5-10 multiple-module multiplexed scanning, 5-9 to 5-10 single-module multiplexed scanning (direct), 5-9 single-module multiplexed scanning (indirect), 5-9 single-module parallel scanning, 5-8 Slot 0 hardscan circuitr
Index module programming, 5-8 to 5-10 channel scanning from other modules, 5-9 channel scanning from SCXI-1120 via another module, 5-9 multiple-chassis scanning, 5-10 multiple-module multiplexed scanning, 5-9 to 5-10 single-module multiplexed scanning (direct), 5-9 single-module multiplexed scanning (indirect), 5-9 single-module parallel scanning, 5-8 programming, 5-5 to 5-12 acquisition enable, triggering, and servicing, 5-12 data acquisition and board programming, 5-6 to 5-8 Counter 1 and SCANDIV, 5-8 sc
Index SCXI-1350 multichassis adapter cable assembly, E-10 installation, E-10 to E-11 SCXI-1351 one-slot cable extender cable assembly, E-9 installation, E-10 SCXIbus connector pin assignments, 3-3, C-2 pin equivalences with rear signal connector, 3-5 with rear signal connector and data acquisition boards, 2-27, 5-2 signal descriptions, 3-4 to 3-5, C-3 to C-4 SERCLK signal communicating on SPI bus, 2-28 to 2-31 digital I/O signal connections, 2-26, 2-27 rear signal connector, 2-25, B-2 register selection an
Index register selection and write procedure, 5-2 to 5-3 slot-select timing diagram, 2-29 writing 16-bit-slot select number, 2-29 SLOT0SEL* signal communicating on SPI bus, 2-28 to 2-31 digital I/O signal connections, 2-26 to 2-27 jumper connection, 2-4, 2-5 programming hardscan circuitry, 5-11 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 equiv
Index 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, 3-13 to 3-16 multiple-chassis scanning, 3-16 multiple-module multiplexed scanning, 3-15 to 3-16 single-module multiplexed scanning, 3-14 to 3-15 single-module parallel scanning, 3-14 SCXIbus connector equivalents for rear signa
