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SCXI-1140 User Manual - National Instruments

1. Appendix E SCXI 1140 Cabling This appendix describes how to use and install the hardware accessories for the SCXI 1140 e SCXI 1340 cable assembly e SCXI 1341 Lab NB Lab PC or Lab PC cable assembly e SCXI 1342 PC LPM 16 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 rear screw terminal adapter SCXI 1340 Cable Assembly The SCXI 1340 cable assembly connects an MIO 16 board to an SCXI 1140 module The SCXI 1340 consists of a mounting bracket at one end and a 50 conductor ribbon cable that has a female 50 pin 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 the 50 pin female mounting bracket connector that connects to the rear signal connector of the module A male breakout connector is near the mounting bracket on the ribbon cable You can use this male breakout connector to extend the signals of the MIO 16 board to an SCXI 1180 feedthrough panel or an SCXI 1181 breadboard module All 50 pins from the MIO 16 board go straight to the rear signal connector You can use a standard 50 pin ribbon cable in lieu of the SCXI 1340 cable assembly but the SCXI 1340 has the following advantages over the ribbon cable The SCXI 1340 provides strain relief so the cable cannot be accidentally disconnected The S
2. There are two potentiometers pots to adjust for each channel These are set at the factory and should not need to be readjusted for most applications The pots adjust input offset voltage and output offset voltage for each of the eight channels Gain and linearity are not adjustable For detailed specifications of offset gain and linearity error see Appendix A Specifications Input offset is any error voltage that appears to be added to the input signal that is its effect is multiplied by the gain of the instrumentation amplifier Output offset is any error voltage that appears to be added to the output signal that is its effect is independent of the gain of the instrumentation amplifier At a fixed gain these errors are indistinguishable thus it is necessary to switch between gains to properly calibrate the SCXI 1140 Your accuracy needs determine how carefully the offsets need to be calibrated A typical requirement might be for total offset referred to output to be less than half of an LSB of the data acquisition board being used For example a 12 bit 20 V system has a resolution of 20 V 2 2 4 88 mV Calibration to under 2 mV would thus be sufficient for most applications The SCXI 1140 is factory calibrated to have total offset referred to output of less than 2 mV at low gains Table 6 1 shows which pots to adjust for each type of offset for each channel and which DIP switch selects the gain for each channel Refer to the parts
3. 2 Ao 0g3 2 x or Seals ot ees SUrE ag o 9 of 1969 ES Mo ctRMOCLLRJO 0000000 lt e Ht EK 8 a SL Eat chee G smie S e 0 ac eg L Bs c lo o 3 VE j 3 T p Eire LHH w c P Te ez 2 E z a Ed O 3 zh m zZz a z z s of 3 3 Som d S8 s CA 96 3 7 3x 2 in ag g n OG Sa 9 oS oa o3 a SCXI 1140 User Manual Figure 2 1 SCXI 1140 Parts Locator Diagram National Instruments Corporation Chapter 2 Configuration and Installation The jumpers are used as follows e Fixed jumpers Jumper W10 is reserved and you should not reconfigure it On Revision A and B modules jumper W11 carries the SLOTOSEL signal from the rear signal connector after buffering to the SCXIbus INTR line Leave jumper W11 in the factory set position position A B On Revision C or later modules jumper W11 does not exist On Revision A and B modules jumper W 13 is unused and you should not connect it e User configurable jumpers Jumpers W1 through W8 ground the negative inputs of each input through 100 KQ resistors for floating sources and transducers Jumper W9 allows the module to connect to a single ended data acquisition board instead of a full differential board Jumper W12 determines the connections between the SCXIbus guard chassis ground and the data acquisition board analog ground Jumper W14 carries the SCXIbus MISO line after buffering to the SERDATOUT signal on the r
4. 5 3 register selection and write procedure 5 2 to 5 3 SCXI 1140 rear signal connector pin equivalences 5 2 registers Configuration Register description of 4 3 to 4 5 digital control circuitry 3 7 write procedure 2 28 Module ID Register description of 4 2 digital control circuitry 3 7 read procedure 2 28 Slot 0 Register FIFO Register 4 9 Hardscan Control Register 4 8 overview 4 6 Slot Select Register 4 7 RESET signal 3 5 C 3 RSVD bit 4 3 4 8 RSVD signal 2 20 3 5 B 3 C 3 SCXI 1140 User Manual Index S sampling specifications A 2 SCANCLK signal definition of 2 20 B 3 digital timing 2 22 module programming 5 14 to 5 15 multiplexer addressing 3 8 scanning modes 3 12 to 3 14 timing requirements 2 23 SCANCLKEN bit 4 5 SCANCON signal definition of 3 6 C 4 Edge Triggered Mode operation 3 9 scanning modes 3 12 to 3 14 Track and Hold control circuitry 3 9 SCANCONEN bit 4 5 4 8 SCANEN bit 4 5 scanning measurements acquisition enable triggering and servicing 5 18 data acquisition board setup programming 5 9 to 5 12 Counter 1 and SCANDIV 5 11 module programming multiple chassis scanning 5 16 to 5 17 multiple module multiplexed scanning 5 15 to 5 16 single module multiplexed scanning direct 5 13 single module multiplexed scanning indirect channel scanning from other modules 5 13 to 5 14 channel scanning from SCXI 1140 via another module 5 14 single module parallel scann
5. Hardscan Control Register 4 8 overview 4 6 SCXI 1140 User Manual Index Slot Select Register 4 7 slot select timing diagram 2 26 SLOTOSEL signal carried by jumper W11 2 3 communicating on SPI bus 2 25 to 2 28 definition of 2 19 B 3 digital input 2 20 register selection and write procedure 5 2 to 5 3 software optional 1 2 to 1 3 software calibration See calibration procedures specifications AC specifications A 2 DC specifications A 1 operating environment A 3 physical A 3 power A 2 sampling A 2 storage environment A 3 SPICLK signal definition of 3 5 C 3 synchronous communication link 3 6 SS signal definition of 3 6 C 4 synchronous communication link 3 6 storage environment for SCXI 1140 A 3 T technical support G 1 terminal block configuring 2 16 theory of operation analog circuitry 3 10 to 3 11 block diagram of SCXI 1140 3 2 digital interface 3 3 to 3 6 digital control circuitry 3 7 digital interface circuitry 3 3 SCXIbus connector 3 3 to 3 6 functional overview 3 1 3 3 scanning modes 3 11 to 3 15 multiple chassis scanning 3 15 multiple module multiplexed scanning 3 15 overview 3 11 to 3 12 single module multiplexed scanning direct scanning 3 13 indirect scanning 3 14 single module parallel scanning 3 12 timing control circuitry illustration of 3 7 multiplexer addressing 3 8 SCXI 1140 User Manual Track and Hold control circuitry 3 9 timing control circuitr
6. In Scan mode the outputs of all eight channels appear here in sequence Outputs from other modules can also appear here through the analog bus In Nonscanning mode OUTPUT is the output of Channel 0 Output Reference Connects to the module analog ground unless an output from another module is selected through the analog bus in which case the pins connect to the analog ground for the selected module Analog Outputs Outputs of channels 1 through 7 independent of whether or not scanning is enabled Analog Ground Connect to the module analog ground They are used as the reference points for AOUT I through AOUTT Analog Ground No Connect Connected to the module analog ground when jumper W9 is in position B C When the jumper is in position A B this pin is unconnected Digital Ground Supply the reference for data acquisition digital signals and are tied to the module digital ground Serial Data In Taps into the SCXIbus MOSI line to send serial input data to a module or Slot 0 Serial Data Out Taps into the SCXIbus MISO line to accept serial output data from a module if jumper W14 is in position A B Otherwise it is unconnected B 2 O National Instruments Corporation Appendix B Pin 27 43 29 36 37 39 46 All other pins are not connected Signal Name DAQD A RSVD SLOTOSEL SCANCLK SERCLK TRACK HOLD HOLDTRIG O National Instruments Corporation Rear Signa
7. Number Name A B C Name HOLDTRIG 45V D A t A I oo oO o o o o o O o O o o o o o o o o o o O o o o o o o o O o o o o o Figure 2 4 SCXI 1140 Front Connector Pin Assignment SCXI 1140 User Manual 2 10 O National Instruments Corporation Chapter 2 Configuration and Installation Front Connector Signal Connection Descriptions Pin Signal Name A32 A30 A26 INO through IN7 A24 A20 A18 A14 A12 C32 C30 C26 INO through IN7 C24 C20 C18 C14 C12 A28 A22 A16 AGND C28 C22 C16 A6 HOLDTRIG A2 C6 A8 C8 DGND A4 5V Analog Input Channels Description Positive Input Channels Connect to the noninverting inputs of the instrumentation amplifier of each channel Negative Input Channels Connect to the inverting inputs of the instrumentation amplifier of each channel Analog Ground Connect to the module analog ground HOLDTRIG Can be programmed to input or output the Hold Trigger signal for the module The Hold Trigger signal can place the module into Hold mode This signal is also brought out to the rear signal connector Digital Ground Connect to the module digital ground Digital Five Volts This signal is for test purposes only and should not be loaded by more than 25 mA Only on Rev C and later modules All eight channels have fully differential inputs so the signals you are measuring should be ground referenced If they are no
8. no change 5 00000001 01110000 00011010 01100111 to Slot 3 no change Example 3 You want to scan six channels on an SCXI 1140 in Slot 4 of Chassis 1 then seven channels of an SCXI 1140 in Slot 11 of Chassis 2 three channels of an SCXI 1140 in Slot 3 of Chassis 3 and five channels of an SCXI 1140 in Slot 8 of Chassis 3 Assuming you have correctly cabled and programmed the modules the Slot 0 scan lists should be as follows FN a Entry Slot Count bal r3 ad EF al Number Bu d Other solutions are possible The step labeled Write the Slot 0 scan list to the FIFO in the section 3 Programming the Slot 0 Hardscan Circuitry earlier in this chapter consists of the following steps 1 Select Slot 14 in Chassis 1 2 Write XXXXX001 10000101 over MOSI 3 Toggle SLOTOSEL 4 Write XXXXX110 00001110 over MOSI SCXI 1140 User Manual 5 20 O National Instruments Corporation Chapter 5 10 11 12 13 14 15 16 I7 Select Slot 14 in Chassis 2 Write XXXXX110 00000101 over MOSI Toggle SLOTOSEL Write XXXXX101 00000110 over MOSI Toggle SLOTOSEL Write XXXXX110 00000111 over MOSI Select Slot 14 in Chassis 3 Write XXXXX110 00001100 over MOSI Toggle SLOTOSEL Write XXXXX001 00000010 over MOSI Toggle SLOTOSEL Write XXXXX011 10000100 over MOSI Select Slot 0 in Chas
9. 1 and SCANDIV 5 11 to 5 12 data acquisition board setup programming 5 9 to 5 11 module programming 5 12 to 5 17 multiple chassis scanning 5 16 to 5 17 multiple module multiplexed scanning 5 15 to 5 16 single module multiplexed scanning direct 5 13 single module multiplexed scanning indirect 5 13 to 5 14 single module parallel scanning 5 12 to 5 13 programming Slot 0 hardscan circuitry 5 17 scanning examples 5 18 to 5 21 single channel measurements direct measurements multiplexed output 5 6 parallel output 5 6 indirect measurements measurements from other modules 5 7 measurements from SCXI 1140 via another module 5 7 to 5 8 putting SCXI 1140 into Track or Hold mode Lab NB Lab PC Lab PC Lab LC 5 5 O National Instruments Corporation Index MIO 16 5 4 PC LPM 16 5 5 Track and Hold modes edge sensitive hold trigger 5 3 level sensitive hold trigger 5 3 overview 5 3 R RD bit 4 8 rear signal connector 2 17 to 2 29 analog output signal connections 2 20 to 2 21 digital I O signal connections 2 2 to 2 22 digital input signals 2 21 digital output signals 2 21 digital timing signals 2 22 SCXIbus to SCXI 1140 pin equivalences 2 21 3 6 specifications and ratings for digital I O and timing lines 2 21 pin assignments 2 18 B 1 pin descriptions 2 19 to 2 20 B 2 to B 3 SCXI 1140 and MIO 16 pinout equivalences E 2 SCXI 1140 pin equivalences 5 1 register writes 5 1 to 5 3 initialization
10. 3 For each bit starting with the most significant bit set the bits as follows a SERDATIN bit to be sent These bits are the data that is being written to the Slot Select Register b SERCLK 0 c SERCLK 1 This rising edge clocks the data If you are using an MIO 16 board a write to the EXTSTROBE Register will cause EXTSTROBE to pulse low thus accomplishing steps b and c 4 Set SLOTOSEL to 1 to 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 selected When no communication is taking place between the data acquisition board and any modules it is recommended that you write zero to the Slot Select Register to ensure that no accidental writes occur SCXI 1140 User Manual 2 26 O National Instruments Corporation Chapter 2 Configuration and Installation I I SLOTOSEL N ITss dis l SS X l i Chassis Y i SS 11 Telk wait gt s I I Chassis 9 _r Iss en SERCLK I I I TslotOsel wait SERDATIN SX RKB PSR NN 0 Chassis ID 9 Slot 11 Tss dis SLOTOSEL low to SS disabled 200 nsec maximum Telk _ wait SLOTOSEL low to first rising edge on SERCLK 75 nsec minimum TslotOsel wait last rising edge on SERCLK to SLOTOSEL high 250 nsec minimum Tss en i SLOTOSEL high to SS enabled 350 nsec maximum Figure 2 18 Slot Sele
11. 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 write zero to the Slot 0 Slot Select Register Figure 2 21 illustrates a read of the SCXI 1140 Module ID Register SLOTOSEL N SS y l l Tdelay PERDATOUT oooojijo0o0000000000000000000000000 amp l eee byte 0 8 byte 1 20 byte2 20 byte 3 0 Tdelay SS high to SERDATOUT high 350 nsec maximum Figure 2 21 SCXI 1140 Module ID Register Timing Diagram For further details on programming these signals refer to Chapter 5 Programming O National Instruments Corporation 2 29 SCXI 1140 User Manual Chapter 3 Theory of Operation This chapter contains a functional overview of the SCXI 1140 module and explains the operation of each functional unit making up the SCXI 1140 Functional Overview The SCXI 1140 consists of eight channels each one comprising an instrumentation amplifier with DIP switch programmable gains of 1 10 100 200 300 500 600 700 or 800 and a track and hold amplifier The analog inputs are overvoltage protected All eight channels are placed in Hold mode simultaneously Internal counters are used for automatic scanning You can operate multiple SCXI 1140 boards under SCXIbus control or directly from a data acquisition board The outputs of all eight channels are available at the output connector You can also mult
12. 5 9 SCXI 1140 User Manual Programming Chapter 5 The formulas you should use are as follows j Sample interval timebase number of counts entered into Counter 3 High time sample interval number of samples per scan interval High number high time timebase Scan interval time desired time interval between the start of each scan Low time scan interval time high time Low number low time timebase Write FFB2 hex to the Am9513A Command Register to disarm Counter 2 Write FF02 hex to the Am9513A Command Register to select Counter 2 Mode Register Write the mode value to the Am9513 Data Register to store the Counter 2 mode value Use one of the following hex mode values 4B62 Selects 1 MHz clock 4C62 Selects 100 kHz clock 4D62 Selects 10 kHz clock 4E62 Selects 1 kHz clock 4F62 Selects 100 Hz clock 4562 Selects signal at SOURCES input as it clocks the rising edge of the signal 6 MHz maximum Write FFOA hex to the Am9513A Command Register to select Counter 2 Load Register Write the low number to the Am9513 Data Register to store the Counter 2 Load value This number must be between 2 and 65 535 Write FF12 hex to the Am9513A Command Register to select Counter 2 Hold Register Write the high number to the Am9513 Data Register to store the Counter 2 Hold value This number must be between 2 and 65 535 Write FF42 hex to the Am9513A Command Register to load Counter 2 Write FFE2 hex
13. An SCXI 1000 chassis has SCXI 1140s in slots 1 2 3 and 4 The SCXI 1140 in Slot 4 is cabled to an MIO 16 board You want to scan channels 2 through 5 on the SCXI 1140 in Slot 1 channels 0 through 6 on the SCXI 1140 in Slot 4 and channels 7 through 3 on the SCXI 1140 in Slot 3 Programming steps l Program your data acquisition board as described in the Data Acquisition Board Setup Programming section of this chapter Following the procedure given in the Register Writes section write 00000000 00000000 00000000 00000000 to the Configuration Register of the SCXI 1140 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 gt C co C Following the procedure given in the Register Writes section write 00000001 00000 00010001 10100111 tothe Configuration Register of the SCXI n A Eus 3 un ke et P ing the procedure given in the Register Writes section write 000 011010 01100111 to the Configuration Register of the SCXI 114 om 0 in Slot 1 Following the procedure given in the Register Writes section write 00000001 01110000 00011010 01100111 to the Configuration Register of the SCXI 1140 in Slot 3 Notice that after Channel 7
14. C 2 SCXIbus equivalents for rear signal connector 2 21 3 6 signal descriptions 3 5 to 3 6 C 3 to C 4 SERCLK signal communicating on SPI bus 2 26 to 2 29 definition of 2 20 B 3 digital input 2 21 register selection and write procedure 5 2 to 5 3 timing requirements 2 27 O National Instruments Corporation SERDATIN signal communicating on SPI bus 2 26 to 2 29 definition of 2 19 B 2 digital input 2 21 register selection and write procedure 5 2 timing requirements 2 27 SERDATOUT signal communicating on SPI bus 2 26 to 2 29 definition of 2 19 B 2 digital output 2 21 serial data timing diagram 2 27 signal connections communication signals 2 26 to 2 29 Configuration Register write timing diagram 2 28 reading from Module ID Register 2 29 serial data timing diagram 2 27 slot select timing diagram 2 27 writing to Configuration Register 2 28 writing to Slot 0 2 26 front connector 2 9 to 2 17 analog input channels 2 11 to 2 15 floating AC coupled signal connection 2 13 floating signal connection 2 12 formulas for common mode input range 2 14 ground offset AC coupled signal connection 2 13 ground referenced AC coupled signal connection 2 13 ground referenced signal connection 2 12 warning against exceeding input ranges 2 14 cable connection 2 16 connector and shell 2 15 digital input 2 14 pin assignments 2 10 D 2 signal descriptions 2 11 D 2 terminal block 2 17 rear signal connector
15. Channel Select Determine the channel number zero to seven that is loaded into the output multiplexer to determine the analog channel to be read during a single read or the starting channel on the module for a scanned data acquisition CHAN2 is the MSB 14 4 RSVD Reserved Should always be written to zero 13 TRACK HOLDEN Track Hold Enable Specifies whether the module HOLD signal is driven onto the TRACK HOLD line on the rear signal connector If you set this bit the TRACK HOLD line is driven If you clear this bit the TRACK HOLD line is not driven O National Instruments Corporation 4 3 SCXI 1140 User Manual Register Descriptions Bit 12 11 10 Name LEVEL EDGE HTRIGINEN HTRIGOUTEN TRIGIINEN TRIGIOUTEN CLKOUTEN SCXI 1140 User Manual Chapter 4 Description continued Level Sensitive Edge Triggered Mode Control If you clear this bit to zero the module is level sensitive and will be in Hold mode when the selected Hold Trigger signal is high and in Track mode when the selected Hold Trigger signal is low If you set the bit to one the module becomes edge sensitive and enters Hold mode on the rising edge of the selected Hold Trigger signal and enters Track mode after the number of SCANCON pulses determined by SCCNT lt 7 0 gt HOLDTRIG Input Enable Determines whether HOLDTRIG is selected as the Hold Trigger signal When you clear this bit to zero HOLDTRIG is the Hold Trigge
16. Connector The SCXI 1140 connects to the SCXIbus via a triple 4x6 metral receptacle Figure 3 3 shows the pin assignment for the SCXI 1140 SCXIbus connector O National Instruments Corporation 3 3 SCXI 1140 User Manual Theory of Operation V V CHSGND CHSGND V V 5 V SPICLK TRIGO SS Chapter 3 CHSGND CHSGND CHSGND CHSGND CHSGND RSVD INTR D A V V CHSGND CHSGND 5 V MOSI TRIGI SCANCON Figure 3 3 SCXI 1140 SCXIbus Connector Pin Assignment SCXI 1140 User Manual 3 4 O National Instruments Corporation Chapter 3 Theory of Operation SCXIbus Connector Signal Descriptions Pin B2 C2 Al BL CI D1 A2 B2 C2 D2 A3 B3 C3 D3 A5 B5 C5 D5 A4 D4 A6 D6 C13 C17 A21 B21 C21 D21 A13 C18 A19 B19 C19 D19 A20 B20 C20 D20 A22 B22 C22 D22 A23 D23 B23 C23 Signal Name ABO ABO GUARD CHSGND TRIG4 RSVD RESET MISO D A INTR V V 5 V SPICLK MOSI O National Instruments Corporation Description 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 Guard Shields guards the analog bus lines from noise Chassis Ground Digital and analog ground reference TRIG4 Reserved Open collector Reserved Reset When pul
17. EE 7 Rear Connector Ribbon Cable to Front Panel Figure E 3 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 4 Check the installation SCXI 1140 User Manual E 8 O National Instruments Corporation Appendix E SCXI 1140 Cabling 0666606266666 DOOOOOO 7 Front Panel Connector Be Ribbon Cable to Rear and Breakout Connectors NNNNNNNNNNNNNNNNNNNNNNS NNNNNNNNNNNNNNNNNNNNNNS O0Q00 DOOOOOO Step 5 Front Panel Front Threaded Strip Figure E 4 SCXI 1180 Front Panel Installation SCXI 1302 50 Pin Terminal Block The SCXI 1302 terminal block has screw terminal connections for the 50 pin connector on the SCXI 1180 feedthrough panel SCXI 1302 Wiring Procedure To wire the SCXI 1302 terminal block you must remove the cover connect all the wiring and replace the cover using the following procedure 1 Unscrew the rear grounding screw on the back of the terminal block as shown in Figure E 5 2 With a flathead screwdriver carefully pry the cover off the terminal block 3 Insert each wire through the terminal block strain relief O National Instruments Corporation E 9 SCXI 1140 User Manual SCXI 1140 Cabling Appendix E QV eM eom Connect the wires to the screw terminals Tighten the large strain relief screws to secure
18. RSVD Reserved 29 SLOTOSEL Slot 0 Select Taps into the SCXIbus INTR line to indicate whether the information on MOSI is being sent to a module or Slot 0 36 SCANCLK Scan Clock Indicates to the SCXI 1140 that a sample has been taken by the data acquisition board and causes the SCXI 1140 to change channels 37 SERCLK Serial Clock Taps into the SCXIbus SPICLK line to clock the data on the MOSI and MISO lines 39 TRACK HOLD Track Hold Can be programmed to reflect the state of the module low in Track mode or high in Hold mode TRACK HOLD can also be programmed to a high impedance output 46 HOLDTRIG HOLDTRIG You can program HOLDTRIG to input or output the Hold Trigger signal for the module You can use the Hold Trigger signal to place the module into Hold mode This signal is also brought out to the front connector All other pins are not connected See the Timing Requirements and Communication Protocol section later in this chapter for more detailed information on timing The signals on the rear signal connector can be classified as analog output signals digital I O signals or timing I O signals The following section contains signal connection guidelines for each of these groups Analog Output Signal Connections Pins 3 through 19 of the rear signal connector are analog output signal pins Pin 3 is the main output and pin 4 is its reference signal All eight channels are multiplexed onto this output under hardw
19. 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 Write only Word Size 16 bit Bit Map 15 14 13 12 11 10 9 8 7 6 gt 4 3 2 di 0 MODO CNT6 CNT5 CNT4 CNT3 CNT2 CNTI CNTO Bit Name Description 15 11 X Don t care bits Unused 10 7 MOD lt 3 0 gt 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 6 0 CNT lt 6 0 gt Count The value of these bits plus one determines how many samples are taken before the next scan list entry becomes active A value of zero corresponds to one sample and a value of 127 corresponds to 128 samples O National Instruments Corporation 4 9 SCXI 1140 User Manual Chapter 5 Programming This chapter contains a functional programming description of the SCXI 1140 and Slot 0 Note If you plan to use a programming software package such as NI DAQ LabWindows or LabVIEW with your SCXI 1140 module you do not need to read this chapter Programming Considerations This section contains programming instructions for operating the circuitry on the SCXI 1140 Programming the SCXI 1140 involves writing to the Configuration Register Programming Slot 0 involves writing to the HSCR and FIFO registers Programming the data acquisition boards involves writes to their registers See you
20. analog bus guard Position A C connects the module analog ground to pins 1 and 2 AIGND GUARD of the rear signal connector Use this position for all boards operating in RSE mode and for the Lab PC operating in NRSE mode Position B D connects the data acquisition board analog ground to the analog bus guard Position C D leaves the grounds disconnected and is the factory default setting SCXI 1140 User Manual 2 6 O National Instruments Corporation Chapter 2 Configuration and Installation Figure 2 2 Analog Jumpers Factory Setting Gain Selection You can use each DIP switch to set the gain of its channel as shown in Table 2 3 Table 2 3 Gain Switches for Each Channel Leaving all four switches in the open number side up position selects a gain of one as shown in Figure 2 3 This setting is the factory default Switch is shown in factory default gain 1 setting Figure 2 3 Gain Switches for Each Channel O National Instruments Corporation 2 7 SCXI 1140 User Manual Configuration and Installation Chapter 2 Closing switch A selects a gain of 500 Closing switch B selects a gain of 200 Closing switch C selects a gain of 100 Closing switch D selects a gain of 10 You can select other gains by closing more than one switch as shown in Table 2 4 Table 2 4 Switch Settings for Gain Selection Hardware Installation You can install the SCXI 1140 in any available SCXI chassis After you
21. and Installation 2 1 Module C onfre rattoli ioo cop esce tivo thos nn ban taeda yt ct nt ste bos aor vote pou n es 2 1 Digital Signal Connections sinus e teat tesa trae poe Y SERA C RE EXER SU ERR E REUS 2 3 Jumper WA pr TM 2 3 Jumper 1A ac 2 4 J mper dlc Er tene 2 4 Using Jumpers W13 and W14 eenonoronnvnrrnrvnerrrvnerrrvnenrrvernrrvsrnrrssnnrsvennnne 2 4 Anal g COM ucilvp E 2 6 Input Mode Selection sister tint see 2 6 Jumpers W1 through Who ns tse 2 6 Output Selection inutilement 2 6 Jumper c TN TE 2 6 Grounding and Shielding 5 eoe eter tensa aetate netus er oo Fon eh bos 2 6 Jumper WII ud ose ekke hate euet se e EE EE Er d a6 2 6 Gain Selecon sanitaire ts dod ese Petco ses ede 2 7 Hardware Installationen i o tette Saeed 2 8 Signal Connections is V genet ARTS ARN Le SEA CENE RR eR tnt ea VE RENT V DERE EN ES 2 9 The Front COMME CUON oii equ et odas t netus inte Pei cse ee nt ttes bus uo eoe RR Qe 2 9 Front Connector Signal Connection Descriptions eere 2 11 Analog Input Channels 5 59 m oreet ear Yet eo eS GU edu 2 11 Digital Input P 2 14 Terminal Block and Connector and Shell 2 15 Connector and Shell eue anetenn memes 2 15 Terminal EG Kessel ttc eet etti sch o REN E Hc t a eel Dis kel tuts 2 16 Cable Connection iet eate etse etre a as 2 16 The Rear Signal Connecter wi uis ode entente nine pi toe be Qe a tn ide dot pire nat 2 17 Rear Signal Connector Pin Descriptions 2 19 Ana
22. and it is not necessary to send the Hold Trigger signal to the data acquisition board that is connected to the other module the bits become 0000 e Ifthe Hold Trigger signal comes to the SCXI 1140 at its own front or rear signal connector and it is necessary to send the Hold Trigger signal to the data acquisition board that is connected to the other module the bits become 0001 4 Putthe SCXI 1140 into Hold mode 5 Measure the voltage with the data acquisition board Scanning Measurements Programming for scanned data acquisition involves programming your data acquisition board the modules and Slot 0 In general the steps to be taken are as follows 1 Perform all data acquisition board programming up 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 Only MIO boards can do channel scanning Lab NB Lab PC Lab PC Lab LC and PC LPM 16 boards cannot scan channels SCXI 1140 User Manual 5 6 O National Instruments Corporation Chapter 5 Programming 1 Data Acquisition Board Setup Programming Your data acquisition board user manual contains the programming steps for your data acquisition board Follow the instructions in the following sections AT MIO 16 User Manual Multiple A D Conversions with Interval Channel Scanning Pseudosimultaneo
23. as 0000 e If another module receives the Hold Trigger signal at its front or rear signal connector and it is not necessary to send the Hold Trigger signal to the data acquisition board or the SCXI 1140 program the four bits as 0000 e If another module receives the Hold Trigger signal at its front or rear signal connector and it is necessary to send the Hold Trigger signal to the data acquisition board program the four bits as 1110 e If another module receives the Hold Trigger signal at its front or rear signal connector and it is not necessary to send the Hold Trigger signal to the data acquisition board but the SCXI 1140 needs the signal program the four bits as 1010 O National Instruments Corporation 5 15 SCXI 1140 User Manual Programming Chapter 5 If you are not going to scan this module or if you are only using it as an interface write a zero to bit 2 SCANCONEN in the Configuration Register The start channel bits become don t care bits 3 Program the other modules to be used in the scan to connect their outputs to Analog Bus 0 but not to 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 1140 modules write the binary pattern SSSSSSSS XCCCXXXX XOUUDDDD 10100111 to their Configuration Registers Program the bits marked SSSSSSSS to 00000001 unless you want to acquire the same data from the SCXI 1140 several times Pro
24. binary 0000 1000 to the HSCR 4 Write binary 0010 1100 to the HSCR C 0 to the HSCR 5 Write binary 101S 11 Ca EY 6 Write binary 101 0 to the HSCR O National Instruments Corporation 5 17 SCXI 1140 User Manual Programming Chapter 5 7 Write binary 101S 1111 to the HSCR where S 0 if you want the scanning to repeat when the end of the list is reached or S I if you want the circuitry to shut down after a single scan When 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 To accomplish this select another slot or toggle the SLOTOSEL line to temporarily deassert the appropriate SS line If consecutive scan list entries access an SCXI 1140 the SCXI 1140 reloads the output multiplexer with the starting channel after each entry Thus two entries for one module with counts of four yields different behavior than one entry with a count of eight For multiple chassis scanning program each Slot 0 to have 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 4 Acquisition Enable Triggering and Servicing At this point you should now continue from where you left off in the Data Acquisition Board Setup Prog
25. bits appropriately D as follows O Program the four bits marked DD e Ifthe Hold Trigger signal comes from the other module via TRIGI the bits become 1010 Ifthe Hold Trigger signal comes to the SCXI 1140 front or rear signal connector and it is not necessary to send the Hold Trigger signal to the board that is connected to the other module the bits become 0000 Ifthe Hold Trigger signal comes to the SCXI 1140 front or rear signal connector and it is necessary to send the Hold Trigger signal the board that is connected to the other module the bits become 0001 SCXI 1140 User Manual 5 14 O National Instruments Corporation Chapter 5 Programming Multiple Module Multiplexed Scanning To scan multiple modules you must cable one module to a data acquisition board and the module must be capable of transferring Analog Bus 0 to the data acquisition board This module must also be capable of sending a SCANCLK compatible signal on TRIGO If any of the modules being scanned need a Hold Trigger signal then this module must also be able to send a HOLDTRIG compatible signal on TRIG1 See Chapter 2 Configuration and Installation for more information The module programming steps are as follows l Perform any necessary programming to ensure that no modules are driving Analog Bus 0 For an SCXI 1140 clearing the ABOEN bit in the Configuration Register ensures that its output is not driving ABO Program the module
26. board 1 Write FF02 to the Am9513 Command Register to select Counter 2 Mode Register 2 Write 0004 to the Am9513 Data Register to select High Impedance mode O National Instruments Corporation 5 11 SCXI 1140 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 second method of operation can be quite useful especially when the data acquisition board scan list length is limited to 16 entries The AT MIO 16F 5 AT MIO 16X and AT MIO 64F 5 boards can have up to 512 entries Because many SCXI 1140s in one chassis can be multiplexed to one MIO 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 of 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 FF01 to the Am9513 Command Register to selec
27. disconnect the HOLDTRIG pin on the SCXI 1140 rear signal connector to the OUTBI pin of the Lab board If you want to source the HOLDTRIG signal from the data acquisition board place the jumper in position A the factory default setting If you want to source the HOLDTRIG signal externally place the jumper in position B as shown in Figure E 2 SCXI 1140 User Manual E 4 O National Instruments Corporation Appendix E SCXI 1140 Cabling Position A Position B HOLDTRIG Disconnected HOLDTRIG Connected Figure E 2 Jumper W1 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 turned off Configure jumper W1 Install the SCXI module in the chassis Be cede Connect one end of the ribbon cable to the adapter board rear connector This is the 50 pin connector of the SCXI 1344 cable 5 Plug the adapter board front connector to the module rear signal connector A corner of the adapter board will enter the upper board guide of the chassis 6 Screw the rear panel to the threaded strips in the rear of the chassis 7 For an SCXI 1341 connect the loose end of the ribbon cable to the Lab board 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 1
28. have made any necessary changes and have verified and recorded the jumper and DIP switch settings a form is included for this purpose in Appendix G Customer Communication you are ready to install the SCXI 1140 The following are general installation instructions but consult the user manual of your SCXI chassis for specific instructions and warnings 1 Turn off the computer that contains the data acquisition board 2 Turn off the SCXI chassis Do not insert the SCXI 1140 into a chassis that is turned on 3 Insert the SCXI 1140 into the board 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 must be firmly engaged however do not force the module into place 4 Screw the front mounting panel of the SCXI 1140 to the top and bottom threaded strips of your SCXI chassis SCXI 1140 User Manual 2 8 O National Instruments Corporation Chapter 2 Configuration and Installation 5 If you are going to connect this module 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 1140 module Screw the rear panel to the rear threaded strip Attach the loose end of the cable to the MIO 16 board Notes If you already have another module in your chassis that is cabled to your data acquisition board you ge
29. increase loading of the source possibly resulting in gain error Figures 2 7 through 2 9 illustrate how to connect AC coupled signals SCXI 1140 User Manual 2 12 O National Instruments Corporation Chapter 2 Configuration and Installation SCXI 1140 SCXI 1140 SCXI 1140 Figure 2 9 Floating AC Coupled Signal Connection O National Instruments Corporation 2 13 SCXI 1140 User Manual Configuration and Installation Chapter 2 The SCXI 1140 instrumentation amplifiers can reject any voltage within their common mode input range caused by ground potential differences between the signal source and the module In addition the amplifiers can reject common mode noise pickup in the leads connecting the signal sources to the SCXI 1140 module However you should be careful to minimize noise pickup The common mode rejection of the instrumentation amplifiers decreases significantly at high frequencies The amplifiers do not reject normal mode noise The common mode input range of the SCXI 1140 instrumentation amplifiers is defined as the magnitude of the greatest common mode signal that can be rejected Thus the common mode input range for the SCXI 1140 depends on the gain and size of the differential input signal Vait V in Vin The exact formula for the permissible common mode input range is as follows Vem allowed 12 V G IVqiggl 2 Thus with a differential voltage of 10 V and a gain of G 1 the maximum possible common mode
30. male ribbon cable header The manufacturer part number of the header National Instruments uses is as follows e AMP Inc part number 1 103310 0 The mating connector for the SCXI 1140 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 1140 Recommended manufacturer part numbers for this mating connector are as follows Electronic Products Division 3M part number 3425 7650 e T amp B Ansley Corporation part number 609 5041CE Part numbers of standard 50 conductor 28 AWG stranded ribbon cables that work with these connectors are as follows Electronic Products Division 3M part number 3365 50 e T amp B Ansley Corporation part number 171 50 The SCXI 1140 front connector is a 96 pin DIN C male connector Recommended manufacturer part numbers for this connector are as follows Harting Electronik Inc part number 09 03 396 6921 e Panduit Corporation part number 100 096 033 The mating connector for the SCXI 1140 front connector is a 96 pin DIN C female connector The recommended manufacturer part number for this mating connector is as follows e AMP Inc part number 535020 1 right angle pins e Panduit Corporation part number 100 096 434 straight solder eyelet pins Unpacking Your SCXI 1140 module is shipped in an antistatic package to prevent electrostatic damage
31. of the ribbon cable to the rear connector of the second SCXI 1350 and install the adapter board Continue until all of the 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 1140 The SCXI 1343 has screw terminals for the analog output connections and solder pads for the rest of the signals A strain relief is on the outside of the rear panel Table E 4 SCXI 1343 Pin Connections Rear Signal SCXI 1140 Use Connection Type Connector Pin AGND GUARD Solder pad AGND GUARD Screw terminal OUTPUT Screw terminal OUTREF Screw terminal OUTI Screw terminal OUTREF Screw terminal OUT2 Screw terminal OUTREF Screw terminal OUT3 Screw terminal OUTREF Screw terminal OUT4 Screw terminal OUTREF Screw terminal OUTS5 Screw terminal continues SCXI 1140 User Manual E 12 National Instruments Corporation Appendix E SCXI 1140 Cabling Table E 4 SCXI 1343 Pin Connections Continued Rear Signal SCXI 1140 Use Connection Type Connector Pin OUTREF OUT6 OUTREF OUT7 OUTREF AGND NC No Connect No Connect No Connect No Connect DIG GND SERDATIN SERDATOUT DAQD A No Connect SLOTOSEL No Connect No Connect No Connect No Connect No Connect SCANCLK SERCLK Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Screw terminal Solder pad S
32. some channels are read more often than others You cannot change the start channel in the module Configuration Register during a scan Either the data acquisition board or the front connector can supply the HOLDTRIG signal SCXI 1000 or SCXI 1001 Chassis SCANCON X E Data Acquisition Board SLOTX Cable M Assembly Eight DEM CANCLK ES Channel Timing Output Differential pr gt Hold Timing I O Inputs Oo OUTPUT Z Analog Input Figure 3 8 Single Module Multiplexed Scanning Direct O National Instruments Corporation 3 13 SCXI 1140 User Manual Theory of Operation Chapter 3 Single Module Multiplexed Scanning Indirect In this mode you do not cable the SCXI 1140 directly to the data acquisition board Instead you cable another module to the data acquisition board and the analog output of the SCXI 1140 is sent over Analog Bus 0 through the intermediate module and then to the data acquisition board The output multiplexer clock is received from TRIGO having been sent there by the intermediate module as shown in Figure 3 9 Either the data acquisition board or the front connector can supply the HOLDTRIG signal The HOLDTRIG signal is bused on TRIGI of the SCXIbus Slot 0 operation is the same as in the direct connection case SCXI 1000 or SCXI 1001 Chassis SCANCON X Data Acquisition Board Cable Assembly He Channel Timing Output HOLDTRIG p Hold Timing I O OUTPUT Analog Input SLOT 0 Figure 3 9 S
33. the SCXI 1140 wraps around to Channel 0 V Follow the steps given in the section 3 Programming the Slot O Hardscan Circuitry earlier in this chapter in which the step Write the Slot O scan list to the FIFO consists of the following steps a Write 00000000 00000 samples O 11 to the FIFO Register This corresponds to Slot 1 for four b Write 000000 seven samples OD C C C co 10 to the FIFO Register This corresponds to Slot 4 for c Write 00000001 0000 samples C 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 a b and c Follow the procedure given in the Acquisition Enable Triggering and Servicing section earlier in this chapter O National Instruments Corporation 5 19 SCXI 1140 User Manual Programming Chapter 5 Example 2b This example is similar to Example 2a with the exception that the Hold Trigger signal is supplied at the front signal connector of module 2 and must be sent to the MIO 16 board Notice that you cannot do this with an NB MIO 16 board The Configuration Register writes given in the programming steps 2 through 5 in example 2a become changes are underlined 2 00000000 00000000 00000001 00000000 to Slot 2 3 00000001 00000000 00011110 10100111 to Slot 4 4 00000001 00100000 00011010 01100111 to Slot I
34. 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 50 Pin Thumbscrew Connector Cutout Insert Screwdriver in Groove and Rotate to Pry Open Figure E 5 Cover Removal SCXI 1302 Installation Follow these steps to install the SCXI 1302 1 2 Install an SCXI 1180 feedthrough panel as described in the SCXI 1180 Installation section Wire the terminal block as described in the previous section SCX1 1302 Wiring Procedure Connect the SCXI 1302 terminal block to the front panel connector on the SCXI 1180 feedthrough panel Be careful to fit the thumbscrews into the thumbscrew cutouts Tighten the top and bottom captive screws on the back of the terminal block into the screw holes in the front panel to hold the SCXI 1302 securely in place Check the installation SCXI 1140 User Manual E 10 O National Instruments Corporation Appendix E SCXI 1140 Cabling 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 a male breakout connector 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 provides a male breakout connector on the ribbon cable to suppor
35. to the module Several components on the board can be damaged by electrostatic discharge To avoid such damage in handling the module take the following precautions Touch the package to a metal part of your SCXI chassis before removing the module from the package Remove the module from the package and inspect it for loose components 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 1140 User Manual 1 4 O National Instruments Corporation Chapter 2 Configuration and Installation This chapter describes the SCXI 1140 jumper configurations DIP switch settings installation of the SCXI 1140 into the SCXI chassis signal connections to the SCXI 1140 and cable wiring Module Configuration The SCXI 1140 includes 14 jumpers and eight DIP switches that are shown in the parts locator diagram in Figure 2 1 O National Instruments Corporation 2 1 SCXI 1140 User Manual Chapter 2 Configuration and Installation z oe rz 23 Izon 0583 22903 oa xo 0593 e my 3 a a 3 o 3 c TES S Q c 3 DE 03 3 c 22 3 a Hu 3 o cr on o 220 OS o a a 65 SS a zx E Sz te 222 2 pr ea SOR zzz olg BE UAN OUPO 00 R oax jii anos 20 v Nx A sgag o g i De oh 238 849 ages ze ae p zm a 2 I Clo a PIE o PN r gt szg Be 239 PE o 33 zb
36. to the Am9513A Command Register to clear the Counter 2 output low Write FF22 hex to the Am9513A Command Register to arm Counter 2 2 Program the Sample Interval Counter substitute this section for the one in Chapter 4 of the NB MIO 16 User Manual a Write FF03 hex to the Am9513A Command Register to select Counter 3 Mode Register SCXI 1140 User Manual 5 10 O National Instruments Corporation Chapter 5 Programming b Write the mode value to the Am9513 Data Register to store the Counter 3 mode value Use one of the following hex mode values 4B25 Selects the 1 MHz clock 4C25 Selects the 100 kHz clock 4D25 Selects the 10 kHz clock 4E25 Selects the 1 kHz clock 4F25 Selects the 100 Hz clock 4525 Selects signal at SOURCES input as it clocks the rising edge of the signal 6 MHz maximum Be sure to use the same clock source as the Scan Interval Counter c Write FFOB hex to the Am9513A Command Register to select Counter 3 Load Register d Write the desired sample interval minus one to the Am95134A Data Register to store the Counter 3 load value The sample interval must be between 2 and 1 0000 hex 65 536 decimal e Write FF64 hex to the Am9513A Command Register to load and arm Counter 3 f Write the desired sample interval to the Am9513A Data Register to store the Counter 3 load value e If the sample interval is between 2 and FFFF hex 65 535 decimal write the sample interval to the Am9513A Da
37. voltage would be 7 V The same range would apply for a differential input of 100 mV and a gain of 100 The range increases to 12 V for zero differential input voltage The actual common mode voltage available at the input is measured with respect to the SCXI 1140 ground and can be calculated by the following formula V cm actual V in Vin y 2 where V is the signal at the positive input INO through IN7 and Vin is the signal at the corresponding negative input INO through IN7 Both V and Vin are measured with respect to the SCXI 1140 chassis ground Warning Exceeding the differential and common mode input ranges results in distorted input signals Exceeding the maximum input voltage rating can result in damage to the SCXI 1140 module the SCXIbus and the data acquisition board National Instruments is not liable for any damages resulting from such signal connections Digital Input The HOLDTRIG pin on the front signal connector is identical in function to the HOLDTRIG pin on the rear signal connector The two are wired together internally through about 200 Q of protection resistance For this reason you should be careful to ensure that the signal is not simultaneously driven from both connectors For further information on this signal see the Digital I O Signal Connections and Timing Requirements and Communication Protocol sections for the rear signal connector later in this chapter The signal should be in the 0 to 5 V rang
38. 1140 Signal Conditioning Module O National Instruments Corporation F 1 SCXI 1140 User Manual Revision A and B Photograph and Parts Locator Diagram Appendix F Grounding Screw Rear Signal Connector SCXIbus Connector W10 ves gp un 5 HeT203 JUS meters weriss p wenis v Su 33 n us Cm I uy for WM Om DD Ou E07 CHERE jg U12 U19 and Revision Letter 9 ES 242 E 6 E t 9o aa Assembly Number R27 R28 R30 R31 he 4 5 W6 2 4 Connector R2 and Shell R2 Mounting R25 Thumbscrew Thumbscrew Terminal Block Mounting Hole Terminal Block Mounting Hole Figure F 2 Revision A and B SCXI 1140 Parts Locator Diagram SCXI 1140 User Manual F 2 O National Instruments Corporation Appendix G Customer Communication For your convenience this appendix contains forms to help you gather the information necessary to help us solve technical problems you might have as well as a form you can use to comment on the product documentation Filling out a copy of the Technical Support Form before contacting National Instruments helps us help you better and faster National Instruments provides comprehensive technical assistance around the world In the U S 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 79
39. 1140 via Another Module To perform measurements via another module you must cable the rear signal connector of the other module to a data acquisition board and the module must be capable of transferring Analog Bus 0 to the data acquisition board The other module must also have the ability to route the Hold Trigger signal unless it will be connected to the front of the SCXI 1140 and is not needed by the data acquisition board See Chapter 2 Configuration and Installation for more information O National Instruments Corporation 5 7 SCXI 1140 User Manual Programming Chapter 5 To measure one of the eight differential input channels to the SCXI 1140 perform the following actions 1 Perform any necessary programming to ensure that no modules are driving Analog Bus 0 For an SCXI 1140 clearing ABOEN in the Configuration Register ensures that its output is not driving ABO 2 Program the other module to connect Analog Bus 0 to the data acquisition board but not to drive the connection You must also program the module to appropriately handle the routing of the Hold Trigger signal C 3 Write the binary pattern XXXXXXXX XCCCXXXX XOUUDDDD 00000010 to the SCXI 1140 Configuration Register Program the four bits marked DDDD as follows e Ifthe Hold Trigger signal comes from the other module via TRIGI the bits become 0010 e Ifthe Hold Trigger signal comes to the SCXI 1140 at its own front or rear signal connector
40. 1180 feedthrough panel the SCXI 1343 rear screw terminal adapter or the SCXI 1351 one slot cable extender with the SCXI 1140 you should read this section Figure 2 11 shows the pin assignments for the SCXI 1140 rear signal connector O National Instruments Corporation 2 17 SCXI 1140 User Manual Configuration and Installation SCXI 1140 User Manual SERDATIN DAQD A SLOTOSEL DIG GND SERCLK TRACK HOLD RSVD 11 13 15 17 19 21 23 25 27 29 31 33 12 14 16 18 20 22 24 26 28 30 32 Figure 2 11 SCXI 1140 Rear Signal Connector Pin Assignment 2 18 Chapter 2 AGND GUARD OUTPUT REF AGND AGND AGND AGND AGND AGND AGND DIG GND SERDATOUT SCANCLK HOLDTRIG O National Instruments Corporation Chapter 2 Configuration and Installation Rear Signal Connector Pin Descriptions Pin 1 2 5 7 9 11 13 15 17 6 8 10 12 14 16 18 19 24 33 25 26 Signal Name AGND GUARD OUTPUT OUTPUT REF AOUT I through AOUT7 AGND AGND NC DIG GND SERDATIN SERDATOUT O National Instruments Corporation Description Analog Ground Guard Connected to the module analog ground when jumper W 12 is in position A C or to the SCXIbus analog bus guard when the jumper is in position A B Otherwise leave unconnected These pins connect to the analog ground of the MIO data acquisition boards Output Main module analog output In Scan mode the outp
41. 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 adapter board rear connector The adapter board converts the signals from the Lab board I O connectors to a format compatible with the SCXI 1140 rear signal connector pinout at O National Instruments Corporation E 3 SCXI 1140 User Manual SCXI 1140 Cabling Appendix E the front connector of the SCXI 1341 or SCXI 1344 The adapter board also has an additional male breakout connector that provides the unmodified Lab board signals for use with an SCXI 1180 feedthrough panel or SCXI 1181 breadboard module The adapter board allows the Lab boards full access to the digital control lines but does not allow the Lab boards to scan channels only to take single measurements Table E 2 lists the SCXI 1341 and SCXI 1344 pin translations Table E 2 SCXI 1341 Pin Translations Lab Board Pin Lab Board Signal SCXI 1140 Pin SCXI 1140 Signal ACHO OUTPUT ACHI OUTI ACH2 OUT2 ACH3 OUT3 ACHA OUTA ACH5 OUTS ACH6 OUT6 ACH7 OUT7 AIGND AGND GUARD DACOOUT No Connect AOGND No Connect DACIOUT No Connect DGND DIG GND PB4 SERDATIN PB5 DAQD A PB6 SLOTOSEL PB7 SERCLK PB1 SERDATOUT PB2 No Connect EXTCONV SCANCLK OUTBI HOLDTRIG 5 V No Connect VOIQNGGSBQNPN All other pins of the Lab board pinout are not sent to the SCXI 1140 rear signal connector Jumper W1 on the adapter board is used to connect or
42. 2 17 to 2 29 analog output signal connections 2 20 to 2 21 digital I O signal connections 2 21 to 2 22 digital input signals 2 21 digital output signals 2 21 digital timing signals 2 22 SCXIbus to SCXI 1140 pin equivalences 2 22 3 6 O National Instruments Corporation Index specifications and ratings for digital I O and timing lines 2 22 pin assignments 2 18 B 1 pin descriptions 2 19 to 2 20 B 2 to B 3 SCXI 1140 and MIO 16 pin equivalences E 2 SCXI 1140 pin equivalences 5 2 SCXIbus connector signal descriptions 3 5 to 3 6 timing signals 2 23 to 2 24 Edge Triggered Mode HOLDTRIG source 2 23 to 2 24 TRIG1 source 2 25 HOLDTRIG timing requirements 2 23 Level Sensitive mode HOLDTRIG source 2 24 TRIG1 source 2 24 SCANCLK timing requirements 2 23 warning against exceeding maximum ratings 2 9 single channel measurements direct measurements multiplexed output 5 6 parallel output 5 6 indirect measurements measurements from other modules 5 7 measurements from SCXI 1140 via another module 5 7 to 5 8 overview 5 4 putting SCXI 1140 into Track or Hold mode 5 4 to 5 5 Lab NB Lab PC Lab PC Lab LC 5 5 MIO 16 5 4 PC LPM 16 5 5 single module multiplexed scanning direct scanning 3 13 indirect scanning 3 14 single module parallel scanning 3 12 SL lt 3 0 gt bit 4 7 Slot 0 programming Slog 0 hardscan circuitry 5 17 writing the 16 bit slot select number 2 25 Slot 0 Register FIFO Register 4 9
43. 342 PC LPM 16 Cable Assembly The SCXI 1342 PC LPM 16 cable assembly connects a PC LPM 16 board to a SCXI 1140 module The 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 1140 rear signal connector pinout The adapter board also has an additional male breakout connector that provides the unmodified signals of the PC LPM 16 for use with an SCXI 1180 feedthrough panel or SCXI 1181 breadboard module The adapter board gives the PC LPM 16 full access to the digital control lines but does not allow the PC LPM 16 to scan channels only to take single measurements Table E 3 lists the SCXI 1342 pin translations O National Instruments Corporation E 5 SCXI 1140 User Manual SCXI 1140 Cabling Appendix E Table E 3 SCXI 1342 Pin Translations PC LPM 16 Pin PC LPM 16 Signal Rear Signal SCXI 1140 Use Connector Pin AGND GUARD OUTPUT OUTPUT REF OUTI OUTPUT REF OUT2 OUTPUT REF OUT3 OUTPUT REF OUT4 OUTPUT REF OUT5 OUTPUT REF OUT6 OUTPUT REF OUT7 OUTPUT REF DIG GND SERDATOUT No Connect SERDATIN DAQD A SLOTOSEL SERCLK OUT2 No Connect All other pins of the PC LPM 16 pinout are not sent to the SCXI 1140 rear signal connector Use jumper W1 on the adapter board to connect or disconnect the HOLDTRIG pin on the SCXI 1140 rear signal
44. 4 Position A B connects the SCXIbus MISO line after buffering to the SERDATOUT pin of the rear signal connector When jumper W 14 is in Position A B and jumper W 13 is properly set the data acquisition board can read the Module ID Register of the SCXI 1140 See the Timing Requirements and Communication Protocol section later in this chapter and Chapter 5 Programming for information on reading the Module ID Register See Appendix E SCXI 1140 Cabling for the SCXI 1140 rear signal connector and the data acquisition board I O connector pin equivalences Position B C disconnects SERDATOUT from the SCXIbus MISO line Jumper W13 On Revision A and B modules jumper W13 should not be connected On Revision C or later modules position A B connects a 2 2k pullup resistor to the SERDATOUT line Position B C does not connect the pullup resistor to the SERDATOUT line Using Jumpers W13 and W14 If the SCXI 1140 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 A B If the SCXI 1140 is cabled to a data acquisition board and the SCXI chassis that the SCXI 1140 is in is the only SCXI chassis cabled to that data acquisition board leave the jumpers in their factory default positions both in position A B If the SCXI 1140 is cabled to a data acquisition board and there are multiple SCXI chassis cabled to that data acquisition board with sh
45. 4 1 Module ID Reiser gemene ee fan 4 2 Configuration Register sement e e Tess orsa spe ikea Pe pea sane T Ue PEDE E Sd 4 3 Slot 0 Register Descriptions spissere renis a ins nee Met 4 6 Slot Select ReBISIeE ous aee AD avis nece epe Sa Uie lads dedo vv aee ede ent 4 7 Hardscan Control RE SISter sunne Gina ne ques e ace eut Oc oU et eta hutee 4 8 FIFO Register m 4 9 Chapter 5 Prosranmmine vn eh esis teased psa a he easton earl iets 5 1 Programming Considerations si hee diete ske Se eine Had vr dedu e za idoneas dads 5 1 porum c P 5 1 Rens Ves see 5 1 Register Selection and Write Procedure eese 5 2 PI A ZA sie tee ere Degree 5 3 Trackesand Hold Modes santa faste pactis diua de 5 3 Level Sensitive Hold Terie Ber uoto tero e sb bis tres 5 3 Edge Sensitive Hold Trigger e pente tt dec treno s 5 4 Single Channel Measurements iiec nn mare 5 4 Putting the SCXI 1140 into Track or Hold Mode 5 4 Using an MIO 16 Board a cscs Jess doin tete ive iter tcc en 5 4 Using a Lab NB Lab PC Lab PC or Lab LC Board 5 5 Using a PC LPM 16 Board 5 5 Direct Measurements 23 2 1 e i ii dee tede utes 5 6 Parallel COLE SSSR u i e eee 5 6 Multplexed Owtput 5o noce dee itd Quiet a naa 5 6 Indirect Measuremehbls oue eee Sco ossi dee kee Reda 5 7 Measurements from Other Modules sess 5 7 Measurements from the SCXI 1140 via Another Module 5 7 SCXI 1140 User Manual vi O Nati
46. 5 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 O National Instruments Corporation G 1 Fax Number 03 879 9179 0662 437010 19 02 757 03 11 45 76 71 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 1140 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 from their user manuals Include additional pages if necessary Name Company Address Fax Phone ___ Processor Computer brand Model Operating system Speed MHz RAM MB Mouse yes no Hard disk capacity M Instruments used National Instruments
47. 7 CLKEN 4 9 CLKOUTEN 4 4 CLKSELECT 4 5 CNT lt 6 0 gt 4 9 FOUTEN 4 5 FRT 4 8 HSRS 4 8 HTRIGINEN 4 4 HTRIGOUTEN 4 4 LEVEL EDGE 4 4 LOAD 4 8 MOD lt 3 0 gt 4 9 ONCE 4 8 RD 4 8 RSVD 4 3 4 8 SCANCLKEN 4 5 SCANCONEN 4 5 4 8 SCANEN 4 5 SCCT lt 7 0 gt 4 3 SL lt 3 0 gt 4 7 TRACK HOLDEN 4 4 TRIG1INEN 4 4 TRIGIOUTEN 4 4 X don t care 4 3 4 7 4 9 board configuration See configuration C cables and cabling cable connection for terminal block 2 16 custom cables 1 4 SCXI 1180 feedthrough panel E 7 to E 9 SCXI 1302 50 pin terminal block E 9 to E 10 SCXI 1340 cable assembly E 1 to E 3 SCXI 1341 Lab NB Lab PC Lab PC cable assembly E 3 to E 5 SCXI 1342 PC LPM 16 adapter board E 5 to E 7 SCXI 1140 User Manual Index SCXI 1343 rear screw terminal adapter E 12 to E 14 SCXI 1344 Lab LC cable assembly E 3 to E 5 SCXI 1350 multichassis adapter E 11 to E 12 SCXI 1351 one slot cable extender E 11 calibration procedures hardware calibration calibration component identification 6 3 calibration procedure 6 3 to 6 4 complicating factors 6 3 when to calibrate 6 2 software calibration gain adjustment 6 1 to 6 2 linearity adjustment 6 2 offset adjustment 6 1 CHAN lt 2 0 gt bit 4 3 channel scanning See scanning measurements CHS lt 4 0 gt bit 4 7 CHSGND signal 3 5 C 3 CLKEN bit 4 8 CLKOUTEN bit 4 4 CLKSELECT bit 4 5 CNT lt 6 0 gt bit 4 9 common m
48. Also program the appropriate Hold Trigger routing if necessary Channel Scanning from the SCXI 1140 via Another Module To scan the SCXI 1140 via another module you must cable the other module to a data acquisition board and the module must be capable of transferring Analog Bus 0 to the board The other module must also be capable of sending a SCANCLK compatible signal on TRIGO and a HOLDTRIG compatible signal on TRIGI 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 1140 clearing the ABOEN bit in the Configuration Register ensures that its output is not driving ABO 2 Program the other module to connect Analog Bus 0 to the data acquisition board but not drive Analog Bus 0 Program the other module to send a SCANCLK compatible signal onto TRIGO Also program the module to appropriately handle the routing of the Hold Trigger signal 3 Write the binary pattern SSSSSSSS XCCCXXXX XOUUDDDD 01100111 to the SCXI 1140 Configuration Register Program the bits marked SSSSSSSS to 00000001 unless you want to acquire the same data from the SCXI 1140 several times CCC is the starting channel number Program the bits marked UU to 10 when you use an NB MIO 16 board and 01 when you use any other MIO 16 board If you are using your own data acquisition scheme program these
49. CLK 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 pulses EXTSTROBE low and then high accomplishing steps 3b and 3c 4 Set SLOTOSEL to 1 which asserts 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 is selected When no communication is 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 zero this indicates data will be written to the Configuration Register If you are writing to the HSCR or FIFO Register leave DAQD A high SCXI 1140 User Manual 5 2 O National Instruments Corporation Chapter 5 Programming 6 Foreach bit to be written to the Configuration Register a Establish the desired SERDATIN level corresponding to this bit b Clear SERCLK to O c Set SERCLK to 1 clock the data If you are using an MIO 16 board writing to the EXTSTROBE register pulses EXTSTROBE low and then high accomplishing steps 6b and 6c 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 If you are not select
50. CXI 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 The bracket is especially useful when the SCXI chassis is rack mounted making rear access difficult The SCXI 1340 has an extra male breakout connector that you can use with the SCXI 1180 feedthrough panel or with additional modules or breadboards that need a direct connection to the MIO 16 board The SCXI 1340 rear panel gives the module and chassis both mechanical and electrical shielding O National Instruments Corporation E 1 SCXI 1140 User Manual SCXI 1140 Cabling Appendix E Table E 1 lists the pin equivalences of the MIO 16 board and the SCXI 1140 Table E 1 SCXI 1140 and MIO 16 Board Pinout Equivalences SCXI 1140 Rear Signal MIO 16 Equivalent Connector AGND GUARD AIGND OUTPUT ACHO OUTPUT REF ACHS8 AOUTI ACHI OUTPUT REF ACH9 AOUT2 ACH2 OUTPUT REF ACHIO AOUT3 ACH3 OUTPUT REF ACHII AOUT4 ACH4 OUTPUT REF ACHI2 AOUT5 ACHS5 OUTPUT REF ACHI3 AOUT6 ACH6 OUTPUT REF ACH14 AOUT7 ACH7 OUTPUT REF ACH15 AGND NC DIG GND SERDATIN SERDATOUT DAQD A SLOTOSEL SCANCLK SERCLK TRACK HOLD RSVD HOLDTRIG No other pins are connected on the SCXI 1140 AISENSE DIG GND ADIOO BDIOO ADIOI ADIO2 SCANCLK EXTSTROBE EXTGATE OUTI OUT2 SCXI 1340 Installation Follow these steps to install the SCXI 1340 1 Make sure that the computer and
51. Clocks the serial data on the MOSI and MISO lines Open collector I O C23 MOSI Master Out Slave In Transmits data from the SCXI 1140 User Manual SCXIbus to the module Open collector I O C 2 O National Instruments Corporation Appendix C Pin Signal Name TRIGO A24 B24 SS C24 SCANCON D24 TRIGI All other pins are not connected SCXIbus Connector Description continued TRIGO General purpose trigger line used by the SCXI 1140 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 Each module in a chassis receives a separate SCANCON Totem pole Input TRIG1 Can be used to synchronize several SCXI 1140s in the same chassis by forcing them to go into Hold mode at the same time Open collector I O Further information is given in Chapter 3 Theory of Operation O National Instruments Corporation C 3 SCXI 1140 User Manual Appendix D SCXI 1140 Front Connector This appendix describes the pinout and signal names for the SCXI 1140 front connector including a description of each connection Figure D 1 shows the pin assignments for the SCXI 1140 front connector O National Instruments Corporation D 1 SCXI 1140 User Manual SCXI 1140 Front Connector Appendix D Pin Signal Column
52. EE EE A 2 EN DD ODE EE EEE EE A 2 POWEL a un ne Tee cn a ae ne Ts A 2 PHYSICAL RM ON A 3 Op raume Fi ronmenLusuusgvagatorn tersamisk teneste A 3 Storage Environmental mien nettes rentes A 3 Appendix B Rear Signal Connector o oe eoe deuten iD AU etes de B 1 Rear Signal Connector Pm Descriptions M teen B 2 Appendix C SCXIDus Connector RS C 1 SCXIbus Connector Signal Descriptions ss C 3 Appendix D SCXI 1140 Front Connectors D 1 Front Connector Signal Connection Descriptions 00 0 0 ee eeeeeseeeeseecneeceeeeseeesneeesaeenes D 3 Appendix E SCXISIAO0 CaDIng ee E 1 SCXI 1540 Cable Assembly tt teeth rh en eoo etos e qr Sae et ove e HE aces serende E 1 SC 11590 Installation ee E 2 O National Instruments Corporation vii SCXI 1140 User Manual Contents SCXI 1341 Lab NB Lab PC or Lab PC Cable Assembly and SCXI 1344 Lab LC Cable Assembly i aee ies iones enrich eh Rt eere ene eR nier tant E 3 SCXI 1341 or SCXI 1344 Installation eene E 5 SCXI 1342 PC LPM 16 Cable Assembly aoreet nr ees eto whe eo eae se nae een eon E 5 SCXI 1342 Installations testis dte treten norton o aene a nee e vere edi xor aes cusses E 6 SCAXI DT80 beedthrougDeoPabel ei fe decirte Y tise E MUERE be tut E 7 SCXI 1180 Installation seit titii erneuten Do eere eere ob Ree tante E 7 SCXI I302 50 Pim Terminal BIO sc ses esse toe be ee Ene Ser ivo ala ia E 9 SCXI 1302 Wiring Procedute e re eese segeanse
53. MIO 16 board and 01 when you use any other MIO 16 board If you are using your own data acquisition scheme program these bits appropriately Single Module Multiplexed Scanning Direct To perform simple channel scanning cable the SCXI 1140 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 SSSSSSSS XCCCXXXX XOUU0000 00100101 to the SCXI 1140 Configuration Register Program the bits marked UU to 10 when you use an NB MIO 16 board and 01 when you use any other MIO 16 board If you are using your own data acquisition scheme program these bits appropriately Program the bits marked SSSSSSSS to 00000001 unless you want to acquire the same data from the SCXI 1140 several times Single Module Multiplexed Scanning Indirect Channel Scanning from Other Modules To scan measurements from other modules you must cable the SCXI 1140 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 1140 clearing the ABOEN bit in the Configuration Register ensures that its output is not driving ABO 2 Write the binary pattern XXXXXXXX XXXXXXXX XOUUDDDD 10000011 to the SCXI 1140 Configuration Register This step causes ABO to drive the OUTPUT p
54. RIGI line from or to the HOLDTRIG rear signal connector pin Single Module Parallel Scanning Single Module Parallel Scanning is the simplest scanning mode Cable the SCXI 1140 directly to the data acquisition board as shown in Figure 3 7 each analog signal has its own channel Either the data acquisition board or the front connector can supply the HOLDTRIG signal If you configure the Hold Trigger in Edge Triggered mode the module must send SCANCLK over TRIGO to Slot 0 and count the pulses of the SCANCON signal to determine when to go back into Track mode SCXI 1140 User Manual 3 12 O National Instruments Corporation Chapter 3 Theory of Operation SCXI 1000 or SCXI 1001 Chassis Data Acquisition Board Hold Timing Output Eight Differential Inputs Figure 3 7 Single Module Parallel Scanning Single Module Multiplexed Scanning Single Module Multiplexed Scanning Direct Direct Single Module Multiplexed Scanning is the simplest multiplexed scanning mode Cable the SCXI 1140 directly 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 except during changes from one Slot 0 scan list entry to the next when SCANCON pulses high to make the output multiplexer reload its starting channel Although you are only using a single module you can put many entries in the Slot 0 FIFO with different counts so that
55. SCXI 1140 User Manual An Eight Channel Simultaneously Sampling Differential Amplifier Module for Signal Conditioning September 1994 Edition Part Number 320410B 01 O Copyright 1991 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 1140 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 b
56. Signal Number Name A B C Name HOLDTRIG 45V D A t A I oo oO o o o o o O o O o o o o o o o o o o O o o o o o o o O o o o o o Figure D 1 SCXI 1140 Front Connector Pin Assignment SCXI 1140 User Manual D 2 O National Instruments Corporation Appendix D SCXI 1140 Front Connector Front Connector Signal Connection Descriptions Pin A32 A30 A26 A24 A20 A18 A14 A12 C32 C30 C26 C24 C20 C18 C14 C12 A28 A22 A16 C28 C22 C16 A6 A2 C6 A8 C8 A4 Signal Name INO to IN7 INO to IN7 AGND HOLDTRIG DGND 5V Description Positive Input Channels Connect to the noninverting inputs of the instrumentation amplifier of each channel Negative Input Channels Connect to the inverting inputs of the instrumentation amplifier of each channel Analog Ground Connect to the module analog ground HOLDTRIG Can be programmed to input or output the Hold Trigger signal for the module The Hold Trigger signal can place the module into Hold mode This signal is also brought out to the rear signal connector Digital Ground Connect to the module digital ground Digital Five Volts For test purposes only should not be loaded by more than 25 mA Only on Rev C and later modules Detailed signal specifications are included in Chapter 2 Configuration and Installation O National Instruments Corporation SCXI 1140 User Manual
57. UTPUT pin through a buffer ABO to directly drive the OUTPUTREF pin and prevents the SCXI 1140 from driving the analog bus Program the four bits marked DDDD as follows So If the other module needs the Hold Trigger signal and it comes from the data acquisition board or will be connected to the HOLDTRIG pin on the front connector of the SCXI 1140 the bits become 0001 This setting makes the SCXI 1140 receive the Hold Trigger signal from the HOLDTRIG pin front or rear and sends an inverted Hold Trigger signal on the SCXIbus TRIGI line If the other module receives the Hold Trigger signal at its front or rear signal connector and it is not necessary to send the Hold Trigger signal to the data acquisition board the bits become 0000 If the other module receives the Hold Trigger signal at its own front or rear signal connector and it is necessary to send the Hold Trigger signal to the data acquisition board the bits become 1110 This setting makes the SCXI 1140 send the Hold Trigger signal that it receives from the TRIG1 SCXIbus line If the other module does not need a Hold Trigger signal these are don t care bits XXXX 3 Program the other module to drive Analog Bus 0 with the signal to be measured and program the appropriate Hold Trigger routing if necessary 4 If necessary put the other module into Hold mode 5 Measure the voltage with the data acquisition board Measurements from the SCXI
58. XI 1140 Module ID Register Timing Diagram eese 2 29 SCXI 1140 Block Dagmar 3 2 SCXI 1140 Digital Interface Circuitry Block Diagram 3 3 SCXI 1140 SCXIbus Connector Pin Assignment eere 3 4 SCXI 1140 Timing Control Circuitry Block Diagram 3 7 SCXI 1140 Track and Hold Control uccisi oett tito rots 3 9 SCXI LI40 Analog CITCUIIEy 5 5 nace Qaod poit kennelen 3 10 St gle Module Parallel Scanning 40 Rides 3 13 Single Module Multiplexed Scanning Direct esses 3 13 Single Module Multiplexed Scanning Indirect sss 3 14 Multiple Module Multiplexed Scanning eene 3 15 Multiple Ch ssis Scanner tin ieee 3 15 SCXI 1140 Rear Signal Connector Pin Assignment eese B 1 SCXI 1140 SCXIbus Connector Pin Assignment eene C 2 SCXI 1140 Front Connector Pin Assignment eene D 2 SCXI T340 Installation soga E 3 Jumper dem v P n m E 5 SCXI 1180 Rear Connections aiti touto teet estaria tese dt erede tara E 8 SCXI 1180 Front Panel Installation ss sant uses ose ecu E 9 Cover Removal sed SR dt deae de s E 10 Revision A and B SCXI 1140 Signal Conditioning Module F 1 Revision A and B SCXI 1140 Parts Locator Diagram esee F 2 SCXI 1140 User Manual Content
59. a acquisition boards unless otherwise noted Lowercase text in 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 AT and compatible computers SCXIbus refers to the backplane in the chassis A signal on the backplane is referred to as the SCXIbus signal name line or signal The SCXIbus descriptor may be omitted when the meaning is clear Descriptions of all SCXIbus signals are given in Appendix C SCXIbus Connector Slot 0 refers to the power supply and control circuitry in the SCXI chassis xii O National Instruments Corporation About This Manual 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 AT MIO 16 User Manual part number 320476 01 e AT MIO 16D User Manual part number 320489 01 e AT MIO I6F 5 User Manual part number 320266 01 e AT MIO 16X User Manual part number 320488 01 e AT MIO 64F 5 User Manual part number 320487 01 e Lab LC User Manual par
60. able control The warranty provided 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 LabVIEWS NI DAQS 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 m
61. always directly available at the rear signal connector Multiplexed mode facilitates multimodule operation and uses fewer data acquisition board channels This mode however requires more care with regard to programming and timing The local SCANCLK signal increments the output multiplexer provided you have set the SCAN bit in the Configuration Register There is no local SCANCLK if SCANCLKEN is set so you should clear SCANCLKEN This is the power up condition The local SCANCLK will be either SCANCLK from the rear signal connector or TRIGO from the SCXIbus connector depending on the state of the CLKSELECT bit in the Configuration Register TRIGO may be driven with the local SCANCLK if SCANCLKEN is coming from the rear signal connector and if the CLKOUTEN bit in the Configuration Register is set Using TRIGO several modules in one chassis can access SCANCLK from only one rear signal connector You can reload the output multiplexer by one of the following events At power up or board reset e Assertion of the SCXIbus SS signal that is any access to the module Ahighlevel on SCANCON on the SCXIbus connector if you set the SCANCONEN bit in the Configuration Register The output multiplexer will be reloaded to the channel specified by CHAN lt 2 0 gt in the Configuration Register The module output is enabled if either the FOUTEN bit in the Configuration Register is cleared or SCANCON on the SCXIbus connector is low Each module in a c
62. an SCXI 1340 SCXI 1341 SCXI 1342 or SCXI 1351 in the adjacent slot The breakout connector further extends the cabling scheme The front panel connector has 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 The SCXI 1180 should be installed to the right of a slot that has an SCXI 1340 SCXI 1341 or SCXI 1342 cable assembly or an SCXI 1351 slot extender in its rear connector space Follow these steps to install the SCXI 1180 1 Make sure that the computer and the SCXI chassis are turned off 2 Remove the front filler panel of the slot where you want to insert the SCXI 1180 3 Thread the rear connector through the front of the chassis to the rear of the chassis Attach the rear connector to the breakout connector of the adjacent cable assembly or slot extender as shown in Figure E 3 O National Instruments Corporation E 7 SCXI 1140 User Manual SCXI 1140 Cabling Appendix E Threaded Strip in Rear of Chassis O SCXI 1180 Breakout Connector N O O O N NNNNNNNN SSSSS NN CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC O ANANN N Breakout Connector from SCXI 1340 ARETE EERE RAE AERDURGEARUGRDADADRDU E
63. ant byte first Within each byte data is sent out MSB first Additional data transfers result in all zeros being sent on the MISO line The Module ID Register is reinitialized to its original value each time the SCXI 1140 is deselected by the SS signal on the backplane The SCXI 1140 Module ID is eight Type Read only Word Size Four byte Bit Map SCXI 1140 User Manual 4 2 O National Instruments Corporation Chapter 4 Register Descriptions Configuration Register The Configuration Register contains 32 bits that control the functions of the SCXI 1140 When SS is asserted low and D A indicates data low the register shifts in the data present on the MOSI line bit 31 first and then latches the data when the SCXI 1140 is deselected by the SS signal on the backplane The Configuration Register initializes to all zeros when you first turn on or reset the SCXI chassis Type Write only Word Size 32 bit Bit Map 31 30 29 28 27 26 25 24 SCCTS 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 ee DER TRE 7 6 5 4 3 2 1 0 CLKOUTEN CLKSELECT SCANEN RSVD SCANCLKEN SCANCONEN ABOEN FOUTEN Bit Name Description 31 24 SCCT lt 7 0 gt Scan Control Count Indicates how many SCANCON pulses 1 to 256 the module should count before returning to Track mode Zero corresponds to 256 Scan Control Count is significant only when the module is in Edge Triggered mode 23 19 15 X Don t care bits Unused 22 20 CHAN lt 2 0 gt
64. are control in Scan mode In Nonscanning mode the output simply becomes the output of one selected channel Channel 0 is the power up and reset default When scanning multiple modules you can also connect this output to the SCXIbus analog bus and the analog bus will drive this output Pins 5 7 9 11 13 15 and 17 are direct outputs from channels 1 through 7 respectively Thus if you program pin 3 to monitor the Channel 0 output all eight channels are available simultaneously at the connector Pins 6 8 10 12 14 16 and 18 are the reference signals for outputs 1 through 7 If possible you should use differential connections to measure SCXI 1140 User Manual 2 20 O National Instruments Corporation Chapter 2 Configuration and Installation the outputs If your data acquisition board uses single ended inputs connect the ground or the negative input for NRSE mode of the data acquisition board to pin 19 and set jumper W9 to position B C so that pin 19 connects to the module analog ground Warning The SCXI 1140 analog outputs are not overvoltage protected although they are short circuit protected Applying external voltage to these outputs may result in damage to the SCXI 1140 National Instruments is not liable for any damages resulting from such signal connections Digital I O Signal Connections Pins 24 through 27 29 33 36 through 39 43 and 46 constitute the digital I O lines of the rear signal connector These pins belong to on
65. ata 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 SCXI 1140 User Manual 1 2 O National Instruments Corporation Chapter 1 Introduction Optional Equipment Equipment Part Number NB6 cable 0 5m 181305 01 1 0m 181305 10 SCXI 1301 sample and hold terminal block 776573 01 SCXI 1310 96 pin connector and shell 776573 10 SCXI 1340 cable assembly 776574 40 SCXI 1341 Lab NB Lab PC Lab PC cable assembly 776574 41 SCXI 1342 PC LPM 16 cable assembly 776574 42 SCXI 1343 rear screw terminal adapter 776574 43 SCXI 1344 Lab LC cable assembly 776574 44 SCXI 1346 shielded multichassis cable adapter 776574 46 SCXI 1347 SCXI shielded cable assembly with 1 m cable 776574 471 with 2 m cable 776574 472 with 5 m cable 776574 475 with 10 m cable 776574 470 SCXI 1349 SCXI shielded cable assembly with 1 m cable 776574 491 with 2 m cable 776574 492 with 5 m cable 776574 495 with 10 m cable 776574 490 SCXI 1350 multichassis adapter 776575 50 Standard ribbon cable 0 5 m 180524 05 1 0m 180524 10 Refer to the Signal Connections section in Chapter 2 and Appendix E SCXI 1140 Cabling for additional information on cabling connectors and adapters O National Instruments Corporation 1 3 SCXI 1140 User Manual Introduction Chapter 1 Custom Cables The SCXI 1140 rear signal connector is a 50 pin
66. ating on the Serial Peripheral Interface SPI bus and their timing requirements The communication signals are SERDATIN DAQD A SLOTOSEL SERDATOUT and SERCLK Furthermore Slot 0 produces SS according to data acquisition board programming therefore its timing relationships with the communication signals are also discussed For information on the Slot Select Register in Slot 0 consult Chapter 5 Programming 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 You also write a slot select number to program the Slot 0 hardscan circuitry See Chapter 5 Programming for information on programming the Slot 0 hardscan circuitry Use the following procedure for selecting a slot in a particular chassis Figure 2 18 illustrates the timing of this procedure with the example of selecting Slot 11 in Chassis 9 Notice that the factory default chassis address for the SCXI 1001 is address 0 For information on changing the address of your chassis consult the SCXI 1000 1001 User Manual An SCXI 1000 chassis responds to any chassis number To write the 16 bit slot select number to Slot 0 follow these steps 1 Initial conditions SERDATIN dont care DAQD A z don t care SLOTOSEL 1 SERCLK 1 2 Clear SLOTOSEL to 0 to deassert all SS lines to all modules in all chassis
67. ature 0 to 50 C Relative humidity 596 to 9096 noncondensing Storage Environment Temperature 55 to 150 C Relative humidity 596 to 9096 noncondensing O National Instruments Corporation A 3 SCXI 1140 User Manual Appendix B Rear Signal Connector This appendix describes the pinout and signal names for the SCXI 1140 50 pin rear signal connector including a description of each connection Figure B 1 shows the pin assignments for the SCXI 1140 rear signal connector SERDATIN DAQD A SLOTOSEL DIG GND SERCLK TRACK HOLD RSVD AGND GU ARD OUTPUT REF AGND AGND AGND AGND AGND AGND AGND DIG GND SERDATOUT SCANCLK HOLDTRIG Figure B 1 SCXI 1140 Rear Signal Connector Pin Assignment O National Instruments Corporation SCXI 1140 User Manual Rear Signal Connector Appendix B Rear Signal Connector Pin Descriptions Pin 1 2 5 7 9 11 13 15 17 6 8 10 12 14 16 18 19 24 33 25 26 Signal Name AGND GUARD OUTPUT OUTPUT REF AOUT I through AOUT7 AGND AGND NC DIG GND SERDATIN SERDATOUT SCXI 1140 User Manual Description Analog Ground Guard Connected to the module analog ground when jumper W 12 is in position A C or to the SCXIbus analog bus guard when the jumper is in position A B Otherwise leave unconnected These pins connect to the analog ground of the MIO data acquisition boards Output Main module analog output
68. connector to or from the OUT2 pin of the PC LPM 16 If you want to source the HOLDTRIG signal from the data acquisition board place the jumper in position A which is the factory default If you want to source the HOLDTRIG signal externally place the jumper in position B as shown in Figure E 2 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 Configure jumper W1 4 Connect the one end of the ribbon cable to the adapter board rear connector SCXI 1140 User Manual E 6 O National Instruments Corporation Appendix E SCXI 1140 Cabling 5 Plug the adapter board front connector onto the module rear signal connector A corner of the adapter board will enter the upper board guide of the chassis 6 Screw the rear panel to the threaded strips in the rear of the chassis 7 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 has 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 The rear connector attaches to the male breakout connector of
69. ct Timing Diagram Figure 2 19 shows the timing requirements on the SERCLK and SERDATIN signals These requirements must be observed for all communications Tdelay is a SCXI 1140 specification Thigh EE ILU oM l l Tsetup Thold SERDATIN KKK KKK KKK Ze NOOOOOOOOOCZ PRESSE Mr SOS SS SQ Tdelay SERDATOUT gt d Tlow Minimum low time 65 nsec minimum Thigh Minimum high time 400 nsec minimum Tsetup SERDATIN setup time 200 nsec minimum Thold SERDATIN hold time 200 nsec minimum Tdelay SERDATOUT delay 350 nsec maximum Figure 2 19 Serial Data Timing Diagram After the Slot Select line to an SCXI 1140 has been asserted you can write to its Configuration Register and read its Module ID Register by using the protocols of the following After the 32 bits of data are read from the Module ID Register further data will be zeros until reinitialization occurs Deassert Slot Select to reinitialize the contents of the Module ID Register O National Instruments Corporation 2 27 SCXI 1140 User Manual Configuration and Installation Chapter 2 To write to the Configuration Register follow these steps 1 Initial conditions SS asserted low SERDATIN don care DAQD A 0 indicates data will be written to the Configuration Register SLOTOSEL z 1 SERCLK I and has not changed since SS went low 2 Foreach bit starting with the MSB perform the following action a Set SERDATIN bit to be sent These bits are the data that is b
70. d Shell Terminal Block The terminal block consists of a shielded board with supports to connect to the SCXI 1140 front signal connector There are twenty screw terminals for easy connection Eight pairs of screw terminals are dedicated for signal connection to the eight differential inputs of the SCXI 1140 two screw terminals connect to AGND and one pair of screw terminals connects to the HOLDTRIG digital signal and DGND Cable Connection To connect wire pairs to the terminal block use the following procedure 1 Remove the rear grounding screw on the edge of the rear panel of the terminal block 2 Snap out the top cover of the shield by placing a screwdriver in the groove at the bottom of the terminal block 3 Slide the wires one at a time through the front panel strain relief SCXI 1140 User Manual 2 16 National Instruments Corporation Chapter 2 Configuration and Installation Connect the wires to the screw terminals Tighten the strain relief QV eM eom Snap the top cover back in place 7 Reinsert the rear grounding screw 8 Connect the terminal block to the SCXI 1140 front connector and tighten the top and bottom screws on the back of the terminal block to hold it securely in place The Rear Signal Connector Note If you will be using the SCXI 1140 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
71. de deaceastadee ss ansoqatanentactoness E 9 SCXTST202 Install allo ne tn Tes Aden E 10 SCXI 1351 One Slot Cable Extender esie itte IIa ensa so sodedadeavasacadendeceensons E 11 SE 35 ll Installation ares core tdeo tero ton emule Rennais tie ta E 11 Multiple chassis Connections for the SCXI 1140 VU E 11 SC XI 1350 Multichassis Adapter occi tete ue to aree eH earl dv REUS E 11 SCXI 1350 Installation 1 eet sence e reete era tenens E 12 SCXI I343 Rear Screw Terminal Adapter 4 etes tes tette pe tone eco pore Sere talents E 12 SCXI 1343 Installation tecti nepote teen eon Ede t SR ben es cadogananuaenetounes E 14 Appendix F Revision A and B Photograph and Parts Locator Diagram F 1 Appendix G Customer Communication G 1 GOSS BEY eh eh Pas food nn tank se Glossary 1 liio qc m E P tod Index 1 SCXI 1140 User Manual viii O National Instruments Corporation Figure 1 1 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 9 Figure 2 10 Figure 2 11 Figure 2 12 Figure 2 13 Figure 2 14 Figure 2 15 Figure 2 16 Figure 2 17 Figure 2 18 Figure 2 19 Figure 2 20 Figure 2 21 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 9 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 E 5 Figur
72. droop rate of about 10 mV sec which means that the output of the track and hold amplifier changes about 10 mV for every second that the amplifier is in Hold mode If the data acquisition board you use has a throughput of 50 KHz a 10 V input range and 12 bit resolution theoretically you could scan up to 5 000 channels with only half an LSB of error introduced by the track and hold amplifiers The present practical limit on channel count using an MIO 16 board is determined by the following calculation 8 channels module x 12 modules chassis x 8 chassis data acquisition board 768 channels data acquisition board The output of every channel is connected to a multiplexer whose output connects through switches and a buffer to the rear signal connector The multiplexer control is described in the Multiplexer Addressing section earlier in this chapter The analog switches connect the multiplexed module output to and from the SCXIbus analog bus Use these switches when multiplexing the outputs of several modules In this case all the module ABO switches are closed while the output multiplexers of all of the modules except the one being read are disabled Refer to Chapter 5 Programming for more information on how to program and configure multiple modules When you set the multiplexer to Channel 0 and disable the analog bus the outputs of all eight channels are simultaneously available on the rear signal connector This configuration is useful in stand a
73. dule is in Track mode Level Sensitive mode is the power up and reset condition The source of the Hold Trigger signal is software selectable and can either be the HOLDTRIG signal from the front or rear signal connector or the inverse of TRIGI from the SCXIbus connector The Hold Trigger signal can be sent out by the HOLDTRIG pins of the signal connectors or onto TRIG1 in inverted form The HOLDTRIG and TRIGI I O select circuitry powers up and resets so that HOLDTRIG is selected as an input and no other signal is selected as an output Hardware prevents both signals from being selected as inputs and either signal being both input and output TRACK HOLD which connects to the rear signal connector and TRIG4 which connects to the SCXIbus connector power up and reset in the disabled state You can enable TRACK HOLD and TRIGA as a replica of the HOLD signal which directly controls the track and hold circuits in the analog section The SCANCON counter whose activity is relevant only in Edge Triggered mode counts the number of SCANCON pulses All modules being scanned enter Hold mode on the rising edge of their Hold Trigger signals all of which should be the same After the designated number of SCANCON pulses for a module the module goes back into Track mode For most applications the count value of the SCANCON counter should be one O National Instruments Corporation 3 9 SCXI 1140 User Manual Theory of Operation Chapter 3 Analog Circui
74. e with switching occurring around 1 5 V Although HOLDTRIG is a digital signal it is still susceptible to noise particularly at its transitions If you configure the SCXI 1140 to be level sensitive noise at the HOLDTRIG signal transitions is not particularly important In Edge Sensitive mode however noise can cause the module to enter Hold mode on the wrong edge Two possible transition noise sources are interference and reflection You can minimize interference by properly shielding the incoming trigger signal You can minimize reflection by ensuring that the trigger signal source is impedance matched to the cable used to transmit the signal You can frequently accomplish impedance matching by inserting a small resistor about 50 Q in series with the signal source SCXI 1140 User Manual 2 14 O National Instruments Corporation Chapter 2 Configuration and Installation However the best way to ensure that the HOLDTRIG signal is not corrupted by noise is to minimize the distance that the signal must travel Terminal Block and Connector and Shell There are two types of connectors to connect the signals to the SCXI 1140 inputs The first is a 96 pin DIN C female connector and its shell The second is a terminal block with screw terminals for easy connection These kits are listed in the Optional Equipment section in Chapter 1 Introduction Connector and Shell The SCXI 1310 front connector and shell are available in a kit The connector
75. e F 1 Figure F 2 O National Instruments Corporation ix Contents Figures SCXI 1140 Signal Conditioning Module eene 1 1 SCXI TT40 Parts Locator Dita craic sieben erronee tet ood satin een tuae aes 2 2 Analog Jumpers Factory Setting iiiter rectitudine Shee 2 7 Gain Switches Tor Each Channel 5e ie ann die setts 2 7 SCXI 1140 Front Connector Pin Assignment eene 2 10 Ground Referenced Signal Connection 2 12 Floating Signal Connections aces oye eee dde ieee eee dade 2 12 Ground Referenced AC Coupled Signal Connection sss 2 13 Ground Offset AC Coupled Signal Connection 2 13 Floating AC Coupled Signal Connection 2 13 Assembling and Mounting the Connector and Shell 2 16 SCXI 1140 Rear Signal Connector Pin Assignment eese 2 18 SCANCLK Timing Requirements e tace colette ni ie Cold du get ocean 2 23 HOLDTRIG Timing Requireme nts 48 nn in oe iret ardens 2 23 Level Sensitive Mode HOLDTRIG Source eee 2 24 Level Sensitive Mode TRIGI Source eese 2 24 Edge Triggered Mode HOLDTRIG Source 2 25 Edge Triggered Mode TRIG Source or ieee 2 25 Slot Select Timing Pagani nt trie 2 27 Serial Data Timing Dia ranm s ie ne de nn die nid rein 2 27 Configuration Register Write Timing Diagram eee 2 28 SC
76. e 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 own 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 there is only one Slot Select Register in a system composed of multiple chassis The HSCR and FIFO Register on the other hand are unique to each chassis and must be programmed separately SCXI 1140 User Manual 4 6 O National Instruments Corporation Chapter 4 Register Descriptions Slot Select Register The Slot Select Register contains 16 bits that determine which module in which chassis is enabled for communication when the SLOTOSEL line is high An SCXI 1000 chassis selects the appropriate module in its chassis regardless of the chassis number written The Slot Select Register shifts 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 l 0 CHS3 CHS2 CHSI CHSO Bit Name Description 15 9 X Don t care bits Unused 8 4 CHS lt 4 0 gt Chassis Bit 4 through 0 Determine which chassis is selected On the SCXI 1000 chassis the
77. e of three categories digital input signals digital output signals and timing signals Pins 24 and 33 are the digital ground reference for all the data acquisition board digital signals and are tied to the module digital ground The digital input signals are pins 25 27 29 and 37 The data acquisition board uses these pins to configure the SCXI module when the module is under data acquisition control Each digital line emulates the SCXIbus communication signals as follows e 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 Pin 27 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 Pin 29 indicates whether the data on the SERDATIN line is being sent to Slot 0 SLOTOSEL 0 or to a module SLOTOSEL 1 Jumper W11 must be in position A B 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 The digital output signal is pin 26 e Pin 26 is SERDATOUT and is equivalent to SCXIbus MISO when jumper W14 is in position A B The digital I O signals of the SCXI 1140 match the digital I O lines of the MIO 16 When you use the SCXI 1140 with an SCXI 1341 or an SCXI 1342 cable assembly the SCXI 1140 signals match
78. e same time Open collector I O 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 you are using the module 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 Table 3 1 shows the signal connections from the rear signal connector to the backplane 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 W11 must be set to position A B SERCLK SPICLK SERDATOUT MISO Jumper W14 must be set to position A B In order for the data acquisition board to talk to a slot the board must first assert the SS for that slot You do this 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 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 protocol SCXI 1140 User Manual 3 6 O National Instruments Corporation Chapter 3 Theory of Operation Digital Control Circuitry The digital control section consists of the Configuration Reg
79. ear signal connector On Revision C and later modules jumper W13 connects a pullup resistor to the SERDATOUT signal on the rear signal connector The module also includes eight four position DIP switches that you use to set the gains of the eight channels The DIP switches are shown in the parts locator diagram Figure 2 1 as U12 through U19 Further configuration of the module is software controlled and is discussed in Chapter 5 Programming Digital Signal Connections The SCXI 1140 has three jumpers dedicated for communication between the data acquisition board and the SCXIbus These jumpers are W11 W13 and W14 Jumper W11 On Revision A and B modules position A B connects SLOTOSEL to the SCXIbus INTR line after buffering This is the factory default setting and you should not change it 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 using the INTR line See Appendix E SCXI 1140 Cabling for pin equivalences of the SCXI 1140 rear signal connector and the data acquisition board I O connector O National Instruments Corporation 2 3 SCXI 1140 User Manual Configuration and Installation Chapter 2 Position B C is reserved and you should not use it On Revision C or later modules jumper W11 does not exist SLOTOSEL is always buffered to the INTR line Jumper W1
80. ed Output Enable When cleared to zero causes the OUTPUT pin on the rear signal connector to be driven by the selected channel through the output buffer and the OUTPUTREF pin to be tied to local analog ground If FOUTEN is set to one the selected channel on the module does not drive the output buffer unless SCANCON is active low and the SCANCONEN bit is cleared If the module is driving the output buffer it also drives Analog Bus 0 if ABOEN is set If nothing is driving the output buffer the SCXI 1140 output saturates 4 5 SCXI 1140 User Manual Register Descriptions Chapter 4 Slot 0 Register Descriptions Slot 0 has three registers the Slot Select Register the FIFO Register and the Hardscan Control Register The Slot Select Register is a 16 bit write only register that determines with which slot the data acquisition board speaks 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 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 for setting up the timing circuitry in Slot 0 Use the SLOTOSEL line to write to the Slot Select Register Write to the HSCR and the FIFO Register as if they were registers located on modules in slots 13 and 14 It is recommended that you maintain software copies of th
81. ed the board The initialization routine described in your board user manual puts the OUT2 pin into the high impedance state If you change the function of OUT2 to be driven by the MIO board and then want to change back to the high impedance state so you can drive the HOLDTRIG pin on the front connector of the SCXI 1140 without suffering driver contention perform the following steps 1 Write FF02 to the Am9513 Command Register to select Counter 2 Mode Register 2 Write 0004 to the Am9513 Data Register to select High Impedance mode To control Track and Hold modes from the MIO board establish OUT2 HOLDTRIG low before programming your module 1 Write FFE2 to the Am9513 Command Register to clear TC Toggle Output of Counter 2 2 Write FF02 to the Am9513 Command Register to select Counter 2 Mode Register 3 Write 0002 to the Am9513 Data Register to select TC Toggle mode HOLDTRIG should now be low Check it on the HOLDTRIG pin of the front signal connector Now program your modules for single measurements Notice that you can use either Level Sensitive or Edge Triggered mode for the Hold Trigger signal Put the module or modules into Hold mode Write FFEA to the Am9513 Command Register to Set TC Toggle Output of Counter 2 From now on alternate between the Set TC Toggle Output and the Clear TC Toggle Output commands to go between Hold and Track modes If you are using edge sensitive triggering you SCXI 1140 User Manual 5 4 O Nat
82. edical or clinical treatment must be performed by properly trained and qualified medical personnel and all traditional medical safeguards equipment and procedures that are appropriate in the particular situation to prevent serious injury or death should always continue to be used when National Instruments products are being used 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 About This Manual This manual describes the electrical and mechanical aspects of the SCXI 1140 and contains information concerning its operation and programming The SCXI 1140 is a member of the National Instruments Signal Conditioning eXtensions for Instrumentation SCXI Series modules for National Instruments data acquisition plug in boards This module is designed for low cost signal conditioning of a wide variety of high level and low level DC and AC voltage sources This manual also describes the installation basic programming considerations and theory of operation for the SCXI 1140 Organization of This Manual The SCXI 1140 User Manual is organized as follows Chapter 1 ntroduction describes the SCXI 1140 lists the contents of your SCXI 1140 kit describes the optional software optional equipment and custom cables and explains how to unpack the SCXI 1140 kit Chapter 2 Configuration and I
83. eing written to the Configuration Register b Clear SERCLK 0 c Set SERCLK 1 This rising edge clocks the data If you are using an MIO 16 a write to the EXTSTROBE Register causes EXTSTROBE to pulse low thus accomplishing steps b and c 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 another slot will not be selected it is recommended that you write zero to the Slot 0 Slot Select Register Figure 2 20 illustrates a write to the SCXI 1140 Configuration Register of the binary pattern 00000001 01010000 00010001 10100111 SLOTOSEL N SS SERDATIN o000000hofifofilo 000 0 0 ofifo 0 of 1 1o 10 of1 1 1 Figure 2 20 Configuration Register Write Timing Diagram SCXI 1140 User Manual 2 28 O National Instruments Corporation Chapter 2 Configuration and Installation 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 I and has not changed since SS went low 2 For each bit to be read a Clear SERCLK 0 b Set SERCLK 1 Clock the data If you are using an MIO 16 board a write to the EXTSTROBE Register will cause EXTSTROBE to pulse low thus accomplishing steps b and c c Read the level of the SERDATOUT line
84. el AC and DC signal sources The SCXI 1140 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 1140 but they cannot scan the module these boards can only perform single channel reads You can control the SCXI 1140 with either the data acquisition board or the SCXIbus Slot 0 controller Each SCXI 1140 module can multiplex its channels into a single data acquisition board channel although separate outputs are available as well You can multiplex several SCXI 1140s into a single channel thus greatly increasing the number of analog input signals that can be digitized An additional shielded terminal block has screw terminals for easy signal attachment to the SCXI 1140 In addition to the analog input signal terminals there is a terminal for a digital input signal that you can use to place the module into Hold mode and thus initiate a data acquisition sequence You can use the SCXI 1140 in a wide range of applications ranging from thermocouple and low level DC measurement to phase measurement With the SCXI 1140 the SCXI chassis can serve as a fast scanning signal conditioner for laboratory testing production testing and industrial process monitoring A 50 pin male ribbon connector at the rear of the module connects the module to the MIO 16 boards The Lab boards and the PC LPM 16 require special adapters At the front a 96
85. g The Configuration Register the FIFO Register the and HSCR are write only registers O National Instruments Corporation 5 1 SCXI 1140 User Manual Programming Chapter 5 The different bits in these registers often control independent pieces of circuitry Sometimes 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 affects 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 software copy to determine the register status 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 Table 5 1 SCXI 1140 Rear Signal Connector Pin Equivalences SCXIbus Line SCXI 1140 Rear MIO 16 Lab Boards PC LPM 16 Signal Connector SERDATIN DAQD A SLOTOSEL SERCLK SERDATOUT Register Selection and Write Procedure Select the slot of the module to be written to or Slot 13 or 14 Initial conditions SERDATIN X DAQD A X SLOTOSEL I SERCLK I 2 Clear SLOTOSEL to 0 This deasserts all SS lines to all modules in all chassis 3 For each bit starting with the MSB bit 15 do the following a Set SERDATIN bit to be sent These bits are the data being written to the Slot Select Register b Clear SER
86. g sections Offset Adjustment Offset adjustment requires that you apply an input signal of zero to the channel to be calibrated Zero input can mean shorting the module inputs to zero or it can mean applying zero excitation to the transducer being used In the former case you can remove only module and data acquisition board offset in the latter case transducer offset is removed as well In either case measurements are taken with the zero input signal Average these measurements to reduce uncertainty This average represents the offset Next subtract the offset from all subsequent measurements Notice that offset changes with gain thus during calibration the channel should be set to the gain at which the subsequent measurements will be taken Gain Adjustment Gain adjustment requires you to apply two different input signals rather than one as for offset adjustment One of the two points is typically zero because zero is easy to generate with a high degree of accuracy The other should be near full scale either a DC voltage from a precision calibrator or a voltage generated by application of a known excitation to the transducer being used Of course you should generate both signals zero and full scale from the same source O National Instruments Corporation 6 1 SCXI 1140 User Manual Calibration Procedures Chapter 6 Take measurements on both signals and compute separate averages Then combine the averages with the known input sig
87. gh 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 1140 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 LabWindows is on high density 5 25 in and 3 5 in diskettes You can use the SCXI 1140 together with the NB Series data acquisition boards with LabVIEW for Macintosh 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 You can also use the SCXI 1140 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 d
88. gram the bits marked UU to 10 when you use an NB MIO 16 board and 01 when you use any other MIO 16 board If you are using your own data acquisition scheme program these bits appropriately Program the four bits marked DDD as follows e Ifthe Hold Trigger signal comes from another module via TRIGI program the four bits as 0010 Ifthe Hold Trigger signal comes to the SCXI 1140 at its front or rear signal connector and it is not necessary to send the Hold Trigger signal to the data acquisition board or to another module program the four bits as 0000 e Ifthe Hold Trigger signal comes to the SCXI 1140 at its front or rear connector and it is necessary to send the Hold Trigger to the data acquisition board or to another module program the four bits as 0001 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 Data Acquisition Board Setup Programming section earlier in this chapter You can use the MIO 16 boards with the SCXI 1350 multichassis adapter for multichassis scanning For each chassis program the modules according to the appropr
89. hardware product model Configuration National Instruments software product Configuration The problem is List any error messages The following steps will reproduce the problem Display adapter Other adapters installed Brand Revision Version SCXI 1140 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 1140 Revision Letter Chassis Slot Module Grounding Factory Setting W12 parking position A C Output Grounding Factory Setting W9 parking position A B Input Grounding Factory Setting A B Channel CERNA ARAE AERENCA A L w EE pg up Other Modules in System 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 1140 User Manual Edition Date September 1994 Part Number 320410B 01 Please comment on the completeness clarity and organization of the manual If yo
90. has eyelet ends for easy hook and soldering of wires With this kit you can build your own cable to connect to the SCXI 1140 inputs After you build the cable the shell covers and protects the connector Follow the steps included in your connector and shell kit to assemble the shell After you have built the shell mount the connector and shell to your SCXI module in the following steps Turn off your computer or disconnect it from your SCXI chassis Turn off your SCXI chassis Slide the module of interest out of the SCXI chassis Refer to Figure 2 10 Assembling and Mounting the Connector and Shell Remove the module cover OM uS uxo 18 cS Place one jack screw as indicated in Figure 2 10 7 While holding the 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 8 Tighten the nut by firmly holding it and rotating the jack screw 9 Repeat steps 6 through 8 for the second jack screw 10 Place the module cover back in place and tighten the grounding screw 11 Slide the module back in place 12 Connect the connector and shell to your module connector and hold the connector and shell in place by tightening both mounting screws O National Instruments Corporation 2 15 SCXI 1140 User Manual Configuration and Installation Chapter 2 mounting screw GJ R r lock washers nut Figure 2 10 Assembling and Mounting the Connector an
91. hassis receives a separate SCANCON each of which is under the control of Slot 0 Set the ABOEN bit in the Configuration Registers of all the modules involved to perform multimodule scanning This configuration connects all of the multiplexed module outputs in parallel through the SCXIbus backplane Slot 0 then asserts the SCANCON of each module independently to select one module at a time during scanning For more information on multiplexer addressing see the Scanning Modes section later in this chapter and Chapter 5 Programming SCXI 1140 User Manual 3 6 O National Instruments Corporation Chapter 3 Theory of Operation Track and Hold Control Circuitry Figure 3 5 illustrates the SCXI 1140 track and hold control circuitry Each block is described in the following paragraphs HOLDTRIG Ege HOLD MSS Output Select Enables TRACK HOLD TRIG4 SCANCON Counter SCANCON Figure 3 5 SCXI 1140 Track and Hold Control The two primary modes of operation of the track and hold control circuitry are Edge Triggered mode and Level Sensitive mode In Edge Triggered mode the module is placed into Hold mode on the rising edge of the Hold Trigger signal The module is placed back into Track mode when the SCANCON counter has counted down to zero In Level Sensitive mode the Hold Trigger signal becomes the HOLD signal for the module when the selected Hold Trigger signal is high the module is in Hold mode and when it is low the mo
92. he SCXI 1140 output is enabled In Multiplexed or Parallel mode when the Hold Trigger signal is in Edge Triggered mode the SCANCON signal is also counted on the module to determine when to go back into Track mode Slot 0 contains a module scan list first in first out FIFO memory chip The memory chip is similar to the Channel and Gain FIFO on an MIO 16 board except that instead of having a channel number and gain setting for each entry the scan list contains a slot number and a sample count for each entry The list in Slot 0 determines which module is being accessed and for how many samples Make sure that the lists on the data acquisition board and Slot 0 are compatible so that the samples are acquired as you intend See your SCXI 1000 1001 User Manual for more information In either Parallel or Multiplexed scanning mode you need a source for the HOLDTRIG source Typically the data acquisition board supplies the signal when you use Interval Scanning mode See Chapter 5 Programming for more information on Interval Scanning mode The HOLDTRIG signal can also be supplied at the front connector of the SCXI 1140 and sent out the HOLDTRIG pin of the rear signal connector to the data acquisition board to trigger each scan interval Notice that if you use SCXI 1140s in conjunction with other modules the module that is cabled to the data acquisition board must be an SCXI 1140 or must have the ability to route the HOLDTRIG signal to and from the SCXIbus T
93. hronous communication link 3 6 multiple chassis scanning 3 15 multiple module multiplexed scanning 3 14 multiplexer addressing 3 8 O offset adjustment 5 1 ONCE bit 4 8 operating environment for SCXI 1140 A 3 optional equipment 1 3 optional software 1 2 to 1 3 OUTPUT REF signal 2 19 B 2 output selection jumper 2 5 OUTPUT signal 2 19 B 2 P Parallel mode 3 8 PC LPM 16 putting SCXI 1140 into Track or Hold mode 5 5 SCXI 1342 PC LPM 16 adapter board cables and cabling E 5 to E 7 installation E 6 to E 7 physical specifications A 3 pin assignments front connector 2 9 D 2 rear signal connector 2 18 B 1 SCXI 1343 rear screw terminal adapter E 12 to E 14 SCXIbus connector 3 4 C 2 pin equivalences SCXI 1341 pin translations E 4 SCXIbus equivalents for rear signal connector 3 6 5 2 National Instruments Corporation SCXIbus to SCXI 1140 rear signal connector to data acquisition board pin equivalences 2 22 power specifications A 2 programming notation 5 1 register descriptions Configuration Register 4 3 to 4 5 Module ID Register 4 2 Slot 0 Register FIFO Register 4 9 Hardscan Control Register 4 8 overview 4 6 Slot Select Register 4 7 register writes 5 1 to 5 3 initialization 5 3 register selection and write procedure 5 2 to 5 3 SCXI 1140 rear signal connector pin equivalences 5 2 scanning measurements 5 8 to 5 18 acquisition enable triggering and servicing 5 18 Counter
94. iate mode of operation disregarding the fact that other chassis will be involved except for the routing of the Hold Trigger 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 Multiple Module Scanning section shown previously in this chapter and program the thirteenth and fourteenth modules according to Channel Scanning from the SCXI 1140 via Another Module SCXI 1140 User Manual 5 16 O National Instruments Corporation Chapter 5 Programming The SCXI 1350 multichassis adapters connect the HOLDTRIG pins of all modules that have a connection to the cable assembly Thus you can bring the Hold Trigger signal into the front connector of one module bus it on TRIG1 to another module send it out the HOLDTRIG on the rear signal connector of that module to the data acquisition board and the other chassis bring it into a module on another chassis and send it onto the TRIGI of that chassis where another module finally uses it Such a complicated scheme can introduce a timing skew of up to 250 nsec between modules If you use the data acquisition board as the Hold Trigger source the maximum skew is not as significant If you must externally supply the Hold Trigger it is best t
95. ielded cables you are using SCXI 1346 shielded cable multi chassis adapters leave the jumpers in their factory default positions both in position A B If the SCXI 1140 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 multi chassis adapters leave jumper W 14 in its factory default position position A B On all but one of the SCXI 1140s that are cabled to the data acquisition board move jumper W 13 to position B C It does not matter which of the SCXI 1140 modules that are cabled to the data acquisition board has jumper W 13 set to position A B If you have different types of modules cabled to the data acquisition board those different modules will have jumpers similar to W14 and W13 of the SCXI 1140 Set those jumpers on the different modules using the same method described here for the SCXI 1140 SCXI 1140 User Manual 2 4 O National Instruments Corporation Chapter 2 Configuration and Installation On Revision A and B SCXI 1140s jumper W13 is not used You set jumper W14 as explained in the cases above except in the case of a multiple chassis ribbon cable system In a multichassis ribbon cable system with Revision A and B SCXI 1140s cabled to the data acquisition board you can access the MISO line in only one chassis Pick one of the chassis and set jumper W14 to position A B on the SCXI 1140 in that chassis that is cabled to the da
96. imum 110 dB typical 30 V on each terminal powered on 15 V on each terminal powered off A 1 SCXI 1140 User Manual Specifications Appendix A AC Output noise spectral density 75 nVN Hz Input noise spectral density 12 nV A Hz Channel output slew rate 15 V usec Full Scale Settling Time Gains 3 dB Bandwidth 0 01 0 003 0 0015 0 00076 1 2 MHz 7 usec 8 usec 10 usec 15 usec 10 800 kHz 7 usec 7 usec 11 usec 20 usec 100 500 kHz 7 usec 7 usec 11 usec 20 usec 200 300 kHz 7 usec 8 usec 11 usec 20 usec 300 180 kHz 10 usec 12 usec 12pusec 20 sec 500 120 kHz 15 usec 16usec 20pusec 25 usec 600 100 kHz 20 usec 20 usec 20usec 25 usec 700 80 kHz 25 usec 25 usec 30 usec 30 usec 800 70 kHz 25 usec 30 usec 30 usec 35 usec Output multiplexer settling time 1 5 usec to 0 01 5 usec to 0 00076 Sampling 0 012 0 003 0 0015 0 00076 Acquisition time 7 usec 10 usec 50 usec msec Hold mode settling time I usec I usec I usec 2 usec Hold step 5 mV Droop rate 10 mV sec Effective aperture delay time 50 nsec Interchannel skew 50 nsec Intermodule skew 100 nsec Power V supply current 85 mA V supply current 85 mA 5 V supply current 10 mA Total power dissipation 4W SCXI 1140 User Manual A 2 O National Instruments Corporation Appendix A Specifications Physical Dimensions 1 2 by 6 8 by 8 0 in I O connectors Input 96 pin DIN C front connector Output 50 pin male ribbon cable rear connector Operating Environment Temper
97. in through a buffer ABO to drive the OUTPUTREF pin directly and prevents the SCXI 1140 from driving the analog bus This step also sends SCANCLK onto TRIGO Program the bits marked UU to 10 when you use an NB MIO 16 board and to 01 when you use any other MIO 16 board Program the four bits marked DDDD as follows If the other module needs the Hold Trigger signal and it will come from the data acquisition board or will be connected to the HOLDTRIG pin on the SCXI 1140 front connector the bits become 0001 The SCXI 1140 then receives the Hold Trigger signal from the HOLDTRIG pin front or rear and sends the inverted Hold Trigger signal on the SCXIbus TRIGI line If the other module receives the Hold Trigger signal at its front or rear signal connector and it is not necessary to send the Hold Trigger signal to the board the bits become 0000 If the other module receives the Hold Trigger signal at its front or rear signal connector and it is necessary to send the Hold Trigger signal to the data acquisition board the bits O National Instruments Corporation 5 13 SCXI 1140 User Manual Programming Chapter 5 become 1110 This causes the SCXI 1140 to send the Hold Trigger signal that it receives from the TRIG1 SCXIbus line to the board If the other module does not need a Hold Trigger signal these are don t care bits XXXX 3 Program the other module to be scanned to drive Analog Bus 0 with its output
98. ing 5 12 to 5 13 programming examples 5 18 to 5 21 programming the Slot 0 hardscan circuitry 5 17 to 5 18 steps for performing 5 8 scanning modes 3 11 to 3 15 multiple chassis scanning 3 15 multiple module multiplexed scanning 3 15 overview 3 11 to 3 12 single module multiplexed scanning direct scanning 3 13 indirect scanning 3 14 single module parallel scanning 3 12 SCXI 1140 User Manual SCCT lt 7 0 gt bit 4 3 SCXI 1140 See also configuration installation theory of operation contents of kit 1 2 custom cables 1 4 illustration of 1 1 optional equipment 1 3 optional software 1 2 to 1 3 overview 1 1 to 1 2 SCXI 1180 feedthrough panel cabling E 7 front panel installation E 9 installation E 7 to E 9 rear connections E 8 SCXI 1302 50 pin terminal block installation E 10 wiring procedure E 9 to E 10 SCXI 1340 cable assembly E 1 to E 2 installation E 3 pin equivalences of MIO 16 and SCXI 1140 E 2 SCXI 1341 installation E 5 Lab NB Lab PC Lab PC cable assembly E 3 to E 5 SCXI 1342 PC LPM 16 adapter board cable assembly E 5 to E 6 installation E 6 to E 7 SCXI 1343 rear screw terminal adapter installation E 13 pin connections E 12 to E 13 SCXI 1344 installation E 5 Lab LC cable assembly E 3 to E 5 SCXI 1350 multichassis adapter cabling E 11 installation E 11 to E 12 SCXI 1351 one slot cable extender cabling E 11 installation E 11 SCXlIbus connector 3 3 to 3 6 pin assignments 3 4
99. ing another slot write zero to the Slot 0 Slot Select Register If you are selecting another slot repeat the procedure starting at step 3 For a timing illustration of a Configuration Register write see Figure 2 20 Configuration Register Write Timing Diagram which shows the proper write to configure an SCXI 1140 that is directly cabled to an AT MIO 16 board for multiple module multiplexed scanning with a start channel of five and a scan control count of one Initialization The SCXI 1140 powers up with its Configuration Register cleared to all zeros This state is also forced by an active low signal on the RESET pin of the SCXIbus connector In the reset state Channel 0 is connected to OUTPUT on the rear signal connector The module is disconnected from Analog Bus 0 The Hold Trigger is in Level Sensitive mode and uses the HOLDTRIG pins on the front or rear signal connector as its source The TRACK HOLD pin is high impedance and the Hold Trigger signal is not sent on TRIGI Track and Hold Modes The SCXI 1140 analog channels have two modes Track mode in which the outputs at the rear signal connector follow the inputs at the front connector and Hold mode in which the outputs freeze at the voltage that was present at the inputs when the Hold Trigger occurred Because the SCXI 1140 is factory calibrated in Hold mode you must ensure that the module is in Hold mode when readings are taken Because the outputs of the SCXI 1140 droop when the
100. ingle Module Multiplexed Scanning Indirect Multiple Module Multiplexed Scanning In this mode all of 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 onto TRIGO for the other modules and Slot 0 as shown in Figure 3 10 Either the data acquisition board or the front connector of one of the modules can supply the HOLDTRIG signal The HOLDTRIG signal is bused on TRIGI of the SCXIbus Program the scan list in Slot 0 of one of the modules with the sequence of modules and the number of samples per entry SCXI 1140 User Manual 3 14 O National Instruments Corporation Chapter 3 Theory of Operation SCXI 1000 or SCXI 1001 Chassis SCANCON X SCANCON B Data Acquisition Board 5 Q B 5 Q bn 8 E E Hold Timing Analog Input H fi horia S E Cable Assembly Analog Bus 0 Figure 3 10 Multiple Module Multiplexed Scanning Multiple Chassis Scanning In Multiple Chassis Scanning mode you attach each chassis to a daisy chain of cable assemblies and multichassis adapter boards as shown in Figure 3 11 Program each chassis separately each occupies a dedicated channel of the data acquisition board Either the data acquisition board or the front connector of one of the modules can supply the HOLDTRIG signal The HOLDTRIG signal is sent to all chassis over the HOLDTRIG line of the cable assemblies and is bused on TRIGI w
101. input Thermoelectric effects make it difficult to keep a short circuit from generating such voltages The best solution is to use short lengths of heavy copper wire and to keep the short away from heat sources As mentioned previously channels 1 through 7 have slightly different output offsets in Parallel mode and Multiplexed mode Thus for proper calibration you must decide which mode you plan to use in normal operation The module is factory calibrated for use in Multiplexed mode Be careful not to leave the module in Track mode during data acquisition The SCXI 1140 should switch between Track mode and Hold mode with the data acquisition board sampling occurring while the module is in Hold mode For the offset of the data acquisition board not to affect the calibration you must subtract the offset from all module offset measurements Thus you must first measure the offset to an accuracy better than that to which the module is to be calibrated Furthermore setting the data acquisition board to a high gain 100 for example makes it possible to resolve offset changes that would be indiscernible at lower gains Because the data acquisition board offset will not be independent of gain you should set the gain first and then measure the offset To measure the offset disconnect the module from the data acquisition board short circuit the board inputs to ground and take some data The measured value is the offset For a reliable value use softwa
102. ion Chapter 4 Bit Name 6 CLKSELECT 5 SCANEN 3 SCANCLKEN 2 SCANCONEN 1 ABOEN 0 FOUTEN O National Instruments Corporation Register Descriptions Description continued Scanclock Select Determines whether the SCXI 1140 uses SCANCLK or the inverted form of TRIGO to clock the output multiplexer to scan through the analog channels If CLKSELECT is cleared to zero SCANCLK clocks the output multiplexer If CLKSELECT is set to one TRIGO is used as the source to clock the output multiplexer Scan Enable Determines whether the output multiplexer will be clocked by the local SCANCLK If this bit is cleared to zero the output multiplexer is not clocked If this bit is set to one the output multiplexer is clocked by the local SCANCLK Scan Clock Enable Determines whether the output multiplexer increments on each clock signal the clock source is determined by CLKSELECT or keeps its loaded value If SCANCLKEN is cleared to zero the output multiplexer is clocked during scans If SCANCLKEN is set to one the output multiplexer is not clocked Scan Control Enable When set to one enables the SCANCON signal Analog Bus 0 Enable Determines whether Analog Bus 0 on the SCXIbus drives OUTPUT on the rear signal connector If ABOEN is cleared to zero Analog Bus 0 does not drive OUTPUT If ABOEN is set to one Analog Bus 0 drives OUTPUT through a buffer and Analog Bus 0 is connected to OUTPUT REF Forc
103. ional Instruments Corporation Chapter 5 Programming must assert SS to the module or hit the reset switch to put the module back into Track mode before you create another rising edge on OUT2 Before trying to set Track or Hold modes make sure you have followed the steps in the Initializing the MIO Board section in your board user manual You will need to decide whether to operate the SCXI 1140 in Edge Triggered mode or Level Sensitive mode Using a Lab NB Lab PC Lab PC or Lab LC Board Consult the Programming chapter in your Lab PC Lab PC Lab NB or Lab LC user manual for register locations and initialization procedures Before programming your module establish OUTB1 HOLDTRIG low e Write 70 hex to the Counter Mode Register to put Counter I into mode 0 output low HOLDTRIG should now be low Check it on the HOLDTRIG pin of the front signal connector Now program your modules for single measurements Notice that you can use either Level Sensitive or Edge Triggered mode for the Hold Trigger signal Put the module or modules into Hold mode e Write 78 hex to the Counter Mode Register to put Counter 1 into mode 4 output high Alternate between the two lines to go between Track mode and Hold mode If you are using edge sensitive triggering you must assert SS to the module or hit the reset switch to put it back into Track mode before you create another rising edge on OUTBI You cannot program the OUTB1 pin to a high impedance
104. iplex the outputs onto a single channel You can use SCXI 1140 switches to connect other SCXI 1140 outputs to the same channel over the analog bus The block diagram in Figure 3 1 illustrates the key functional components of the SCXI 1140 The major components of the SCXI 1140 are the digital interface the timing control circuitry the track and hold circuitry and the analog circuitry The theory of operation of each of these components is explained in the remainder of this chapter O National Instruments Corporation 3 1 SCXI 1140 User Manual Theory of Operation Chapter 3 Rear Signal Connector Analog Bus S g Q o S Q n 3 ro p lt Q A Interface and Timing External Hold Trigger Input Input Protection Protection Front Signal Connector Figure 3 1 SCXI 1140 Block Diagram SCXI 1140 User Manual 3 2 O National Instruments Corporation Chapter 3 Theory of Operation Digital Interface The block diagram in Figure 3 2 illustrates the digital interface circuitry of the SCXI 1140 Rear Signal Connector Data Acquisition to SCXI Interface Configuration Register Module ID Register Figure 3 2 SCXI 1140 Digital Interface Circuitry Block Diagram SCXIbus Connector The digital interface circuitry is divided into five main sections the SCXIbus connector the rear signal connector the data acquisition to SCXI interface the Configuration Register and the Module ID Register SCXIbus
105. ired 1 Connect the module with the top cover removed so that the pots and DIP switches are readily accessible 2 Short each input of the module to ground 3 Program the module and data acquisition board to take data in the desired output mode Multiplexed or Parallel 4 Setthe data acquisition board to a high gain and measure its offset by shorting its input You must subtract this measured offset from all subsequent module measurements to ensure accuracy 5 Measure the output of the first channel with its gain set to one and adjust its output offset pot until the output is close to zero 6 Measure the output of the same channel with its gain set to 500 and adjust its input offset pot until the output is close to zero 7 Repeat steps 5 and 6 until the offset at both gains is as close to zero as desired 8 Repeat steps 5 through 7 for all other channels you want to calibrate 9 Reinstall the module enclosure O National Instruments Corporation 6 3 SCXI 1140 User Manual Calibration Procedures Chapter 6 Steps 1 through 9 of the calibration procedure are elaborated on as follows l Position the module so that the chassis has several empty slots in the right side of the module Alternatively contact National Instruments concerning availability of an SCXIbus extender board At low gains more alternatives exist to serve as a short circuit but at a gain of 500 1 mV referred to the output is only 2 UV referred to the
106. ister and the Module ID Register The Configuration Register is a 32 bit serial 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 Use the Configuration Register for channel selection and for configuring the SCXI 1140 for scanning and control options Complete descriptions of the register bits are given in Chapter 5 Programming Writes to the Configuration Register consist of 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 SPICLK clocks it into the register des 99s zb9 SS goes high and D A goes high indicating an end of communication This action latches the Configuration Register bits When you reset the SCXIbus all bits in the Configuration Register are cleared The Module ID Register connects to MISO on the SCXIbus The Module ID Register is an eight bit parallel in serial out shift register and an SPI communication adapter The contents of the Module ID Register are written onto MISO during the first four bytes of transfer after SS has been asserted low Zeros are written to MISO thereafter until SS is released and reasserted The SCXI 1140 module ID is hex 00000008 Timing Control Circuitry Figure 3 4 illustrates the timing control circuitry which consi
107. ithin each chassis Within each chassis scanning operations act as if the other chassis are not being used with one exception To keep the chassis synchronized 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 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 1140 Cabling for more information on the necessary cable accessories for multichassis scanning Data Acquisition Board Multichassis Multichassis Multichassis Cable A t A t Adapter Asserably dapter Cable dapter Gu ap Input Ch N Assemblies Input Ch 1 Input Ch 0 Timing I O Figure 3 11 Multiple Chassis Scanning O National Instruments Corporation 3 15 SCXI 1140 User Manual Chapter 4 Register Descriptions This chapter describes in detail the SCXI 1140 Configuration Register the Module ID Register and the Slot 0 registers Note If you plan to use a programming software package such as NI DAQ for DOS Windows NI DAQ for Macintosh LabWindows or LabVIEW with your SCXI 1140 module you do not need to read this chapter Register Description Register Description Format This register description chapter discusses the SCXI 1140 registers and the Slot O registe
108. l Connector Description continued 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 Reserved Slot 0 Select Taps into the SCXIbus INTR line to indicate whether the information on MOSI is being sent to a module or Slot 0 Scan Clock Indicates to the SCXI 1140 that a sample has been taken by the data acquisition board and causes the SCXI 1140 to change channels Serial Clock Tps into the SCXIbus SPICLK line to clock the data on the MOSI and MISO lines Track Hold Can be programmed to reflect the state of the module low in Track mode or high in Hold mode It can also be programmed to a high impedance output HOLDTRIG You can program HOLDTRIG to input or output the Hold Trigger signal for the module You can use the Hold Trigger signal to place the module into Hold mode This signal is also brought out to the front connector B 3 SCXI 1140 User Manual Appendix C SCXIbus Connector This appendix describes the pinout and signal names for the SCXI 1140 96 pin SCXIbus connector including a description of each signal The connector is a triple 4x6 metral receptacle Figure C 1 shows the pin assignment for the SCXIbus connector RESET MISO V V V V CHSGND CHSGND CHSGND CHSGND V V V V 5 V 5 V SPICLK MOSI TRIGO TRIG1 SS SCANCON Figure C 1 SCXI 1140 SCXIb
109. le negative input channel number counts per second digital to analog decibels Deutsche Industrie Norme dual inline package first in first out hexadecimal Hardscan Control Register hertz identification inches input current leakage input current input output output current least significant bit meters megabytes of memory module positive output channel number module negative output channel number most significant bit multiplexed temperature sensor O National Instruments Corporation Glossary 1 SCXI 1140 User Manual Glossary ppm parts per million RAM random access memory rms root mean square RTSI Real Time System Integration SCXI Signal Conditioning eXtensions for Instrumentation bus SDK Software Developer s Kit S seconds SPI serial peripheral interface UL Underwriters Laboratory V volts VI virtual instrument Vin volts input high Vit volts input low Vin volts in Vox volts output high Vor volts output low Vout volts out VAC volts alternating current VDC volts direct current Vrms volts root mean square SCXI 1140 User Manual Glossary 2 National Instruments Corporation
110. leared to zero the circuitry wraps around and continues seamlessly with the first scan list entry after the entry is finished 3 HSRS Hardscan Reset When cleared to zero this bit resets the FIFO and all the hardware scanning circuitry to the power up state When set to one this bit has no effect 2 LOAD Load When cleared to zero forces a loading of the Slot 0 sample counter with the output of the FIFO When set to one this bit has no effect 1 SCANCONEN Scan Control Enable When set to one this bit enables the SCANCON lines When cleared to zero all SCANCON lines are disabled high 0 CLKEN Clock Enable When set to one this bit enables TRIGO as a hardscan circuitry clock When cleared to zero TRIGO is disabled SCXI 1140 User Manual 4 8 O National Instruments Corporation Chapter 4 Register Descriptions FIFO Register The FIFO Register adds 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 using 14 as the slot number and writing 16 bits to the FIFO Register The register shifts in the data present on the MOSI line bit 15 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
111. led 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 in Slot 0 Open collector Output Negative Analog Supply 18 5 to 25 V Positive Analog Supply 18 5 to 25 V 5 VDC Source Digital power supply Serial Peripheral Interface SPI 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 3 5 SCXI 1140 User Manual Theory of Operation Chapter 3 Pin Signal Name Description continued TRIGO A24 TRIGO General purpose trigger line used by the SCXI 1140 to send SCANCLK to other modules or receive SCANCLK from other modules Open collector I O B24 SS Slot Select When low enables module communications over the SCXIbus Totem pole Input C24 SCANCON Scanning Control Combination output enable and reload signal for scanning operations Each module in a chassis receives a separate SCANCON Totem pole Input D24 TRIGI TRIGI Can be used to synchronize several SCXI 1140s in the same chassis by forcing them to go into Hold mode at th
112. locator diagram in Chapter 2 Configuration and Installation to determine the location of each component SCXI 1140 User Manual 6 2 National Instruments Corporation Chapter 6 Calibration Procedures Table 6 1 Calibration Component Identification Output Offset Adjust Input Offset Adjust Gain DIP Switch 0 R9 A complicating factor in the calibration of the module is that the output offset is not the same in Track mode as in Hold mode This difference is because of a phenomenon known as hold step in which a small amount of charge is transferred to the track and hold amplifier hold capacitor during the transition from Track mode to Hold mode This charge transfer slightly changes the voltage at the output of the track and hold amplifier The magnitude of the hold step on the SCXI 1140 is approximately 5 mV enough to make it necessary to calibrate output offset in Hold mode rather than Track mode You may calibrate input offset without switching the module to Hold mode Another complication is the fact that channels 1 through 7 use different signal paths depending on whether the module is in Parallel Output mode or Multiplexed Output mode Thus the output offset voltage will be slightly different for the two modes The module is factory calibrated in Multiplexed mode Channel 0 uses the same signal path in both modes so its output offset is independent of the output mode To calibrate the SCXI 1140 module the following steps are requ
113. log Output Signal Connections 2 20 Digital I O Signal Connections ss 2 21 Timing Requirements and Communication Protocol 2 23 Timing Signals ss oce i dL a pr pea vous 2 23 Communication SIgTals 22295 and EURO Quo HERR AMOUR pA E V et RARE EX UK Y 2 26 O National Instruments Corporation v SCXI 1140 User Manual Contents Chapter 3 Theory of Operation saa 3 1 Fume tiGnial Overview us GA 3 1 Pigit lnter ACC eem 3 3 SC XIDUS Comme cton i A Na seca tbs sects a aee ac See 3 3 SCXIbus Connector Signal Descriptions eee 3 5 Digital Control CYreutttys edente ae elite diea anne te at 3 7 Taming Control Cireulky IDE 3 7 Muluplexer Addressing ss Antenne tato ee teo ude oerte 3 8 Track and Hold Control Circuitry eei ise ato tte nant set dece iustus s r 3 9 AxalomC ITO sordes de nieder an oudde TR E E E ect 3 10 SCaminsg Modes MEN Cm 3 11 Single Module Parallel SCantlng sien coc tapete Uere Re INE eed setatis 3 12 Single Module Multiplexed Scanning 3 13 Single Module Multiplexed Scanning Direct 3 13 Single Module Multiplexed Scanning Indirect 3 14 Multiple Module Multiplexed Scanning 3 14 Multipl Chassis Scanning enr nie arte ailes 3 15 Chapter 4 Register Descriptions esie se 4 1 Register Reeve M 4 1 Register Description Format oen iot pere sisii bore etaten 4 1 SCXI 1140 ReSISI TS sisi intense ERR EAE EN b nnene
114. lone applications in which programming is difficult or impossible The module is useful even without programming in those cases because the module powers up and resets to the parallel output configuration The SCXI 1140 outputs are short circuit protected but are not overvoltage protected The SCXIbus provides power to each module in the 18 5 to 25 V range The SCXI 1140 regulates the power to 15 V The outputs of the regulators are clamped so that the overvoltage protection circuitry works properly without interfering with the voltages on the bus Scanning Modes The SCXI 1140 module has four basic 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 Only with the MIO 16 data acquisition boards can you scan the SCXI 1140 For additional information O National Instruments Corporation 3 11 SCXI 1140 User Manual Theory of Operation Chapter 3 consult either Chapter 2 Configuration and Installation Chapter 5 Programming your data acquisition board user manual or your SCXI chassis user manual If you need more information contact National Instruments During scanning a module sends the SCANCLK signal to Slot 0 over the SCXIbus TRIGO line and Slot 0 sends the SCANCON signal to the modules In Multiplexed mode this timing signal reloads the output multiplexer and determines when t
115. minimum Vy input logic low voltage 0 8 V maximum I input current leakage 1 HA maximum Digital output specifications referenced to DIG GND Vox output logic high voltage 3 7 minimum at 4 mA Vor output logic low voltage 0 4 maximum at 4 mA SCXI 1140 User Manual 2 22 O National Instruments Corporation Chapter 2 Configuration and Installation Timing Requirements and Communication Protocol Timing Signals The data acquisition timing signals are SCANCLK TRACK HOLD and HOLDTRIG Use SCANCLK to increment the output multiplexer on its rising edge Figure 2 12 illustrates the timing requirements on the SCANCLK signal These requirements ensure that SCANCLK is properly transmitted over TRIGO Thigh Fee ERNU Te 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 settling time specifications refer to Appendix A Specifications Use HOLDTRIG to put the module into Hold mode Figure 2 13 shows the timing requirements on the HOLDTRIG signal These requirements ensure that HOLDTRIG is properly transmitted over TRIGI Thigh SNE GJ Tlow Time low before rising edge 400 nsec minimum Thigh Time high before falling edge 250 nsec minimum Figure 2 13 HOLDTRIG Timing Requirements Notice that these are only requirements on the pulse widths of HOLDTRIG and do not imply that the SCXI 1140 will operate properly in Level Sensitive m
116. module is in Hold mode it is best to acquire the outputs quickly Level Sensitive Hold Trigger In this mode the SCXI 1140 is in Track mode when the Hold Trigger is low and is in Hold mode when the Hold Trigger is high Level Sensitive Hold Trigger mode is the default power up state and requires minimum software O National Instruments Corporation 5 3 SCXI 1140 User Manual Programming Chapter 5 Edge Sensitive Hold Trigger In this mode the SCXI 1140 goes into Hold mode on the rising edge of the Hold Trigger signal The SCXI 1140 goes back into Track mode after it receives the number of rising edges on SCANCON that is specified in the SCCT bits in the Configuration Register The module also goes back into Track mode if SS or RESET is pulled low Push the RESET button on the Slot 0 front panel to reset the chassis Single Channel Measurements This section describes how you program the SCXI 1140 either alone or in conjunction with other modules to make single channel or nonscanned measurements It also describes how you program the various data acquisition boards to put the module into Track or Hold mode Putting the SCXI 1140 into Track or Hold Mode Using an MIO Board Consult the Programming chapter of your data acquisition board user manual and Chapter 4 Register Map and Descriptions of the AT MIO 16D AT MIO 16X or AT MIO 64F 5 User Manuals for register locations and initialization procedures Make sure you have initializ
117. n 2 7 to 2 8 ground offset AC coupled signal connection 2 13 ground referenced AC coupled signal connection 2 13 ground referenced signal connection 2 12 grounding and shielding jumper 2 6 GUARD signal 3 5 C 3 O National Instruments Corporation Index H Hardscan Control Register 4 8 hardware calibration See calibration procedures hardware installation 2 8 Hold mode See Track and Hold modes HOLD signal 3 9 HOLDTRIG signal connecting or disconnecting for Lab NB Lab PC Lab PC Lab LC board E 4 digital input 2 14 digital timing 2 22 Edge Triggered Mode 2 25 front connector 2 11 D 3 Level Sensitive mode 2 24 module programming 5 12 to 5 17 putting SCXI 1140 into Track or Hold mode 5 4 to 5 5 rear signal connector 2 20 B 3 scanning modes 3 12 to 3 15 timing requirements 2 23 Track and Hold control circuitry 3 9 HSRS bit 4 8 HTRIGINEN bit 4 4 HTRIGOUTEN bit 4 4 I INO through INT signal 2 10 D 3 INO through IN7 signal 2 10 D 3 indirect measurements measurements from other modules 5 7 measurements from SCXI 1140 via another module 5 7 to 5 8 initializing the Configuration Register 5 3 input mode selection jumpers 2 6 installation See also configuration hardware installation 2 8 SCXI 1180 feedthrough panel E 7 to E 9 SCXI 1302 50 pin terminal block E 10 SCXI 1340 E 3 SCXI 1341 1344 E 5 SCXI 1342 PC LPM 16 adapter board E 6 to E 7 SCXI 1343 rear screw terminal ada
118. nals to generate linear correction factors for all subsequent measurements Specifically if input X yields measurement x and input Y yields measurement y then you should process measurement z as shown in the following equation to yield the corrected measurement Z Z X Y X z x y x Linearity Adjustment The SCXI 1140 seldom needs linearity adjustment because its linearity is quite good especially at low gains and error is often dominated by the nonlinearity of the data acquisition board you use If necessary the method described previously for correcting gain and offset error may be extended to include linearity by taking more points along the transfer function and processing subsequently acquired data according to a polynomial fit of the calibration points Alternatively and preferably for data acquisition boards with no more than 12 bits of resolution you can determine the nonlinearity of the system on a code by code basis and you can subtract the error of each code from any measurement that returns that value This method has the advantage of correcting differential as well as integral linearity errors However this method may be time consuming If time permits you may use it with even higher resolution data acquisition boards Describing methods of measuring system nonlinearity is outside the scope of this manual If linearity correction becomes necessary you can contact National Instruments for assistance Hardware Calibration
119. nerally do not need to connect additional cabling to the SCXI 1140 Typically only one module in a chassis is cabled to a board If your chassis has different types of modules cable the data acquisition board to one of the SCXI 1140 modules For installation procedures with other SCXI accessories and data acquisition boards consult Appendix E SCXI 1140 Cabling 6 Check the installation 7 Turn on the SCXI chassis 8 Turn on the computer The SCXI 1140 module is installed and ready for operation Signal Connections This section describes the input and output signal connections to the SCXI 1140 module via the SCXI 1140 front and rear signal connectors and includes specifications and connection instructions for the SCXI 1140 connector signals Warning Connections that exceed any of the maximum ratings of input or output signals on the SCXI 1140 can result in damage to the SCXI 1140 module to the SCXIbus to any connected data acquisition board and to the computer in which the data acquisition board is installed 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 The Front Connector Figure 2 4 shows the pin assignments for the SCXI 1140 front connector O National Instruments Corporation 2 9 SCXI 1140 User Manual Configuration and Installation Chapter 2 Pin Signal Column Signal
120. ng position Factory default setting Factory default setting revisions A and B modules only Factory default setting connects pullup to SERDATOUT revision C and later Parking position not connected on revisions A or B modules O National Instruments Corporation 2 5 SCXI 1140 User Manual Configuration and Installation Chapter 2 Analog Configuration The SCXI 1140 has 10 analog configuration jumpers W1 through W9 and W12 and eight gain setting four position DIP switches U12 through U19 Input Mode Selection Jumpers W1 through W8 Position A B leaves the negative input of the instrumentation amplifier connected only to the front connector This is the factory default setting Position B C connects the negative input of the instrumentation amplifier to the module analog ground through a 100 kQ resistor This setting is useful for keeping floating non ground referenced sources from saturating the instrumentation amplifier Table 2 2 shows the input mode jumper and channel selections Table 2 2 Input Mode Selection Jumpers Output Selection Jumper W9 Position A B leaves pin 19 AIGND NC of the rear signal connector unconnected and is the factory default setting Position B C connects the module analog ground to pin 19 AIGND NC of the rear signal connector Use this position for MIO boards operating in NRSE mode Grounding and Shielding Jumper W12 Position A B connects the module analog ground to the
121. nstallation describes the SCXI 1140 jumper configurations DIP switch settings installation of the SCXI 1140 into the SCXI chassis signal connections to the SCXI 1140 and cable wiring e Chapter 3 Theory of Operation contains a functional overview of the SCXI 1140 module and explains the operation of each functional unit making up the SCXI 1140 e Chapter 4 Register Descriptions describes in detail the SCXI 1140 Configuration Register the Module ID Register and the Slot 0 registers Chapter 5 Programming contains a functional programming description of the SCXI 1140 and Slot 0 e Chapter 6 Calibration Procedures discusses the calibration procedures for the SCXI 1140 module e Appendix A Specifications lists the specifications for the SCXI 1140 e Appendix B Rear Signal Connector describes the pinout and signal names for the SCXI 1140 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 1140 96 pin SCXIbus connector including a description of each signal Appendix D SCXI 1140 Front Connector describes the pinout and signal names for the SCXI 1140 front connector including a description of each connection e Appendix E SCXI 1140 Cabling describes the usage and installation of the hardware accessories that you can use with the SCXI 1140 O National Instruments Corporation xi SCXI 1140 User Manual About Thi
122. nt for the gains of both the SCXI 1140 and the data acquisition board when you calculate the actual voltage present at the input of the SCXI 1140 To measure one of the eight differential input channels to the SCXI 1140 perform the following steps 1 Write the binary pattern XXXXXXXX XCCCXXXX X0UU0000 00000000 to the SCXI 1140 Configuration Register 2 Put the SCXI 1140 into Hold mode 3 Measure the voltage with the data acquisition board 4 If desired make other measurements quickly before the SCXI 1140 output voltage droops too much 5 Return the SCXI 1140 to Track mode SCXI 1140 User Manual 5 6 O National Instruments Corporation Chapter 5 Programming Indirect Measurements Measurements from Other Modules To perform measurements from other modules you must cable the SCXI 1140 rear signal connector to a data acquisition board Indirect measurements pass one analog signal over Analog Bus 0 and therefore are considered multiplexed measurements See Chapter 2 Configuration and Installation 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 1140 clearing the ABOEN bit in the Configuration Register ensures that its output is not driving ABO 2 Write the binary pattern XXXXXXXX XXXXXXXX XOUUDDDD 00000011 to the SCXI 1140 Configuration Register This step causes ABO to drive the O
123. o supply it to the module in any chassis that has a direct connection to the data acquisition board Because the HOLDTRIG pins on the front and rear signal connectors are the same you will drive all chassis simultaneously except for cable length and capacitance delays thus eliminating several delay elements If the additional skew caused by one backplane routing is too significant for your needs and you have a strong enough driver you can cable the HOLDTRIG pin on all the modules together Recall that the delay in a typical wire is about 1 5 nsec ft 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 SCXI 1000 1001 User Manual Descriptions of the Slot 0 registers are given earlier in the section Slot 0 Register Descriptions To program the hardscan circuitry perform the following steps 1 Write binary 0000 0000 to the HSCR 2 Write binary 0000 1000 to the HSCR 3 Write the Slot 0 scan list to the FIFO 4 Write binary 0010 1100 to the HSCR 5 Write binary 101S 1100 to the HSCR 6 Write binary 101S 1110 to the HSCR 7 Write binary 1015 1111 to the HSCR To program the hardscan circuitry to use the current scan list perform the following steps 1 Write binary 0000 1000 to the HSCR 2 Write binary 0100 1000 to the HSCR 3 Write
124. o change which eventually puts the module back into Track mode as shown in Figure 2 16 SCXI 1140 User Manual 2 24 O National Instruments Corporation Chapter 2 Configuration and Installation HOLDTRIG HE eee SCANCLK Sy M TRACK HOLD TRIGI RAN y TRIGO n Fra HOLDTRIG rise to TRACK HOLD rise 90 nsec typical HOLDTRIG rise to TRIGI fall 30 nsec typical SCANCLK fall to TRIGO rise 300 nsec typical SCANCLK rise to TRIGO fall 50 nsec typical SCANCLK rise to TRACK HOLD fall 170 nsec typical HOLDTRIG fall to TRIGI rise 300 nsec typical Figure 2 16 Edge Triggered Mode HOLDTRIG Source In Edge Triggered mode when TRIGI is the source of the Hold Trigger the falling edge of TRIGI puts the module into Hold mode After enough samples have been taken a SCANCLK causes SCANCON to change which eventually puts the module back into Track mode as shown in Figure 2 17 TRIGI TI c SCANCLK TRACK HOLD See NE HOLDTRIG l2 Ep TRIGI fall to TRACK HOLD rise 100 nsec typical 1 m cable TRIGI fall to HOLDTRIG rise 100 nsec typical 1 m cable SCANCLK rise to TRACK HOLD fall 170 nsec typical TRIGI rise to HOLDTRIG fall 100 nsec typical 1 m cable Figure 2 17 Edge Triggered Mode TRIGI Source O National Instruments Corporation 2 25 SCXI 1140 User Manual Configuration and Installation Chapter 2 Communication Signals This section describes the methods for communic
125. ode input range 2 14 communication signals 2 26 to 2 29 Configuration Register write timing diagram 2 28 reading from Module ID Register 2 29 serial data timing diagram 2 27 slot select timing diagram 2 27 writing to Configuration Register 2 28 writing to Slot 0 2 26 configuration See also installation signal connections analog configuration gain selection 2 7 to 2 8 grounding and shielding jumper W12 2 6 input mode selection jumpers W1 through W8 2 6 output selection jumper W9 2 6 digital signal connections jumper W11 2 3 jumper W13 2 4 jumper W14 2 4 fixed jumpers 2 3 parts locator diagram 2 2 user configurable jumpers 2 3 Configuration Register SCXI 1140 User Manual description of 4 3 to 4 5 digital control circuitry 3 7 initializing 5 3 procedure for writing to 2 28 3 7 write timing diagram 2 28 connector and shell assembling 2 15 to 2 16 customer communication xiii G 1 D D A signal 3 5 C 3 DAQD A signal communicating on SPI bus 2 26 to 2 29 definition of 2 19 B 3 digital input 2 20 register selection and write procedure 4 12 data acquisition board setup programming 5 9 to 5 12 DC specifications A 1 DGND signal 2 11 E 3 DIG GND signal 2 19 B 2 digital control circuitry 3 7 digital I O signal connections 2 21 to 2 22 digital input signals 2 21 digital output signals 2 21 digital timing signals 2 22 SCXIbus to SCXI 1140 pin equivalences 2 22 specification
126. ode with a I MHz HOLDTRIG signal See Appendix A Specifications for the settling time requirements of the SCXI 1140 module The following diagrams show the timing delays of TRIG1 TRACK HOLD HOLDTRIG SCANCLK and TRIGO In Level Sensitive mode when HOLDTRIG is the source of the Hold Trigger the TRACK HOLD signal follows HOLDTRIG and TRIGI inverts HOLDTRIG as shown in Figure 2 14 O National Instruments Corporation 2 23 SCXI 1140 User Manual Configuration and Installation Chapter 2 HOLDTRIG TRACK HOLD HOLDTRIG rise to TRACK HOLD rise 40 nsec typical HOLDTRIG rise to TRIGI fall 30 nsec typical HOLDTRIG fall to TRACK HOLD fall 40 nsec typical HOLDTRIG fall to TRIGI rise 300 nsec typical Figure 2 14 Level Sensitive Mode HOLDTRIG Source In Level Sensitive mode when TRIGI is the source of the Hold Trigger both the TRACK HOLD pin and the HOLDTRIG pin give the inverse of TRIGI as shown in Figure 2 15 TRIGI TRACK HOLD HOLDTRIG TRIGI fall to TRACK HOLD rise 100 nsec typical 1 m cable TRIGI fall to HOLDTRIG rise 100 nsec typical 1 m cable TRIGI rise to TRACK HOLD fall 100 nsec typical 1 m cable TRIGI rise to HOLDTRIG fall 100 nsec typical 1 m cable Figure 2 15 Level Sensitive Mode TRIG1 Source In Edge Triggered mode when HOLDTRIG is the source of the Hold Trigger the rising edge of HOLDTRIG puts the module into Hold mode After enough samples have been taken a SCANCLK will cause SCANCON t
127. older 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 No Connect Solder pad TRACK HOLD Solder pad No Connect Solder pad No Connect Solder pad No Connect Solder pad RSVD Solder pad No Connect Solder pad No Connect Solder pad HOLDTRIG Solder pad No Connect Solder pad No Connect Solder pad No Connect Solder pad No Connect Solder pad O National Instruments Corporation E 13 SCXI 1140 User Manual SCXI 1140 Cabling Appendix E SCXI 1343 Installation 1 Insert each wire through the adapter strain relief Make all solder connections first Connect the other wires to the screw terminals Tighten the strain relief screws to secure the wires CA Kup SE VII Plug the adapter board front connector to the module rear signal connector A corner of the adapter board enters the upper board guide of the chassis 6 Screw the rear panel to the threaded strips in the rear of the chassis SCXI 1140 User Manual E 14 O National Instruments Corporation Appendix F Revision A and B Photograph and Parts Locator Diagram This appendix contains a photograph of the Revision A and B SCXI 1140 signal conditioning module and the SCXI 1140 parts locator diagram Figure F 1 shows the SCXI 1140 module Figures F 2 shows the parts locator diagram of the Revision A and B SCXI 1140 Figure F 1 Revision A and B SCXI
128. onal Instruments Corporation Contents Scanning Meas rermients cci n tse ia Ree edax sii S eV ae EON TY etant de sececandacanvenens 5 8 1 Data Acquisition Board Setup Programming 5 9 Counter 1 and SCANDIV te nie rite etra ed lentes 5 12 2 Module PtOBEaIWllfig reine et ao i EVE dnne 5 12 Single Module Parallel Scanning 5 12 Single Module Multiplexed Scanning Direct 5 13 Single Module Multiplexed Scanning Indirect 5 13 Multiple Module Multiplexed Scanning 5 15 Multiple Chassis Scanning eene 5 16 3 Programming the Slot 0 Hardscan Circuitry eesssss 5 17 4 Acquisition Enable Triggering and Servicing ss 5 18 Scanning Example Shiites cedent ns i ue utu ene seat E eea esee Novas 5 18 Example e rat 5 18 Example Due see GPS 5 19 Example 2D D 5 20 beu ic T a a e boas e E St H WE 5 20 Chapter 6 Calibration Procedures ss 6 1 Software C allBEattolo uc en ne tee sedute as dene ease ed 6 1 GE Ge ceste eon Mp od o MN RD M M IDQNE S DENN I edid 6 1 Grat AGUSUMENE d occi cot dedu bt add keen 6 1 Linearity Adjustmentin onis sa tesoro tase etat eddie tem AMET 6 2 Hardware Calibration onte dade o dee Blea eg ates na ir nue 6 2 Appendix A Specifications aee en a tacite teu redi o natn ease aden EL es A 1 pon A 1 EE EE EEE EE
129. ou want to calibrate There is no calibration interdependence among the channels Remove the SCXI 1140 module from the SCXI chassis replace the top cover and insert the module back into the chassis SCXI 1140 User Manual 6 4 O National Instruments Corporation Appendix A Specifications This appendix lists the specifications for the SCXI 1140 These are typical at 25 C unless otherwise stated The operating temperature range is 0 to 50 C DC Maximum output voltage Input offset voltage Temperature drift Output offset voltage Temperature drift Input bias current Input offset current Common mode range Input impedance Gains DIP switch selectable 1 10 100 200 300 500 600 700 800 Common mode rejection ratio Gain I Gain 10 Gain gt 100 Input protection O National Instruments Corporation 10 V 100 uV maximum 10 uV C maximum 2 mV maximum 150 uV C maximum 100 pA typical 10 nA maximum 10 pA 12 V with zero differential input voltage 7 V at full scale output 100 GQ in parallel with 20 pF Max Nonlinearity Max Gain Error Max Gain Tempco 0 05 25 ppm C 0 01 0 1 25 ppm C 0 01 0 2 45 ppm C 0 02 0 4 60 ppm C 0 02 0 3 0 6 80 ppm C 0 03 1 0 100 ppm C 0 04 0 2 1 5 120 ppm C 0 05 0 1 2 0 150 ppm C 0 06 0 3 3 0 200 ppm C 0 07 70 dB minimum 90 dB typical 87 dB minimum 104 dB typical 100 dB min
130. path are the instrumentation amplifiers which fulfill two purposes on the SCXI 1140 module First the instrumentation amplifiers convert differential input signals into single ended signals referred to the SCXI 1140 ground for input common mode signal rejection With this conversion you can extract the analog input signals from common mode noise voltages before the data acquisition board samples and converts the signals Second the instrumentation amplifiers amplify input signals resulting in an increase in measurement resolution and accuracy Furthermore the amplifiers exhibit low bias currents and good bandwidth even at high gains You can select gains for each channel independently with separate DIP switches Gains are 1 10 100 200 and 500 although gains of 300 600 700 and 800 are available with reduced accuracy See Appendix A Specifications for details on the performance of the instrumentation amplifiers The track and hold amplifiers operate as simple buffers when in Track mode but freeze their outputs when placed into Hold mode Because all of the track and hold amplifiers in each SCXI 1140 module enter Hold mode at the same time they implement simultaneous sampling of all channels Simultaneous sampling is useful for preserving phase relationships between channels Track and hold amplifiers are subject to various imperfections which are listed in Appendix A Specifications The track and hold amplifiers on the SCXI 1140 exhibit a
131. pin DIN C connector connects the analog inputs to an optional terminal block A mating DIN C connector and shell are also available O National Instruments Corporation 1 1 SCXI 1140 User Manual Introduction Chapter 1 What Your Kit Should Contain The contents of the SCXI 1140 kit part number 776572 40 are listed as follows Kit Component Part Number SCXI 1140 Module 181705 01 SCXI 1140 User Manual 320410 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 1140 You can order separate software packages for controlling the SCXI 1140 from National Instruments When you combine the PC AT and MC data acquisition boards with the SCXI 1140 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 hi
132. pter E 13 SCXI 1350 multichassis adapter E 11 to E 12 SCXI 1140 User Manual Index SCXI 1351 one slot cable extender E 11 unpacking the SCXI 1140 1 4 INTR signal 3 5 C 3 J jumper settings analog configuration grounding and shielding jumper W12 2 6 input mode selection jumpers W1 through W8 2 6 output selection jumper W9 2 6 digital signal connections jumper W11 2 3 jumper W13 2 4 jumper W14 2 4 fixed jumpers 2 3 user configurable jumpers 2 3 L Lab NB Lab PC Lab PC Lab LC putting SCXI 1140 into Track or Hold mode 5 5 SCXI 1341 Lab NB Lab PC cable assembly E 4 to E 5 SCXI 1344 Lab LC cable assembly E 4 to E 5 LEVEL EDGE bit 4 4 Level Sensitive mode HOLDTRIG source 2 24 level sensitive hold trigger 5 3 Track and Hold control circuitry 3 9 TRIGI source 2 24 linearity adjustment 5 2 LOAD bit 4 8 M measurements See scanning measurements single channel measurements MIO boards Counter 1 and SCANDIV 5 11 data acquisition board setup programming 5 9 to 5 12 putting SCXI 1140 into Track or Hold mode using MIO 16 5 4 SCXI 1140 User Manual MISO signal connected by jumper W 14 2 4 definition of 3 5 C 3 synchronous communication link 3 6 MOD lt 3 0 gt bit 4 9 Module ID Register description of 4 2 digital control circuitry 3 7 procedure for reading 2 29 timing diagram 2 29 module programming See scanning measurements MOSI signal definition of 3 5 C 3 sync
133. r 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 Notation The instructions in this chapter use the following symbols to represent bits 0 binary zero 1 binary one X don t care either zero or one may be written C one of three bits used to specify the channel to be loaded into the output multiplexer This value will either be the channel to be read for single reads or a starting channel for scanned measurements H Hold Trigger routing control bits Instructions for these bits are explained in each section U User option bit Typically clear these bits to zero but see the register bit descriptions for more information 5 SCCT bits Usually all zeros for measurements and 00000001 for scans The 32 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 Communication Timing Requirements section in Chapter 2 Configuration and Installation The rear signal connector pin equivalences to National Instruments data acquisition boards are given in Table 4 1 See also Appendix E SCXI 1140 Cablin
134. r signal When this bit is set to one HOLDTRIG is not the Hold Trigger signal HOLDTRIG Output Enable Determines whether the Hold Trigger signal is driven onto the HOLDTRIG pins When you clear this bit to zero the Hold Trigger signal is not driven onto the HOLDTRIG pins When you set this bit to one the Hold Trigger signal is driven onto the HOLDTRIG pins unless HOLDTRIG is also selected as an input by HTRIGINEN TRIGI Input Enable Determines whether the inverse of SCXIbus TRIGI signal is selected as the Hold Trigger signal When you clear this bit to zero TRIGI is not selected as the Hold Trigger When you set this bit to one the inverse of TRIGI is selected as the Hold Trigger signal If HOLDTRIG is also selected as the Hold Trigger HOLDTRIG becomes the Hold Trigger signal TRIGI Output Enable Determines whether the inverse of the Hold Trigger signal is driven onto TRIGI When you clear this bit to zero the Hold Trigger signal is not driven onto TRIG1 When you set this bit to one the inverse of the Hold Trigger signal is driven onto TRIG1 unless TRIG1 has been selected as the Hold Trigger signal by TRIGIINEN Scanclock Output Enable Determines whether the rear signal connector SCANCLK signal is sent out in inverted form to the TRIGO signal If CLKOUTEN is set to one SCANCLK is transmitted on TRIGO If CLKOUTEN is cleared to zero SCANCLK is not transmitted on TRIGO 4 4 O National Instruments Corporat
135. ramming section of this chapter Perform the following steps given in your data acquisition board user manual 1 Enable the scanning data acquisition operation 2 Apply a trigger 3 Service the data acquisition operation Scanning Examples The following examples may aid your understanding of module and Slot 0 programming Referring to the bit descriptions for the Configuration Register and the FIFO Register at the beginning of this chapter is helpful Example 1 You want to scan channels 3 through 7 on an SCXI 1140 that is in Slot 1 of an SCXI 1000 chassis and is directly cabled to an AT MIO 16 data acquisition board Programming steps 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 00000001 00110000 00010000 00100101 to the Configuration Register of the SCXI 1140 in Slot 1 SCXI 1140 User Manual 5 18 O National Instruments Corporation Chapter 5 Programming 3 Follow the steps outlined in the section 3 Programming the Slot 0 Hardscan Circuitry earlier in this chapter in which step 3 Write the Slot 0 scan list to the FIFO consists of the following task Write 00000000 00000100 to the FIFO Register This corresponds to Slot 1 for five samples 4 Follow the procedure given in the Acquisition Enable Triggering and Servicing section earlier in this chapter Example 2a
136. re to average a few hundred readings After you have measured and recorded the offset remove the short circuits and reconnect the module Set the gain of the first module channel you want to calibrate to one At this gain most of the module offset is due to output offset The input offset adjustment has minimal effect Set the data acquisition board to read the channel Acquire the data averaging as in step 4 Adjust the output offset pot until the difference between the measured offset and the data acquisition board offset is close to zero There is no need to adjust it perfectly because the input offset adjustment in the next step might make a slight change in the measured gain of one offset Switch the gain of the same channel to 500 At this gain the input offset adjustment has the dominant effect Acquire the data and average as before Adjust the input offset pot until the difference between the measured offset and the data acquisition board offset is close to zero Again it is not necessary to adjust the input offset perfectly because there will be a slight interdependence between the two offsets Repeat step 5 adjusting the offset as carefully as desired Then repeat step 6 adjusting the offset as carefully as desired Switch back to a gain of one to ensure that the low gain offset is still calibrated If necessary repeat steps 5 and 6 until the offset is calibrated at both gains Repeat steps 5 through 7 for the additional channels y
137. rear connector a female front connector and a male chassis extender connector The rear connector attaches to a ribbon cable from the MIO board or a preceding chassis The front connector connects with the module rear signal connector The chassis extender connector connects 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 and also takes channels 0 through 6 on the chassis extender connector and maps them to channels I through 7 respectively on the rear connector O National Instruments Corporation E 11 SCXI 1140 User Manual SCXI 1140 Cabling Appendix E SCXI 1350 Installation Follow these steps to install the SCXI 1350 l E CE E EG Make sure that the computer and all of the SCXI chassis are turned off Insert all of the modules in all of the chassis Connect one end of a ribbon cable to the MIO board Connect the other end of the ribbon cable to the rear connector of the first SCXI 1350 Connect another ribbon cable or cable assembly to the chassis extender connector Plug the adapter board front connector to the module rear signal connector A corner of the adapter board enters the upper board guide of the chassis Screw the rear panel to the threaded strips in the rear of the chassis Connect the cable assembly to the desired module in the second chassis or if more than two chassis are being used connect the loose end
138. rm a direct measurement you must cable the SCXI 1140 rear signal connector to a data acquisition board and connect each output 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 1140 and the data acquisition board when calculating the actual voltage present at the input of the SCXI 1140 To measure one of the eight differential input channels to the SCXI 1140 perform the following steps 1 Write the binary pattern XXXXXXXX X000XXXX XOUUO000 00000000 to the SCXI 1140 Configuration Register Notice that this pattern can be the RESET state 2 Put the SCXI 1140 into Hold mode 3 Measure the voltage with the data acquisition board 4 If desired make other measurements quickly before the SCXI 1140 output voltage droops too much 5 Return the SCXI 1140 to Track mode Multiplexed Output To perform a direct measurement you must have the SCXI 1140 rear signal connector cabled to a data acquisition board Connect the Output signal to the data acquisition board analog input 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 accou
139. rs 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 31 for a 32 bit register bit 15 for a 16 bit register and 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 1140 Registers The SCXI 1140 has two registers The Module ID register is a four byte read only register that contains the Module ID number of the SCXI 1140 The Configuration Register is a 32 bit write only register that controls the functions and characteristics of the SCXI 1140 O National Instruments Corporation 4 1 SCXI 1140 User Manual Register Descriptions Chapter 4 Module ID Register The Module ID Register contains the four byte module ID code for the SCXI 1140 This code number is read as the first four bytes on the MISO line whenever the module is accessed The bytes appear least signific
140. s Tables Table 2 1 Dipital Jurtiper SEIN SS g s tt Dre dare Mr EN eee 2 5 Table 2 2 Input Mode Selection Jumpers 212 oid ide pee ovra benda ins 2 6 Table 2 3 Gain Switches for Each Channel 1o orto n ea erue eds 2 7 Table 2 4 Switch Settings for Gain Selection siae ertt wlio Secale 2 8 Table 2 5 SCXIbus to SCXI 1140 Rear Signal Connector to Data Acquisition Board Pin kj rere 2 22 Table 3 1 SCXIbus Equivalents for the Rear Signal Connector 3 6 Table 5 1 SCXI 1140 Rear Signal Connector Pin Equivalences sssss 5 2 Table 6 1 Calibration Component Identification esee ene 6 3 Table E 1 SCXI 1140 and MIO 16 Pinout Equivalences eene E 2 Table E 2 SCXI 1341 Pin Translations E 4 Table E 3 SCXD1342 Pin Trans ations in nn dea to eee e eo aero ee teer des E 6 Table E 4 SCXI T343 Pri COH COM suono nl ts E ne el a NU E 12 SCXI 1140 User Manual x National Instruments Corporation Chapter 1 Introduction This chapter describes the SCXI 1140 lists the contents of your SCXI 1140 kit describes the optional software optional equipment and custom cables and explains how to unpack the SCXI 1140 kit The SCXI 1140 is a class I module that operates as an eight channel simultaneously sampling differential input gain block The SCXI 1140 is an SCXIbus module for signal conditioning of high level and low lev
141. s Manual e Appendix F Revision A and B Photograph and Parts Locator Diagram contains a photograph of the Revision A and B SCXI 1140 signal conditioning module and the SCXI 1140 parts locator diagram e Appendix G Customer Communication contains forms you can use to request help from National Instruments or to comment on our products The Glossary contains an alphabetical list and description of terms used in this manual including abbreviations acronyms metric prefixes mnemonics and symbols The ndex contains an alphabetical list of key terms and topics used 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 DIO board italic Lab board MC MIO board monospace NB PC SCXIbus Slot 0 SCXI 1140 User Manual DIO board refers to the National Instruments AT DIO 32F MC DIO 24 MC DIO 32F NB DIO 24 NB DIO 96 NB DIO 32F PC DIO 24 and PC DIO 96 digital I O data acquisition boards unless otherwise noted Italic text denotes emphasis a cross reference or an introduction to a key concept Lab board refers to the National Instruments 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 National Instruments 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 multichannel I O dat
142. s and ratings for digital I O and timing lines 2 22 digital input configuration 2 14 digital interface 3 3 to 3 6 digital control circuitry 3 7 digital interface circuitry 3 3 SCXIbus connector 3 3 to 3 6 digital signal connections jumper W11 2 3 jumper W13 2 4 jumper W14 2 4 DIP switches for gain selection 2 7 to 2 8 direct measurements multiplexed output 5 6 parallel output 5 6 documentation conventions used in manual xi organization of xi related documentation xiii National Instruments Corporation E Edge Triggered Mode edge sensitive hold trigger 5 4 HOLDTRIG source 2 23 to 2 24 Track and Hold control circuitry 3 9 TRIG1 source 2 25 equipment optional 1 3 F fax technical support G 1 FIFO Register 4 9 floating AC coupled signal connection 2 14 floating signal connection 2 12 FOUTEN bit 4 5 front connector 2 9 to 2 17 analog input channels 2 11 to 2 14 floating AC coupled signal connection 2 13 floating signal connection 2 12 formulas for common mode input range 2 14 ground offset AC coupled signal connection 2 13 ground referenced AC coupled signal connection 2 13 ground referenced signal connection 2 12 warning against exceeding input ranges 2 14 cable connection 2 16 to 2 17 connector and shell 2 15 to 2 16 digital input 2 14 pin assignments 2 10 D 2 signal descriptions 2 11 D 3 terminal block 2 16 FRT bit 4 8 G gain adjustment 5 1 to 5 2 gain selectio
143. se are don t care bits 3 0 SL lt 3 0 gt Slot Bit 3 through 0 Determine which slot in the selected chassis is selected O National Instruments Corporation 4 7 SCXI 1140 User Manual Register Descriptions Chapter 4 Hardscan Control Register HSCR The HSCR contains eight bits that control the setup and operation of the hardscan timing circuitry of Slot 0 To write to the HSCR follow the procedure given in the Register Writes section using 13 as the slot number and writing eight bits to the HSCR The register shifts 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 FRT RD ONCE HSRS LOAD SCANCONEN CLKEN Bit Name Description 7 RSVD Reserved Should always be written to zero 6 FRT Forced Retransmit When cleared to zero reinitializes the scan list in the FIFO 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 to one it has no effect 5 RD Read When cleared to zero prevents the FIFO from being read When set to one the FIFO is read except at the end of a scan list entry during scanning when reading is briefly disabled to advance to the next entry 4 ONCE Once When set to one this bit shuts down the hardscan circuitry at the end of the scan list during a data acquisition When c
144. sis 0 O National Instruments Corporation 5 21 Programming SCXI 1140 User Manual Chapter 6 Calibration Procedures This chapter discusses the calibration procedures for the SCXI 1140 module Although hardware calibration is discussed in greater detail than software calibration software calibration is the preferred choice for the following reasons The calibration adjustments on the SCXI 1140 are inaccessible under most normal operating circumstances e With software calibration the module is calibrated in the exact environment in which it will be operating Software calibration compensates for system introduced in addition to module introduced errors You can perform software calibration fairly frequently which helps reduce drift effects Because module introduced errors are minimal with the SCXI 1140 the use of software rather than hardware calibration does not significantly reduce dynamic range The main penalty is reduction of throughput due to the increased processing time Notice that in many applications the SCXI 1140 factory hardware calibration is sufficient to meet accuracy requirements and no further calibration either hardware or software is needed Software Calibration Software calibration is very simple in concept Depending on your accuracy requirements you may want to perform only offset adjustment offset and gain adjustments or offset gain and linearity adjustments These are discussed in the followin
145. state If you want to control Track mode and Hold mode at the front signal connector set jumper W1 on the SCXI 1341 adapter board to position B to prevent a driver contention problem Using a PC LPM 16 Board Consult the Programming chapter in your PC LPM 16 User Manual for register locations and initialization procedures Before programming your module establish OUT2 HOLDTRIG low Write BO hex to the Counter Mode Register to put Counter 2 into mode 0 output low HOLDTRIG should now be low Check it on the HOLDTRIG pin of the front signal connector Now program your modules for single measurements Notice that you can use either Level Sensitive or Edge Triggered mode for the Hold Trigger signal Put the module s into Hold mode e Write B8 hex to the Counter Mode Register to put Counter 2 into mode 4 output high Alternate between the two lines to go between Track mode and Hold mode If you are using edge sensitive triggering you must assert SS to the module or hit the reset switch to put it back into Track mode before you create another rising edge on OUT2 O National Instruments Corporation 5 5 SCXI 1140 User Manual Programming Chapter 5 You cannot program the OUT2 pin to a high impedance state If you want to control Track mode and Hold mode at the front signal connector set jumper W1 on the SCXI 1342 adapter board to position B to prevent a driver contention problem Direct Measurements Parallel Output To perfo
146. sts of the multiplexer addressing circuitry and the track and hold control circuitry Configuration Analog l Register Section Track and Hold Control TRACK HOLD TRIGI TRIG4 Figure 3 4 SCXI 1140 Timing Control Circuitry Block Diagram National Instruments Corporation 3 7 SCXI 1140 User Manual Theory of Operation Chapter 3 Multiplexer Addressing The two output modes for the SCXI 1140 are Parallel mode and Multiplexed mode In Parallel mode set the output multiplexer to Channel 0 to disable scanning Thus all eight outputs become available simultaneously on the rear signal connector In Multiplexed mode only one output is used All eight channel outputs are multiplexed into the one board output that is under hardware control The SCXI 1140 powers up in Parallel mode To place the module in Parallel mode you must clear the SCAN FOUTEN and ABOEN bits in the Configuration Register You also must set CHAN lt 2 0 gt in the Configuration Register to 000 Clearing the SCAN bits prevents the channel multiplexer from scanning clearing the FOUTEN bit enables the multiplexer output clearing the ABOEN bit ensures that the multiplexer output is disconnected from the SCXIbus and setting CHAN lt 2 0 gt to 000 sets the multiplexer reload channel to 0 Because writing to the Configuration Register automatically loads the multiplexer with CHAN lt 2 0 gt Channel 0 will appear at the multiplexed output The other seven outputs are
147. t you should move jumpers W1 through W8 of the nonreferenced channels to position B C to create a DC path for the input bias currents If you do not do this the bias currents of the instrumentation amplifiers of the nonreferenced channels produce stray capacitances resulting in uncontrollable drift and possible saturation Figure 2 5 illustrates how to connect a ground referenced signal O National Instruments Corporation SCXI 1140 User Manual Configuration and Installation Chapter 2 SCXI 1140 Figure 2 5 Ground Referenced Signal Connection Figure 2 6 illustrates how to connect a floating signal SCXI 1140 Figure 2 6 Floating Signal Connection For AC coupled signals set jumpers W1 through W8 to position B C with an external resistor from the positive input channel connected to its negative ground Doing this creates the DC path for the positive input bias current Typical resistor values range from 100 kQ to 10 MO This solution although necessary in this case lowers the input impedance of the channel and introduces an additional offset voltage proportional to the product of the input bias current and the resistor value used The inputs of the SCXI 1140 have a typical bias current of about 100 pA When you use a I MQ resistor the result is 100 uV of offset which is insignificant in most applications However if you use larger valued bias resistors significant input offset may result Lower valued bias resistors will
148. t Counter I Mode Register 2 Write 0325 hex to the Am9513 Data Register to store Counter I Mode Value for most MIO boards Write 1325 hex to the Am9513 Data Register to store Counter 1 Mode Value for the AT MIO 16F 5 AT MIO 64F 5 and AT MIO 16X boards 3 Write FF09 to the Am9513 Command Register to select Counter 1 Load Register 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 Write FF41 to the Am9513 Command Register to load Counter 1 Write FFF1 to the Am9513 Command Register to step Counter 1 Write FF21 to the Am9513 Command Register to arm Counter 1 9o X Ow wi 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 1140 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 1140 for single module parallel scanning write the binary pattern XXXXXXXX X000XXXX XOUU0000 00000000 to the SCXI 1140 Configuration Register Notice that this can be the RESET state SCXI 1140 User Manual 5 12 O National Instruments Corporation Chapter 5 Programming Program the bits marked UU to 10 when you use an NB
149. t a feedthrough panel or more cable extenders SCXI 1351 Installation Follow these steps to install the SCXI 1351 1 Make sure that the computer and the SCXI chassis are turned off 2 Install the SCXI module in the chassis 3 Connect the rear connector of the cable extender to the breakout connector in the adjacent slot This attachment is similar to Step 3 in the SCXI 1180 Installation section as shown in Figure E 2 4 Plug the mounting bracket connector to the module rear signal connector An alignment tab on the bracket will enter the upper board guide of the chassis 5 Screw the mounting bracket to the threaded strips in the rear of the chassis Check the installation Multiple Chassis Connections for the SCXI 1140 The SCXI 1140 can operate in a multiple chassis system when you add the SCXI 1350 multichassis adapter You use the SCXI 1350 multichassis adapter to connect an additional SCXI 1001 chassis to the MIO 16 Using several SCXI 1350s you can connect up to eight chassis to a single MIO 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 When connecting multiple chassis you should use a 0 5 m length ribbon cable to minimize cable length and maintain signal integrity It is all right to use a 1 0 m cable from the MIO board to the first chassis SCXI 1350 Multichassis Adapter The adapter board has a male
150. t number 320380 01 e Lab NB User Manual part number 320174 01 e Lab PC User Manual part number 320205 01 e Lab PC User Manual part number 320502 01 e MC MIO 16 User Manual Revisions A to C part number 320130 01 e MC MIO 16 User Manual Revision D part number 320560 01 e NB MIO 16 User Manual part number 320295 01 e NB MIO 16X User Manual part number 320157 01 e PC LPM 16 User Manual part number 320287 01 e SCXI 1000 1001 User Manual part number 320423 01 Customer Communication National Instruments wants to receive your comments on our products and manuals We are interested in the applications you develop with our products and we want to help if you have problems with them To make it easy for you to contact us this manual contains comment and configuration forms for you to complete These forms are in Appendix G Customer Communication at the end of this manual O National Instruments Corporation xiii SCXI 1140 User Manual Contents About This M na slisse PST xi Oreanizationa This Mms saag xi Conventions Used in This Manual egenis use eite eos stein siens deerat xii Related Docume ntari Oma icc antes ager cece cases connate tas EE xiii Customer Communication serseri oes dense veces ann read iouf xiii Chapter 1 Introduction ED LE 1 1 What Your Kit Should Coning eid ENG QU B oases eee 1 2 Optional SANAE up SG 1 2 Optional Fqupme ss 1 3 COME DE va SG 1 4 peke gade SSG 1 4 Chapter 2 Configuration
151. ta Register e If the sample interval is 1 0000 hex 65 536 decimal write 0 to the Am9513A Data Register 3 Perform step 3 Program the Sample Counter as given in Chapter 4 of the NB MIO 16 User Manual Follow the instructions in these sections through the part called Clear the A D Circuitry and Reset the Mux Counter In the AT MIO 16X User Manual follow the instructions through the section called Program the Scan Interval Counter Do not continue to the part labeled Enable the Scanning Data Acquisition Operation Do this after you have programmed the modules and Slot 0 Note It is important that you follow the instructions in the interval channel scanning sections not the single channel sections Although you may be using only one MIO channel the channel scanning programming ensures that the MIO board outputs SCANCLK and HOLDTRIG which the SCXI 1140 and Slot 0 need When you program the MIO board for interval scanning you can also program Counter 2 for high impedance output provide your own HOLDTRIG signal and supply the MIO board with the OUT2 signal However you should allow sufficient time between OUT2 HOLDTRIG pulses for the MIO board to acquire all the data in the scan interval To program Counter 2 for high impedance instead of for operating as a scan interval counter substitute the following steps in place of the previously described Program the Scan Interval Counter section You cannot do this programming with an NB MIO 16
152. ta acquisition board On the SCXI 1140s that are in the other chassis and cabled to the data acquisition board set jumper W14 to position B C Notice that you will only be able to access digital information from the chassis that has the SCXI 1140 with jumper W 14 set to position A B On Revision C and later modules the SERDATOUT line is driven by an open collector driver which is 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 W13 and W14 in position A B factory default on the SCXI 1140 that is connected to the data acquisition board In this configuration jumper W13 connects the necessary pullup resistor to the SERDATOUT line and the module drives MISO to SERDATOUT When using multiple chassis leave jumper W14 in position A B on all of the SCXI 1140s that are cabled to the data acquisition board You should set jumper W 13 in position A B on only one it does not matter which one of the SCXI 1140s that are cabled to the data acquisition board Set jumper W 13 in position B C on all of the other SCXI 1140 modules that are cabled to the data acquisition board If too many pullup resistors are attached to the SERDATOUT line the drivers cannot drive the line low See Table 2 for a description and configuration of the jumper settings Table 2 1 Digital Jumper Settings Factory default setting connects MISO to SERDATOUT Parki
153. that has the connection to the data acquisition board to connect Analog Bus 0 to the board but not drive the Analog Bus 0 unless it is receiving an active low signal on SCANCON Program the module to send a SCANCLK compatible signal onto TRIGO If necessary program the module to send a HOLDTRIG compatible signal onto TRIG1 If this module is an SCXI 1140 write the binary pattern SSSSSSSS XCCCXXXX XOUUDDDD 10100111 to its Configuration Register The bits marked SSSSSSSS should be programmed to 00000001 unless you want to acquire the same data from the SCXI 1140 several times Program the bits marked UU to 10 when you use an NB MIO 16 board and to 01 when you use any other MIO 16 board If you are using your own data acquisition scheme program these bits appropriately D as follows CO Program the four bits marked DD e Ifthe Hold Trigger signal comes from the data acquisition board or will be connected to the HOLDTRIG pin on the SCXI 1140 front connector and any of the other modules need the Hold Trigger signal program the four bits as 0001 This makes the SCXI 1140 receive the Hold Trigger signal from the HOLDTRIG pin front or rear and send the inverted Hold Trigger signal on the SCXIbus TRIGI line Ifthe Hold Trigger signal comes from the data acquisition board or will be connected to the HOLDTRIG pin on the SCXI 1140 front connector and no other module needs the Hold Trigger signal program the four bits
154. 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 as shown in Figure E 1 An alignment tab on the bracket enters the upper board guide of the chassis SCXI 1140 User Manual E 2 O National Instruments Corporation Appendix E SCXI 1140 Cabling 4 Screw the mounting bracket to the threaded strips in the rear of the chassis 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 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 r4 Step 4 50 Pin Female Connector to MIO 16 Board IIS SSSR Step 4 Male Breakout Connector SCXI 1140 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 1140 module The SCXI 1344 Lab LC cable assembly connects a Lab LC board to an SCXI 1140 module The SCXI
155. the digital lines of the Lab boards and the PC LPM 16 board respectively Table 2 5 lists the equivalences For more information consult Appendix E SCXI 1140 Cabling O National Instruments Corporation 2 21 SCXI 1140 User Manual Configuration and Installation Chapter 2 Table 2 5 SCXIbus to SCXI 1140 Rear Signal Connector to Data Acquisition Board Pin Equivalences SCXIbus Line SCXI 1140 Lab NB PC LPM 16 Rear Signal Lab PC Connector Lab PC Lab LC SERDATIN ADIOO DAQD A ADIOI SLOTOSEL ADIO2 SERCLK EXTSTROBE SERDATOUT BDIOO The digital timing signals are pins 36 39 43 and 46 e Pin 36 is SCANCLK and you use it as a clock for the SCXI 1140 multiplexer counter The data acquisition board should pulse this signal at the end of each conversion if the module is in Scan mode e Pin 39 is TRACK HOLD which you can use to gate or trigger conversions on the data acquisition board Enable pin 39 through the Module Configuration Register See Chapter 5 Programming for more information Pin43isareserved digital input e Pin 46 is HOLDTRIG which you can use to place the module into Hold mode See Chapter 3 Theory of Operation and Chapter 5 Programming for more information The following specifications and ratings apply to the digital I O and timing lines Absolute maximum voltage Input rating 0 5 to 5 5 V with respect to DIG GND Digital input specifications referenced to DIG GND Vin input logic high voltage 2 V
156. try The SCXIbus provides analog power 18 5 VDC minimum which the SCXI 1140 regulates to 15 VDC a chassis ground CHSGND and an analog bus ABO with a guard ABO buses the SCXI 1140 output to other modules via the SCXIbus The guard guards the analog bus and you can connect it via jumper W12 to the chassis ground to the data acquisition board input ground AIGND or leave floating for example if you make the connection on another board Figure 3 6 illustrates the analog circuitry Input Protection 5 Q Q o E S Q a S ob E n g a Rear Signal Connector Input Protection Figure 3 6 SCXI 1140 Analog Circuitry The analog input circuitry consists of eight channels with DIP switch programmable instrumentation amplifiers followed by buffered track and hold amplifiers an eight to one multiplexer and output switches In addition you can include the voltage regulation circuitry and input protection in the analog section Each block is described in the following paragraphs The first block an incoming analog signal encounters is the input protection The input protection consists of a I kQ resistor in series with each input line followed by low leakage diodes to the supply rails 15 V Each input terminal is protected against input voltages up to 15 V powered off and 30 V powered on SCXI 1140 User Manual 3 10 O National Instruments Corporation Chapter 3 Theory of Operation Next in the signal
157. u 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 Index Numbers Symbols 5 V signal 3 5 C 3 A A24 signal 3 6 C 4 ABO signal 3 5 C 3 ABO signal 3 5 C 3 ABOEN bit 4 5 AC specifications A 2 AGND GUARD signal 2 18 B 2 AGND NC signal 2 18 B 2 AGND signal front connector 2 11 E 3 rear signal connector 2 19 B 2 analog circuitry illustration 3 10 theory of operation 3 10 to 3 11 analog configuration gain selection 2 7 to 2 8 grounding and shielding jumper W12 2 6 input mode selection jumpers W1 through W8 2 6 output selection jumper W9 2 6 analog input channels floating AC coupled signal connection 2 13 floating signal connection 2 12 formulas for common mode input range 2 14 ground offset AC coupled signal connection 2 13 ground referenced AC coupled signal connection 2 13 ground referenced signal connection 2 12 warning against exceeding input ranges 2 14 analog output signal connections 2 20 to 2 21 AOUT through AOUT signals 2 19 B 2 O National Instruments Corporation Index 1 B bit descriptions ABOEN 4 5 CHAN lt 2 0 gt 4 3 CHS lt 4 0 gt 4
158. us AT MIO 16 D User Manual Multiple A D Conversions with Continuous Channel Scanning Round Robin Multiple A D Conversions with Interval Channel Scanning Pseudosimultaneous AT MIO 16F 5 User Manual Posttrigger Data Acquisition with Interval Channel Scanning AT MIO 16X User Manual Interval Channel Scanning Data Acquisition AT MIO 64F 5 User Manual Continuous Channel Scanning Data Acquisition Interval Channel Scanning Data Acquisition MC MIO 16 User Manual Multiple A D Conversions with Interval Channel Scanning Pseudosimultaneous NB MIO 16X User Manual Multiple A D Conversions with Interval Channel Scanning Pseudosimultaneous NB MIO 16 User Manual Programming Multiple A D Conversions with Channel Scanning Follow the instructions in this section with the following changes 1 Perform step I Set up the analog channel and gain selection sequence Add the following instructions Program the Scan Interval Counter Counter 2 of the Am9513A Counter Timer is programmed to create a square wave in which the high time of the square wave corresponds to the total time needed to take all samples in one scan interval and the sum of the high time and the low time is the time of the scan interval The timebase for the Scan Interval Counter must be the same as the timebase used for the sample interval counter The SCXI 1140 operates in Level Sensitive mode when used with the NB MIO 16 O National Instruments Corporation
159. us Connector O National Instruments Corporation C 1 SCXI 1140 User Manual SCXIbus Connector Appendix C SCXIbus Connector Signal Descriptions Pin Signal Name Description 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 Al BI C1 D1 GUARD Guard Shields guards the analog bus lines from noise A2 B2 C2 D2 A3 B3 C3 D3 A5 B5 C5 Ds A4 D4 A6 D6 C13 C17 CHSGND Chassis Ground Digital and analog ground reference A21 B21 C21 D21 A13 TRIG4 TRIG4 Reserved Open collector 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 in Slot 0 Open collector Output A20 B20 C20 V Negative Analog Supply 18 5 to 25 V D20 A22 B22 C22 V Positive Analog Supply 18 5 to 25 V D22 A23 D23 5 V 5 VDC Source Digital power supply B23 SPICLK Serial Peripheral Interface SPI Clock
160. uts of all eight channels appear here in sequence Outputs from other modules can also appear here through the analog bus In Nonscanning mode OUTPUT is the output of Channel 0 Output Reference Connects to the module analog ground unless an output from another module is selected through the analog bus in which case the pins connect to the analog ground for the selected module Analog Outputs Outputs of channels 1 through 7 independent of whether or not scanning is enabled Analog Ground Connect to the module analog ground They are used as the reference points for AOUT I through AOUT7 Analog Ground No Connect Connect to the module analog ground when jumper W9 is in position B C When the jumper is in position A B this pin is unconnected Digital Ground Supply the reference for data acquisition digital signals and are tied to the module digital ground Serial Data In Taps into the SCXIbus MOSI line to send serial input data to a module or Slot 0 Serial Data Out Taps into the SCXIbus MISO line to accept serial output data from a module if jumper W14 is in position A B Otherwise it is unconnected 2 19 SCXI 1140 User Manual Configuration and Installation Chapter 2 Pin Signal Name Description continued 21 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 43
161. y illustration of 3 7 multiplexer addressing 3 8 timing signals 2 23 to 2 25 digital timing signals 2 22 Edge Triggered Mode HOLDTRIG source 2 23 to 2 24 TRIG1 source 2 25 HOLDTRIG timing requirements 2 23 Level Sensitive mode HOLDTRIG source 2 23 TRIG1 source 2 24 SCANCLK timing requirements 2 22 Track and Hold modes control circuitry 3 9 edge sensitive hold trigger 5 3 level sensitive hold trigger 5 3 overview 5 3 putting SCXI 1140 into Track or Hold mode 5 4 to 5 5 Lab NB Lab PC Lab PC Lab LC 5 5 MIO 16 5 4 PC LPM 16 5 5 TRACK HOLD signal definition of 2 20 B 3 digital timing 2 22 Level Sensitive mode 2 24 Track and Hold control circuitry 3 9 TRACK HOLDEN bit 4 4 TRIGO signal 5 13 to 5 16 TRIGI signal C 4 definition of 3 6 Edge Triggered Mode 2 24 Level Sensitive mode 2 24 module programming 5 13 to 5 16 Track and Hold control circuitry 3 9 TRIGIINEN bit 4 4 TRIGIOUTEN bit 4 4 TRIG2 signal 3 5 C 3 TRIG3 signal 3 5 C 3 TRIG4 signal 3 5 C 3 U unpacking the SCXI 1140 1 4 V V signal 3 5 C 3 V signal 3 5 C 3 O National Instruments Corporation Glossary ACH A D AWG CH CH c s D A dB DIN DIP FIFO hex HSCR Hz ID in I Iin I O Tout LSB MB MCH MCH MSB MTS degrees ohms amperes data acquisition board analog input channel number analog to digital American Wire Gauge Celsius module positive input channel number modu
162. y warranty National Instruments 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 reason

SCXI-1140 User Manual - National Instruments

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