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National Instruments SCXI-1120 User's Manual

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1. Connects SCXIbus guard to the analog reference Enables the Pseudodifferential Reference mode pin 19 of the rear signal connector is connected to the analog reference Direct Temperature Connection Jumper W41 When your SCXI 1120 is operating with a data acquisition board configured in a differential mode such as the MIO board you can access the temperature sensor only in the Multiplexed Output mode Direct temperature connection is not permissible to the data acquisition board This is the factory setting and is position 1 of the jumper block Position 3 is not explicitly marked If the temperature sensor needs to be accessed in parallel with the other eight outputs or scanned without software interference along with the other channels you need to place W41 in position 3 this position is not explicitly marked on the module and to configure your reference to pseudodifferential or single ended operation jumper W46 with your data acquisition board configured for the same reference scheme In this position the direct temperature sensor connection is made on pin 18 of the rear signal connector and corresponds to ACH15 of the MIO boards or the PC LPM 16 SCXI 1120 User Manual 2 8 National Instruments Corporation Chapter 2 Configuration and Installation Table 2 3 Jumper W41 Settings Temperature sensor accessed in MTS mode Factory setting Temperature sensor accessed in DTS mode data acquisition board configure
2. 5 6 Write binary 101S 1110 to the HSCR 7 Write binary 101S 1111 to the HSCR In the preceding steps S 0 if you want the scanning to repeat when the end of the list is reached S 1 if you want the circuitry to shut down after a single scan When you are writing multiple entries to the same register for example repetitive writes to the HSCR or several FIFO entries it is important that SS 13 or SS 14 go inactive high between each entry Select another slot or toggle the SLOTOSEL line to temporarily deassert the appropriate SS line If consecutive scan list entries access an SCXI 1120 the module will reload the MUXCOUNTER with the starting channel after each entry Thus two entries with counts of four for one module will yield different behavior than one entry with a count of eight For multiple chassis scanning program each Slot 0 with dummy entries to fill the sample counts when the data acquisition board is accessing other chassis Use Slot 13 as the dummy entry slot See Example 3 at the end of this chapter National Instruments Corporation 5 11 SCXI 1120 User Manual Programming Chapter 5 4 Acquisition Enable Triggering and Servicing At this point you should now continue from where you left off in the 7 Data Acquisition Board Setup Programming section of this chapter Perform the following steps given in your data acquisition board user manual e MIO board user manual Enab
3. MOD3 MOD2 MOD 7 6 5 3 2 1 0 MODO CNT6 CNT5 CNT4 CNT3 CNT2 CNTI CNTO Bit 15 11 10 7 Name X MOD lt 3 0 gt CNT lt 6 0 gt SCXI 1120 User Manual Description Don t care bits Unused Module Number The value of these bits plus one determines the number of the slot to be accessed for this scan entry For example to access Slot 6 MOD lt 3 0 gt would be 0101 Count The value of these bits plus one determines how many samples will be taken before the next scan list entry becomes active A value of zero corresponds to one sample and a value of 127 corresponds to 128 samples 4 8 National Instruments Corporation 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 the data acquisition boards involves writes to their registers See your data acquisition board user manual for more information The programming instructions list the sequence of steps to take The instructions are language independent that is they instruct you to write a value to a given register without presenting the actual code
4. SERDATIN DAQD A SLOTOSEL DIG GND SERCLK Chapter 2 DIG GND SERDATOUT SCANCLK Figure 2 11 SCXI 1120 Rear Signal Connector Pin Assignment SCXI 1120 User Manual 2 24 National Instruments Corporation 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 RO 3 18 MCHO through MCH7 Analog Output Channels 0 through 7 Connects to the data acquisition board differential analog input channels 19 OUTREF Output Reference Serves as the reference node for the analog output channels and the temperature sensor in the DTS mode in the Pseudodifferential Reference mode It should be connected to the analog input sense of the NRSE data acquisition board 24 33 DIG GND Digital Ground Supply the reference for data acquisition board digital signals and are tied to the module digital ground 25 SERDATIN Serial Data In Taps into the SCXIbus MOSI line to provide serial input data to a module or Slot 0 26 SERDATOUT Serial Data Out Taps into the SCXIbus MISO line to accept serial output data from a module 27 DAQD A Data Acquisition Board Data Address Line Taps into the SCXIbus D A line to indicate to the module whether the incoming serial stream is data or address information 29 SLOTOSEL Slot 0 Select Taps into the
5. 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 signal connector 3 5 pin assignments 3 3 signal descriptions 3 4 to 3 5 timing signal SCANCLK 2 28 TRIGO signal 3 5 C 4 U unpacking the SCXI 1120 1 4 V V signal 3 4 C 3 V signal 3 4 C 3 SCXI 1120 User Manual Index 9 Index National Instruments Corporation
6. Clock Clocks the serial data on the MOSI and MISO lines Open collector I O Master Out Slave In Transmits data from the SCXIbus to the module Open collector I O C 3 SCXI 1120 User Manual SCXIbus Connector Pin Signal Name A24 TRIGO B24 SS C24 SCANCON All other pins are not connected Appendix C Description continued TRIGO 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 Slot Select When low enables module communications over the SCXIbus Totem pole Input Scanning Control Combination output enable and reload signal for scanning operations Totem pole Input Further information is given in Chapter 3 Theory of Operation SCXI 1120 User Manual C 4 National Instruments Corporation 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 Signal Column Signal INumber Name A B C Name Rm SRB RB mee NON NNN NN NN WN W W W D RUAN 0 ND R DU AO Or WN ND DU OA 1 WO CF Figure D 1 SCXI 1120 Front Connector Pin Assignment National Instruments Corporation D 1 SCXI 1120 User Manual SCXI 1120 Front Connector Appendix D Front Connector Signal Des
7. National Instruments Corporation Index Numbers Symbols 5 V signal front connector 2 13 D 2 SCXIbus connector 3 4 C 3 A ABO signal 3 4 ABO signal 3 4 ABOEN bit 4 4 AC coupled signal connection with high common mode voltage 2 15 analog configuration direct temperature connection jumper W41 2 8 to 2 9 filter jumpers 2 10 gain jumpers 2 9 to 2 10 grounding shielding and reference mode selection jumper W46 2 7 analog input channels analog input block diagram 3 9 calibration 3 10 to 3 12 equipment requirements 3 10 to 3 11 offset null adjust 3 11 potentiometers reference designators 3 12 formula for determining overall gain 3 10 front connector 2 12 to 2 13 C 3 C 3 AC coupled signal connection 2 15 floating AC coupled signal connection 2 14 floating signal connection 2 14 ground referenced signal connection 2 14 warning against exceeding input range 2 15 theory of operation 3 8 to 3 10 analog input specifications A 1 to A 2 analog output circuitry 3 12 to 3 13 analog output signal connections 2 26 SCXI 1120 User Manual Index 1 AOGND signal B analog output signal connections 2 26 rear signal connector 2 25 B 2 bit descriptions C ABOEN 4 4 CHAN lt 2 0 gt 4 3 CHS lt 4 0 gt 4 6 CLKEN 4 7 CLKOUTEN 4 3 CLKSELECT 4 3 CNT lt 6 0 gt 4 8 FOUTEN 4 4 FRT 4 7 HSRS 4 7 LOAD 4 7 MOD lt 3 0 gt 4 8 ONCE 4 7 RD 4 7 RSVD 4 4 4 7
8. RTEMP 4 4 SCANCLKEN 4 4 SCANCONEN 4 4 4 7 SL lt 3 0 gt 4 6 cabling custom cables 1 4 part numbers for custom cables 1 4 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 procedure E 8 to E 9 SCXI 1340 cable assembly E 1 to E 2 installation E 2 to E 3 National Instruments Corporation Index 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 to E 4 installation E 4 to E 5 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 calibration 3 10 to 3 12 equipment requirements 3 10 to 3 11 offset null adjust 3 11 potentiometers reference designators 3 12 CH3 through CHO signal 5 3 CH7 through CHO signal 2 13 D 2 CH7 through CHO signal 2 13 D 2 CHAN lt 2 0 gt bit 4 3 channel scanning from other modules 5 9 from SCXI 1120 via another module 5 9 CHS lt 4 0 gt bit 4 6 CHSGND signal front connector 2 13 D 2 SCXIbus connector 3 4 C 3 CLKEN bit 4 7 CLKOUTEN bit 4 3 CLKSELECT bit 4 3 CNT lt 6 0 gt bit 4 8 cold junction sensor
9. The adapter board gives the PC LPM 16 full access to the digital control lines and analog signals but the PC LPM 16 cannot scan channels in the Multiplexed mode Leave jumper W1 in position A on the SCXI 1342 The SCXI 1120 does not use jumper W1 Table E 3 lists the SCXI 1342 pin translations Table E 3 SCXI 1342 Pin Translations PC LPM 16 Pin PC LPM 16 Signal Rear Signal SCXI 1120 Use Connector Pin AOGND MCHO MCHO MCHI1 MCHI1 MCH2 MCH 2 MCH3 MCH3 MCH4 MCH4 MCH5 MCHS MCH6 MCH6 MCH7 MCH7 DIG GND SERDATOUT No Connect SERDATIN DAQD A continues National Instruments Corporation E 5 SCXI 1120 User Manual SCXI 1120 Cabling Appendix E Table E 3 SCXI 1342 Pin Translations Continued PC LPM 16 Pin PC LPM 16 Signal Rear Signal SCXI 1120 Use Connector Pin SLOTOSEL 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 Install the SCXI module to which the SCXI 1342 will connect 3 Connect one end of the ribbon cable to the adapter board rear connector 4 Plug the adapter board front connector onto the module rear signal connector Make sure a corner of the adapter board enters the upper module guide of the chassis 5 Screw the rear panel to the threaded strips in the re
10. cable the SCXI 1120 to a data acquisition board 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 ABOEN in the Configuration Register will ensure that its output is not driving ABO 2 Write the binary pattern 1OXXXXXX XX100011 to the SCXI 1120 Configuration Register This step disables the SCXI 1120 from driving Analog Bus 0 and allows Analog Bus 0 to drive MCHO through the output buffer 3 Program the other module to be scanned Channel Scanning from the SCXI 1120 via Another Module To scan the SCXI 1120 via other modules you must cable the other module to a data acquisition board and the other module must be able to transfer Analog Bus 0 to the data acquisition board The other module must also be able to send a SCANCLK compatible signal on TRIGO 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 ABOEN in the Configuration Register will ensure that its output is not driving ABO 2 Program the other module not to drive Analog Bus 0 but to send Analog Bus 0 to the data acquisition board Also program the other module to send a SCANCLK compatible signal to TRIGO 3 Write the
11. channels 7 through 0 respectively C30 C32 The signals on the front connector are all analog with the exceptions of pins A6 C6 and C8 The analog signals can be divided into two groups the analog input channels and the temperature sensor Analog Input Channels The positive input channels are located in column A Their corresponding negative input channels are located in column C Each input corresponds to a separate amplifier and is fully isolated from the other channels and from earth ground The inputs are designed in a floating single ended configuration thus the measured signal can be referenced to a ground level with common mode voltage up to 250 Vrms For better noise immunity connect the negative input channel to the signal reference If the measured signals are floating connect the negative input channel to chassis ground on the terminal block Figure 2 4 shows how to connect a ground referenced signal Figure 2 5 shows how to connect a floating signal Figures 2 6 and 2 7 show how to connect AC coupled signals National Instruments Corporation 2 13 SCXI 1120 User Manual Configuration and Installation Chapter 2 Module Module Figure 2 5 Floating Signal Connection Referenced to Chassis Ground for Better Signal to Noise Ratio Module Figure 2 6 Floating AC Coupled Signal Connection SCXI 1120 User Manual 2 14 National Instruments Corporation Chapter 2 Configuration and Installation Module Fi
12. 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 SERDATIN DAQD A SLOTOSEL DIG GND SERCLK DIG GND SERDATOUT SCANCLK Figure B 1 SCXI 1120 Rear Signal Connector Pin Assignment National Instruments Corporation B 1 SCXI 1120 User Manual 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 RO 3 18 MCHO through MCH7 Analog Output Channels 0 through 7 Connects to the data acquisition board differential analog inputchannels 19 OUTREF Output Reference Serves as the reference node for the analog output channels and the temperature sensor in the DTS mode in the Pseudodifferential Reference mode It should be connected to the analog input sense of the NRSE data acquisition board 24 33 DIG GND Digital Ground Supply the reference for data acquisition board digital signals and are tied to the module digital ground 25 SERDATIN Serial Data In Taps into the SCXIbus MOSI line to provide serial input data to a module or Slot 0 26 SERDATOUT Serial Data Out Taps into the SCXIbus MISO line to accept serial output data from a module 27 DAQD A Data Acquisition Board Data Address Line Taps into the SCXIbus D A line to in
13. 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 TRIGO Thigh Tlow Time low before rising edge 400 nsec minimum Thigh Time high before falling edge 250 nsec minimum Figure 2 12 SCANCLK Timing Requirements For output selection time specifications refer to Appendix A Specifications Communication Signals This section describes the methods for communicating on the Serial Peripheral Interface SPI bus and their timing requirements The communication signals are SERDATIN DAQD A SLOTOSEL SERDATOUT and SERCLK Furthermore SS is produced by Slot 0 according to data acquisition board programming and SS timing relationships will also be discussed For information on the Slot 0 Slot Select Register consult Chapter 4 Register Descriptions The data acquisition board determines to which slot it will talk by writing a slot select number to Slot 0 In the case of an SCXI 1001 chassis this write also determines to which chassis the data acquisition board will talk Writing a slot select number is also used in programming the Slot 0 hardscan circuitry See Chapter 5 Programming for information on programming the Slot 0 hardscan circuitry The following sections detail the procedure for selecting a slot in a parti
14. SPI bus 3 5 Revision A and B SCXI 1120 signal conditioning module detailed parts locator diagram F 3 general parts locator diagram F 2 photograph F 1 RSVD bit 4 4 4 7 RSVD signal front connector 2 13 D 2 rear signal connector 2 25 B 2 SCXIbus connector 3 4 C 3 RTEMP bit 4 4 S SCANCLK signal analog output 3 13 module programming 5 9 multiplexed scanning 3 14 to 3 15 rear signal connector 2 25 B 2 timing requirements 2 28 SCANCLKEN bit 4 4 SCANCON signal analog output 3 13 multiplexed scanning 3 14 to 3 15 SCXIbus connector 3 5 C 4 SCANCONEN bit 4 4 4 7 scanning measurements National Instruments Corporation 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 scanning examples 5 12 to 5 15 Slot 0 hardscan circuitry 5 10 to 5 11 scanning modes theory of operation 3 13 to 3 16 multiplexed scanning 3 14 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 s
15. binary pattern 01XXXCCC XX001111 to the SCXI 1120 Configuration Register where CCC is the starting channel number Multiple Module Multiplexed Scanning To scan multiple modules you must connect one module to the data acquisition board and the module must be able to transfer Analog Bus 0 to the data acquisition board This module must National Instruments Corporation 5 9 SCXI 1120 User Manual Programming Chapter 5 also be able to send a SCANCLK compatible signal on TRIGO 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 ABOEN in the Configuration Register will ensure that its output is not driving ABO 2 Program the module that is connected to the data acquisition board to connect Analog Bus 0 to the data acquisition board but not drive Analog Bus 0 unless it is receiving an active low signal on SCANCON Also program the module to send a SCANCLK compatible signal onto TRIGO If this module is an SCXI 1120 this programming is accomplished by writing the binary pattern 10XXXCCC XX001111 to its Configuration Register Note If this module is an SCXI 1120 and is not going to be scanned it is just being used as an interface write a 0 to bit 2 SCANCONEN in the Configuration Register The start channel bits become don t care bits 3 Program the othe
16. 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 Type Write only Word Size 8 bit Bit Map 7 6 5 4 3 2 1 0 __RSVD Rr RD ONCE HsRs LOAD SCANCONEN _ CLKEN Bit Name Description 7 RSVD Reserved 6 FRT Forced Retransmit This bit when clear causes the scan list in the FIFO to be reinitialized to the first entry thus allowing the scan list to be reprogrammed in two steps instead of having to rewrite the entire list When this bit is set it has no effect 5 RD Read This bit when clear prevents the FIFO from being read When set the FIFO is being read except at the end of a scan list entry during scanning when reading is briefly disabled to advance to the next scan list entry 4 ONCE Once When set this bit will cause the Hardscan circuitry to shut down at the end of the scan list circuitry during a data acquisition When clear the circuitry will wrap around and continue seamlessly with the first scan list entry after the entry is finished 3 HSRS Hardscan Reset When clear this bit causes all the hardware scanning circuitry including the FIFO to
17. digital timing signals The digital input signals are pins 24 25 27 29 33 and 37 The data acquisition board uses these pins to configure the SCXI module that is under data acquisition board control Each digital line emulates the SCXIbus communication signals as follows Pin 25 is SERDATIN and is equivalent to the SCXIbus MOSI serial data input line e Pin 27 is DAQD A and is equivalent to the SCXIbus D A line It indicates to the module whether the incoming serial stream on SERDATIN is data DAQD A 0 or address DAQD A 1 information e Pin 29 is SLOTOSEL and is equivalent to the SCXIbus INTR line It indicates whether the data on the SERDATIN line is being sent to Slot 0 SLOTOSEL 0 or to a module SLOTOSEL 1 e Pins 24 and 33 are the digital ground references for the data acquisition board digital signals and are tied to the module digital ground e Pin 37 is SERCLK and is equivalent to the SCXIbus SPICLK line and is used to clock the serial data on the SERDATIN line into the module registers SCXI 1120 User Manual 2 26 National Instruments Corporation Chapter 2 Configuration and Installation The digital output signal is pin 26 e 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 mat
18. perform only single channel reads in this mode You can also use the SCXI 1120 with other systems that comply with the specifications given in Chapter 2 Configuration and Installation You can multiplex several SCXI 1120s into a single channel thus greatly increasing the number of analog input signals that can be digitized The addition of a shielded terminal block provides screw terminals for easy signal attachment to the SCXI 1120 In addition a temperature sensor for cold junction compensation of thermocouples is included on the terminal block This cold junction reference CJR is either multiplexed along with the eight channels or connected by jumpers to a different channel of the data acquisition board With the SCXI 1120 the SCXI chassis can serve as a fast scanning signal conditioner for laboratory testing production testing and industrial process monitoring National Instruments Corporation 1 1 SCXI 1120 User Manual 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 181695 01 SCXI 1120 User Manual 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 When you
19. specifications A 2 to A 3 communication signals for SPI bus 2 28 to 2 31 Configuration Register write timing diagram 2 31 Module ID Register timing diagram 2 31 National Instruments Corporation 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 analog configuration direct temperature connection jumper W41 2 8 to 2 9 filter jumpers 2 10 gain jumpers 2 9 to 2 10 grounding shielding and reference mode selection jumper W46 2 7 to 2 8 digital signal connections 2 4 to 2 7 jumper settings table 2 6 to 2 7 jumper W42 2 5 jumper W43 2 5 jumper W44 2 5 using jumpers W42 and W43 2 5 to 2 6 fixed jumpers 2 4 parts locator diagrams detailed diagram 2 3 general diagram 2 2 SCXI 1320 terminal block jumper configuration 2 19 SCXI 1328 terminal block jumper configuration 2 18 to 2 19 user configurable jumpers 2 4 Configuration Register description of 4 3 to 4 4 write procedure 2 30 to 2 31 3 7 connector and shell assembly See SCXI 1330 connector and shell assembly customer communication xiii G 1 D D A signal description of 3 4 C 3 digital control circuitry 3 7 and SPI bus 3 5 DAQD A signal communicating on SPI bus 2 28 to 2 31 digital I O signal connections 2 26 to 2 27 rear signal connector 2 25 B 2 SCXI 1120 User Manual register selection an
20. temperature connection 2 8 to 2 9 W46 grounding shielding and reference mode selection 2 7 L Lab LC cable assembly See SCXI 1344 Lab NB cable assembly See SCXI 1341 Lab PC or Lab PC cable assembly See SCXI 1341 LabVIEW software 1 2 to 1 3 LOAD bit 4 7 National Instruments Corporation M manual See documentation MCHO through MCH7z signal analog output signal connections 2 26 3 13 rear signal connector 2 25 B 2 MISO signal description of 3 4 C 3 digital control circuitry 3 8 jumper connection 2 4 2 5 2 6 and SPI bus 3 5 MOD lt 3 0 gt bit 4 8 module configuration See configuration Module ID Register description of 4 2 theory of operation 3 8 timing diagram 2 31 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 indirect 5 9 single module parallel scanning 5 8 MOSI signal description of 3 4 C 3 digital control circuitry 3 7 and SPI bus 3 5 MTEMP signal analog output 3 13 front connector 2 13 D 2 measurements via another module 5 5 multiplexed output 5 4 multiplexed scanning 3 14 to 3 16 multiple chassis scanning 3 16 5 10 multiple module multiplexed scanning 3 15 to 3 16 5 9 to 5 10 single module multiplexed scanning 3 14 to 3 15 direct 3 14 5 9
21. the SCXI 1328 isothermal terminal block has a high accuracy onboard temperature sensor The terminal block kits are listed in the Optional Equipment section in Chapter 1 Introduction The SCXI 1320 terminal block and SCXI 1328 high accuracy isothermal terminal block consist of a shielded board with supports for connection to the SCXI 1120 input connector The terminal blocks have 18 screw terminals for easy connection Eight pairs of screw terminals are for signal connection to the eight inputs of the SCXI 1120 and one pair of screw terminals connects to the chassis ground National Instruments Corporation 2 17 SCXI 1120 User Manual 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 242 Vrms are present you must connect the safety earth ground to the strain relief tab This complies with UL 1244 and protects against electric shock when the terminal block is not connected to the chassis To connect the safety earth ground to the strain relief tab run an earth ground wire in the cable from the signal source to the terminal block National Instruments is not liable for any damages or injur
22. the channel bandwidth For example to achieve a gain of 100 use Gj 10 and Gong 10 for a gain of 1 000 use Gist 50 and Gong 20 All the amplifier input channels are overvoltage protected to 240 Vrms with power on or off The isolated amplifiers fulfill two purposes on the SCXI 1120 module They convert a small signal riding on a high common mode voltage into a single ended signal with respect to the SCXI 1120 chassis ground With this conversion the input analog signal can be extracted from a high common mode voltage or noise before being sampled and converted by the data acquisition board The isolated amplifier also amplifies and conditions an input signal which results in an increase in measurement resolution and accuracy After isolation further filtering is available to increase the noise immunity of the amplifier channel It is important to note that the overall amplifier bandwidth is determined by both filtering stages so to achieve the required bandwidth both filtering sections should be set the same as indicated in Chapter 2 Configuration and Installation Calibration Calibration Equipment Requirements For best measurement results calibrate the SCXI 1120 so that its offset is adjusted to 0 3 mV RTO and 0 6 uV RTI No special equipment is needed other than a regular voltmeter with the following specifications e Range 30 mV to 300 mV e Resolution 3 1 2 digits or greater SCXI 1120 User Manual 3 10
23. this font denotes text or characters that are to be literally input from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions variables filenames and extensions and for statements and comments taken from program code NB refers to the NuBus series computers PC refers to the IBM PC XT the IBM PC AT and compatible computers SCXIbus refers to the backplane in the chassis A signal on the backplane is referred to as the SCXIbus lt signal name gt line or signal The xii National Instruments Corporation 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 Related Documentation The following documents contain information that you may find helpful as you read this manual e Your DAQ board user manual e Your SCXI chassis user manual Customer Communication National Instruments wants to receive your comments on our products and manuals We are interested in the applications you develop with our products and we want to help if you have problems with them To make it easy for you
24. to 2 20 2 22 to 2 23 SCXI 1330 connector and shell assembly 2 16 to 2 17 signal descriptions 2 13 D 2 National Instruments Corporation Index 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 SCXIbus pin equivalences 3 5 signal descriptions 2 25 B 2 timing signal 2 28 SCXI 1320 terminal block 2 20 SCXI 1328 terminal block 2 20 SCXIbus connector pin assignments 3 3 C 2 pin equivalences with rear signal connector 3 5 pin equivalences with rear signal connector and data acquisition boards 2 27 5 2 signal descriptions 3 4 to 3 5 C 3 to C 4 warning against exceeding maximum ratings 2 11 single channel measurements 5 3 to 5 5 direct measurements 5 3 to 5 4 indirect measurements 5 4 to 5 5 measurements from other modules 5 4 measurements from SCXI 1120 via another module 5 4 to 5 5 multiplexed output 5 4 parallel output 5 3 single module multiplexed scanning direct 5 9 indirect 5 9 theory of operation 3 14 to 3 15 single module parallel scanning 3 14 5 8 SL lt 3 0 gt bit 4 6 Slot 0 hardscan circuitry programming 5 10 to 5 11 Slot 0 registers 4 5 to 4 8 FIFO Register 4 8 Hardscan Control Register HSCR 4 7 Slot Select Register 4 6 slot selection National In
25. to 0 58 V from 0 to 55 C Includes the combined effects of the SCXI 1120 and the AT MIO 16F 5 2Includes the combined effects of the SCXI 1120 and the AT MIO 16X 3Located on the SCXI 1320 and SCXI 1328 terminal blocks ncludes the combined effects of the temperature sensor accuracy and the temperature difference between the temperature sensor and any screw terminal SModule tested using the UL 1244 standard to twice the working voltage 1 000 Vrms SCXI 1120 User Manual A 2 National Instruments Corporation Appendix A Specifications Note You can find the temperature T C as follows T C Tk 273 15 where TK is the temperature in kelvin 1 Tx 3 a b inRr e InRr a 1 288 x 10 b 2 356 x 104 c 9 556 x 10 8 Rr resistance of the thermistor in Q Rr 50 oo VTEMPOUT 5 V TEMPOUT VTEMPOUT Output voltage of the temperature sensor Physical Dimensions 1 2 by 6 8 by 8 0 in Connectors 50 pin male ribbon cable rear connector 32 pin DIN C male front connector 18 screw terminal adapter available Operating Environment Temperature 0 to 50 C Relative humidity 5 to 90 at 35 C Storage Environment Temperature 55 to 150 C 55 to 125 C for the SCXI 1328 Relative humidity 5 to 90 noncondensing National Instruments Corporation A 3 SCXI 1120 User Manual Appendix B Rear Signal Connector This appendix describes the pinout and signal names for the SCXI 1120
26. to the data acquisition board 3 Write the binary pattern OOXXXCCC XX000010 to the SCXI 1120 Configuration Register 4 Measure the voltage with the data acquisition board To measure the voltage on the MTEMP line perform the following steps 1 Perform any necessary programming to ensure that no modules are driving Analog Bus 0 For an SCXI 1120 clearing ABOEN in the Configuration Register will ensure that its output is not driving ABO 2 Program the other module not to drive Analog Bus 0 but to send Analog Bus 0 to the data acquisition board 3 Write the binary pattern OOXXXXXX XX100010 to the SCXI 1120 Configuration Register 4 Measure the voltage with the data acquisition board Scanning Measurements Programming for scanned data acquisition involves programming your data acquisition board modules and Slot 0 In general the steps to be taken are as follows 1 Perform all data acquisition board programming to the point of enabling the data acquisition 2 Perform all module programming 3 Program the Slot 0 hardscan circuitry 4 Enable the data acquisition trigger it either through software or hardware and service the data acquisition The MIO boards can do all types of scanning Lab NB Lab PC Lab PC Lab LC and PC LPM 16 boards support only single module parallel scanning and do not support any of the multiplexed scanning modes Notice that single module parallel scanning is typically done without any mo
27. 0 powers up with its Configuration register cleared to all zeros You can force this state by sending an active low signal on the RESET pin of the SCXIbus connector In the reset state CHO through CH3 are routed to MCHO through MCH3 on the rear signal connector The module is disconnected from Analog Bus 0 and disabled from scanning Single Channel Measurements This section describes how to program the SCXI 1120 either alone or in conjunction with other modules to make single channel or nonscanned measurements Direct Measurements Parallel Output To perform a parallel output measurement you must cable the SCXI 1120 rear signal connector to a data acquisition board with each output connected to a different data acquisition board channel 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 Remember to account for the gains of both the SCXI 1120 and the data acquisition board when calculating the actual voltage present at the input of the SCXI 1120 To measure one of the eight differential input channels to the SCXI 1120 or the DTEMP line if the module has been configured appropriately perform the following steps 1 Write the binary pattern 00XXX000 XX000000 to the SCXI 1120 Configuration Register Notice that this can be the RESET state 2 Measure the voltage with the data a
28. 120 User Manual E 2 National Instruments Corporation 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 Mounting Bracket Rear Panel Connector r Step 4 50 Pin Female Connector to MIO 16 Board D O O O O AARAAAAAARAAAAAAAAAAAARAAAAAAAIAIAIS BEBE Step 4 Male Breakout Connector SCXI 1120 Rear Signal Connector Mounting Bracket Figure E 1 SCXI 1340 Installation SCXI 1341 Lab NB Lab PC or Lab PC and SCXI 1344 Lab LC Cable Assembly The SCXI 1341 Lab NB Lab PC or Lab PC cable assembly connects a Lab NB Lab PC or Lab PC board to an SCXI 1120 module The SCXI 1344 Lab LC cable assembly connects a Lab LC board to an SCXI 1120 module The SCXI 1341 and SCXI 1344 cable assemblies consist of two pieces an adapter board and a 50 conductor ribbon cable that connects the Lab board to the rear connector of the adapter board The adapter board converts the signals from the Lab board I O connector to a format compatible with the SCXI 1120
29. 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 overview See theory of operation G gain jumpers 2 9 to 2 10 ground referenced signal connection with high common mode voltage 2 14 grounding jumper W46 2 7 GUARD signal 3 4 C 3 H hardscan circuitry programming 5 10 to 5 11 Hardscan Control Register HSCR 4 7 hardware installation 2 11 HSRS bit 4 7 I installation hardware installation 2 11 SCXI 1180 feedthrough panel E 6 to E 8 SCXI 1302 50 pin terminal block E 9 SCXI 1320 terminal block 2 23 National Instruments Corporation Index 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 J jumpers digital signal connections jumper settings table 2 6 to 2 7 W42 2 5 to 2 6 W43 2 5 to 2 6 W44 2 5 filter jumpers 2 10 fixed jumpers 2 4 gain jumpers 2 9 to 2 10 SCXI 1320 terminal block jumper configuration 2 19 SCXI 1328 terminal block jumper configuration 2 19 to 2 20 user configurable jumpers 2 4 W41 direct
30. I 1120 Front Connector Pin Assignment ceecceeeseceesteceesteeeenneeeeaaees D 1 SCXI 1340 iS ta AE OW ELA TARN Se RATE a eiae nm E 3 SCXI 1180 Rear Connections dent dieu E 7 SCXI 1180 Front Panel Installation E 8 Cover Removal SE ss cots i tected Sate den can NU ei tn nee d mn tas E 9 Revision A and B SCXI 1120 Signal Conditioning Module F 1 Revision A and B SCXI 1120 General Parts Locator Diagram F 2 Revision A and B SCXI 1120 Detailed Parts Locator Diagram 0 0 0 F 3 SCXI 1120 User Manual Contents Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Tables Digital Signal Connections Jumper Settings 2 6 Jumper WAG Settings menssa e me ON VS eae 2 8 Jumper MAL SOLE SN ROO Cee Pe et ERED ree ne A ee ir tre Re A Rete Pe 2 9 Crain Jumper AUOCAUOMN se te Sete ee MN tas ete ies Meco 2 9 G in Jumper POSIAONS es Ra n a a T E 2 10 Filter Jumper Allocation sessirnir iinis neii iiai 2 10 Jumper Settings on the SCXI 1320 Terminal Block seseseeeeeeeeeeeereeesreee 2 19 Jumper Settings on the SCXI 1328 Terminal Block eee eee eeseeeeeeeeeees 2 20 SCXIbus to SCXI 1120 Rear Signal Connector to Data Acquisition Board Pin Equivalence rssi si e i ais 2 27 SCXIbus Equivalents for the Rear Signal Connector esesseeeeesereereesrsereress 3 5 Calibration Potentiometers Reference Designators sssseseseesssseesseessersseresee
31. IV secs tiesoe eectetesccesitiinves cceeetion eieabiaees 5 8 2 Module Programming 2a c4 s0siccdscehedesaassgssdanbhosntdesanncnantavevenss intense 5 8 Single Module Parallel Scanning 5 8 Single Module Multiplexed Scanning Direct 5 9 Single Module Multiplexed Scanning Indirect ee 5 9 Channel Scanning from Other Modules 5 9 Channel Scanning From the SCXI 1120 via Another Dt ie sam a en eee ttes 5 9 Multiple Module Multiplexed Scanning 5 9 Multiple Chassis Scanning 5 10 3 Programming the Slot O Hardscan Circuitry 00 0 cece eeeeeeseeeeeeees 5 10 4 Acquisition Enable Triggering and Servicing 5 12 SCANS Examples ne a ie CSD ee iaa ne 5 12 IE ATS l en Seine dde tee 5 12 PRAT WC ss nt a TS ner ete nine ete eine 5 13 FER AMIS J dcanca de secetane soaa cas od sack py ssaa es e e seca ch bheeanee ca ets E e ani tentes 5 14 Appendix A Specifications LE 510 ait KO i di at OO nn A 1 Analog Input eee eeart i aes naib ough ray a sets sel aient A 1 Cold Junetion Sensor rs an intense eani a anai aias A 2 PASCALE NE SES a n e a a ay be E EE E S e A 3 Operating Environment isis scaecateacesgasejecasaeecdacdysededeeaseasadae saved guondeade A EEEE i iS A 3 Storage Environment san e n e E e A E a AAEE A 3 Appendix B Rear Signal Connector 0 0ccccccccccccssscsssseseseseseseseseseseseseseseseseseseseseseseseseseeeeeeeeeeeees B 1 Rear Signa
32. National Instruments Corporation 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 Set the DMM range to the smallest range that can measure 3 mV 2 Short the inputs of the DMM together and then to chassis ground 3 Record the measurement indicated by the DMM display This is the DMM inherent offset and it should be subtracted from subsequent measurements 4 Short the desired channel inputs together and then to chassis ground 5 Set the amplifier gain to 1 6 Connect the amplifier output to the DMM Make sure that the DMM can achieve the accuracy and resolution you need 7 Adjust the output potentiometer of the desired channel until the output is 0 3 mV 8 Set the DMM range to the smallest range that can measure 6 mV 9 Set the amplifier gain to 1 000 10 Adjust the input potentiometer of the desired channel until the output is 0 6 mV 11 Go to the next channel To avoid erroneous results when nulling the amplifier follow these steps in the order indicated You may seal the potentiometer
33. Notation For the bit patterns to be written the following symbols are used 0 binary zero 1 binary one X don t care either zero or one may be written one of three bits used to specify the channel to be loaded into the MUXCOUNTER This value will either be the channel to be read for single reads or a starting channel for scanned measurements The 16 bit patterns are presented MSB first left to right Register Writes This section describes how to write to the Configuration Register HSCR and FIFO Register including the procedure for writing to the Slot Select Register to select the appropriate slot For timing specifics refer to the Timing Requirements and Communication Protocol section in Chapter 2 Configuration and Installation The rear signal connector pin equivalences to the different National Instruments data acquisition boards are given in Table 5 1 Also see Appendix E SCXI 1120 Cabling The Configuration Register the HSCR and the FIFO Register are write only registers The different bits in these registers often control independent pieces of circuitry There are times when you may want to set or clear a specific bit or bits without affecting the remaining bits However a write to one of these registers will affect all bits simultaneously You cannot read the registers to determine which bits have been set or cleared in the past therefore you should maintain a software copy of these registers You can then read the s
34. Programming Multiple A D Conversions with Interval Scanning Programming Multiple A D Conversions in Single Channel Interval Acquisition Mode SCXI 1120 User Manual 5 6 National Instruments Corporation Chapter 5 Programming 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 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 Programming Multiple A D Conversions with Channel Scanning Follow the instructions in these sections through the part labeled as follows Clear the A D Circuitry and Reset the Mux Counter in the MIO board user manual except for the AT MIO 16X and AT MIO 64F 5 Do not continue to the part called Enable the Scanning Data Acquisition Operation You will do this after you have programmed the modules and Slot 0 Program the Sample Counter if you are doing continuous channel scanning or Program the Scan Interval Counter if you are doing interval channel scanning in the AT MIO 16X and AT MIO 64F 5 user manuals Do not continue to the part labeled Enable a Scanning Data Acquisition Operation or Enable an Interval Scanning Data Acquisition Operation You will do
35. 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 20 Canada Ontario 519 622 9310 Canada Qu bec 514 694 8521 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 24 Germany 089 741 31 30 Italy 02 48301892 Japan 03 3788 1921 Netherlands 03480 33466 Norway 32 848400 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 20 51 51 U K 0635 523545 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 A Return Material Authorization RMA number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty National Instrum
36. SCXIbus INTR line to indicate whether the information on MOST is being sent to a module or Slot 0 36 SCANCLK Scan Clock Indicates to the SCXI 1120 that a sample has been taken by the data acquisition board and causes the SCXI 1120 to change channels 37 SERCLK Serial Clock This signal taps into the SCXIbus SPICLK line to clock the data on the MOSI and MISO lines 43 RSVD Reserved All other pins are not connected See the Timing Requirements and Communication Protocol section later in this chapter for more detailed information on timing National Instruments Corporation 2 25 SCXI 1120 User Manual 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 AOGND is an analog output common signal that is routed through jumper W46 to the analog reference on the SCXI 1120 You can use these pins for a general analog power ground tie point to the SCXI 1120 if necessary In particular when using differential input data acquisition boards such as the MIO 16 board it is preferable to leave jumper W46 in its factory setting or in position AB RI to avoid ground loops With data acquisiti
37. SS is released and reasserted The SCXI 1120 module ID is hex 00000004 Analog and Timing Circuitry The SCXIbus provides analog power 18 5 VDC that is regulated on the SCXI 1120 to 15 VDC a guard an analog bus ABO and a chassis ground CHSGND ABO buses the SCXI 1120 output to other modules or receives outputs from other modules via the SCXIbus The guard guards the analog bus and can be connected via jumper W46 to the analog ground reference or can be left floating a connection can be made by another board The data acquisition board analog input and timing is the interface between the SCXI 1120 output and the data acquisition board This is described in the following section Analog Input Channels Figure 3 5 is a diagram of the analog input block SCXI 1120 User Manual 3 8 National Instruments Corporation Chapter 3 Theory of Operation Input Channel 0 gt To Output Stage LPF Input Channel 1 LPF To Output z Stage Input Channel 2 LPF To Output Stage Input Channel 3 LPF To Output Stage Input Channel 4 H 5 2 Q o g Z 3 Q Z g aa gt To Output Stage LPF Input Channel 5 gt To Output Stage LPF Input Channel 6 gt To Output Stage LPF Input Channel 7 LPF To Output at 5 Stage MTEMP V DTEMP Figure 3 5 Analog Input Block Diagram National Instruments Corporation 3 9 SCXI 1120 User Manual Theory of Oper
38. Wed se CE OT 2 5 Using Jumpers W42 and W43 oc eeeecesccecssececssececseeceeseeeeseeeetaeeenes 2 5 PTA COA UT AL DOE ec iee e EE A EER dc 2 7 Grounding Shielding and Reference Mode Selection ceeeee 2 7 Jamper W4O ARR AR ere nn Ma eees 2 7 Direct Temperature Connection is 2 sim endmaraan lines 2 8 Jumper ay ace eye Sin ee eae RTE nee 2 8 Gaii JUMPErS Sn nn en nd te ln net ed 2 9 Filt r JUMp rS ein ans nn rt ten de E tante 2 10 Hardware Installation Te es Rss e ent nn ea en sens 2 11 Signal CONNECTIONS nine Re UN E NAE seadanseduedadvansseae ees 2 11 Front Connecti Gri ch car te nn Re en on ESS aie 2 12 Front Connector Signal Descriptions 20 0 0 cee eeeeesecseceeeeeeeeeeaeecaecnseeeseeeeaeees 2 13 Analog Input Channels nes ne ea amet idees 2 13 Temperature Sensor Connection 2 15 Connector and Shell Assembly ss ts ae re 2 16 SCXI 1320 and SCXI 1328 Terminal Blocks 0 0 0 eee eeeeeeeeteeeeteeee 2 17 Terminal Block Temperature Sensor 2 18 Terminal Block Jumper Configuration 2 19 Terminal Block Signal Connection 2 20 Terminal Block Installation 0 0 0 0 eeecceeeseceeesececeseeeeseeeeeneeeenes 2 23 Rear Signal Connector ispisiri eee ie aa E EEE aeo En anis 2 23 Rear Signal Connector Signal Descriptions 2 25 Analog Output Signal Connections 2 26 National Instruments Corporation v SCXI 1120 User Manual Contents Digital I O Si
39. XI 1120 User Manual Configuration and Installation Chapter 2 Front Connector Figure 2 3 shows the pin assignments for the SCXI 1120 front connector Pin Signal Column Signal Number Name A B C Name 9 8 7 6 5 4 3 2 CHSGND jai Figure 2 3 SCXI 1120 Front Connector Pin Assignment SCXI 1120 User Manual 2 12 National Instruments Corporation 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 C4 MTEMP Multiplexed Temperature Sensor Connects the temperature sensor to the output multiplexer A6 C6 C8 RSVD Reserved Reserved for future use Do not connect any signals to these pins TTL CMOS output They are not protected A8 A10 C10 No Connect Do not connect any signals to these pins A16 C16 A22 C22 A28 C28 A12 A14 A18 CH7 through CHO Positive Input Channels The positive inputs to A26 A20 A24 channels 7 through 0 respectively A30 A32 C12 C14 C18 CH7 through CHO Negative Input Channels The negative inputs to C20 C24 C26
40. a ribbon cable to the MIO board 4 Connect the other end of the ribbon cable to the rear connector of the first SCXI 1350 SCXI 1120 User Manual E 10 National Instruments Corporation 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 Connect the cable assembly to the desired module in the second chassis or if you are using more than two chassis connect the loose end of the ribbon cable to the rear connector of the second SCXI 1350 and install the adapter board 9 Continue until all chassis are connected For N chassis you will need N ribbon cables and N multichassis adapters SCXI 1343 Rear Screw Terminal Adapter You use the SCXI 1343 universal adapter to adapt custom wiring to the SCXI 1120 The SCXI 1343 has screw terminals for the analog output connections and solder pads for the rest of the signals A strain relief clamp is on the outside of the rear panel SCXI 1343 Installation 1 Insert each wire through the adapter strain relief opening 2 Make all solder connections first 3 Connect the other wires to the screw terminals 4 Tighten the strain relief screws to secure the wires 5 Plug the adapter board fro
41. able with 2 m cable with 5 m cable with 10 m cable SCXI 1349 SCXI shielded cable assembly with 1 m cable with 2 m cable with 5 m cable with 10 m cable SCXI 1350 multichassis adapter SCXI process current resistor kit Standard ribbon cable 0 5 m 1 0 m NB6 cable 0 5 m 1 0m 776573 20 776573 28 776573 30 776574 40 776574 41 776574 42 776574 43 776574 44 776574 46 776574 471 776574 472 776574 475 776574 470 776574 491 776574 492 776574 495 776574 490 776575 50 776582 01 180524 05 180524 10 181305 01 181305 10 Refer to the Signal Connections section in Chapter 2 Configuration and Installation and to Appendix E SCX1 1120 Cabling for additional information on cabling connectors and adapters National Instruments Corporation 1 3 SCXI 1120 User Manual 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 e 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 Recommended manufacturer part numbers for this mating connector are as follows e Electronic Products Division 3M part number 3425 7650 e T amp B Ansley Cor
42. ar of the chassis 6 Connect the loose end of the ribbon cable to the PC LPM 16 I O connector Check the installation SCXI 1180 Feedthrough Panel The SCXI 1180 feedthrough panel provides front panel access to the signals of any data acquisition board that uses a 50 pin I O connector The SCXI 1180 consists of a front panel with a 50 pin male front panel connector that occupies one slot in the SCXI chassis and a ribbon cable with a female rear connector and a male breakout connector You can attach the rear connector to the male breakout connector of an SCXI 1340 SCXI 1341 SCXI 1342 SCXI 1344 or SCXI 1351 in the adjacent slot The breakout connector further extends the cabling scheme The front panel connector provides the feedthrough connection You can attach an SCXI 1302 terminal block to the front panel connector for simple screw terminal connections A rear filler panel that shields and protects the interior of the SCXI chassis is also included SCXI 1180 Installation Install the SCXI 1180 to the right of a slot that has an SCXI 1340 SCXI 1341 SCXI 1342 or SCXI 1344 cable assembly or an SCXI 1351 slot extender in its rear connector space Follow these steps to install the SCXI 1180 SCXI 1120 User Manual E 6 National Instruments Corporation 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 T
43. as 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 The procedure for this is as follows 1 2 3 4 5 6 7 Unscrew the rear grounding screw on the back of the terminal block as shown in Figure E 4 With a flathead screwdriver carefully pry the cover off the terminal block Insert each wire through the terminal block strain relief opening Connect the wires to the screw terminals Tighten the large strain relief screws to secure the wires Snap the cover back in place Reinsert the rear grounding screw The terminal block is now ready to be connected to the front panel connector SCXI 1120 User Manual E 8 National Instruments Corporation Appendix E SCXI 1120 Cabling 50 Pin Connector Grounding 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 SCX1 1180 Installation section 2 Wire the terminal block as previously described in the SCXI 1302 Wiring Procedure section 3 Connect the SCXI 1302 terminal block to the front panel connector on the SCXI 1180 feedthrough panel Be careful to fit the thumbscrews in the thumbscrew cutouts 4 Tigh
44. ation Appendix C SCXIbus Connector SCXIbus Connector Signal Descriptions Pin Al B1 Cl D1 A2 D2 A3 B3 C3 D3 A4 D4 A5 B5 C5 D5 A6 D6 B2 C2 C13 C17 A21 B21 C21 D21 C18 A19 B19 C19 D19 A20 B20 C20 D20 A22 B22 C22 D22 A23 D23 B23 C23 Signal Name GUARD ABO ABO CHSGND RSVD RESET MISO D A INTR V V 5 V SPICLK MOSI National Instruments Corporation Description Guard Shields and guards the analog bus lines from noise Analog Bus 0 Positive analog bus 0 line Used to multiplex several modules to one analog signal Analog Bus 0 Negative analog bus 0 line Used to multiplex several modules to one analog signal Chassis Ground Digital and analog ground reference Reserved Reset When pulled low reinitializes the module to its power up state Totem pole Input Master In Slave Out Transmits data from the module to the SCXIbus Open collector I O Data Address Indicates to the module whether address information or data information is being sent to the module on MOSI Open collector I O Interrupt Active low Causes data that is on MOSI to be written to the Slot Select Register Slot 0 Open collector Output Negative Analog Supply 18 5 V to 25 V Positive Analog Supply 18 5 V to 25 V 5 VDC Source Digital power supply Serial Peripheral Interface SPI
45. ation 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 Use the following formula to determine the overall gain of a given amplifier input channel Gtotal Gist X G2nd where Gtotal is the overall gain and Gj and G2na are the first and second stage gains Here it is important to note that the choice of gain in each stage will affect the amplifier bandwidth To determine the bandwidth of a given gain stage use the following formula BW GBWP G where BW is a given amplifier stage bandwidth GBWP is the gain bandwidth product typically 800 kHz and G is the gain at this stage This BW might be of concern at high first stage gains such as 50 and 100 In this case the first stage amplifier has a BW equal to 16 kHz and 8 kHz respectively Due to this decrease in the amplifier bandwidth you will notice a decrease in the channel overall bandwidth but a better noise immunity If this bandwidth limitation is unacceptable you should spread the gains over both stages thus increasing the BW of each amplifier stage This will introduce in most cases a negligible effect on
46. bWindows is on high density 5 25 in and 3 5 in diskettes You can use the SCXI 1120 together with the NB Series data acquisition boards with LabVIEW a software system that features interactive graphics a state of the art user interface and a powerful graphical programming language The LabVIEW Data Acquisition VI Library a series of VIs for using LabVIEW with National Instruments boards is included with LabVIEW The LabVIEW Data Acquisition VI Library is functionally equivalent to the NI DAQ software for Macintosh SCXI 1120 User Manual 1 2 National Instruments Corporation 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 Optional Equipment SCXI 1320 front terminal block SCXI 1328 high accuracy isothermal terminal block SCXI 1330 32 pin connector and shell assembly SCXI 1340 cable assembly SCXI 1341 Lab NB Lab PC Lab PC cable assembly SCXI 1342 PC LPM 16 cable assembly SCXI 1343 rear screw terminal adapter SCXI 1344 Lab LC cable assembly SCXI 1346 shielded multichassis cable adapter SCXI 1347 SCXI shielded cable assembly with 1 m c
47. be reset to the power up state When set this bit has no effect 2 LOAD Load This bit when clear forces a loading of the Slot 0 sample counter with the output of the FIFO When set this bit has no effect 1 SCANCONEN Scan Control Enable When set this bit enables the SCANCON lines When clear all SCANCON lines are disabled high 0 CLKEN Clock Enable When set this bit enables TRIGO as a clock for the hardscan circuitry When clear TRIGO is disabled National Instruments Corporation 4 7 SCXI 1120 User Manual Register Descriptions FIFO Register Chapter 4 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 The register will shift in the data present on the MOSI line bit 7 first when Slot 14 is selected by the Slot Select Register The Slot 0 scan list is created by consecutive writes to the FIFO Register Each write creates a new entry at the end of the scan list The maximum number of entries is 256 To clear the FIFO of all entries clear the HSRS bit in the HSCR Type Word Size Bit Map 15 Write only 16 bit 14 13 12 11 10 9 8
48. c types of scanning modes single module parallel scanning single module multiplexed scanning multiple module multiplexed scanning and multiple chassis scanning which is possible only with the SCXI 1001 chassis For additional information consult Chapter 2 Configuration and Installation Chapter 5 Programming your National Instruments Corporation 3 13 SCXI 1120 User Manual 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 Timing signals are not necessary for this type of scanning because the module provides all channels to the data acquisition board at all times You can implement single module parallel scanning with any data acquisition board that is appropriately cabled to the SCXI 1120 SCXI 1120 Data Acquisition Board Cable Assembly Analog Input 0 Analog Input 1 Eight Isolated Analog Input 2 Floating Analog Input 3 Single Ended Analog Input 4 Roue Analog Input 5 Analog Input 6 Analog Input 7 Figure 3 7 Single Module Parallel Scanning Multiplexed Scanning Only the MIO 16 data acquisition boards support multiplexed scanning on the SCXI 1120 During multiplex
49. cable assembly e SCXI 1344 Lab LC cable assembly e SCXI 1180 feedthrough panel e SCXI 1302 50 pin terminal block e SCXI 1351 one slot cable extender e SCXI 1350 multichassis adapter e SCXI 1343 screw terminal adapter SCXI 1340 Cable Assembly The SCXI 1340 cable assembly connects an MIO 16 board to an SCXI 1120 module The SCXI 1340 consists of a 50 conductor ribbon cable that has mounting bracket at one end and a 50 pin female connector at the other end The female connector connects to the I O connector of the MIO 16 board Attached to the mounting bracket is a 50 pin female mounting bracket connector that connects to the module rear signal connector To extend the signals of the MIO 16 board to an SCXI 1180 feedthrough panel or an SCXI 1181 breadboard module you can use the male breakout connector that is near the mounting bracket on the ribbon cable All 50 pins from the MIO 16 board go straight through to the rear signal connector You can use a standard 50 pin ribbon cable instead of the SCXI 1340 cable assembly The SCXI 1340 has the following advantages over the ribbon cable e The SCXI 1340 has strain relief so that you cannot accidentally disconnect the cable e The SCXI 1340 includes a mounting bracket that mounts to the chassis so that you can remove and reinsert the module without explicitly removing the cable from the back of the chassis This is especially useful when the SCXI chassis is rack mounted making rear access diff
50. ch 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 For more information consult Appendix E SCXI 1120 Cabling Table 2 9 SCXIbus to SCXI 1120 Rear Signal Connector to Data Acquisition Board Pin Equivalences SCXIbus Line SCXI 1120 MIO 16 Board Lab NB Lab PC PC LPM 16 Rear Signal Lab PC Lab LC Connector SERDATIN ADIOO DAQD A ADIOI SLOTOSEL ADIO2 SERCLK EXTSTROBE SERDATOUT BDIOO The digital timing signals are pins 36 and 43 e Pin 36 is used as a clock by the SCXI 1120 to increment the MUXCOUNTER after each conversion by the data acquisition board during scanning This signal is referred to as SCANCLK See Chapter 3 Theory of Operation for a description of MUXCOUNTER e Pin 43 is a reserved digital input The following specifications and ratings apply to the digital I O lines Absolute maximum voltage input rating 5 5 V with respect to DIG GND Digital input specifications referenced to DIG GND Va input logic high voltage 2 V minimum Vi input logic low voltage 0 8 V maximum I input current leakage 1 uA maximum Digital output specifications referenced to DIG GND Vox Output logic high voltage 3 7 V minimum at 4 mA maximum Voz output logic low voltage 0 4 V maximum at 4 mA maximum National Instruments Corporation 2 27 SCXI 1120 User Manual Configuration and Installation Chapter 2 Timing Requirements and Communication
51. combine the PC AT and MC data acquisition boards with the SCXI 1120 you can use LabVIEW for Windows or LabWindows for DOS LabVIEW and LabWindows are innovative program development software packages for data acquisition and control applications LabVIEW uses graphical programming whereas LabWindows enhances Microsoft C and QuickBASIC Both packages include extensive libraries for data acquisition instrument control data analysis and graphical data presentation Your National Instruments data acquisition board is shipped with the NI DAQ software NI DAQ has a library of functions that can be called from your application programming environment These functions include routines for analog input A D conversion buffered data acquisition high speed A D conversion analog output D A conversion waveform generation digital I O counter timer SCXI RTSI and self calibration NI DAQ maintains a consistent software interface among its different versions so you can switch between platforms with minimal modifications to your code You can also use the SCXI 1120 together with the PC AT and MC data acquisition boards with NI DAQ software for DOS Windows LabWindows NI DAQ software for DOS Windows LabWindows comes with language interfaces for Professional BASIC Turbo Pascal Turbo C Turbo C Borland C and Microsoft C for DOS and Visual Basic Turbo Pascal Microsoft C with SDK and Borland C for Windows NI DAQ software for DOS Windows La
52. counter is loaded with the first channel to be read During the scan the counter is clocked by SCANCLK from the data acquisition board or TRIGO from the SCXIbus depending on the state of the CLKSELECT bit in the Configuration Register During scanning operations the MUXCOUNTER is reloaded with the channel value stored in the Configuration Register when SCANCON is high inactive and will count upwards on each rising clock edge when SCANCON is low active In the Parallel Output mode the MUXCOUNTER is disabled and its output indicates binary 00 thus amplifier Channel 0 is selected at the output multiplexer and is connected to MCHO The seven other channels are hardwired to MCH1 through MCH7 on the rear signal connector The output multiplexer multiplexes all eight amplifier outputs and the temperature sensor reading provided on the MTEMP line To read the temperature sensor when it is multiplexed with the other input channels the RTEMP bit of the Configuration Register must be set high This measurement is only software controlled For hardware control of the temperature sensor reading connect the temperature sensor to pin 18 on the rear signal connector as described in Chapter 2 Configuration and Installation The multiplexer output connects to the MCHO and is connected to the data acquisition board analog channel input In the case of the MIO data acquisition boards MCHO on the rear signal connector corresponds to ACHO and ACH8 Furthermor
53. cquisition board National Instruments Corporation 5 3 SCXI 1120 User Manual 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 Remember to account for the gains of both the SCXI 1120 and the data acquisition board when calculating the actual voltage present at the input of the SCXI 1120 To measure one of the eight differential input channels to the SCXI 1120 perform the following steps 1 Write the binary pattern OOXXXXCC XX000000 to the SCXI 1120 Configuration Register 2 Measure the voltage with the data acquisition board To measure the voltage on the MTEMP line perform the following steps 1 Write the binary pattern 0OXXXXXX XX100000 to the SCXI 1120 Configuration Register 2 Measure the voltage with the data acquisition board Indirect Measurements Indirect measurements involve one module sending a signal to Analog Bus 0 where it is picked up by another module and transmitted to the data acquisition board Measurements from Other Modules To perform measurements from other modules you must cable the SCXI 1120 rear signal connector to a data acquisition board See Chapter 2 Configuration and I
54. criptions Pin Signal Name A2 CHSGND C2 DTEMP A4 5 V C4 MTEMP A6 C6 C8 RSVD A8 A10 C10 No Connect A16 C16 A22 C22 A28 C28 A12 A14 A18 CH7 through CHO A26 A20 A24 A30 A32 C12 C14 C18 CH7 through CHO C20 C24 C26 C30 C32 Description Chassis Ground Tied to the SCXI chassis 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 5 VDC Source Used to power the temperature sensor on the terminal block 0 2 mA of source not protected Multiplexed Temperature Sensor Connects the temperature sensor to the output multiplexer Reserved Reserved for future use Do not connect any signals to these pins TTL CMOS output They are not protected Do not connect any signals to these pins Positive Input Channels The positive inputs to channels 7 through 0 respectively Negative Input Channels The negative inputs to channels 7 through 0 respectively Further information is given in Chapter 2 Configuration and Installation SCXI 1120 User Manual D 2 National Instruments Corporation Appendix E SCXI 1120 Cabling This appendix describes how to use and install the hardware accessories for the SCXI 1120 e SCXI 1340 cable assembly e SCXI 1341 Lab NB Lab PC and Lab PC cable assembly e SCXI 1342 PC LPM 16
55. cts the necessary pullup resistor to the SERDATOUT line When using multiple chassis leave jumper W43 in position 1 on all of the SCXI 1120s that are cabled to the data acquisition board Only one of the SCXI 1120s that are cabled to the data acquisition board should have jumper W42 in position 1 It does not matter which of the SCXI 1120s that are cabled to the data acquisition board has the pullup connected All of the other SCXI 1120 modules that are cabled to the data acquisition board should have jumper W42 in position 3 The reason for this is that if too many pullup resistors are attached to the SERDATOUT line the drivers cannot drive the line low See Table 2 1 for the description and configuration of the jumper settings Table 2 1 Digital Signal Connections Jumper Settings W42 Connects pullup to SERDATOUT 3 Revision C and later factory default setting W42 Parking position not connected on Revision A and B W43 Connects MISO to SERDATOUT Factory default setting W43 Parking position SCXI 1120 User Manual 2 6 National Instruments Corporation continues Chapter 2 Configuration and Installation Table 2 1 Digital Signal Connections Jumper Settings Continued W45 Factory default Factory default Revision A and B modules only 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 refer
56. cular chassis Figure 2 13 illustrates the timing of this procedure with the example case of selecting Slot 11 in Chassis 9 Notice that the factory default chassis address for the SCXI 1000 is address 0 For information on changing the address of your chassis consult the SCXI 1000 1001 User Manual An SCXI 1000 chassis will respond to any chassis number SCXI 1120 User Manual 2 28 National Instruments Corporation Chapter 2 Configuration and Installation l l SLOTOSEL N SS X l Tss_dis l Chassis Y e i SS 11 I Telk_wait I gt Chassis 9 _ r l Tss_en SERCLK l TslotOsel _wait SERDATIN SXXXXXXXXXXXXXXXXXXX SXXXXXXZ I RRRRRRRRRRRRRRRRRRNNA 0 SSSR Chassis ID 9 Slot 11 Tss _ dis SLOTOSEL low to SS disabled 200 nsec maximum Tok _ wait SLOTOSEL low to first rising edge on SERCLK 75 nsec minimum Tslot0sel _ wait Last rising edge on SERCLK to SLOTOSEL high 250 nsec minimum Ts _ en SLOTOSEL high to SS enabled 350 nsec maximum Figure 2 13 Slot Select Timing Diagram To write the 16 bit slot select number to Slot 0 follow these steps 1 Initial conditions SERDATIN don t care DAQD A don t care SLOTOSEL 1 SERCLK 1 2 Clear SLOTOSEL to 0 This will deassert all SS lines to all modules in all chassis 3 For each bit starting with the MSB perform the following action a SERDATIN bit to be sent These bits are the data that are being written to the Sl
57. d Solder pad Solder pad Solder pad Solder pad Solder pad Appendix E National Instruments Corporation 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 SCXI 1120 Signal Conditioning Module National Instruments Corporation F 1 SCXI 1120 User Manual Revision and B Photo and Parts Locator Diagrams Appendix F Figure F 2 Revision A and B SCXI 1120 General Parts Locator Diagram SCXI 1120 User Manual F 2 National Instruments Corporation Appendix F Revision A and B Photo and Parts Locator Diagrams Figure F 3 Revision A and B SCXI 1120 Detailed Parts Locator Diagram National Instruments Corporation F 3 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 Support Form before contacting National Instruments helps us help you better and faster National Instruments provides comprehensive technical assistance around the wo
58. d Size 16 bit Bit Map 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 RTEMP RSVD SCANCLKEN SCANCONEN ABOEN FOUTEN Bit Name Description 15 CLKOUTEN Scan Clock Output Enable This bit determines whether the SCANCLK signal from the rear signal connector is sent out in inverted form to the TRIGO backplane signal If CLKOUTEN is set to 1 SCANCLK is transmitted on TRIGO If CLKOUTEN is cleared to 0 SCANCLK is not transmitted on TRIGO 14 CLKSELECT Scan Clock Select This bit determines whether the SCXI 1120 uses SCANCLK or the inverted form of TRIGO to clock the MUXCOUNTER for the purposes of scanning through the analog channels If CLKSELECT is cleared to 0 SCANCLK is used to clock MUXCOUNTER If CLKSELECT is set to 1 TRIGO is used as the source to clock MUXCOUNTER 13 11 7 6 X Don t care bits Unused 10 8 CHAN lt 2 0 gt Channel Select These bits determine the channel number zero to seven that is loaded into the MUXCOUNTER to determine the analog channel to be read during a single read or the starting channel on the module for a scanned data acquisition CHAN is the MSB National Instruments Corporation 4 3 SCXI 1120 User Manual Register Descriptions Bit Name 5 RTEMP 4 RSVD 3 SCANCLKEN 2 SCANCONEN 1 ABOEN 0 FOUTEN SCXI 1120 User Manual Chapter 4 Description continued Read Temperature This bit determines whether the selected channel output or the MTEMP signal is driven onto
59. d for NRSE or RSE 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 Tables 2 4 and 2 5 show how to set up the gain for each channel Table 2 4 Gain Jumper Allocation Input Channel Number First Gain Jumper Second Gain Jumper 0 WI w9 The board is shipped with the first stage gain set to 100 position A and a second stage gain set to 10 position D To change the gain of your module move the appropriate jumper on your module to the position indicated in Tables 2 3 and 2 4 Refer to Figure 2 1 SCXI 1120 General Parts Locator Diagram and Figure 2 2 Detailed Parts Locator Diagram for jumper locations on your module To determine the overall gain of a given channel use the following formula Overall gain First stage gain x second stage gain National Instruments Corporation 2 9 SCXI 1120 User Manual Configuration and Installation Chapter 2 Table 2 5 Gain Jumper Positions First stage Second stage D Factory setting E 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 Two stage filtering eliminates the noise generated by the isolation amplifier producing a higher signal to noise ratio Furthermore two
60. d 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 2 27 digital interface circuitry 3 6 digital signal connections 2 4 to 2 7 jumper settings table 2 6 to 2 7 jumper W42 2 5 jumper W43 2 5 jumper W44 2 5 using jumpers W42 and W43 2 5 to 2 6 direct temperature connection jumper W41 2 8 to 2 9 documentation conventions used xii organization of manual xi xii related documentation xiii DTEMP signal 2 13 D 2 E equipment optional 1 3 to 1 4 F fax technical support G 1 FIFO Register 4 8 filter jumpers 2 10 floating AC coupled signal connection 2 14 floating signal connection referenced to chassis ground 2 14 FOUTEN bit 4 4 front connector analog input channels 2 13 to 2 15 AC coupled signal connection 2 15 floating AC coupled signal connection 2 14 floating signal connection 2 14 ground referenced signal connection 2 14 pin assignments 2 12 D 1 SCXI 1120 User Manual Index 3 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
61. dicate to the module whether the incoming serial stream is data or address information 29 SLOTOSEL Slot 0 Select Taps into the SCXIbus INTR line to indicate whether the information on MOST is being sent to a module or Slot 0 36 SCANCLK Scan Clock Indicates to the SCXI 1120 that a sample has been taken by the data acquisition board and causes the SCXI 1120 to change channels 37 SERCLK Serial Clock This signal taps into the SCXIbus SPICLK line to clock the data on the MOSI and MISO lines 43 RSVD Reserved All other pins are not connected SCXI 1120 User Manual B 2 National Instruments Corporation 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 National Instruments Corporation B 3 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 National Instruments Corporation C 1 SCXI 1120 User Manual SCXIbus Connector Appendix C CHSGND CHSGND CHSGND CHSGND 5 V 5 V SPICLK MOSI TRIGO SS SCANCON Figure C 1 SCXIbus Connector Pin Assignment SCXI 1120 User Manual C 2 National Instruments Corpor
62. dule 1 10 11 12 Refer to Figure 2 8 Assembling and Mounting the SCXI 1330 Connector and Shell Assembly and the diagram included with your SCXI 1330 kit to build the connector and shell assembly Turn off the computer that contains your data acquisition board or disconnect the board from your SCXI chassis Turn off your SCXI chassis Slide the selected module out of the SCXI chassis Remove the module cover Place one jack screw as indicated in Figure 2 8 While holding the jack screw in place insert the lock washer and then the nut Notice that you might need long nose pliers to insert the washer and nut Tighten the nut by holding it firmly and rotating the jack screw Repeat steps 6 through 8 for the second jack screw Replace the module cover and tighten the grounding screw Slide the module back in place Connect the SCXI 1330 to your module connector and secure it by tightening both mounting screws SCXI 1120 User Manual 2 16 National Instruments Corporation Chapter 2 Configuration and Installation Shell Assembly Mounting Screw 8 SCXI 1120 Module B Washers 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 One terminal block
63. dule or Slot 0 programming only programming the data acquisition board is necessary National Instruments Corporation 5 5 SCXI 1120 User Manual 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 You should follow the instructions in the following sections e AT MIO 16 User Manual Multiple A D Conversions with Continuous Channel Scanning Round Robin Multiple A D Conversions with Interval Channel Scanning Pseudosimultaneous e AT MIO 16D User Manual Multiple A D Conversions with Continuous Channel Scanning Round Robin Multiple A D Conversions with Interval Channel Scanning Pseudosimultaneous e AT MIO 16F 5 User Manual Posttrigger Data Acquisition with Continuous Channel Scanning Posttrigger Data Acquisition with Interval Channel Scanning e AT MIO 16X User Manual Continuous Channel Scanning Data Acquisition Interval Channel Scanning Data Acquisition e AT MIO 64F 5 User Manual Continuous Channel Scanning Data Acquisition Interval Channel Scanning Data Acquisition e Lab LC User Manual Programming Multiple A D Conversions with Channel Scanning e Lab NB User Manual Programming Multiple A D Conversions with Channel Scanning e Lab PC User Manual Programming Multiple A D Conversions with Channel Scanning e Lab PC User Manual Programming Multiple A D Conversions with Channel Scanning
64. e C18 RSVD Reserved A19 RESET Reset When pulled low reinitializes the module to its power up state Totem pole Input B19 MISO Master In Slave Out Transmits data from the module to the SCXIbus Open collector I O C19 D A Data Address Indicates to the module whether address information or data information is being sent to the module on MOSI Open collector I O D19 INTR Interrupt Active low Causes data that is on MOSI to be written to the Slot Select Register Slot 0 Open collector Output A20 B20 C20 V Negative Analog Supply 18 5 V to 25 V D20 A22 B22 C22 V Positive Analog Supply 18 5 V to 25 V D22 A23 D23 5 V 5 VDC Source Digital power supply B23 SPICLK Serial Peripheral Interface SPI Clock Clocks the serial data on the MOSI and MISO lines Open collector I O C23 MOSI Master Out Slave In Transmits data from the SCXIbus to the module Open collector I O SCXI 1120 User Manual 3 4 National Instruments Corporation Chapter 3 Theory of Operation Pin Signal Name Description continued A24 TRIGO TRIGO 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 operation
65. e the multiplexed output of the SCXI 1120 can be bused via switches to ABO on the SCXIbus to other modules When you use multiple modules it is possible to bus the module output via ABO to the module that connects to the data acquisition board In this case the ABO switches of all the modules are closed whereas the output multiplexer of all the modules except the one being read are disabled Refer to chapters 2 and 5 for further details on how to configure and program multiple modules In addition to the Multiplexed Output mode described in the previous paragraph it is possible to operate the SCXI 1120 in the Parallel Output mode In this mode you need no software other than the software used with your data acquisition board to control the scanning of the eight channels or to perform a single read To access the temperature sensor in this mode configure the temperature sensor in the DTS mode At power up or reset amplifier Channel 0 is selected on the output multiplexer and thus connects to MCHO The other seven amplifier channels are hardwired to the rear signal connector Notice that when the Multiplexed Output mode is selected pins 5 through 18 on the rear signal connector are still driven by the SCXI 1120 The SCXI 1120 outputs on the rear signal connector are short circuit protected Refer to the following Scanning Modes section for further details on how to scan the SCXI 1120 channels Scanning Modes The SCXI 1120 has four basi
66. e 3 12 SCXI 1120 Rear Signal Connector Pin Equivalences sesseeeeeeeeeeeeeeeeerere 5 2 SCXI 1120 and MIO 16 Board Pinout Equivalences 0 0 eeceeeseeeesseeeesteeeenes E 2 SCXI 1341 and SCXI 1344 Pin Translations E 4 SCXI 1342 Pin Translations i2 0 s edtiasiisie dead iene hati deinen E 5 SCXI 1343 Pil COMME CU ONS LES Su AR eiai en ts nues E 12 SCXI 1120 User Manual x National Instruments Corporation 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 The SCXI 1120 is a member of the National Instruments Signal Conditioning eXtensions for Instrumentation SCXI Series for the National Instruments data acquisition plug in boards This board is designed for low cost signal conditioning of thermocouples volt sources millivolt sources and 4 to 20 mA sources or 0 to 20 mA process current sources where high common mode voltages exist This manual describes the installation theory of operation and basic programming considerations for the SCXI 1120 Organization of This Man
67. econd method of operation is especially useful when the data acquisition board scan list length is limited to 16 entries as it is on all MIO boards except the AT MIO 16F 5 which can have up to 512 entries Because you can multiplex many SCXI 1120s in one chassis to one MIO board channel often the simplest way to program the MIO board is to use only one data acquisition board scan list entry and make N the total number of samples to be taken on all modules in one scan Check your MIO board user manual for limitations in the data acquisition board scan list format To program the MIO board to take N samples per data acquisition board scan list entry perform the following additional programming steps at the end of the Enable the Scanning Data Acquisition Operation section in the appropriate data acquisition board user manual 1 Write FFOI to the Am9513 Command Register to select Counter 1 Mode Register 2 Write 0325 hex to the Am9513 Data Register to store Counter 1 Mode Value for most MIO boards For the AT MIO 16F 5 and the AT MIO 16X and the AT MIO 64F 5 write 1325 hex 3 Write FFO9 to the Am9513 Command Register to select Counter 1 Load Register 4 Write the number of samples to be taken per scan list entry 2 to 65 535 to the Am9513 Data Register to load Counter 1 5 Write FF41 to the Am9513 Command Register to load Counter 1 6 Write FFF1 to the Am9513 Command Register to step Counter 1 7 Write FF21 to the Am9513 Command Re
68. ected automatically When no communications are taking place between the data acquisition board and any modules write zero to the Slot Select Register to ensure that no accidental writes occur 5 If you are writing to a Configuration Register clear DAQD A to 0 this indicates data will be written to Configuration Register If you are writing to the HSCR or FIFO Register leave DAQD A high 6 For each bit to be written to the Configuration Register a Establish desired SERDATIN level corresponding to this bit b Clear SERCLK to 0 c Set SERCLK to 1 clock the data If you are using an MIO 16 board writing to the EXTSTROBE register will pulse EXTSTROBE low and then high accomplishing steps 6b and 6c SCXI 1120 User Manual 5 2 National Instruments Corporation Chapter 5 Programming 7 Pull SLOTOSEL 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 Ifyou are not selecting another slot write zero to the Slot 0 Slot Select Register If you are selecting another slot start at step 3 For a timing illustration of a Configuration Register write see Figure 2 15 Configuration Register Write Timing Diagram which shows the proper write to configure an SCXI 1120 that is directly cabled to an MIO 16 board for multiple module multiplexed scanning with a start channel of 3 Initialization The SCXI 112
69. ed scanning a module sends the SCANCLK signal to Slot 0 over the TRIGO backplane line and Slot 0 sends SCANCON signals to each module Each module uses its SCANCON signal to reload MUXCOUNTER and to determine when the SCXI 1120 output is enabled Slot 0 contains a module scan list first in first out FIFO memory chip similar to the Channel Gain FIFO on an MIO 16 board except that instead of having a channel number and gain setting for each entry the Slot 0 FIFO contains a slot number and a sample count for each entry The list in Slot 0 will determine which module is being accessed and for how many samples It is important that you make sure that the lists on the data acquisition board and Slot 0 are compatible so that the samples are acquired as intended See your SCXI chassis manual for more information Single Module Multiplexed Scanning Single Module Multiplexed Scanning Direct This is the simplest multiplexed scanning mode Directly cable the SCXI 1120 to the data acquisition board as shown in Figure 3 8 The module sends SCANCLK onto TRIGO and Slot 0 sends SCANCON back to the module SCANCON will be low at all times during the scan SCXI 1120 User Manual 3 14 National Instruments Corporation 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 pu
70. ence designator number changes When you learn how to configure one channel you can configure the other channels as well Grounding Shielding and Reference Mode Selection Jumper W46 Position B ROR1 is the parked position and the factory default setting Position AB RO connects the analog reference to the analog output ground pins 1 and 2 on the rear signal connector Select this configuration when using an RSE data acquisition board You should not use differential input data acquisition boards when jumper W46 is in the AB RO position Position AB R1 connects the analog reference to the SCXIbus guard Position AB R2 enables the Pseudodifferential Reference mode and connects the analog reference to the OUTREF pin on the rear signal connector Select this mode when the SCXI 1120 has to operate with data acquisition boards that have a nonreferenced single ended input NRSE Do not use differential input data acquisition boards when jumper W46 is in the AB R2 position Note The SCXI 1120 will drive pins 4 6 8 10 12 14 16 and 18 on the rear signal connector although the SCXI 1120 is in pseudodifferential mode National Instruments Corporation 2 7 SCXI 1120 User Manual Configuration and Installation Chapter 2 Table 2 2 Jumper W46 Settings W46 Factory setting in parking position Connects the analog reference to AOGND pins 1 and 2 of the rear signal connector Use this connection with RSE data acquisition boards
71. ences E 5 to E 6 SCXI 1343 rear screw terminal adapter installation E 11 pin connections E 12 SCXI 1344 cable assembly E 3 to E 4 installation E 4 to E 5 pin equivalences E 4 SCXI 1120 User Manual Index 7 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 and write procedure 5 2 to 5 3 SERDATIN signal communicating on SPI bus 2 28 to 2 31 digital I O signal connections 2 26 to 2 27 rear signal connector 2 25 B 2 register selection and write procedure 5 2 to 5 3 SERDATOUT 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 2 6 rear signal connector 2 25 B 2 serial data timing diagram 2 30 Serial Peripheral Interface SPI bus communication signals See communication signals for SPI bus shielding jumper W46 2 7 signal connections front connector analog input channels 2 13 to 2 15 pin assignments 2 12 D 1 SCXI 1320 terminal block 2 17 to 2 21 2 23 SCXI 1328 terminal block 2 17
72. ents believes that the information in this manual is accurate The document has been carefully reviewed for technical accuracy In the event that technical or typographical errors exist National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition The reader should consult National Instruments if errors are suspected In no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NATIONAL INSTRUMENTS MAKES NO WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CUSTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA PROFITS USE OF PRODUCTS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty prov
73. es for the SCXI 1120 front connector including a description of each connection e Appendix E SCXI 1120 Cabling describes how to use and install the hardware accessories for the SCXI 1120 e 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 e Appendix G Customer Communication contains forms you can use to request help from National Instruments or to comment on our products and manuals e The Glossary contains an alphabetical list and description of terms used in this manual including abbreviations acronyms metric prefixes mnemonics symbols and terms e The Index contains an alphabetical list of key terms and topics in this manual including the page where you can find each one Conventions Used in This Manual The following conventions are used in this manual italic Lab board MC MIO board monospace NB PC SCXIbus SCXI 1120 User Manual Italic text denotes emphasis a cross reference or an introduction to a key concept Lab board refers to the Lab LC Lab NB Lab PC and Lab PC boards unless otherwise noted MC refers to the Micro Channel series computers MIO board refers to the AT MIO 16 AT MIO 16D AT MIO 16F 5 AT MIO 16X AT MIO 64F 5 MC MIO 16 NB MIO 16 and NB MIO 16X series of multichannel I O data acquisition boards Lowercase text in
74. f modules cabled to the data National Instruments Corporation 2 5 SCXI 1120 User Manual 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 In a multichassis ribbon cable system with Revision A and B SCXI 1120s cabled to the data acquisition board you can access the MISO line in only one chassis Pick one of the chassis that has the SCXI 1120 cabled to the DAQ board Set jumper W43 on the SCXI 1120 to position 1 On the SCXI 1120s that are in the other chassis and cabled to the data acquisition board set jumper W43 to position 3 Notice that you will only be able to access digital information from the chassis that has the SCXI 1120 with jumper W43 set to position 1 On Revision C and later modules the SERDATOUT line is driven with an open collector driver a driver that actively drives low or goes to a high impedance state relying on a pullup resistor to make the signal line go high When using a single chassis leave W42 and W43 in position 1 the factory default on the SCXI 1120 that is connected to the data acquisition board In this setting the module drives MISO to SERDATOUT and conne
75. filter bandwidths are available 10 kHz and 4 Hz Table 2 6 Filter Jumper Allocation Input Channel First Filter Jumper Second Filter Jumper Number 4Hz 10 kHz 4 Hz 10 kHz Factory Factory Setting Setting 0 1 2 3 4 5 6 7 Your SCXI 1120 is shipped in the 4 Hz position Remember to make sure that both stages are set to the same bandwidth to ensure that the required bandwidth is achieved Notice that one jumper block is available for each filter stage SCXI 1120 User Manual 2 10 National Instruments Corporation 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 Turn off the computer that contains the data acquisition board or disconnect it from your SCXI chassis 2 Turn off the SCXI chassis Do not insert the SCXI 1120 into a chassis that is turned on 3 Insert the SCXI 1120 into the module guides Gently guide the module into the back of the slot until the connectors make good contact If a cable assembly has already been installed in the rear of the chassis the module and cable assembly
76. gister of the SCXI 1120 in Slot 3 Notice that after Channel 7 the SCXI 1120 will wrap around to Channel 0 Follow the steps given 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 Oo oO oO oO a Write 0 samples 00 00000100 to the FIFO Register This corresponds to Slot 1 for five b Write 00000001 10000110 to the FIFO Register This corresponds to Slot 4 for seven samples rn oO O oO oO O O c Write 00000 samples 100 to the FIFO Register This corresponds to Slot 3 for five Make sure to toggle SLOTOSEL or reselect the FIFO Register from scratch between steps 6a 6b and 6c National Instruments Corporation 5 13 SCXI 1120 User Manual 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 Assuming that the modules are correctly cabled and programmed the Slot 0 scan lists should be as follows Entry Slot Count Entry Slot Count Entry Slot Count Number Number N
77. gister to arm Counter 1 8 Set the SCANDIV bit in Command Register 1 2 Module Programming This section describes the programming steps for various scanning possibilities Single Module Parallel Scanning To perform single module parallel scanning you must cable the SCXI 1120 rear signal connector to a data acquisition board with each output connected to a different data acquisition board channel See Chapter 2 Configuration and Installation for more information To program the SCXI 1120 for single module parallel scanning write the binary pattern OOXXXX00 XX000000 to the SCXI 1120 Configuration Register Notice that this can be the RESET state SCXI 1120 User Manual 5 8 National Instruments Corporation 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 Single Module Multiplexed Scanning Indirect To indirectly scan a module send the output of the scanned module onto Analog Bus 0 where it is picked up by another module and transmitted to the data acquisition board Channel Scanning from Other Modules To scan measurements from other modules you must
78. gnal Connections ss 2 26 Timing Requirements and Communication Protocol 2 28 Timing Signal wsicdsvsededavanescaces Iescaes ne eiie dosdaarasestde tones 2 28 Communication Signals shirts ni anna 2 28 Chapter 3 Theory of Operation un nt cart ch aaah aay am Se te dt 3 1 F ctonal OyervieW scars reece hcg SAR vtec ee On nt AR MN ie ee in 3 1 SCX bus Connector ssanie ap siine asii aeiaai esias 3 2 SCXIbus Connector Signal Descriptions 3 4 Digital Interface esse a aa A EA EE AES O E S SS 3 6 Digital Control Creu ry seene e ea ee ea a a iiS 3 7 Analog and Timing Circuitry sesssessssssessesssssesssesssssrtssesserseesseessrsessissossnessesseesessess 3 8 Analog Input CRAN ns Rene a r A a 3 8 CABANE SR dan n nn E EEE ES T a 3 10 Calibration Equipment Requirements ssssseeseeeseseeeeesersseseresressereresresss 3 10 Offs t Null Adjust ssl nra e e g nette 3 11 Analog Output Circuitry sogs cceacissesdecaswnseide ce eekeadvetsadessevens luacsanesabawcransns 3 12 DONNE MOSS Send ce a A ns te ed 3 13 Single Module Parallel Scanning 3 14 Multiplexed Scanning setce nd tt ne ni E E e ete Sie ane 3 14 Single Module Multiplexed Scanning eeecceeeseceesseceeeeeeeeeteeeeaees 3 14 Single Module Multiplexed Scanning Direct 3 14 Single Module Multiplexed Scanning Indirect 0 ee 3 15 Multiple Module Multiplexed Scanning 3 15 Muluple Chassis SCAN nai eMail 3 16 Chapter 4 Register Descriptions 0e uen A Norte nee 4 1 Re
79. gure 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 kQ to 1 MQ This solution although necessary in this case lowers the input impedance of the input channel amplifier and introduces an additional offset voltage proportional to the input bias current and to the resistor value used The typical input bias current of the amplifier consists of 80 pA and a negligible offset drift current When a 100 KQ resistor is used this will result into 8 uV of offset which is insignificant in most applications However if larger valued bias resistors are used significant input offset may result To determine the maximum offset introduced by the biasing resistor use the following equation V ofsbias Ibias X Rbias The input signal range of an SCXI 1120 input channel is 5 V Gta referenced to its negative input where Giotal is equal to the product of the first stage and second stage gains In addition the input channels are overvoltage protected to 240 Vrms with power on or off at a maximum of 4 5 mArms sink or source Warning Exceeding the input signal range and the common mode input range results in distorted signals Exceeding the maximum input voltage rating 250 Vrms between terminals and between a
80. h C C Celsius CH Positive Input Channel Number signal CH Negative Input Channel Number signal CHAN Channel Select bit CHS Chassis bit CHSGND Chassis Ground signal CJR cold junction reference CLKEN Clock Enable bit CLKOUTEN Scan Clock Output Enable bit CLKSELECT Scan Clock Select bit CNT Count bit National Instruments Corporation Glossary 1 SCXI 1120 User Manual Glossary D D A D A DAQD A dB DIG GND DIN DMM DTEMP DTS F F FIFO FOUTEN FRT G GBWP GUARD hex HSCR HSRS Hz l in INTR LOAD LSB SCXI 1120 User Manual 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 Fahrenheit first in first out Forced Output Enable bit Forced Retransmit bit gain bandwidth product Guard signal hexadecimal Hardscan Control Register Hardscan Reset bit hertz input current leakage inches Interrupt signal input output kelvin Load bit least significant bit Glossary 2 National Instruments Corporation MCH MCH MIO MISO MOD MOSI MSB MTEMP MTS NRSE O ONCE OUTREF P ppm RAM RESET rms RSE RSVD RTD RTEMP RTSI S SCANCLK SCANCLKEN SCANCON SCANCONEN SCXI SDK National Instruments Corporation Glossary meters megabytes of memory Positive Analog O
81. his complies with UL 1244 and protects against electric shock when the terminal block is not connected to the chassis To connect the safety earth ground to the strain relief tab run an earth ground wire in the cable from the signal source to the terminal block National Instruments is not liable for any damages or injuries resulting from inadequate safety earth ground connections Shock Hazard This unit should only be opened by qualified personnel aware of A the dangers involved Disconnect all power before removing cover Always install grounding screw To connect the signal to the terminal block use the following procedure 1 2 OO Et OY CO Remove the grounding screw of the top cover Snap out the top cover of the shield by placing a screwdriver in the groove at the bottom of the terminal block Slide the signal wires one at a time through the front panel strain relief opening You can add insulation or padding if necessary Connect the wires to the screw terminals by wrapping the wires around the screws and tightening the screws without letting the wires slip out Tighten the larger strain relief screws Snap the top cover back in place Reinsert the grounding screw to ensure proper shielding Connect the terminal block to the SCXI 1120 front connector as explained in the Terminal Block Installation section later in this chapter Figure 2 9 shows a parts locator diagram for the SCXI 1320 terminal block Figure 2 10 sho
82. hread 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 Threaded Strip in Rear of Chassis SCXI 1180 Breakout Connector N O O O N AAAA ANNAAS LOCCCCOCC CEC ECCCC CE CC CELECCC CCC CS AN Breakout Connector from SCXI 1340 v A A J J y J J J J y J J J J J y J J J J J J J J J y y J J J J J 7 a Rear Connector Ribbon Cable to Front Panel Figure E 2 SCXI 1180 Rear Connections 4 Screw in the rear panel to the threaded strip in the rear of the chassis 5 Screw the front panel into the front threaded strip as shown in Figure E 3 Check the installation National Instruments Corporation E 7 SCXI 1120 User Manual SCXI 1120 Cabling Appendix E 000000200000 DOOOOOO 7 RA Front Panel Connector gt Ribbon Cable to Rear and Breakout Connectors KI DOOOGOO Ho 10000600 P Step 5 Front Panel Be ee C4 Front Threaded Strip SNANSNNNNNNNNNNNNNSNNNNNN SNNNNNNNNNNNNNNNNNNNNNN ANNSNNNNNNNNNNNNNNNNNNN SNNSNNNNNNNNNNNNNNNNNNN Figure E 3 SCXI 1180 Front Panel Installation SCXI 1302 50 Pin Terminal Block The SCXI 1302 terminal block h
83. icult e The SCXI 1340 has an extra male breakout connector for use with the SCXI 1180 feedthrough panel or additional modules or breadboards that need a direct connection to the MIO 16 board e The SCXI 1340 rear panel gives the module and the chassis both mechanical and electrical shielding National Instruments Corporation E 1 SCXI 1120 User Manual SCXI 1120 Cabling Appendix E 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 SCXI 1120 Rear Signal Connector MIO 16 Board Equivalent AOGND AIGND MCHO ACHO MCHO0 ACH8 MCH1 ACHI MCH1 ACH9 MCH2 ACH2 MCH2 ACH10 MCH3 ACH3 MCH3 ACHI1 MCH4 ACH4 MCH4 ACH12 MCH5 ACHS MCHS ACH13 MCH6 ACH6 MCH6 ACH14 MCH7 ACH7 MCH7 ACHIS OUTREF DIG GND SERDATIN SERDATOUT DAQD A SLOTOSEL SCANCLK SERCLK RSVD AISENSE DIG GND ADIOO BDIOO ADIOI ADIO2 SCANCLK EXTSTROBE OUTI No other pins are connected on the SCXI 1120 SCXI 1340 Installation Follow these steps to install the SCXI 1340 1 Make sure that the computer and the SCXI chassis are turned off 2 Install the SCXI module in the chassis 3 Plug the mounting bracket connector onto the module rear signal connector see Figure E 1 Make sure the alignment tab on the bracket enters the upper module guide of the chassis 4 Screw the mounting bracket to the threaded strips in the rear of the chassis SCXI 1
84. ided herein does not cover damages defects malfunctions or service failures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control Copyright Under the copyright laws this publication may not be reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation Trademarks LabVIEW NI DAQ and RTSI are trademarks of National Instruments Corporation Product and company names listed are trademarks or trade names of their respective companies Warning Regarding Medical and Clinical Use of National Instruments Products National Instruments products are not designed with components and testing intended to ensure a level of reliability suitable for use in treatment and diagnosis of humans Applications of National Instruments products involving medical or clinical treatment can create a potential for accidental injury caused by product failure or by errors on the part of the user or application designer Any use or application of National Instruments products for or involving medical or clinical treatmen
85. ies resulting from inadequate safety earth ground connections When connecting your signals to the SCXI 1320 terminal block for use with the SCXI 1120 follow the labeling on the SCXI 1320 indicated under the module type column for the SCXI 1120 as indicated in Figure 2 9 When connecting your signals to the SCXI 1328 high accuracy isothermal terminal block for use with the SCXI 1120 follow the labeling on the SCXI 1328 indicated along the module type row for the SCXI 1120 as indicated in Figure 2 10 Terminal Block Temperature Sensor To accommodate thermocouples with the SCXI 1120 the terminal block has a temperature sensor for cold junction compensation You can connect the temperature sensor in two ways e You can connect the temperature sensor to the MTEMP pin C4 on the module front connector and multiplex the sensor at the output multiplexer along with amplifier outputs This is the Multiplexed Temperature Sensor MTS mode Refer to the Configuration Register section in Chapter 4 Register Descriptions for further details e You can connect the temperature sensor to a separate data acquisition channel via pin 18 on the module rear signal connector when you set SCXI 1120 jumper W41 to position 3 This is the Direct Temperature Sensor DTS mode Note Use an average of a large number of samples to obtain the most accurate reading Noisy environments require more samples for greater accuracy The SCXI 1320 temperature sensor output
86. iguration and Installation Jumper W44 On Revision A and B modules position 1 connects after buffering SLOTOSEL 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 See Appendix E SCX 1120 Cabling for the pin equivalences of the SCXI 1120 rear signal connector and the data acquisition board I O connector Position 3 is reserved and should not be used On Revision C and later modules jumper W44 is not loaded SLOTOSEL is always buffered to the INTR line Jumper W43 Position 1 connects after buffering the SCXIbus MISO line to the SERDATOUT pin of the rear signal connector In this setting along with the proper setting of jumper W42 the data acquisition board can read the Module ID Register of the SCXI 1120 This is the factory default setting See the Timing Requirements and Communication Protocol section later in this chapter and Chapter 4 Register Descriptions for information on reading the Module ID Register See Appendix E SCXI 1120 Cabling for the pin equivalences of the SCXI 1120 rear signal connector and the data acquisition board I O connector Position 3 disconnects SERDATOUT from the SCXIbus MISO line Jumper W42 On Revision A and B modules ju
87. indirect 3 15 5 9 MUXCOUNTER 3 13 3 14 3 15 5 11 SCXI 1120 User Manual 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 P parallel scanning single module 3 14 5 8 PC LPM 16 cable assembly See SCXI 1342 physical specifications A 3 pin assignments front connector 2 12 D 1 rear signal connector 2 24 B 1 SCXI 1343 rear screw terminal adapter E 12 SCXIbus connector 3 3 C 2 pin equivalences SCXI 1120 and MIO 16 board pinout equivalences E 2 SCXI 1341 E 4 SCXI 1342 E 5 to E 6 SCXI 1344 E 4 SCXIbus to rear signal connector 3 5 SCXIbus to rear signal connector and data acquisition boards 2 27 5 2 programming See also registers notation for bit patterns 5 1 register writes 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 scanning examples 5 12 to 5 15 scanning measurements 5 5 to 5 12 SCXI 1120 User Manual Index 5 Index 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
88. ingle module parallel scanning 3 14 SCXI 1120 See also configuration installation block diagram 3 1 contents of kit 1 2 custom cables 1 4 definition of xi 1 1 optional equipment 1 3 to 1 4 optional software 1 2 to 1 3 overview 1 1 Revision A and B signal conditioning module detailed parts locator diagram F 3 general parts locator diagram F 2 photograph F 1 unpacking 1 4 SCXI 1120 registers 4 1 to 4 4 Index 6 SCXI 1120 User Manual 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 procedure E 8 to E 9 SCXI 1320 terminal block definition of 2 17 installation 2 23 jumper configuration 2 19 parts locator diagram 2 21 signal connection 2 20 temperature sensor 2 18 warnings 2 18 SCXI 1328 terminal block definition of 2 17 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 warnings 2 18 SCXI 1330 connector and shell assembly 2 16 to 2 17 SCXI 1340 cable assembly E 1 to E 2 installation E 2 to E 3 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 pin equivalences E 4 SCXI 1342 cable assembly E 5 installation E 6 pin equival
89. ious Multiple Module Multiplexed Scanning section and program the thirteenth and fourteenth modules according to Channel Scanning from the SCXI 1120 via Another Module earlier in this chapter 3 Programming the Slot 0 Hardscan Circuitry The following section describes how to program the Slot 0 circuitry for scanning operations For a more detailed description of the Slot 0 scanning circuitry consult the SCX 1000 1001 User Manual Descriptions of the Slot 0 registers are in the Slot 0 Register Descriptions section of Chapter 4 Register Descriptions It is not necessary to read this section if you are performing single module parallel scanning SCXI 1120 User Manual 5 10 National Instruments Corporation Chapter 5 Programming To program the hardscan circuitry perform the following steps 1 Write binary 0000 0000 to the HSCR Write binary 0000 1000 to the HSCR Write the Slot 0 scan list to the FIFO Write binary 101S 1100 to the HSCR 2 3 4 Write binary 0010 1100 to the HSCR 5 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 Write binary 0000 1000 to the HSCR Write binary 0100 1000 to the HSCR Write binary 0000 1000 to the HSCR Write binary 101S 1100 to the HSCR 2 3 4 Write binary 0010 1100 to the HSCR
90. l Connector Signal Descriptions B 2 Appendix C SCXIDUS Connector jaic 25 5 ae aarin aan aca ae MeO C 1 SCXIbus Connector Signal Descriptions C 3 Appendix D SCXI 1120 Front Connector run Que dti oaks D 1 Front Connector Signal Descriptions issu asatnnesitansh eh ainnendiitnettie D 2 National Instruments Corporation vii SCXI 1120 User Manual Contents Appendix E SCXI 1120 Cabling Sn nd ne nn se den E 1 SCXI 1340 Cable ASS MER nn En Sn sent aS E 1 SEMI TFA Install AO id nr E a EEE sees E 2 SCXI 1341 Lab NB Lab PC or Lab PC and SCXI 1344 Lab LC Cable Assembly menti emaltaies E 3 SCXI 1341 and SCXI 1344 Installation 0 eee eee cescecsseceseeeeeeseeeeeseeeeaees E 4 SCXI 1342 PC LPM 16 Cable Assembly ss E 5 SCXI 1342 Installation se dau on nie initie E 6 SCXI 1180 Feedthrough Panel ssh seseen diese E 6 SEXIELISO Installation eeni renneri gad eaten tatan otccsasndacedeise aE E 6 SCXI 1302 50 Pin Terminal Block nn sn ee ae at anes E 8 SEXI 1502 Wirins Procedure nn E ee ae E 8 SCXEIT302Tnstallation Se RS M E 9 SCXI 1351 One Slot Cable ERNEST ns ses E 9 DCA Ded aol Installations ena Ne Ne NN E 10 SCXI 1350 Multichassis Adapter ya SR nn init E 10 DC Mle 1350 MATOS RM Re ne EIE ER ne E 10 SCXI 1343 Rear Screw Terminal Adapter ss E 11 SEXL1343 Installation lens nes note ee ns nn ie E 11 Appendix F Revision A and B Photo and Parts Locator Diagrams F 1 Appendix G Customer Communication G 1 GOSSA Yearn
91. le the scanning data acquisition operation Apply a trigger Service the data acquisition operation e Lab PC User Manual Lab PC User Manual and PC LPM 16 User Manual Start and service the data acquisition operation e Lab LC User Manual Program the sample interval counter Service the data acquisition operation e Lab NB User Manual Program the sample interval counter Counter AO Service the data acquisition operation Scanning Examples The following examples are intended to aid your understanding of module and Slot 0 programming It will be helpful to refer to the bit descriptions for the Configuration Register and the FIFO Register in Chapter 4 Register Descriptions Example 1 You want to scan in Multiplexed mode channels 1 through 4 on an SCXI 1120 in Slot 1 of an SCXI 1000 chassis The SCXI 1120 is directly cabled to a data acquisition board The programming steps are as follows 1 Program your data acquisition board as described in the Data Acquisition Board Setup Programming section of this chapter 2 Following the procedure given in the Register Writes section write 10000100 00001101 to the Configuration Register of the SCXI 1120 in Slot 1 SCXI 1120 User Manual 5 12 National Instruments Corporation 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 con
92. mper W42 should not be connected On Revision C and later modules position 1 connects a 2 2 KQ pullup resistor to the SERDATOUT line Position 3 does not connect the pullup resistor to the SERDATOUT line Using Jumpers W42 and W43 If the SCXI 1120 is not cabled to a data acquisition board the positions of these jumpers do not matter so leave them in their factory default positions both in position 1 If the SCXI 1120 is cabled to a data acquisition board and the SCXI chassis that the SCXI 1120 is in is the only SCXI chassis cabled to that data acquisition board leave the jumpers in their factory default positions both in position 1 If the SCXI 1120 is cabled to a data acquisition board and there are multiple SCXI chassis cabled to that data acquisition board with shielded cables you are using SCXI 1346 shielded cable multichassis adapters leave the jumpers in their factory default positions both in position 1 If the SCXI 1120 is cabled to a data acquisition board and there are multiple SCXI chassis cabled to that data acquisition board with ribbon cables you are using SCXI 1350 multichassis adapters leave jumper W43 in its factory default position position 1 On all but one of the SCXI 1120s that are cabled to the data acquisition board move jumper W42 to position 3 It does not matter which of the SCXI 1120 modules that are cabled to the data acquisition board has jumper W42 set to position 1 If you have different types o
93. 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 circuitry 5 10 to 5 11 single channel measurements 5 3 to 5 5 direct measurements 5 3 to 5 4 indirect measurements 5 4 to 5 5 measurements from other modules 5 4 measurements from SCXI 1120 via another module 5 4 to 5 5 multiplexed output 5 4 parallel output 5 3 Pseudodifferential Reference mode 2 7 R RD bit 4 7 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 SCXIbus pin equivalences 3 5 signal descriptions 2 25 to 2 26 B 2 timing signal 2 28 National Instruments Corporation Index 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 3 7 4 3 to 4 4 Module ID Register 2 31 3 8 4 2 Slot 0 registers 4 5 to 4 8 FIFO Register 4 8 Hardscan Control Register HSCR 4 7 Slot Select Register 4 6 RESET signal description of 3 4 C 3 initialization 5 3 and
94. must be firmly engaged however do not force the module into place 4 Screw the front mounting panel of the SCXI 1120 to the top and bottom threaded strips of your SCXI chassis 5 If this module is to be connected to an MIO 16 data acquisition board attach the connector at the metal end of the SCXI 1340 cable assembly to the rear signal connector on the SCXI 1120 module Screw the rear panel to the rear threaded strip Attach the loose end of the cable to the MIO 16 board Note For installation procedures with other SCXI accessories and data acquisition boards consult Appendix E SCX1 1120 Cabling 6 Check the installation 7 Turn on the SCXI chassis 8 Turn on the computer or reconnect it to your chassis The SCXI 1120 board is installed and ready for operation Signal Connections This section describes the input and output signal connections to the SCXI 1120 board via the SCXI 1120 front connector and rear signal connector and includes specifications and connection instructions for the signals given on the SCXI 1120 connectors Warning Connections that exceed any of the maximum ratings of input or output signals on the SCXI 1120 can result in damage to the SCXI 1120 board and to the SCXIbus Maximum input ratings for each signal are given in this chapter under the discussion of that signal National Instruments is not liable for any damages resulting from such signal connections National Instruments Corporation 2 11 SC
95. nel output or MTEMP unless SCANCON is active low and the SCANCONEN bit is cleared If the selected channel output or MTEMP is driving the output buffer it will drive Analog Bus 0 if ABOEN is set If nothing is driving the output buffer the SCXI 1120 output will saturate 4 4 National Instruments Corporation 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 SLOTOSEL 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 The Hardscan Control Register HSCR is an 8 bit write only register used for setting up the timing circuitry in Slot 0 The Slot Select Register is written to by using the SLOTOSEL line The HSCR and the FIFO Register are written to as if they were registers located on modules in Slots 13 and 14 You should maintain software copies of the Slot Select Register HSCRs and all the Slot 0 scan lists that correspond to the writes to FIFO Registers If you are using multiple chassis it is important to understand the architectural differences of the Slot Select Register as compared to the HSCR and the FIFO Register Although each chassis has its o
96. nstallation for more information To make a measurement from another module perform the following steps 1 Perform any necessary programming to ensure that no modules are driving Analog Bus 0 For an SCXI 1120 clearing ABOEN in the Configuration Register will ensure that its output is not driving ABO 2 Write the binary pattern OOXXXXXX XX100011 to the SCXI 1120 Configuration Register This step disables the SCXI 1120 from driving Analog Bus 0 and allows Analog Bus 0 to drive MCHO through the output buffer 3 Program the other module to drive Analog Bus 0 with the signal to be measured 4 Measure the voltage with the data acquisition board Measurements from the SCXI 1120 via Another Module To perform measurements via another module you must cable the other module rear signal connector to a data acquisition board The other module must be able to transfer Analog Bus 0 to the data acquisition board See Chapter 2 Configuration and Installation for more information SCXI 1120 User Manual 5 4 National Instruments Corporation 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 ABOEN in the Configuration Register will ensure that its output is not driving ABO 2 Program the other module not to drive Analog Bus 0 but to send Analog Bus 0
97. nt connector to the module rear signal connector Make sure a corner of the adapter board enters the upper module guide of the chassis 6 Screw the rear panel to the threaded strips in the rear of the chassis National Instruments Corporation E 11 SCXI 1120 User Manual SCXI 1120 Cabling SCXI 1120 User Manual D AU D AOGND AOGND MCHO MCHO MCH1 MCH1 MCH2 MCH2 MCH3 MCH3 MCH4 MCH4 MCH5 MCHS MCH6 MCH6 MCH7 MCH7 OUTREF No Connect No Connect No Connect No Connect DIG GND SERDATOUT DAQD A No Connect SLOTOSEL No Connect No Connect No Connect No Connect No Connect SCANCLK SERCLK No Connect No Connect No Connect No Connect No Connect RSVD No Connect No Connect No Connect No Connect No Connect No Connect No Connect Table E 4 SCXI 1343 Pin Connections Rear Signal Connector Pin SCXI 1120 Use Connection Type Solder pad Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pad Solder pa
98. nts or any other sign of damage Notify National Instruments if the module appears damaged in any way Do not install a damaged module into your SCXI chassis SCXI 1120 User Manual 1 4 National Instruments Corporation 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 National Instruments Corporation 2 1 SCXI 1120 User Manual Configuration and Installation Chapter 2 Figure 2 1 SCXI 1120 General Parts Locator Diagram SCXI 1120 User Manual 2 2 National Instruments Corporation Chapter 2 Configuration and Installation Figure 2 2 shows a detailed parts locator diagram of the SCXI 1120 Figure 2 2 Detailed Parts Locator Diagram National Instruments Corporation 2 3 SCXI 1120 User Manual Configuration and Installation Chapter 2 The jumpers are used as follows e 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 SLOTOSEL 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 la
99. nu ANS ne ANS DR our que alta Glossary 1 ARR D a D nl Index 1 SCXI 1120 User Manual vill National Instruments Corporation Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 Figure 2 8 Figure 2 09 Figure 2 10 Figure 2 11 Figure 2 12 Figure 2 13 Figure 2 14 Figure 2 15 Figure 2 16 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure 3 09 Figure 3 10 Figure 3 11 Figure B 1 Figure C 1 Figure D 1 Figure E 1 Figure E 2 Figure E 3 Figure E 4 Figure F 1 Figure F 2 Figure F 3 National Instruments Corporation ix Contents Figures SCXI 1120 General Parts Locator Diagram 0 eee eeeceeeseceeeeeceeeteeeesteeeeaees 2 2 Detailed Parts Locator Diagramme Ne 2 3 SCXI 1120 Front Connector Pin Assignment ceecceeesececeteceeeteeeesteeeenaees 2 12 Ground Referenced Signal Connection with High Common Mode Voltage 2 14 Floating Signal Connection Referenced to Chassis Ground for Better Signal to Nois RAO isis sictssssecaasacs seecisnsdeessesdaaeacaesdecs sasecedanesedartaasbaceavssecavncens 2 14 Floating AC Coupled Signal Connection ss 2 14 AC Coupled Signal Connection with High Common Mode Voltage 2 15 Assembling and Mounting the SCXI 1330 Connector and Shell Assembly 2 17 SCXI 1320 Parts Locator Diagram 3 i61sssieccdeccsacssdsiiccvenscceeasessanselascaced stsca
100. nveeens 2 21 SEXI 1328 Parts Locator Diaerann iscs 5s ssasensasevstheszenasoensateghastaresscedanteeadeieedes 2 22 SCXI 1120 Rear Signal Connector Pin Assignment 2 24 SCANCLE Timing Requirements trust initie Annie 2 28 Sloteselect Timing Diag tan ess inst nd a ceausneaeieccaens 2 29 Serial Data Time Diagramme ne Ne wee 2 30 Configuration Register Write Timing Diagram cece eeeeeeeeeereeeneeenteeeeees 2 31 SCXI 1120 Module ID Register Timing Diagram eee eee eeeeeeseeeeeeeeneees 2 31 SCXI 1120 Block Diagram ca issccisssidesiecysnsiadeasecdentscashea cents cetanseadettaadactaseseaanaers 3 1 SCXIbus Connector Pin Assignment ceccceecceceeceeseececeneeeceeeeeeseeeeeseeeeaees 3 3 Digital Interface Circuitry Block Diagram 0 ee eee eeseeeeceeeeeereeeneecnteeeeeeeeneees 3 6 SEXL1120 Digital Control innesi Rs RAA e ee ne 3 7 Analog Input Block Diagram eee eeescecsseceesseceenscceesscceescceesscesessceeseeeesues 3 9 Analoe Output Cire Urey nid ne ie ni min einen reris 3 12 Single Module Parallel Scanning 3 14 Single Module Multiplexed Scanning Direct 3 15 Single Module Multiplexed Scanning Indirect eee eeeeeseceeeeeeeeeneeeeaeenes 3 15 Multiple Module Multiplexed Scanning 3 16 Muluple Chassis Scanning 2 Giese needle Real 3 16 SCXI 1120 Rear Signal Connector Pin Assignment cceeecceesseeeeeteeeeneees B 1 SCXIbus Connector Pin Assignment ss C 2 SCX
101. ny terminal and ground can result in damage to the SCXI 1120 the SCXIbus and the data acquisition board National Instruments is not liable for any damages resulting from such signal connections Temperature Sensor Connection Pins C2 and C4 are dedicated for connecting the temperature sensor to the SCXI 1120 The temperature sensor is not isolated and is referenced to the chassis ground The connection is overvoltage protected to 25 VDC with power on and 15 VDC with power off Warning Exceeding the overvoltage protection on the temperature connections can result in damage to the SCXI 1120 the SCXIbus and the data acquisition board National Instruments is not liable for any damages resulting from such signal connections National Instruments Corporation 2 15 SCXI 1120 User Manual 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 After you have built the cable the shell covers and protects the connector Perform the following steps to assemble and mount the connector and shell assembly to your SCXI mo
102. oftware copy to determine the status of the register To change the state of a single bit without disturbing the remaining bits set or clear the bit in the software copy and write the software copy to the register National Instruments Corporation 5 1 SCXI 1120 User Manual Programming Chapter 5 Table 5 1 SCXI 1120 Rear Signal Connector Pin Equivalences SCXIbus Line SCXI 1120 Rear MIO 16 Board Lab NB Lab PC PC LPM 16 Signal Connector Lab PC Lab LC SERDATIN ADIOO DAQD A ADIOI SLOTOSEL ADIO2 SERCLK EXTSTROBE SERDATOUT BDIOO 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 SLOTOSEL 1 SERCLK 1 2 Clear SLOTOSEL to 0 This will deassert all SS lines to all modules in all chassis 3 For each bit starting with the MSB bit 15 a SERDATIN bit to be sent These bits are the data that is being written to the Slot Select Register b Clear SERCLK to 0 c Set SERCLK to 1 This rising edge clocks the data If you are using an MIO 16 board writing to the EXTSTROBE register will pulse EXTSTROBE low and then high accomplishing steps 3b and 3c 4 Set SLOTOSEL to 1 This will assert the SS line of the module whose slot number was written to Slot 0 If you are using multiple chassis only the appropriate slot in the chassis whose address corresponds to the written chassis number will be sel
103. on SCXI 1350 Multichassis Adapter You use the SCXI 1350 multichassis adapter to connect an additional SCXI 1001 chassis to the MIO 16 board Using several SCXI 1350s you can connect up to eight chassis to a single MIO board The SCXI 1350 consists of a multichassis adapter board You will also need a ribbon cable for each chassis to chassis connection and a ribbon cable for the connection from the MIO board to the first chassis Note Use 0 5 m ribbon cable when connecting multiple chassis together to minimize cable length and maintain signal integrity You can use a m cable from the MIO board to the first chassis The adapter board has a male rear connector a female front connector and a male chassis extender connector You can attach the rear connector to a ribbon cable from the MIO board or a preceding chassis You connect the front connector with the module rear signal connector You connect the chassis extender connector to a ribbon cable that goes to the subsequent chassis The adapter takes Channel 0 from the front connector and sends it to Channel 0 of the rear connector The adapter also takes channels 0 through 6 on the chassis extender connector and maps them to channels through 7 respectively on the rear connector SCXI 1350 Installation Follow these steps to install the SCXI 1350 1 Make sure that the computer and all the SCXI chassis are turned off 2 Insert all the modules in all the chassis 3 Connect one end of
104. on boards that are configured for referenced single ended RSE measurements jumper W46 should be in position AB RO to connect the SCXI 1120 analog ground reference to the data acquisition analog ground Pin 19 is the OUTREF pin and is connected internally to the analog reference when jumper W46 is in position AB R2 Pins 3 through 18 are the analog output channels of the SCXI 1120 Pins 3 and 4 or MCHO are a multiplexed output of all eight channels and the temperature sensor output Pins 5 through 18 or MCH1 through MCH74 are a parallel connection of channels 1 through 7 to the rear signal connector Pin 18 is a direct connection to the temperature sensor when jumper W41 is in position 3 Notice that the temperature sensor is located on the terminal block For further details on configuring the temperature sensor output refer to the SCX1 1320 and SCXI 1328 Terminal Blocks section earlier in this chapter Warning The SCXI 1120 analog outputs are not overvoltage protected Applying external voltage to these outputs can result in damage to the SCXI 1120 National Instruments is not liable for any damages resulting from such signal connections Note The SCXI 1120 analog outputs are short circuit protected Digital I O Signal Connections Pins 24 through 27 29 33 36 37 and 43 constitute the digital I O lines of the rear signal connector They are divided into three categories the digital input signals the digital output signals and the
105. onto TRIGO 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 SCANCON B Data Acquisition Board Cable Assembly Analog Bus 0 Figure 3 10 Multiple Module Multiplexed Scanning Multiple Chassis Scanning In this mode you attach each SCXI 1001 chassis to a daisy chain of cable assemblies and multichassis adapter boards as shown in Figure 3 11 You program each chassis separately and each chassis occupies a dedicated channel of the data acquisition board Within each chassis scanning operations act as if the other chassis are not being used with one exception you must program the Slot 0 scan list in each chassis with dummy entries of Slot 13 to fill the samples when the data acquisition board will be sampling another chassis or data acquisition board channel This will keep the chassis synchronized Notice that you can only perform multiple chassis scanning with the SCXI 1001 chassis and MIO 16 data acquisition boards See Chapter 5 Programming for more information on multiple chassis scanning See Appendix E SCXI 1120 Cabling for more information on the necessary cable accessories for multichassis scanning Data Acquisition Board Cable Multichassis Multichassis Multichassis Adapter Adapter Adapter Assembly Cable Cable Input Ch N Assemblies Input Ch 1 Input Ch 0 Timing O
106. ot Select Register b SERCLK 0 c SERCLK 1 This rising edge clocks the data 4 Set SLOTOSEL to 1 This will assert the SS line of the module whose slot number was written to Slot 0 If multiple chassis are being used only the appropriate slot in the chassis whose address corresponds to the written chassis number will be selected When no communication is taking place between the data acquisition board and any modules you should write zero to the Slot Select Register to ensure that no accidental writes occur Figure 2 14 shows the timing requirements on the SERCLK and SERDATIN signals You must observe these timing requirements for all communications Tdelay is a specification of the SCXI 1120 National Instruments Corporation 2 29 SCXI 1120 User Manual Configuration and Installation Chapter 2 Thigh RS a l Tsetup I Thold SERDATIN NOIRS RO 05 05 05 05 Le et 9055 55 55050505 PRR RR RAR RR RRP RRR RRRRRA T delay SERDATOUT a gt 4 Tse Minimum low time 65 nsec minimum Thigh Minimum high time 400 nsec minimum setup SERDATIN setup time 200 nsec minimum Thold SERDATIN hold time 200 nsec minimum T elay SERDATOUT delay 350 nsec maximum Figure 2 14 Serial Data Timing Diagram After the Slot Select line to an SCXI 1120 has been asserted you can write to its Configuration Register and read from its Module ID Register using the following protocols The contents of the Module ID Register are reinitiali
107. poration part number 609 5041CE Standard 50 conductor 28 AWG stranded ribbon cables that can be used with these connectors are as follows e Electronic Products Division 3M part number 3365 50 e T amp B Ansley Corporation part number 171 50 The SCXI 1120 front connector is a 32 pin DIN C male connector with columns A and C even pins only The manufacturer part number used by National Instruments for this connector is as follows e Panduit Corporation part number 100 932 023 The mating connector for the SCXI 1120 front connector is a 32 pin DIN C female connector National Instruments uses a polarized connector to prevent inadvertent upside down connection to the SCXI 1120 Recommended manufacturer part numbers for this mating connector are as follows e Panduit Corporation part number 100 932 434 straight solder eyelet pins e Panduit Corporation part number 100 932 633 right angle pins These connectors were selected to meet UL 1950 and UL 1244 for 1 500 Vrms isolation Unpacking Your SCXI 1120 module is shipped in an antistatic package to prevent electrostatic damage to the module Several components on the module can be damaged by electrostatic discharge To avoid such damage in handling the module take the following precautions e Touch the antistatic package to a metal part of your SCXI chassis before removing the module from the package e Remove the module from the package and inspect the module for loose compone
108. put Channel WIT A W25 0N W2 0FF SSCS C wisa WT ON WA OR LMD A W29 0N W30 0FF SOS WOW ONE OR SS C wara wa ON WHO wor SSCS woor O o W22 A W35 ON W36 OFF W23 A W37 ON W38 OFF W24 A W39 ON W40 OFF e Other Modules in System e Data Acquisition Boards Installed 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 Name Title Company Address Phone Mail to Technical Publications Fax to Technical Publications National Instruments Corporation National Instruments Corporation 6504 Bridge Point Parkway MS 53 02 MS 53 02 Austin TX 78730 5039 512 794 5678 Glossary Numbers Symbols degrees Q ohms 5 V signal 5 VDC Source signal A A amperes ABO Positive Analog Bus 0 signal ABO Negative Analog Bus 0 signal ABOEN Analog Bus 0 Enable bit ACH data acquisition board Analog Input Channel Number A D analog to digital AOGND Analog Output Ground signal Arms amperes root mean square AWG American Wire Gauge B BW bandwidt
109. r This is the factory setting The DTEMP position connects the temperature sensor to SCXI 1120 jumper W41 In both MTS and DTS modes the reference to the temperature sensor signal is the SCXI 1120 analog ground that is connected to MCHO in the MTS mode or to OUTREF or AOGND with SCXI 1120 jumper W46 set in positions AB R2 and AB RO respectively in the DTS mode One jumper block comprises both positions thus you can use only one type of configuration at a time The parking position for the jumper block is the MTEMP position the temperature sensor is disabled until the RTEMP bit in the Configuration Register selects the sensor Tables 2 7 and 2 8 show the jumper settings on the SCXI 1320 and SCXI 1328 terminal blocks Table 2 7 Jumper Settings on the SCXI 1320 Terminal Block MTS mode selected factory setting parking position DTS mode selected National Instruments Corporation 2 19 SCXI 1120 User Manual Configuration and Installation Chapter 2 Table 2 8 Jumper Settings on the SCXI 1328 Terminal Block MTS mode selected factory setting parking position DTS mode selected 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 If high voltages 242 Vrms are present you must connect the safety earth ground to the strain relief tab T
110. r modules to be used in the scan to connect their outputs to Analog Bus 0 but not drive Analog Bus 0 unless receiving an active low signal on SCANCON Also program the modules to use TRIGO as their clock source For SCXI 1120 modules this programming is accomplished by writing the binary pattern 01XXXCCC XX001111 to their Configuration Registers Multiple Chassis Scanning To scan modules on multiple chassis you must use the SCXI 1001 chassis The cable from the data acquisition board must bus the digital lines to one module on each chassis Additionally the cable must provide each chassis with its own analog channel The data acquisition board must be able to take several readings at a time on a given channel before accessing a new channel See the Counter 1 and SCANDIV subsection of the 7 Data Acquisition Board Setup Programming section earlier in this chapter You can use the MIO 16 boards in conjunction with the SCXI 1350 multichassis adapter for multichassis scanning For each chassis program the modules according to the appropriate mode of operation disregarding the fact that other chassis will be involved For example you want to scan thirteen modules Twelve modules are in one chassis and the thirteenth is in the second chassis and is to be scanned through a fourteenth module that is cabled to the data acquisition board but is not involved in the scan Program the twelve modules in the first chassis according to the steps in the prev
111. rear signal connector pinout at the front connector of the SCXI 1341 or SCXI 1344 The adapter board also has an additional male breakout connector that makes the unmodified Lab board signals accessible to an SCXI 1180 feedthrough panel or an SCXI 1181 breadboard module The adapter board gives the National Instruments Corporation E 3 SCXI 1120 User Manual 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 SCXI 1341 and SCXI 1344 Pin Translations Lab Board Pin Lab Board Signal SCXI 1120 Pin SCXI 1120 Signal ACHO MCHO ACHI MCH1 ACH2 MCH2 ACH3 MCH3 ACH4 MCH4 ACHS5 MCHS5 ACH6 MCH6 ACH7 MCH7 AIGND AOGND DACOOUT No Connect AOGND No Connect DACIOUT No Connect DGND DIG GND PB4 SERDATIN PB5 DAQD A PB6 SLOTOSEL PB7 SERCLK PCI SERDATOUT PC2 No Connect EXTCONV SCANCLK OUTB1 No Connect 5 V No Connect All other pins of the Lab board pinout are not sent to the SCXI 1120 rear signal connector SCXI 1341 and SCXI 1344 Installation Follow these steps to install the SCXI 1341 or SCXI 1344 1 Make sure that the computer and the SCXI chassis are t
112. rial in parallel out shift register Data is received on the MOSI line from either Slot 0 or the data acquisition board when SS is enabled and D A indicates data transfer D A low The Configuration Register provides channel selection and configures the SCXI 1120 for scanning options All the control bits are fed into a latch before being routed to the rest of the module The channel select bits are taken directly from the shift register Complete descriptions of the register bits are given in Chapter 4 Register Descriptions Writes to the Configuration Register require the following steps 1 SS goes low enabling communication with the board D A goes low indicating that the information sent on the MOSI line is data The serial data is available on MOSI and SPICLK clocks it into the register PT ee SS goes high and D A goes high indicating an end of communication This action latches the Configuration Register bits When the SCXIbus is reset all bits in the Configuration Register are cleared National Instruments Corporation 3 7 SCXI 1120 User Manual 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
113. rld In the U S and Canada applications engineers are available Monday through Friday from 8 00 a m to 6 00 p m central time In other countries contact the nearest branch office You may fax questions to us at any time Corporate Headquarters 512 795 8248 Technical support fax 800 328 2203 512 794 5678 Branch Offices Phone Number Australia 03 879 9422 Austria 0662 435986 Belgium 02 757 00 20 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 00 Germany 089 741 31 30 Italy 02 48301892 Japan 03 3788 1921 Netherlands 03480 33466 Norway 32 848400 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 20 51 51 U K 0635 523545 National Instruments Corporation G 1 Fax Number 03 879 9179 0662 437010 19 02 757 03 11 45 7671 11 90 502 2930 1 48 14 24 14 089 714 60 35 02 48301915 03 3788 1923 03480 30673 32 848600 91 640 0533 08 730 43 70 056 20 51 55 0635 523154 SCXI 1120 User Manual 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 If you are using any National Instruments hardware or software products related to this problem include the configuration forms f
114. rom their user manuals Include additional pages if necessary Name Company Address Fax ___ Phone ___ Computer brand Model Processor Operating system Speed MHz RAM MB Display adapter Mouse yes no Other adapters installed Hard disk capacity MB Brand Instruments used National Instruments hardware product model Revision Configuration National Instruments software product Version Configuration The problem is List any error messages The following steps will reproduce the problem 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 SCXI 1120 Revision Letter e Chassis Slot e Chassis Type e Grounding Shielding and Reference Mode Selection Factory Setting Parked W46 B ROR1 e Input Channel Gain Configuration Input Channel First Stage Gain Second Stage Gain User Sering Cow O AC owon SSCS owsa S own i SS AC owo SS BC wi owa sd CHR ni WA aa 7 100 W8 A 10 W15 D 100 W5 A 10 W13 D 10 W16 D e Input Channel Filter Configuration In
115. s Totem pole Input All other pins are not connected MOSI MISO SPICLK and SS form a synchronous communication link that conforms with SPI using an idle high clock and second edge data latching D A INTR and RESET are additional control signals When the module is being used in an SCXI 1000 or SCXI 1001 chassis the data acquisition board via the module rear signal connector must tap into the open collector backplane signal lines as a master to write to the module The signal connections from the rear signal connector to the backplane are shown in Table 3 1 Table 3 1 SCXIbus Equivalents for the Rear Signal Connector Rear Signal Connector SCXIbus Equivalent Signal SERDATIN MOSI DAQD A D A SLOTOSEL INTR Jumper W44 must be set to position 1 Revision A and B modules only SERCLK SPICLK SERDATOUT MISO Jumper 43 must be set to position 1 The SCXI 1120 module converts the data acquisition board signals to open collector signals on the backplane of the SCXI chassis In order for the data acquisition board to talk to a slot the board must first assert the SS for that slot This is done by asserting INTR low writing a 16 bit number over MOSI corresponding to the desired slot and chassis if an SCXI 1001 chassis is being used and then releasing INTR high At this point the SS of the desired slot is asserted low and the data acquisition board can communicate with the module in that slot according to the SPI pro
116. s 10 mV C and has an accuracy of 1 C over the 0 to 55 C temperature range To determine the temperature use the following formulas T C 100 V tEmpout T C 9 13 T CF 5 2 where Vtgmpout is the temperature sensor output and T F and T C are the temperature readings in degrees Fahrenheit and degrees Celsius respectively The SCXI 1328 temperature sensor outputs 0 62 to 0 07 V from 0 to 55 C and has an accuracy of 0 35 C over the 15 to 35 C range and 0 65 C over the 0 to 15 and 35 to 55 C ranges SCXI 1120 User Manual 2 18 National Instruments Corporation Chapter 2 Configuration and Installation To determine the temperature use the following formulas T C T Tx 273 15 where Tx is the temperature in kelvin 1 Tk 3 a b InRr c InRr a 1 288 x 10 3 b 2 356 x 104 c 9 556 x 10 8 Rr resistance of the thermistor in Q Ry 50 oo V TEMPOUT 2 5 V TEMPOUT VTEMPOUT Output voltage of the temperature sensor T lt a ave where T F and T C are the temperature readings in degrees Fahrenheit and degrees Celsius respectively T F Terminal Block Jumper Configuration In addition to the screw terminals the terminal block has one jumper for configuring the onboard temperature sensor When you set jumper W1 on the terminal block to the MTEMP position the jumper connects the temperature sensor to the SCXI 1120 output multiplexe
117. s after calibration with antisabotage lacquer to avoid tampering with the calibration Table 3 2 lists the potentiometer reference designators that correspond to each channel National Instruments Corporation 3 11 SCXI 1120 User Manual Theory of Operation Chapter 3 Table 3 2 Calibration Potentiometers Reference Designators Input Channel Amplifier Channel Number Input Null Output Null Analog Output Circuitry Figure 3 6 shows the SCXI 1120 analog output circuitry Ch 10 j anne Output e Mux pa Channel 7 MCHO ABO Output Switch Stage Control MTEMP From MCHI Channel 1 px MCHI1 Output Stage and pe oan From MCH6 ontro Channel 6 MCH6 S Q d S Q 3 20 n a d e4 Analog Reference From MCH7 Channel 7 W41 DTEMP gt gt o m Figure 3 6 Analog Output Circuitry SCXI 1120 User Manual 3 12 National Instruments Corporation 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 MCHO In the Single Channel Read mode the MUXCOUNTER is loaded with the desired channel number In the Scanning mode the
118. sister Descption eis sienen o i ete A A eee ed ee 4 1 Register Description Form t snien ea aa aie ig ai aiaa a 4 1 SC XT TZORESISIETS iii inaa aie a A r et on a 4 1 Mod le ID REGIS ET acini n a rt ne 4 2 Configuration Register niis iieen i eo eee ae ee 4 3 Slot O Register Descriptions ics fist ni fans Rea EE nia cies 4 5 SIOL Select Resister din RE Pai een an teeta ae 4 6 Hardscan Control Register HSCR ss 4 7 FIFO R vister nissan luodenceneasansvansdaccaamaden ts lesdudeanastde lone 4 8 Chapter 5 Prosrammint oa a es 5 1 Programming Considerations cch csccscnciseceaita cehssseaaccuas secede siuecedsassscaties at ecaueeseacunaceneiavat 5 1 PND GEL ON Le Le ae te ao A eee 5 1 R SISTER RS Re SR ee 5 1 Register Selection and Write Procedure 0 eee eeeeeeesseceseeeeeeeeneeenaeeees 5 2 RICA eA OND xt 26e net a tn ee ens oe nat nature 5 3 SCXI 1120 User Manual vi National Instruments Corporation Contents Single Channel Measurements ss 5 3 Direct Measurements sssrinin Delia Rire 5 3 Parallel Output due dcaca pgasdasvensecetasnadanes doadansasentdetones 5 3 Multiplexed Ou tp t tarsi aioe Rites lee A nee 5 4 Indirect Measurements seed ann eco eile aed 5 4 Measurements from Other Modules cescceeesseeesseeeeeteeeeees 5 4 Measurements from the SCXI 1120 via Another Module 5 4 Se annie Measurements siensia been Sandee nig eee ate Be 5 5 1 Data Acquisition Board Setup Programming 5 6 Counter 1 and SCAND
119. sists 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 Example 2 An SCXI 1000 chassis has four SCXI 1120 modules in Slots 1 2 3 and 4 The SCXI 1120 in Slot 4 is cabled to the data acquisition board You want to scan channels 3 through 7 on the SCXI 1120 in Slot 1 channels 0 through 6 on the SCXI 1120 in Slot 4 and channels 7 through 3 on the SCXI 1120 in Slot 3 The programming steps are as follows 1 Program your data acquisition board as described in the Data Acquisition Board Setup Programming section Following the procedure given in the Register Writes section write 00000000 00000000 to the Configuration Register of the SCXI 1120 in Slot 2 This step resets the module including the clearing of the ABOEN bit bit 0 Notice that a complete reset of this module is not necessary but is used for simplicity Following the procedure given in the Register Writes section write 1OXXX000 00001111 to the Configuration Register of the SCXI 1120 in Slot 4 Following the procedure given in the Register Writes section write O1XXX011 00001111 to the Configuration Register of the SCXI 1120 in Slot 1 Following the procedure given in the Register Writes section write O1XXX111 00001 to the Configuration Re
120. struments Corporation register selection and write procedure 5 2 to 5 3 slot select timing diagram 2 29 writing 16 bit slot select number 2 29 SLOTOSEL 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 rear signal connector 2 25 B 2 register selection and write procedure 5 2 to 5 3 software optional 1 2 to 1 3 specifications analog input A 1 to A 2 cold junction sensor A 2 to A 3 operating environment A 3 physical A 3 storage environment A 3 SPI bus See communication signals for SPI bus SPICLK signal description of 3 4 C 3 digital control circuitry 3 7 and SPI bus 3 5 SS signal description of 3 5 C 4 digital control circuitry 3 7 3 8 programming Slot 0 hardscan circuitry 5 11 storage environment specifications A 3 T technical support G 1 temperature connection direct jumper W41 2 8 to 2 9 temperature sensor connection for analog input channels 2 15 SCXI 1320 terminal block 2 18 SCXI 1328 terminal block 2 18 to 2 19 terminal block See SCXI 1302 50 pin terminal block SCXI 1320 terminal block SCXI 1328 terminal block theory of operation SCXI 1120 User Manual 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
121. t 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 SCXI 1000 or SCXI 1001 Chassis SCANCON X Data Acquisition Board Cable Eight Isolated Assembly Floating Timing Output Single Ended Inputs SLOT X Analog Input Figure 3 8 Single Module Multiplexed Scanning Direct Single Module Multiplexed Scanning Indirect In this mode the SCXI 1120 is not directly cabled to the data acquisition board Instead you connect another module to the data acquisition board and the analog output of the SCXI 1120 is sent over Analog Bus 0 through the intermediate module and then to the data acquisition board The SCXI 1120 receives its MUXCOUNTER clock from TRIGO which is sent by the intermediate module as shown in Figure 3 9 Slot 0 operation is the same for direct connection scanning SCXI 1000 or SCXI 1001 Chassis SCANCON X Data Acquisition Board Cable Assembly Timing Output Analog Input Analog Bus 0 Figure 3 9 Single Module Multiplexed Scanning Indirect Multiple Module Multiplexed Scanning In this mode all the modules tie into Analog Bus 0 and SCANCON enables the output of their amplifiers The module that is directly cabled to the data acquisition board sends SCANCLK National Instruments Corporation 3 15 SCXI 1120 User Manual Theory of Operation Chapter 3
122. t must be performed by properly trained and qualified medical personnel and all traditional medical safeguards equipment and procedures that are appropriate in the particular situation to prevent serious injury or death should always continue to be used when National Instruments products are being used National Instruments products are NOT intended to be a substitute for any form of established process procedure or equipment used to monitor or safeguard human health and safety in medical or clinical treatment Contents ADOUC This Manual seein E ee xi Organization of This Manual isanidinnmdiiiaitedues xi Conventions Used in This Manual n es eat se ten xii Related Documentation n csnssnsinnssienisii seines sisisi as iia E sS xiii Customer CommCat ON eses sisii t eaa Sn Er RS ass xiii Chapter 1 Introduction oiec a a e tnt dei ii 1 1 What Your Kit Should Contain 1252 ne italiens 1 2 Optional SOIN ATC as us ne e taeae a r de E e ne T ESEESE NSE 1 2 Optional EQuipme nt o s tintin tienne dentiste 1 3 CUSTOM Cables Tr sr Ans nn a tae oid a a e a he eh 1 4 Unpacking Lin ae E a A E nn en a tue 1 4 Chapter 2 Configuration and Installation 2 1 Mod le OPIS TALON e ESS NS tn ne ne Dans s de 2 1 Digital Signal Connections ssh n dei seine 2 4 Jumper WE nn a een nr ee lt een ei ant tees sass 2 5 Jumper WAS oes ccaciecdeselescabeussaeeaslsdussecquvnes sus Sedeadeeawacaceuaboeneetanansauebebenoeasens 2 5 Jumpet WV PRO ASE AR RE nae ations
123. ten the top and bottom captive screws on the back of the terminal block into the screw holes in the front panel This will hold the SCXI 1302 securely in place Check the installation SCXI 1351 One Slot Cable Extender The SCXI 1351 cable extender is a miniature SCXI 1340 cable assembly Instead of connecting to an MIO board 1 m away the SCXI 1351 female rear connector connects to the male breakout connector of a module that must be in the rear connector space of the slot to the left The SCXI 1351 has a female mounting bracket connector that mates with the rear signal connector of a module and also has a male breakout connector on the ribbon cable for connecting to a feedthrough panel or more cable extenders National Instruments Corporation E 9 SCXI 1120 User Manual 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 SCX 1180 Installation section as shown in Figure E 2 4 Plug the mounting bracket connector to the module rear signal connector Make sure the alignment tab on the bracket enters the upper module guide of the chassis 5 Screw the mounting bracket to the threaded strips in the rear of the chassis Check the installati
124. ter 3 The major components of the SCXI 1120 are as follows e SCXIbus connector e Digital interface e Digital control circuitry e 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 The theory of operation of each of these components is explained in the rest of this chapter SCXIbus Connector Figure 3 2 shows the pinout of the SCXIbus connector SCXI 1120 User Manual 3 2 National Instruments Corporation Chapter 3 Theory of Operation V V V V CHSGND CHSGND CHSGND CHSGND 5 V 5 V SPICLK MOSI TRIGO SS SCANCON Figure 3 2 SCXIbus Connector Pin Assignment National Instruments Corporation 3 3 SCXI 1120 User Manual Theory of Operation Chapter 3 SCXIbus Connector Signal Descriptions Pin Signal Name Description Al B1 C1 D1 GUARD Guard Shields and guards the analog bus lines A2 D2 A3 B3 from noise C3 D3 A4 D4 AS B5 C5 Ds A6 D6 B2 ABO Analog Bus 0 Positive analog bus 0 line Used to multiplex several modules to one analog signal C2 ABO Analog Bus 0 Negative analog bus 0 line Used to multiplex several modules to one analog signal C13 C17 A21 CHSGND Chassis Ground Digital and analog ground B21 C21 D21 referenc
125. ter modules jumper W44 does not exist e User configurable jumpers Jumper W43 carries the SCXIbus MISO line after buffering to the SERDATOUT signal on the rear signal connector On Revision C and later modules jumper 42 connects a pullup resistor to the SERDATOUT signal on the rear signal connector Jumper W46 configures the guard the analog output ground and enables the Pseudodifferential Reference mode Jumpers W1 through W8 configure the first stage gain of channels 0 through 7 respectively Jumpers W9 through W 16 configure the second stage gain of channels O through 7 respectively Jumpers W17 through W24 configure the first stage filtering of input channels 0 through 7 respectively Jumpers W25 through W40 configure the second stage filtering of input channels 0 through 7 respectively Jumper W41 directly connects the temperature sensor to the rear signal connector To do so set jumper W46 in the AB R2 or AB RO position first Further configuration of the board is software controlled and will be discussed later in this chapter Digital Signal Connections The four digital signal connection jumpers have position 1 marked on the board Position 3 is not explicitly marked on the board The SCXI 1120 has three jumpers dedicated for communication between the data acquisition board and the SCXIbus These jumpers are W42 W43 and W44 SCXI 1120 User Manual 2 4 National Instruments Corporation Chapter 2 Conf
126. the MCHOX 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 Reserved This bit should always be written to 0 Scan Clock Enable This bit determines whether MUXCOUNTER will increment on each clock signal the clock source is determined by CLKSELECT or keep its loaded value If SCANCLKEN is set to 1 MUXCOUNTER will be clocked during scans If SCANCLKEN is cleared to 0 MUXCOUNTER will not be clocked Scan Control Enable This bit when set to 1 enables the SCANCON signal Analog Bus 0 Enable This bit determines whether Analog Bus 0 on the SCXIbus drives MCHO on the rear signal connector If ABOEN is cleared to 0 Analog Bus 0 doesnot drive MCHO If ABOEN is set to 1 Analog Bus 0 drives MCHO0 through a buffer and a Analog Bus 0 is connected to MCHO Forced Output Enable This bit determines whether the module will drive the MCHO pins on the rear signal connector with either the selected channel output or the MTEMP signal depending on the state of RTEMP If FOUTEN is cleared to 0 the MCHO pins will be driven through a buffer by the selected channel output or the MTEMP line If FOUTEN is set to 1 the MCHO pins will not be driven by the selected chan
127. this after you have programmed the modules and Slot 0 Note For multiplexed scanning with an MIO board it is important that you follow the instructions in the channel scanning sections not the single channel sections Although you may be using only one MIO board channel the channel scanning programming will ensure that the MIO board outputs SCANCLK which is needed by the SCXI 1120 and Slot 0 Clear the A D Circuitry in the Lab LC User Manual Do not continue to the part called Program the Sample Interval Counter You will do this after you have programmed the modules and Slot 0 Clear the A D Circuitry in the Lab PC User Manual the Lab PC User Manual and the PC LPM 16 User Manual Do not continue to the part called Start and Service the Data Acquisition Operation You will do this after you have programmed the modules and Slot 0 Clear the A D Circuitry in the Lab NB User Manual Do not continue to the part called Program the Sample Interval Counter Counter AO You will do this after you have programmed the modules and Slot 0 National Instruments Corporation 5 7 SCXI 1120 User Manual 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 This s
128. to contact us this manual contains comment and configuration forms for you to complete These forms are in Appendix G Customer Communication at the end of this manual National Instruments Corporation xiii 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 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 Refer to your chassis manual for a description of the different module classes If external excitation is provided thermistors RTDs and strain gauges can also be measured The SCXI 1120 can operate in two output modes in the Parallel Output mode with all eight input channels connected in parallel to eight data acquisition board channels or in the Multiplexed Output mode with all eight channels multiplexed into a single data acquisition board channel The SCXI 1120 operates with full functionality with the National Instruments MIO 16 boards You can use the Lab NB the Lab PC the Lab PC the Lab LC and the PC LPM 16 boards with the SCXI 1120 but these boards cannot scan the module when it is configured in the Multiplexed Output mode These boards can
129. tocol National Instruments Corporation 3 5 SCXI 1120 User Manual 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 SLOTOSEL Buffered Digital Signal Controls SERCLK Smt 3 s S S E i N Ss d C7 SERDATOUT Figure 3 3 Digital Interface Circuitry Block Diagram The digital interface circuitry is divided into a data acquisition section and an SCXIbus section The SCXI 1120 connects to the SCXIbus via a 4x24 metral receptacle and to the data acquisition board via a 50 pin ribbon cable header The digital interface circuitry buffers the digital signals from the data acquisition board and the SCXIbus and sends signals back and forth between the data acquisition board and the SCXIbus SCXI 1120 User Manual 3 6 National Instruments Corporation Chapter 3 Theory of Operation Digital Control Circuitry Figure 3 4 diagrams the SCXI 1120 digital control Serial Data Out Module ID Register Buffered Input Channel Serial Data In Select Configuration Register Buffered Digital Control Signals Output SCANCLK Stage Path Control 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 The Configuration Register is a two byte se
130. ual The SCXI 1120 User Manual is organized as follows e Chapter 1 Introduction 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 e Chapter 2 Configuration and Installation describes the SCXI 1120 jumper configurations installation of the SCXI 1120 into the SCXI chassis signal connections to the SCXI 1120 and cable wiring e Chapter 3 Theory of Operation contains a functional overview of the SCXI 1120 module and explains the operation of each functional unit making up the SCXI 1120 e Chapter 4 Register Descriptions describes in detail the SCXI 1120 Module ID Register the Configuration Register the Slot 0 registers and multiplexer addressing e Chapter 5 Programming contains a functional programming description of the SCXI 1120 and Slot 0 e Appendix A Specifications lists the specifications for the SCXI 1120 e Appendix B Rear Signal Connector describes the pinout and signal names for the SCXI 1120 50 pin rear signal connector including a description of each connection e Appendix C SCXIbus Connector describes the pinout and signal names for the SCXI 1120 96 pin SCXIbus connector including a description of each connection National Instruments Corporation xi SCXI 1120 User Manual About This Manual e Appendix D SCXI 1120 Front Connector describes the pinout and signal nam
131. ultiplexed Output mode Parallel Output mode Filtering jumper selectable Output selection time with 5 V step all gains 0 012 accuracy 0 006 accuracy 0 0015 accuracy 1 2 5 10 20 50 100 200 500 1 000 2 000 5 V 8 0 15 of full scale 6 UV 3 mV 0 2 wV C 200 u V C 20 ppm C 80 pA 40 MQ 50 kQ 50 kQ 100 Q 330 Q 4 Hz 10 dB or 10 kHz 3 dB 3 pole RC 5 2 usec typical 7 sec maximum 10 usec 20 usec lIncludes the combined effects of the SCXI 1120 and the AT MIO 16F 5 2Includes the combined effects of the SCXI 1120 and the AT MIO 16X National Instruments Corporation A 1 SCXI 1120 User Manual Specifications Appendix A Rise time 4 Hz 0 12 sec 10 kHz 70 usec Slew rate 0 15 V usec Noise 400 kHz bandwidth Input gain 1 000 4 Hz filter 100 nVrms 10 kHz filter 4 uVrms Output gain 1 4 Hz 150 uVrms 10 kHz 1 mVrms Operating common mode voltage 50 or 60 Hz Channel to channel or Channel to earth 250 Vrms5 Common mode rejection ratio 50 or 60 Hz 1 kQ in input leads 160 dB minimum at 4 Hz bandwidth NMR 50 or 60 Hz 60 dB at 4 Hz bandwidth Input protection continuous 250 Vrms maximum Output protection Continuous short to ground Power dissipation 7 5 W maximum Cold Junction Sensor SCXI 1320 Accuracy 1 0 from 0 to 55 C Output 10 mV C SCXI 1328 Accuracy 0 35 from 15 to 35 C 0 65 from 0 to 15 and 35 to 55 C Output 1 91
132. umber 12 gt 3 3 1 1 4 13 2 13 a i 3 3 13 4 8 Other solutions are possible In the section earlier in this chapter 3 Programming the Slot 0 Hardscan Circuitry step 3 Write the Slot 0 scan list to the FIFO consists of the following steps 1 Select Slot 14 in Chassis 1 2 Write XXXXX001 10000100 over MOSI 3 Toggle SLOTOSEL 4 Write XXXXX110 00001010 over MOSI 5 Select Slot 14 in Chassis 2 6 Write XXXXX110 00000100 over MOSI 7 Toggle SLOTOSEL 8 Write XXXXX101 00000110 over MOSI 9 Toggle SLOTOSEL 10 Write XXXXX110 00000011 over MOSI 11 Select Slot 14 in Chassis 3 12 Write XXXXX110 00001011 over MOSI SCXI 1120 User Manual 5 14 National Instruments Corporation Chapter 5 Programming 13 Toggle SLOTOSEL 14 Write XXXXX001 00000010 over MOSI 15 Toggle SLOTOSEL 16 Write XXXXX011 10000000 over MOSI 17 Select Slot 0 in Chassis 0 National Instruments Corporation 5 15 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 Output range Number of channels Gain accuracy Offset voltage Input Output Stability versus ambient temperature Input offset drift Output offset drift Gain drift Input bias current Input resistance Normal Power off Overload Output resistance M
133. urned off 2 Install the SCXI module in the chassis 3 Connect one end of the ribbon cable to the adapter board rear connector This is the 50 pin connector of the SCXI 1344 cable 4 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 5 Screw the rear panel to the threaded strips in the rear of the chassis SCXI 1120 User Manual E 4 National Instruments Corporation 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 nstallation 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 The 1342 cable assembly consists of two pieces an adapter board and a 50 conductor ribbon cable that connects the PC LPM 16 board to the adapter board The adapter board converts the signals from the PC LPM 16 I O connector to a format compatible with the SCXI 1120 rear signal connector pinout The adapter board also has an additional male breakout connector that makes the unmodified PC LPM 16 signals accessible to an SCXI 1180 feedthrough panel or SCXI 1181 breadboard module
134. utput Figure 3 11 Multiple Chassis Scanning SCXI 1120 User Manual 3 16 National Instruments Corporation 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 A detailed bit description of each register is given The individual register description gives the type word size and bit map of the register followed by a description of each bit The register bit map shows a diagram of the register with the MSB shown on the left bit 15 for a 16 bit register bit 7 for an 8 bit register and the LSB shown on the right bit 0 A rectangle is used to represent each bit Each bit is labeled with a name inside its rectangle An asterisk after the bit name indicates that the bit is inverted negative logic The Module ID register has a unique format and is described in the Module ID Register section In many of the registers several bits are labeled with an X indicating don t care bits When you write to a register you may set or clear these bits without effect SCXI 1120 Registers The SCXI 1120 has t
135. utput 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 nonreferenced single ended input Once bit Output Reference signal parts per million random access memory Read bit Reset signal root mean square referenced single ended input Reserved bit signal resistance temperature detector Read Temperature bit Real Time System Integration Scan Clock signal Scan Clock Enable bit Scanning Control signal Scan Control Enable bit Signal Conditioning eXtensions for Instrumentation bus Software Developer s Kit Glossary 3 SCX1 1120 User Manual Glossary sec SERCLK SERDATIN SERDATOUT SL SLOTOSEL SPI SPICLK SS T tempco TRIGO UL V V VDC Vin Vox VoL Vrms SCXI 1120 User Manual 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 temperature coefficient Trigger 0 signal Underwriters Laboratory volts Positive Analog Supply signal Negative Analog Supply signal volts direct current input logic high voltage input logic low voltage output logic high voltage output logic low voltage volts root mean square watts Glossary 4
136. w 2 For each bit to be read SERCLK 0 SERCLK 1 Clock the data Read the level of the SERDATOUT line 3 Pull SLOTOSEL low to deassert the SS line and establish conditions for writing a new slot select number to the Slot 0 Slot Select Register 4 If you are not selecting another slot you should write zero to the Slot 0 Slot Select Register Figure 2 16 illustrates a read of the SCXI 1120 Module ID Register SLOTOSEL TN SS 4 l OA A l SERDATOUT Tdelay 000 o ofifo 0000000000000000000000000 a byte 0 4 byte 1 0 byte 2 0 byte 3 0 SS high to SERDATOUT high 350 nsec maximum Figure 2 16 SCXI 1120 Module ID Register Timing Diagram For further details on programming these signals refer to Chapter 5 Programming National Instruments Corporation 2 31 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 o sets Nonisolated Section Input Channel 0 Digital Interface and Control w 9 d Q E ay MN 7 d 7 Front Connector D Input Channel 7 Temperature Sensor Figure 3 1 SCXI 1120 Block Diagram National Instruments Corporation 3 1 SCXI 1120 User Manual Theory of Operation Chap
137. wn physical Slot Select Register all are written to at the same time The jumper settings in Slot 0 of a chassis determine with which chassis number Slot 0 is identified From the software perspective only one Slot Select Register exists in a system composed of multiple chassis The HSCR and FIFO Register on the other hand are unique to each chassis and you must program them separately National Instruments Corporation 4 5 SCXI 1120 User Manual 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 SLOTOSEL 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 SLOTOSEL is low Type Write only Word Size 16 bit Bit Map 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 CHS3 CHS2 CHS CHSO Bit Name Description 15 9 X Don t care bits Unused 8 4 CHS lt 4 0 gt Chassis Bit 4 through 0 These bits determine which chassis is selected On the SCXI 1000 chassis these are don t care bits 3 0 SL lt 3 0 gt Slot Bit 3 through 0 These bits determine which slot in the selected chassis is selected SCXI 1120 User Manual 4 6 National Instruments Corporation Chapter 4 Register Descriptions Hardscan Control Register HSCR The HSCR
138. wo registers The Module ID Register is a four byte read only register that contains the Module ID number of the SCXI 1120 The Configuration Register is a 16 bit write only register that controls the functions and characteristics of the SCXI 1120 National Instruments Corporation 4 1 SCXI 1120 User Manual 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 The Module ID Register is reinitialized to its original value each time the SCXI 1120 is deselected by the SS signal on the backplane Type Read only Word Size 4 byte Bit Map SCXI 1120 User Manual 4 2 National Instruments Corporation 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 Type Write only Wor
139. ws a parts locator diagram for the SCXI 1328 terminal block SCXI 1120 User Manual 2 20 National Instruments Corporation Chapter 2 Configuration and Installation Figure 2 9 SCXI 1320 Parts Locator Diagram National Instruments Corporation 2 21 SCXI 1120 User Manual Configuration and Installation Chapter 2 Figure 2 10 SCXI 1328 Parts Locator Diagram SCXI 1120 User Manual 2 22 National Instruments Corporation 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 Rear Signal Connector Note If you will be using the SCXI 1120 with a National Instruments data acquisition board and cable assembly you do not need to read the remainder of this chapter If you will also be using the SCXI 1180 feedthrough panel the SCXI 1343 rear screw terminal adapter or the SCXI 1351 one slot cable extender with the SCXI 1120 you should read this section Figure 2 11 shows the pin assignments for the SCXI 1120 rear signal connector National Instruments Corporation 2 23 SCXI 1120 User Manual Configuration and Installation
140. zed by deasserting Slot Select After the 32 bits of data are read from the Module ID Register further data will be zeros until reinitialization occurs To write to the Configuration Register follow these steps 1 Initial conditions SS asserted low SERDATIN don t care DAQD A 0 indicates data will be written to Configuration Register SLOTOSEL 1 SERCLK 1 and has not transitioned since SS went low 2 For each bit to be written Establish the desired SERDATIN level corresponding to this bit SERCLK 0 SERCLK 1 Clock the data 3 Pull SLOTOSEL low to deassert the SS line and establish conditions for writing a new slot select number to the Slot 0 Slot Select Register 4 If you are not selecting another slot you should write zero to the Slot 0 Slot Select Register Figure 2 15 illustrates a write to the SCXI 1120 Configuration Register of the binary pattern 10000011 00001111 SCXI 1120 User Manual 2 30 National Instruments Corporation Chapter 2 Configuration and Installation SLOTOSEL SS SERDATIN XX 110 0 0 0 of1 ilo 0 0 oft 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 1 Make sure DAQD A does not go low or erroneous data will be written to the Configuration Register SLOTOSEL 1 SERCLK 1 and has not changed since SS went lo

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