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1. Re IFFT X is the real valued part of the output sequence Im IFFT X is the imaginary valued part of the output sequence a E E Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 9 4 Hilbert transform 8 Hi HLB ix UE error UEI Hilbert The Hilbert transform function UEI Hilbert computes the fast Hilbert transform of an input sequence Note that 1f the length of the input is not a power of two then it is truncated to the next lowest power of 2 If this is undesirable then the Zero Pad VI can be used to pad out the sequence to the next higher power of 2 per X is the input sequence 44 Signal Processing VIs HLB X is the output sequence Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 9 5 Inverse Hilbert transform 6 IHLB x UE error UEI Inverse Hilbert The Inverse Hilbert transform function UEI Inverse Hilbert computes the inverse fast Hilbert transform of an input sequence Note that if the length of the input is not a power of two then it is truncated to the next lowest power of 2 If this is undesirable then the Zero Pad VI can be used to pad out the sequence to the next higher power of 2 per X is the input sequence THLB X is the output sequence Error contains the VI error code Negative values indicate an error See the secti
2. 1 2 2 4 UEI 30DS The UEI 30DS is a development of the UEI 30D and is identical in operation and capabilities to the UEI 30D except for the addition of simultaneous sample and hold operation on all 16 input channels The available analog input ranges of the UEI 30DS have also been modified to support this capability 1 2 2 5 UEI 30DS 4 The UEI 30DS 4 is a low cost version of the UEI 30DS with only four simultaneously sampled input channels In all other respects it is identical to the UEI 30DS 2 Getting started 1 2 2 6 UEI 30PG The UEI 30PGL and UEI 30PGH are essentially the same as the UEI 30D but feature programmable gain The UEI 30PGL has gains of 1 10 100 and 1000 while the UEI 30PGH has gains of 1 2 4 and 8 available 1 2 2 7 UEI 126 The UEI 126 is a low cost very high performance board intended for use primarily in laptop PCs It features 16 single ended analog inputs two analog outputs 8 digital inputs 8 digital outputs and a programmable clock Maximum throughput is 50 kHz 1 2 2 8 UEI 127 The is a low cost very high performance simultaneous sampling board intended for use primarily in laptop PCs It features 4 single ended simultaneously sampled analog inputs two analog outputs 8 digital inputs 8 digital outputs and a programmable clock Maximum throughput is 100 kHz 1 2 3 32 bit series boards The 32 bit series of boards consists of eight boards All 32 bit series boards are supported in PC PC
3. Clock Mode selects whether the A D clock is derived from the internal clock or is supplied externally for those boards that support software programmable clock sources The default setting is internal The following values are supported O Internal 1 External Sampling Period Out is the actual time between clock pulses Note that may not be exactly what would be expected from the Sampling Rate In control as data acquisition boards can generally select sampling periods only in finite sized steps Buffer descriptor provides information to the AD Check and AD Close VIs You must not modify this information in any way Task Id out is the Task Id corresponding to the board This must be used in all subsequent I O operations Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 5 4 AD Check Task Id In Buffer Descriptor Task ld Dut Buffer Descriptor AD Check AD Check checks for the completion of an waveform input operation started by the AD Wave In VI Task Id in is the Task Id corresponding to the board This must be obtained from the AD Wave In VI There is no default for this control Buffer descriptor provides status information from the AD Wave In VI You must not modify this information in any way The Buffer descriptor output should be wired to the AD Close function Task Id out is the Task Id corresponding to the board This must be used in
4. E B Utility VIs Task Id 1 Out is the Task Id corresponding to the first execution path to be synchronized Once this task ID emerges all input paths to the VI have completed Task Id 2 Out is the Task Id corresponding to the second execution path to be synchronized Once this task ID emerges all input paths to the VI have completed Task Id 3 Out is the Task Id corresponding to the third execution path to be synchronized Once this task ID emerges all input paths to the VI have completed Task Id 4 Out is the Task Id corresponding to the fourth execution path to be synchronized Once this task ID emerges all input paths to the VI have completed 41 Chapter 9 9 Signal processing VIs The various signal processing VIs perform various analysis functions such as frequency domain transforms on acquired data 9 1 Signal processing introduction The available signal processing functions are e FFT performs a Fast Fourier Transform e Inverse FFT performs an inverse Fast Fourier Transform e Hilbert transform performs a Fast Hilbert Transform e Jnyerse Hilbert transform performs an inverse Fast Hilbert Transform e Chirp Z transform Performs a Chirp Z transform e Convolution computes the convolution of two signals e Zero pad Pads a waveform with zeros such that the waveform length is a power of two 9 2 FFT Reix Re FFTIX Imi FO Im FFT error UEI FFT The FFT function UEI FFT computes th
5. Filtered Data is the filtered sequence Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these Filter VIs Filter VIs 63 Index AD Chan In 23 AD channel configure 10 17 AD Check 25 AD Close to Integer 26 AD Easy Wave 21 AD Wave In 24 Analog input 9 Analog output 10 Analog output boards 4 Analog output VIs 29 Analysis 9 Arrays of channels 11 Blackman Harris window 43 Channel addressing 11 Chirp Z 37 47 49 Chirp Z spectrum analysis 49 Configuration 5 10 Configure Board 10 Configure board 15 Convolution 38 DA Chan Out 29 DA channel configure 10 18 Data acquisition 9 Data acquisition boards 9 Index Data analysis 9 Digital I O 10 Digital I O boards 4 Digital VO VIs 31 DIO port configure 11 19 DIO Port In 31 DIO Port Out 32 Directories 7 DLL 5 7 DMA 2 10 Driver 6 Dynamic Linked Library 5 Easy VO 21 Enhanced mode 4 7 Error codes 12 FFT 35 Filter VIs 51 FIR coefficients 52 FIR Filter 54 FIR filter 51 FIR filters 41 FIR Windowed coefficients 53 Fourier Transform 35 Hamming window 42 65 66 Hanning window 42 Hilbert transform 36 Installation 6 Interrupt 2 Interrupts 10 Inverse FFT 36 Inverse Hilbert transform 37 Linear Chirp Z Spectrum 47 Linear Spectrum 46 Multi tasking 10 Name 9 Noise floor 43 Old series 1 P
6. a AD Channel Configure This configures a range of A D input channels You can use several of these VIs in series to configure different channels differently You can also configure a channel in a particular way perform an input function and then reconfigure the channel for a different function b wm DA Channel Configure This configures a range of D A output channels You can use several of these VIs in series to configure different channels differently You can also configure a channel in a particular way perform an output function and then reconfigure the channel for a different function c DIO Port Configure This configures a range of digital I O ports You can use several of these VIs in series to configure different ports differently You can also configure a port in a particular way perform a digital V O function and then reconfigure the port for a different function iii Once a Task Id has been originated by the Configure Board VI and processed by one of the subsystem configuration VIs you can perform any of the analog input analog output or digital I O functions 10 Using the VIs 2 5 Multiple execution paths When data acquisition functions are connected in series as shown above then the functions execute serially a specific function cannot execute until the previous function has completed Sometimes it can be useful to allow data acquisition functions to execute in parallel This can be done as follows CON
7. DA Easy Wave This is a high level easy to use way to output an analog waveform 2 8 3 Analog input functions e AD Chan In Acquires a single sample from each of a group of channels e _ AD Wave In Low level analog input function Starts a waveform acquisition process e AD Check Low level analog input function Checks to see whether a waveform acquisition started by AD Wave In has completed e AD Close To Integer Low level analog input function Completes a waveform input function started by AD Wave In The output from the function is an array of integer data e AD Close To Single Low level analog input function Completes a waveform input function started by AD Wave In The output from the function is an array of single precision floating point data 2 8 4 Analog Output functions e DA Chan Out This outputs a specified voltage on a group of analog output channels e DA Wave Out Low level analog output function Starts a waveform output process e DA Check Low level analog input function Checks to see whether a waveform output operation started by DA Wave Out has completed e DA Close Low level analog output function Completes a waveform output function started by DA Wave Out 2 8 5 Digital I O functions e DIO Port In This inputs digital data from a group of digital input ports e DIO Port Out This outputs digital data to a group of digital output ports 2 8 6 Utility functions Software Trigger This f
8. Id out is the Task Id corresponding to the board This must be used in all subsequent I O operations E E Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 4 3 AD Trig Wave String Channel Array es WAVE E Data Out Samples per Channel pa Sampling Period Out Sampling Rate In Status Block Mode Level Position AD Trig Wave performs timed multi channel input operations with analog triggering You can specify which channels to sample how often to sample them and how many samples to obtain The output data is scaled to the range and gain of the selected channels This function uses internal triggering and clocks Analog triggering is simulated by acquiring three times more data that is required looking for a trigger condition and then discarding data prior to the trigger condition Depending on the Mode setting the VI can either wait for a valid trigger or return immediately whether or not a valid trigger was found Note that because this VI simulates analog triggering it is possible that it will miss single shot events Thus it should be used only on repetitive waveforms 22 Easy VIs E E E TF TF TF E H E E E Easy VIs Task Id in is the Task Id corresponding to the board This must be obtained from the AD Chan Configure VI There is no default for this control Channel list is a list of the channels that are to be sampled Thi
9. Single closes a data acquisition operation started by AD Wave In The output of this function is an array of floating point values The size of this array will be twice that of an array of integer values For a version of this function that outputs integer values see the AD Close To Integer VI Task Id in is the Task Id corresponding to the board This must be obtained from the AD Wave In VI or P 8 AD Check VI There is no default for this control Buffer descriptor provides status information from the AD Wave In and AD Check VIs You must not modify this information in any way Task Id out is the Task Id corresponding to the board This must be used in all subsequent I O operations 30 Analog In VIs Float Results is a two dimensional array of output data Its size is the product of the number of channels and the number of samples It is scaled to the range and gain selected by the AD Chan Configure VI that preceded the AD Wave in operation Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these Analog In VIs 31 Chapter 6 6 Analog Output functions This chapter provides a description of the various analog output VIs used by the driver 6 1 Analog output VI introduction The analog output VIs are e DA Chan Out This outputs a specified voltage on a group of analog output channels e DA Wave Out Low level analog output function Starts a waveform outp
10. a the data to be searched Note that this is a one dimensional array g El Slope is the slope of the trigger event to be searched for If this is true then a positive slope is searched for and if it is false a negative slope Mode is the trigger mode If this is false then a found will always return true regardless of whether a valid trigger was found This is equivalent of Auto triggering on an oscilloscope data will always be displayed If it is true found will only return true if a valid trigger condition was found Level sets the level at which the trigger condition will occur Trigger Point represents the offset into the data buffer at which the specified trigger condition occurred If no trigger occurred and Mode was false then this will return 0 Found is set if either a valid trigger condition occurred or mode was false 4 4 DA Easy Wave Task Id Out Sampling Period Out Status String Channel Array Sampling Rate In Data In DA Easy Wave performs timed multi channel output operations You can specify which output channels to update how often to update them and how many times the output data is to be repeated to obtain The output data is scaled to the range and gain of the selected channels This function uses internal triggering and clocks B Task Id in is the Task Id corresponding to the board This must be obtained from the DA Chan Configure VI There is no default for this control Channel l
11. applications Windows VIs 49 must be truncated This results in a problem very similar to that discussed above but known as Gibb s phenomenon Once again smoothing windows can reduce this effect Note that all of these window functions are normalized for operation as smoothing functions for use in spectrum analysis systems They are scaled to compensate for power loss When used for filter design they must be scaled back to unity gain See the FIR window coefficients VI for an example of how to do this 10 2 Hamming window Hamming Ham UE error Hamming Window This function applies a Hamming window to the input sequence Note This window is normalized to preserve the average power in the input waveform It must be scaled for use in filter design pet X is the data to be windowed Ham X is the windowed data El 5 Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 10 3 Hanning window lt a Hanning Window This function applies a Hanning window to the input sequence Note This window is normalized to preserve the average power in the input waveform It must be scaled for use in filter design par X is the data to be windowed Han X is the windowed data Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 50 Windows VIs 10 4 Blackm
12. configured for If these do not correspond then voltage readings from subsequent functions will be incorrect The default setting for this control is 5 to 5V Range may be one of the following values 0 5 to 5V 1 0to 5V 2 10to 10V 3 0to 10V 4 2 5 to 2 5V Configuration VIs 17 5 0to 2 5V Mode indicates the input mode Default setting is single ended Possible values are 0 Single ended 1 Differential Gain list is a list of the gains that the various channels in the channel list are to be set to for example 10 or 1000 If this list is shorter than the channel list it wraps round If it is longer than the channel list extra values are ignored Default setting is 1 Note that these values are the actual gain values NOT gain codes as used by UEIDAQ Task Id out is the Task Id corresponding to the board This must be used in all subsequent analog input subsystem VIs Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 3 4 DA Chan Configure Task Id In Channel List oe CHEN Task Id Out LEI Status DA Chan Config DA channel configure configures a range of D A output channels for range and mode E 18 Task Id in is the Task Id corresponding to the board This must be obtained from the Configure Board VI There is no default for this control Channel list is a list of the channels that are to be configured To convert fro
13. default level a setting of 3 is used for boards that use 8 bit DMA and a setting of 5 for boards that use 16 bit DMA Secondary DMA is the secondary DMA channel for those boards that support dual channel gap free DMA For boards that do not support software configuration of DMA levels this should be set to correspond to the DMA level for which your board has been configured In the case of boards that do support software configuration of DMA levels the board will be set to this DMA level Consult your hardware manual for a discussion of the appropriate DMA level for your application If this control is set to 1 the default level a setting of 0 is used for boards that use 8 bit DMA and a setting of 6 for boards that use 16 bit DMA Configuration VIs Interrupt Level is the interrupt level IRQ setting for the board For boards that do not support software configuration of interrupt levels this should be set to correspond to the interrupt level for which your board has been configured In the case of boards that do support software configuration of interrupt levels the board will be set to this interrupt level Consult your hardware manual for a discussion of the appropriate interrupt level for your application If this control is set to 1 the default level the interrupt level will be set to the factory default for type of board identified or to IRQ5 for boards that are software programmable Task Id is the Task Id corresponding to the boar
14. error codes for more information on these 36 Analog Out VIs Chapter 7 7 Digital VO functions This chapter provides a description of the various digital I O VIs used by the driver 7 1 Digital I O VI introduction The digital I O VIs are e DIO Port In This inputs digital data from a group of digital input ports e DIO Port Out This outputs digital data to a group of digital output ports 7 2 DIO Port In Task Id In IA Task Id Out IN Data Port List uel Status DIO Port In DIO Port In obtains a single sample from each of the specified digital input ports Task Id in is the Task Id corresponding to the board This must be obtained from the DIO Port Configure VI There is no default for this control 116 Port list is a list of the ports that are to be sampled To convert from a string format channel list to the integer format required by this function use the String To Int Chan List VI The default setting is 0 Data is a one dimensional array of integer format output data Data is in the same order as is the port list For information on data encoding consult your hardware reference manual Task Id out is the Task Id corresponding to the board Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these Digital I O VIs 37 7 3 DIO Port Out Task ld In Port List Data PORT Task Id Out OUT UEI Status DIO Port Out DIO Port Out
15. number of channels Note that regardless of whether block mode is selected or not this rate is still the rate at which each channel is sampled The default sampling rate is 1 kHz Block mode selects whether samples are taken in normal or block mode for those boards that support this Because of the way that the sampling rate is interpreted by the VI this setting has no effect on the rate at which channels are sampled It does have an effect on the phase of the samples If block mode is true then the phase shift between samples taken on the same scan through the channel list will be as small as the board can make it For simultaneous sampling boards this will be 0 and for other boards equal to 1 Maximum throughput If block mode is false then samples taken on the same scan through the channel list will be evenly spread through the sampling interval For more information on block mode sampling see your hardware manual Data Out is a two dimensional array of output data Its size is the product of the number of channels and the number of samples It is scaled to the range and gain selected by the AD Chan Configure VI that preceded the AD Easy Wave operation E Sampling Period Out is the actual period between successive conversions on the same input channel Note that this may not be exactly what would be expected from the Sampling Rate In control as data acquisition boards can generally select sampling periods in finite sized steps Task
16. of 2 If it is not the sequence will be truncated If this is undesirable then the Zero Pad VI can be used to pad out the sequence to the next higher power of 2 per X is the input sequence Power Spectrum is the power spectrum Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 11 3 Linear Spectrum Y ASTON Linear Spectrum er error UEI Linear Spectrum Linear Spectrum UEI Linear Spectrum computes the two sided linear spectrum of an input sequence If the input sequence is expressed in volts then the output sequence represents volts This is calculated by taking the square root of the power sequence above The size of the input sequence must be a power of 2 If it is not the sequence will be truncated If this is undesirable then the Zero Pad VI can be used to pad out the sequence to the next higher power of 2 per X is the input sequence Linear Spectrum is the linear spectrum Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 11 4 Power Chirp Z Spectrum x ASIAN Power Spectrum Start CHP 2 F End EL error UEI Chp Z Power Spectrum Power Chirp Z Spectrum UEI Power Chirp Z Spectrum computes the power spectrum of an input sequence The Chirp Z transform is similar to the FFT process used by the Power Spectrum VI but where the FFT always converts to 54 Spec
17. ports that are to be configured To convert from a string format channel list to the integer format required by this function use the String To Int Chan List VI The default setting is 1 which selects all ports on the board Latch Mode indicates the input latch mode This is currently unused and should be left unconnected P y Direction indicates whether the port is to be an input or an output This is ignored for board with fixed DIO P P P 8 port configuration The default value is for the ports to be inputs Values are 0 Output 1 Input Task Id out is the Task Id corresponding to the board This must be used in all subsequent digital I O subsystem VIs Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 3 6 Version Version Version Configuration VIs 19 Returns the version number of the UEIDAQ DLL that is installed on your system Version returns the UEIDAQ version number encoded with the minor version number in the lower 8 bits and the major version number in the next highest 8 bits 20 Configuration VIs Chapter 4 4 Easy I O functions This chapter provides a description of the various Easy I O VIs used by the driver 4 1 Easy I O VI introduction Easy I O VIs are simplified versions of the more advanced but also more complex low level VIs As they are constructed out of low level VIs you can use these VIs as to learn how to
18. program to run vi Press the enter key vii The setup program will then run Answer any questions that it asks 1 6 Driver structure The UEIDAQ driver system is structured as shown in figure 1 1 below LabVIEW LAS A UEIDAQ for LabVIEW VI s Other Windows Programs UEIDAQ DLL Dynamic Link Library UEIDAQV 386 Data Acquisition Board Virtual Device Driver Figure 1 1 Driver structure There are three components to the UEIDAQ for LabVIEW drivers 6 Getting started e The UEIDAQ LabVIEW O VIs These VIs are the part of the driver system that is visible to LabVIEW You create your application by interconnecting these VIs in LabVIEW In essence the VIs are high level wrappers for calls to the UEIDAQ DLL e The UEIDAQ DLL All I O requests for any UEI board under Windows 3 1 go via this DLL It serves to synchronize all driver activity and allows full multi tasking e The UEIDAQV virtual device driver This driver handles all high speed I O operations as well as providing access Ring 0 access to the DLL 1 6 1 Driver Requirements Windows support is provided as follows i Windows 3 1 enhanced mode only is supported Operation under Windows 3 or earlier or in Windows 3 1 standard mode is not possible ii A minimum configuration of a 386 processor and 4 MBytes of memory is required A 386DX or 486 processor and 8 Mbytes of memory are recommended iii Windows 3 1 support is viaa DLL Dynamic Lin
19. the single sided spectrum of a waveform in a format suitable for display in a graph Output can be in voltage power or dB s and a smoothing window can be specified Chirp Z Spectrum Analysis This VI computes the spectrum of a waveform over a specified frequency interval in a format suitable for display in a graph Output can be in voltage power or dB s and a smoothing window can be specified It should be noted that all of these functions are only capable of estimating the spectral content of a signal For example what were single spectral components in a continuous signal may be spread into multiple frequency bins by the sampling process This is the so called scalloping loss or picket fence effect Effects of this loss can vary from nothing to a window dependent maximum which can be from 4 dB no window to 0 83 dB 4 term Blackman Harris For more information see for example Digital Signal Processing A V Oppenheim R W Schafer Prentice Hall 1975 and On the Use of Windows for Harmonic Analysis with the Discrete Fourier Transform F J Harris Proc IEEE Vol 66 No 1 January 1978 Spectrum Analysis VIs 53 11 2 Power Spectrum Power Spectrum x POWER UEI error UEI Power Spectrum Power Spectrum UEI Power Spectrum computes the two sided power spectrum of an input sequence If the input sequence is expressed in volts then the output sequence represents power into 1 Ohm The size of the input sequence must be a power
20. use the low level VIs or as starting points for your own VIs The Easy I O VIs are e AD Easy Wave This is a high level easy to use way to acquire an analog waveform e AD Trig Wave This is a high level easy to use way to acquire an analog waveform with analog triggering e DA Easy Wave This is a high level easy to use way to output an analog waveform 4 2 AD Easy Wave Block Mode ARENA Task IdIn ene Task Id Out String Channel Array 220021 wave E Data Out Samples per Channel LEI Sampling Period Out ampling Rate In Status AD Easy Wave AD Easy Wave performs timed multi channel input operations You can specify which channels to sample how often to sample them and how many samples to obtain The output data is scaled to the range and gain of the selected channels This function uses internal triggering and clocks Task Id in is the Task Id corresponding to the board This must be obtained from the AD Chan Configure VI There is no default for this control Channel list is a list of the channels that are to be sampled This is in string format For a discussion of this format see the section on channel addressing The default setting is channel 0 Easy VIs 21 Samples per channel is the number of samples to be taken for each channel in the channel list the default is 1024 Sampling rate in is the rate at which each channel individually will be sampled Board throughput is the product of the sampling rate and the
21. writes a single value to each of the specified DIO ports El AE 38 Task Id in is the Task Id corresponding to the board This must be obtained from the DIO Port Configure VI There is no default for this control Port list is a list of the ports to which data is to be written To convert from a string format channel list to the integer format required by this function use the String To Int Chan List VI The default setting is 0 Data is a one dimensional array of integer format data to be written Each integer value represents the data for a single port Data is in the same order as is the port list For information on data encoding consult your hardware reference manual Task Id out is the Task Id corresponding to the board Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these Digital VO VIs Chapter 8 8 Utility functions This chapter provides a description of the various utility VIs provided by the driver 8 1 Utility VI introduction The utility VIs are Software Trigger This function emulates the operation of a oscilloscope style analog trigger operation on a buffer with data in it String To Int Chan List This function converts a list of channels in string format to the integer array format required by most of the data acquisition functions Synchronize This function synchronizes the execution of multiple paths of
22. 19 10080 10402 10403 10444 10600 10805 10840 20008 20021 20023 No Error Bad board normally caused by an error in an earlier VI Input parameters out of range Operation requiring the requested subsystem is already in progress Multi tasking error usually caused by a bad device number Channel number out of range Clock frequency was invalid Gain setting invalid Device not found Invalid parameters the operation was not attempted Insufficient memory Subsystem or board has not been configured Hardware error an error occurred during an I O operation to a board Unknown error probably as the result of a version conflict Array sizes are invalid Filter size must be greater than 1 Cutoff frequencies were invalid 2 8 Quick reference The data acquisition VIs in the UEIDAQ library include 2 8 1 Configuration functions 12 Configure Board Configures a board AD Chan Config Configures a range of analog input channels DA Chan Config Configures a range of analog output channels DIO Port Config Configures a range of digital I O channels Version Returns the version number of the UEIDAQ DLL that is installed on your system Using the VIs 2 8 2 Easy I O functions e AD Easy Wave This is a high level easy to use way to acquire an analog waveform e AD Trig Wave This is a high level easy to use way to acquire an analog waveform with analog triggering e
23. FIG BOARD Note the following i All configuration functions must be completed prior to the execution paths splitting ii VIs in parallel as above may execute in any order iii If one path contains a clocked I O operation to a particular subsystem then no parallel path should contain any V O operation involving that subsystem iv Only one path in a set of parallel paths may contain a clocked I O operation v Split execution paths can be resyncronized by the Synchronize VI 2 6 Channel addressing Channel addressing for the UEIDAQ LabVIEW drivers is done via arrays of channels Two kinds of arrays are supported i Integer arrays Integer arrays are simply arrays of integer channel numbers If you only want to select one channel simply create an array of only one element ii String channel arrays are identical to LabVIEW channel arrays a You can separate channel entries by placing each one in a separate array element or b separate channel entries by placing them in a single array element separated by commas e g 1 2 3 or c specify a range of channels by separating the first and last channels by a colon e g 1 3 or d any combination of the above 2 7 Error codes The error codes used by the UEIDAQ LabVIEW drivers have exactly the same meaning as for standard LabVIEW VI s Thus normal LabVIEW error handling VIs can be used The error codes used are Using the VIs 11 10005 10007 100
24. In VIs 27 Integer Out is a one dimensional array of integer format output data For information on data encoding consult your hardware reference manual Float Out is a one dimensional array of output data It is scaled to the range and gain selected by the AD Chan Configure VI that preceded the AD Chan In operation Data is in the same order as the Channel list array Task Id out is the Task Id corresponding to the board BE Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 5 3 AD Wave In Block Size Trigger Mode Task ld In Channel List Samples per Channel ampling Rate In Clock Mode Task Id Out Buffer Descriptor Sampling Period Out Status AD Ware In AD Wave In starts a timed multi channel input operation You can specify which channels to sample how often to sample them and how many samples to obtain You check for completion of the operation by using the AD Check VI and complete the operation by using the AD Close VI Warning The buffer descriptor output from the AD Wave In function must always find its way to a corresponding AD Close VI regardless of any error conditions which may occur If this is not done any memory used by the AD Wave In function may become permanently lost E Task Id in is the Task Id corresponding to the board This must be obtained from the AD Chan Configure VI There is no default for this contro
25. Labview directory These include waveform input and output spectrum analysis and data analysis programs Getting Started 7 Chapter 2 2 Using the LabVIEW VIs This chapter discusses the basic operation of the driver VIs and how to interconnect them 2 1 Introduction to the VIs The VIs supplied with UEIDAQ LabVIEW driver system fall into two groups i Data acquisition VIs These VIs access the hardware of the data acquisition board and actually perform data acquisition tasks This chapter discusses the overall operation of these VIs ii Data analysis VIs These are general purpose VIs capable of processing any LabVIEW data not just that from the UEIDAQ data acquisition VIs The operation of these VIs is identical to the VIs supplied with LabVIEW Indeed many of these VIs for example the FFT routines are direct replacements for routines supplied in the LabVIEW Analysis package The operation of these VIs are discussed in chapters 9 thru 12 2 2 VI Naming In order not to conflict with the naming of functions already present in LabVIEW especially in the analysis library many functions have a UEI prefix For example the FFT function is called UEI FFT This is necessary because LabVIEW cannot effectively deal with functions of the same name which reside in different locations 2 3 How the VIs view hardware The data acquisition VIs view data acquisition boards as consisting of four interacting subsystem
26. User manual for UEIDAQ for LabVIEW High Performance Data Acquisition Software for IBM PC PC XT PC AT and compatible Computer Systems Copyright 1993 1997 Keyview Investments Limited All right reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form by any means electronic mechanical by photocopying recording or otherwise without prior written permission Third edition June 1994 June 1994 Printing Information furnished in this manual is believed to be accurate and reliable however no responsibility is assumed for its use nor for any infringements of patents or other rights of third parties which may result from its use IBM IBM PC XT AT and IBM PS 2 are trademarks of International Business Machine Corporation BASIC is a trademark of Dartmouth College Microsoft is a trademark of Microsoft Corporation LabVIEW is a trademark of National Instruments Corporation Product and company names listed are trademarks or trade names of their respective companies Table of Contents Preface 1 Getting started 1 1 Introduction 1 2 Boards supported 1 3 Windows support 1 4 Functions supported 1 5 Installing the UEIDAQ LabVIEW driver 1 6 Driver structure 1 7 Examples 2 Using the LabVIEW VIs 2 1 Introduction to the VIs 2 2 VI Naming 2 3 How the VIs view hardware 2 4 Data acquisition VI operation 2 5 Multiple execution paths 2 6 C
27. XT and PC AT systems and are fully compatible with the 16 bit series of boards The first part of the 32 bit series of boards is the WIN 30 series which features input resolution of 12 bits Analog Inputs Analog Outputs WIN 30D 16 single ended 12 bit resolution i il WIN 30DA 16 single ended 12 bit resolution Two 12 bit two 16 bit WIN 30DS 4 4 simultaneously sampled 12 bit resolution Two 12 bit two 16 bit WIN 30PGL 16 single ended 8 differential programmable Two 12 bit two 16 bit gains of 1 10 100 1000 12 bit resolution WIN 30DS 16 simultaneously sampled 12 bit resolution Two 12 bit two 16 bit WIN 30PGH 16 single ended 8 differential programmable Two 12 bit two 16 bit gains of 1 2 4 8 12 bit resolution WIN 30PGSL 16 single ended 8 differential programmable Two 12 bit two 16 bit gains of 1 10 100 1000 12 bit resolution simultaneous sampling WIN 30PGSH 16 single ended 8 differential programmable Two 12 bit two 16 bit gains of 1 2 4 8 12 bit resolution simultaneous sampling The WIN 30 series of boards is also available in 16 bit analog input resolution as the WIN 3016 series detailed below Getting Started 3 Wna 16m ces violin WIN 3016DS 4 4 simultaneously sampled 16 bit resolution Two 12 bit two 16 bit WIN 3016PGL 16 single ended 8 differential programmable Two 12 bit two 16 bit gains of 1 10 100 1000 16 bit resolution WIN 3016PGH 16 single ended 8 differ
28. able for display in a graph Output can be in voltage power or dB s and a smoothing window can be specified This VI processes the 2 sided output from the Power Spectrum VI into a format suitable for display It correctly accounts for the effect of this operation on the DC component of the input sequence Sampling Period is the sampling period of the input sequence as for example provided by the AD easy Wave function Window Select selects an optional smoothing window Possible selections are 0 No window 1 Hanning window 2 Hamming window 3 Blackman Harris window ost Data In is the input sequence dB Linear selects the output format Possible selections are 0 dB 1 Power Watts into 1 Ohm 2 Voltage Frequency Inc is the frequency increment between successive values in the output data This can be used as an input to a waveform graph Data Out is the spectrum output 11 7 Chirp Z Spectrum Analysis Frequency Start Sampling Period Frequency Start Window Select Frequency Inc Data In Data Out dB Linear Frequency End Chirp Z Spectrum Analysis 56 Spectrum Analysis VIs The Chirp Z spectrum analysis VI computes the single sided spectrum of a waveform over a specified frequency interval in a format suitable for display in a graph The Chirp Z transform is similar to the FFT process used by the Spectrum Analysis VI but where the FFT always converts to the frequency domain over a fixed range of frequenci
29. all subsequent I O operations Wait is true if the function has not yet completed and false if it has Analog In VIs 29 Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 5 5 AD Close to Integer Task Id In alse 2 ela ie Buffer Descriptor ar Stas AD Close to Integer AD Close to Integer closes a data acquisition operation started by AD Wave In The output of this function is an array of 16 bit integers For a version of this function that outputs scaled floating point values see the AD Close To Single VI E Task Id in is the Task Id corresponding to the board This must be obtained from the AD Wave In VI or AD Check VI There is no default for this control Buffer descriptor provides status information from the AD Wave In and AD Check VIs You must not modify this information in any way Task Id out is the Task Id corresponding to the board This must be used in all subsequent I O operations Integer Results is a two dimensional array of output data Its size is the product of the number of channels and the number of samples For information on data encoding consult your hardware reference manual Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 5 6 AD Close to Single a es Hest Hess Buffer Descriptor 8 A Status AD Close to Single AD Close to
30. an Harris window ea Blkh LEI error x Blackman Harris Window This function applies a Blackman Harris window to the input sequence Note that this is the 4 term minimum window which provides over 92 dB of sidelobe rejection not the more common 3 term version This high sidelobe rejection makes this window very useful for data acquisition functions as it reduces the level of spectral leakage to below the noise floor of even a 16 bit converter Note This window is normalized to preserve the average power in the input waveform It must be scaled for use in filter design X is the data to be windowed Blkh X is the windowed data Ed Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these Windows VIs 51 Chapter 11 11 Spectrum analysis VIs Spectrum analysis VIs are used to estimate the spectral content of a sampled signal 11 1 Spectrum analysis introduction The following functions are available Power spectrum This VI computes the 2 sided power spectrum of a waveform Linear spectrum This VI computes the 2 sided voltage spectrum of a waveform Power Chirp Z spectrum This VI computes the power spectrum of a waveform over a specified frequency interval Linear Chirp Z spectrum This VI computes the voltage spectrum of a waveform over a specified frequency interval Spectrum Analysis This VI computes
31. and 4 MBytes of memory is required A 386DX or 486 processor and 8 Mbytes of memory are recommended 1 4 Functions supported Functions supported depend on two factors e The version of UEIDAQ installed on your machine Depending on the product that you purchased your version of UEIDAQ may support only certain boards Versions of UEIDAQ that are supplied with a specific board always support that board but may or may not support other UEI products Consult the documentation supplied with the version of UEIDAQ that you are using e The board in question Various boards support only certain functions The list below provides a rough guide 1 4 1 UEI 26 and UEI 30 Diagnostics analog output on all four D A outputs obtain a single A D sample obtain a series of A D samples on either a single or multiple channels digital I O 1 4 2 UEI 39 Diagnostics analog output on all four D A outputs obtain a single A D sample obtain a series of A D samples on either a single or multiple channels single channel DMA operation digital I O 1 4 3 UEI 30B and UEI 30C Diagnostics analog output on all four D A outputs obtain a single A D sample obtain a series of A D samples on either a single or multiple channels either single channel or multiple channel DMA operation digital I O 1 4 4 UEI 30D Diagnostics analog output on all four D A outputs obtain a single A D sample obtain a series of A D samples on either a single or multiple chan
32. arallel 11 Picket fence effect 45 Power Chirp Z Spectrum 47 Power Spectrum 46 Premium series 2 3 Ring 0 7 Scalloping 45 Sidelobe rejection 43 Signal processing VIs 35 Spectral content 45 Spectral leakage 41 Spectrum analysis 48 Spectrum analysis VIs 45 Standard mode 7 String To Int Chan List 33 Subsystem 9 Synchronize 34 SYSTEM INL 8 Task Id 10 UEI 126 3 UEI 127 3 UEI 14 4 UEI 192 4 UEI 26 1 UEI 30 1 UEI 30B 2 UEI 30C 2 UEI 30D 2 UEI 30DS 2 5 UEI 30DS 4 2 5 UEI 30PG 3 UEI 36 4 UEI 39 2 UEI 66 4 UEI 66A 4 UEIDAQ 5 6 UEIDAQV 386 7 Utility VIs 33 Version 20 Virtual device driver 5 7 Vxd 5 7 8 Window VIs 41 Windowed design 51 Index Windows 4 7 Zero pad 38 Index 67
33. are simple high level analog I O functions that provide a quick way to satisfy most commonly encountered data acquisition requirements Chapter 5 Analog input functions e Chapter 5 discusses the low level analog input functions These are somewhat more complex functions that allow more flexibility than the easy I O functions Chapter 6 Analog output functions e Chapter 6 discusses the low level analog output functions Chapter 7 Digital I O functions e Chapter 7 discusses the Digital I O functions These functions provide digital input and output functions Chapter 8 Utility functions e Chapter 8 discusses the utility functions These functions provide various services such as synchronization and format conversion that do not access data acquisition hardware directly Chapter 9 Signal processing VIs e Chapter 9 discusses the signal processing VIs These functions provide the means to analyze your data once it is acquired They include FFT IFFT and Hilbert transforms Chapter 10 Window VIs e Chapter 10 discusses the window VIs Window operations are used both for filter design and spectrum analysis Chapter 11 Spectrum analysis VIs e Chapter 11 discusses the spectrum analysis VIs These are used to estimate the spectral content of a sampled signal Chapter 12 Filter VIs e Chapter 12 discusses the Filter VIs These VIs are used to filter waveforms Chapter 1 1 Getting started This chapter intr
34. be used as an input to a waveform graph Frequency Inc is the frequency increment between successive values in the output data This can be used as an input to a waveform graph Data Out is the spectrum output Spectrum Analysis VIs 57 Chapter 12 12 Filter VIs The filter VIs are used to filter waveforms 12 1 Filter VI introduction The following filter VIs are available e FIR coefficients Calculates the coefficients of specified FIR Finite Impulse Response filter e FIR window coefficients Calculates the coefficients of specified FIR filter using a specified smoothing window e FIR Filter Performs a FIR filtering operation on data sequence FIR Finite Impulse Response filters have several advantages over other possible digital filter realizations such as Infinite duration Impulse Response IIR filters i They are always stable ii always realizable and ii can always be designed to have linear phase The easiest design technique is windowed design Although other techniques notably the Parks McClellan algorithm can lead to shorted filters these algorithms do not always converge In addition the LabVIEW environment is not particularly memory or processing power bound Briefly the windowed design technique follows these steps i Choose a window which gives the desired stopband attenuation Note that stopband attenuation is not the same as the sidelobe attenuation discussed previously with respect t
35. cteristics of the UEI 30 but adds several enhancements i Single channel DMA operation This boosts throughput to 80 kHz on a single input channel ii Improved analog input specification The UEI 39 features high impedance inputs iii Improved status read back The UEI 39 has an extra conversion status bit which simplifies programming and can increase throughput considerably iv Improved interrupt operation The UEI 26 and UEI 30 could lose interrupts The UEI 39 cannot Note Old series boards are supported only in PC or PC XT machines and 100 compatibles Operation in PC AT or compatible machines is not supported 1 2 2 16 bit series boards The 16 bit series of boards consists of eight boards All 16 bit series boards are supported in PC AT systems and are fully compatible with all old series boards 1 2 2 1 UEI 30B The UEI 30B forms the basis of the new UEI 30 range It features 30 kHz throughput and advanced DMA circuitry which allows multi channel analog input operations at full throughput 1 2 2 2 UEI 30C The UEI 30C has all the features of the UEI 30B but features an A D throughput of 100 kHz 1 2 2 3 UEI 30D The UEI 30D is a development of the UEI 30C with A D throughput of 200 kHz It is designed for use in PC AT and AT compatible PCs In addition to improved throughput the UEI 30D also contains FIFO buffers for A D data for improved operation in conjunction with multi tasking operating systems such as OS 2
36. d This must be used in all subsequent subsystem configuration VIs Type Out is the type of the board as actually identified by the UEIDAQ diagnostics function If you specified anything other than auto identify for the input type then this will be the same as the input type unless an error condition occurred Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 3 3 AD Chan Configure Gain list Task Id In Channel List Mode Task Id Out Status AD Chan Config AD channel configure configures a range of A D input channels for range gain and mode Task Id in is the Task Id corresponding to the board This must be obtained from the Configure Board VI There is no default for this control Channel list is a list of the channels that are to be configured To convert from a string format channel list to the integer format required by this function use the String To Int Chan List VI The default setting is 1 which selects all channels on the board Range indicates the analog voltage range for the channels Note that most boards are limited to a single range that applies to all channels For such boards if more than one range is requested the most recent request is used Note also that if the board that you are using does not support software range selection then you must ensure that the range input corresponds to the range that your board is actually
37. data acquisition 8 2 Software Trigger Position Data In R Trigger Point Slope Found Mode SuN Level Software Trigger Software Trigger looks for a trigger condition in an array of data and return information on whether the condition was found and the position at which the condition was found This allows an analog trigger to be emulated in software For a example of how to use this VI study the AD Trig Wave VI Position sets the amount of pre trigger data required Effectively the Software Trigger VI doesn t start searching for data in the first lt Position gt samples in the input buffer Data In is a the data to be searched Note that this is a one dimensional array Slope is the slope of the trigger event to be searched for If this is true then a positive slope is searched for and if it is false a negative slope Utility VIs 39 H F El B E F Mode is the trigger mode If this is false then found will always return true regardless of whether a valid trigger was found This is equivalent of Auto triggering on an oscilloscope data will always be displayed If it is true found will only return true if a valid trigger condition was found Level sets the level at which the trigger condition will occur Trigger Point represents the offset into the data buffer at which the specified trigger condition occurred If no trigger occurred and Mode was false then this will return 0 Found is set if
38. dded data 46 Signal Processing VIs Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these Signal Processing VIs 47 Chapter 10 10 Window VIs Window operations are used both for filter design and spectrum analysis 10 1 Windows VI introduction The following windows are available e Hamming window e Hanning window e Blackman Harris window When a continuous waveform is sampled the start and end of the sampling operation unavoidably introduce discontinuities These discontinuities almost inevitably translate into the frequency domain as unwanted spectral leakage This leakage can be reduced by applying a smoothing window However application of such a window has an undesirable side effect the width of frequency components that actually are present is increased making more difficult to precisely identify the presence or absence of signals In general there is a tradeoff between the degree to which a particular window suppresses spectral leakage and the extent to which it broadens spectral components The analysis library provides an assortment of windows offering different combinations of characteristics D 25 50 The other major application for smoothing windows is in the design of FIR filters Analytic expressions are available for the tap weights for most simple FIR filters These expressions are infinite in duration and thus for practical
39. driver must ensure that only one of the I O subsystems analog input analog output and digital I O attempt to use any interrupt or DMA channel at any one time One of the primary responsibility of the driver system in a multi tasking environment such as LabVIEW is to ensure that only one operation at a time is performed on each of these subsystems The mechanism that the UEIDAQ LabVIEW drivers use to ensure this is the Task Id In addition to ensuring that only one operation at a time occurs on any of the subsystems Task Ids are also used to ensure that a board has been correctly initialized prior to operation 2 4 Data acquisition VI operation The basic structure of a simple data acquisition is shown below CONFIG AD AD BOARD CHAN CHAN Data out CONFIG IN UEI LEI LEI DBL The flow of Task Ids is as follows i Task Id s can only be originated by the Configure Board VI One this has been done you must use this Task Id for all I O operations on the board in question Optional inputs to the Configure Board VI include the board type the base address of the board and a logical board number Note that this board number is used purely to identify the board uniquely you can use any number between 0 and 7 as long as you don t use the same number for two boards ii The Task Id from the Configure board VI can then be used to configure the analog input analog output and digital I O subsections of the board The VIs in question are
40. e FFT of an input sequence If no imaginary input is connected the VI performs an FFT on only the real valued part Note that this function is a pure FFT if the length of the inputs are not powers of two then they are truncated to the next lowest power of 2 If this is undesirable then the Zero Pad VI can be used to pad out the sequence to the next higher power of 2 Signal Processing VIs 43 r td no Re X is the real valued part of the input sequence DeL Im X is the imaginary valued part of the input sequence Re FFT X is the real valued part of the output sequence Im FFT X is the imaginary valued part of the output sequence o E E Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 9 3 Inverse FFT Reix Re IFFT x Innit UEI Im IFFT lt error UEI Inverse FFT The Inverse FFT function UEI Inverse FFT computes the inverse FFT of an input sequence If no imaginary input is connected the VI performs the function on only the real valued part Note that this function is a pure inverse FFT if the length of the inputs are not powers of two then they are truncated to the next lowest power of 2 If this is undesirable then the Zero Pad VI can be used to pad out the sequence to the next higher power of 2 ost Re X is the real valued part of the input sequence per Im X is the imaginary valued part of the input sequence
41. e selected channel s output range Task Id out is the Task Id corresponding to the board Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 6 3 DA Wave Out Clock Mode Trigger Mode Task Id In Task Id Out Channel List Buffer Descriptor Sampling Rate In Sampling Period Out Data In Status Cycles DA Wave Out DA Wave Out starts a timed multi channel output operation You can specify which channels to send data to how often to update them and how many times to repeat the data You check for completion of the operation by using the DA Check VI and complete the operation by using the DA Close VI Warning The buffer descriptor output from the DA Wave Out function must always find its way to a corresponding DA Close VI regardless of any error conditions which may occur If this is not done any memory used by the DA Wave Out function may become permanently lost E a E 34 Task Id in is the Task Id corresponding to the board This must be obtained from the DA Chan Configure VI There is no default for this control Channel list is a list of the channels to which data is to be written To convert from a string format channel list to the integer format required by this function use the String To Int Chan List VI The default setting is 0 Sampling rate in is the rate at which the outputs will be updated The default sampling rate is 1 kHz Cyc
42. e size of the output array FIR Coefficients are the filter weights Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 61 12 4 FIR Filter en low cuto filter type win ge Filtered Data gfeq L E freq fl error high cutoff freq fh taps UEI FIR Filter The FIR Filter UEI FIR Filter VI implements a FIR filter It computes the tap weights for a FIR filter based on FIR design formulas and a selected window then filters the input sequence with this filter This VI always designs linear phase filters both for odd and even filter lengths BEE F DEL E e E E Filter Type selects the type of filter Possible selections are 0 Lowpass 1 Highpass 2 Bandpass 3 Bandstop The default value is 0 Sampling Freq fs is the sampling frequency of the input sequence to the FIR filter The default value is 1 Low cutoff Freq fl is the low cutoff frequency This must be between 0 and fs 2 The default value is 0 12 High cutoff freq fh is the high cutoff frequency This must be between fl and fs 2 This is ignored for lowpass and highpass filters The default value is 0 45 Window selects an optional smoothing window Possible selections are 0 No window 1 Hanning window 2 Hamming window 3 Blackman Harris window Taps is the number of taps in the filter This is the size of the output array X is the input sequence
43. either a valid trigger condition occurred or mode was false 8 3 String To Int Chan List n El String Channel Array eoooooos lar Integer Channel Array WEIJ String to Int Chan List String To Int Chan List converts a channel list in the form of a string array to a channel list formatted as an integer array String Channel Array is a list of the channels This is in string format For a discussion of this format see the section on channel addressing The default setting is channel 0 Integer Channel Array is a list of the channels formatted as integers 8 4 Synchronize Task Id 1 In Task Id 2 In Task Id 3 In Task Id4 In Task Id 1 Out Task Id2 Out UEI Task Id 3 Out Task Id 4 Out Synchronize Synchronize synchronizes multiple paths of execution For more information see the section on multiple execution paths E E E E 40 Task Id 1 In is the Task Id corresponding to the first execution path to be synchronized If this control is left unconnected it is ignored Task Id 2 In is the Task Id corresponding to the second execution path to be synchronized If this control is left unconnected it is ignored Task Id 3 In is the Task Id corresponding to the third execution path to be synchronized If this control is left unconnected it is ignored Task Id 4 In is the Task Id corresponding to the fourth execution path to be synchronized If this control is left unconnected it is ignored Utility VIs E E
44. ential programmable Two 12 bit two 16 bit gains of 1 2 4 8 16 bit resolution 1 2 4 Digital I O boards The following digital I O boards are supported 1 2 4 1 UEI 14 The UEI 14 has six 8 bit digital I O ports Each port can be programmed as either an input or output The UEI 14 also features 3 counter timer devices but these are not supported by UEIDAQ 1 2 4 2 UEI 36 The UEI 36 has three 8 bit digital I O ports Each port can be programmed as either an input or output 1 2 4 3 UEI 192 The UEI 192 has twenty four 8 bit digital I O ports Each port can be programmed as either an input or output 1 2 5 Analog output boards The following analog output boards are supported 1 2 5 1 UEI 66 The UEI 66 has twelve analog outputs each of which can be configured for monopolar or bipolar outputs 1 2 5 2 UEI 66A The UEI 66A has eighth analog outputs each of which can be configured for monopolar or bipolar outputs 1 3 Windows support Windows support is provided as follows e Windows 3 1 enhanced mode only is supported Operation under Windows 3 or earlier or in Windows 3 1 standard mode is not possible e Windows 3 1 support is viaa DLL Dynamic Linked Library and a virtual device driver Vxd Both of these must be accessible to Windows for the driver system to operate Installation of the DLL and Vxd are discussed further later in this manual 4 Getting started e A minimum configuration of a 386 processor
45. es the Chirp Z allows the range of frequencies to be selected Technically the FFT algorithm evaluates over the unit circle in the z plane while the Chirp Z evaluates over a user definable portion of the unit circle Output can be in voltage power or dB s and a smoothing window can be specified This VI processes the 2 sided output from the Power Chirp Z Spectrum VI into a format suitable for display Note that this VI does NOT correct for the effects of this operation on the DC component of the input sequence E E E F DBL F Frequency Start is the frequency at which the transform is to be started scaled such that 1 is equivalent to half the sequence s sampling frequency The default value for this control is 0 Frequency End is the frequency at which the transform is to be ended scaled such that 1 is equivalent to half the sequence s sampling frequency The default value for this control is 1 Sampling Period is the sampling period of the input sequence as for example provided by the AD easy Wave function Window Select selects an optional smoothing window Possible selections are 0 No window 1 Hanning window 2 Hamming window 3 Blackman Harris window Data In is the input sequence dB Linear selects the output format Possible selections are 0 dB 1 Power Watts into 1 Ohm 2 Voltage Frequency Start Out is the frequency at which the output data starts scaled to the sampling frequency This can
46. f the base address is set to 0 and the type is set to auto identify then an address of 700 hex is used The value defaults to 1 Configuration VIs 15 16 Board number is the board s logical identifying number This may be between O and 7 and may be arbitrary chosen as long as no two boards have the same number It defaults to 0 Type is the board type This may be one of the following values 0 Auto identify 1 UEI 26 UEI 30 UEI 39 UEI 30B or UEI 30C UEI 30D or UEI 30DS UEI 30PGL UEI 30PGH UEI 126 UEI 127 WIN 30D DS 10 WIN 30PGL and PGSL 11 WIN 30PGH and PGSH 12 WIN 3016D DS 13 WIN 3016PGL and PGSL 14 WIN 3016PGH and PGSH 15 UEL 14 16 UEI 36 17 UEI 192 18 UEI 66 19 UEI 64 20 UEI 73 NN 0 1 Dn Uu A W N Note that not all board types can be auto identified Also remember to consult the RELEASE TXT file on the distribution diskette to see what boards your specific version of the UEIDAQ supports The default setting for this control is auto identify Primary DMA is the primary DMA channel For boards that do not support software configuration of DMA levels this should be set to correspond to the DMA level for which your board has been configured In the case of boards that do support software configuration of DMA levels the board will be set to this DMA level Consult your hardware manual for a discussion of the appropriate DMA level for your application If this control is set to 1 the
47. hannel addressing 2 7 Error codes 2 8 Quick reference 3 Configuration functions 3 1 Configuration VI introduction 3 2 Configure board 3 3 AD Chan Configure 3 4 DA Chan Configure 3 5 DIO Port Configure YN DO un A e o jp oo oO vo Rh ka a ka pa No Rh a SO 15 15 15 17 18 19 3 6 Version 4 Easy I O functions 4 1 Easy I O VI introduction 4 2 AD Easy Wave 4 3 AD Trig Wave 4 4 DA Easy Wave 5 Analog input functions 5 1 Analog input VI introduction 5 2 AD Chan In 5 3 AD Wave In 5 4 AD Check 5 5 AD Close to Integer 5 6 AD Close to Single 6 Analog Output functions 6 1 Analog output VI introduction 6 2 DA Chan Out 6 3 DA Wave Out 6 4 DA Check 6 5 DA Close 7 Digital I O functions 7 1 Digital I O VI introduction 7 2 DIO Port In 7 3 DIO Port Out 8 Utility functions 8 1 Utility VI introduction 8 2 Software Trigger 8 3 String To Int Chan List 8 4 Synchronize 9 Signal processing VIs 19 21 21 21 22 24 27 21 21 28 29 30 30 33 39 33 34 35 36 37 37 37 38 39 39 39 40 40 43 9 1 Signal processing introduction 9 2 FFT 9 3 Inverse FFT 9 4 Hilbert transform 9 5 Inverse Hilbert transform 9 6 Chirp Z 9 7 Convolution 9 8 Zero pad 10 Window VIs 10 1 Windows VI introduction 10 2 Hamming window 10 3 Hanning window 10 4 Blackman Harris window 11 Spectrum analysis VIs 11 1 Spectrum analy
48. ist is a list of the channels that are to be used for waveform generation This is in string format For a discussion of this format see the section on channel addressing The default setting is channel 0 Sampling rate in is the rate at which each D A will be updated AG Data In is a two dimensional array of output data Its size is the product of the number of channels and the number of samples DA Easy Wave assumes that the smallest dimension corresponds to the number of D A channels to be updated Cycles is the number of times that the input data will be repeated A setting of 0 selects continuous updates however use of this mode is not recommended as there will be no way of stopping the VI If continuous output is required the low level VIs should be used individually as shown in the DA Wave example VI 24 Easy VIs E E B Easy VIs Sampling Period Out is the actual period between successive conversions on the same input channel Note that this may not be exactly what would be expected from the Sampling Rate In control as data acquisition boards can generally select sampling periods in finite sized steps Task Id out is the Task Id corresponding to the board This must be used in all subsequent I O operations Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 25 Chapter 5 5 Analog input functions This chapter provides a description
49. k Library and a virtual device driver Vxd Both of these must be accessible to Windows for the driver system to operate The DLL is UEIDAQ DLL and the Vxd is UEIDAQV 386 iv Windows locates a dynamic link library by searching the same directories it searches to find an application module For Windows to the find the library it must be in one of the following directories which Windows searches in the order listed a The current directory b The Windows directory the directory containing WIN COM c The Windows system directory the directory containing such system files as GDI EXE d Any of the directories listed in the PATH environment variable e Any directory in the list of directories mapped in a network v Microsoft recommends that DLL s be loaded into the Windows system directory This is where the default installation program places UEIDAQ DLL but any other valid position is acceptable vi In order for Windows to load the UEIDAQV Vxd the following line must appear in the 386ENH section of the Windows SYSTEM INI file device c uei ueidaqv 386 This assumes that the Vxd is in the default location the c UEI directory If it is not then the line should be modified accordingly Once again this is automatically done by the default installation program 1 7 Examples A wide variety of example VI that show how to use the various functions described in this manual may be found in the VLLIB UENEXAMPLES VI in your
50. l Channel list is a list of the channels that are to be measured To convert from a string format channel list to the integer format required by this function use the String To Int Chan List VI The default setting is 0 Samples per channel is the number of samples to be taken for each channel in the channel list the default is 1024 Sampling rate in is the rate at which each samples will be taken Note that this rate is NOT the same as the rate used by the AD Easy Wave function actual sampling rate depends on the block size The default sampling rate is 1 kHz Block size sets the size of blocks for those boards that support block mode operations Setting a block size of 1 is the same as setting a block size of zero If block size is O or 1 then a single sample is taken on each clock pulse In this case board throughput is equal to the sampling rate If block size is greater than 1 then a number of samples equal to the block size are taken on each clock pulse for boards that support simultaneous sampling simultaneously In this case the board throughput is equal to the product of the 28 Analog In VIs sampling rate and the block size For more information on block mode sampling see your hardware manual Default block size is 0 Trigger mode selects the board s trigger mode for those boards that support software programmable trigger modes The default setting is internal The following values are supported 0 Internal 1 External
51. les sets the number of times that the input data will be sent to the D A converters Setting a value of 0 repeats the data continuously until the DA Close Vi is called Trigger mode selects the board s trigger mode for those boards that support software programmable trigger modes The default setting is internal The following values are supported O Internal 1 External Analog Out VIs Clock Mode selects whether the D A clock is derived from the internal clock or is supplied externally for those boards that support software programmable clock sources The default setting is internal The following values are supported 1 Internal 0 External Data in is the waveform data to be sent to the D A converters This is scaled voltage data E E Sampling Period Out is the actual time between clock pulses Note that may not be exactly what would be expected from the Sampling Rate In control as data acquisition boards can generally select sampling periods only in finite sized steps Buffer descriptor provides information to the DA Check and DA Close VIs You must not modify this information in any way Task Id out is the Task Id corresponding to the board This must be used in all subsequent I O operations A E Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 6 4 DA Check Task ld In Task Id Dut 7 le Buffer Descriptor Buffe
52. m a string format channel list to the integer format required by this function use the String To Int Chan List VI The default setting is 1 which selects all channels on the board Range indicates the analog voltage range for the channels to be configured If the board that you are using does not support software range selection then you must ensure that the range input corresponds to the range that your board is actually configured for If these do not correspond then voltage outputs from subsequent functions will be incorrect The default setting for this control is 5 to 5V Range may be one of the following values 0 5 to 5V 1 0to 5V 2 10 to 10V 3 0to 10V 4 2 5 to 2 5V Configuration VIs 5 0to 2 5V Mode indicates the output mode This is currently unused and should be left unconnected Task Id out is the Task Id corresponding to the board This must be used in all subsequent analog output subsystem VIs Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 3 5 DIO Port Configure Task Id In Dio Channel List Cone Task Id Out Latch Mode UEI Status Direction DIO Port Config DIO port configure configures a range of DIO output ports for direction and mode El Task Id in is the Task Id corresponding to the board This must be obtained from the Configure Board VI There is no default for this control Channel list is a list of the
53. nels either single channel or multiple channel DMA operation gap free dual DMA channel operation digital I O 1 4 5 UEI 30DS The UEI 30DS and UEI 30DS 4 share all of the abilities of the UEI 30D and appear identical to software The only difference in operation comes about in block mode operation where all sampled channels are sampled simultaneously All references in this manual to UEI 30D boards also applies to UEI 30DS and UEI 30DS 4 boards unless specifically stated otherwise 1 4 6 UEI 30PG The UEI 30PG shares all the functions of the UEI 30D but in addition allows the gain of each analog input channel to be individually set 1 4 7 UEI 126 and UEI 127 Diagnostics analog outputs obtain a single A D sample obtain a series of A D samples on either a single or multiple channels digital I O and waveform generation Getting Started 5 1 4 8 WIN 30 series Diagnostics obtain a single A D sample obtain a series of A D samples on either a single or multiple channels either single dual channel DMA or rep string operation gap free dual DMA channel operation digital I O 1 5 Installing the UEIDAQ LabVIEW driver The LabVIEW driver installs automatically Follow these steps i Place the distribution diskette in drive A or B ii Ascertain the name of the directory that LabVIEW is installed to This is usually C LABVIEW iii Start Windows iv Go to the Windows File menu and select Run v Enter A SETUP as the
54. o spectrum analysis ii Using the required transition width the frequency width from the edge of the passband to the edge of the stopband from the filter specification and the transition width of the selected window calculate the number of taps required in the filter iii Use the analytic filter design formulas to obtain an expression giving the tap weights or coefficients for the filter Filter VIs 59 iv Window the resulting tap weights with the selected window For an algorithm and numerical values for this technique see the Filter Estimate example VI and for a simple tutorial on it see Digital Signal Processing Laboratory V K Ingle J G Proakis Analog Devices Prentice Hall 1991 12 2 FIR coefficients Type i eed FIR Coefficients fl LEI Status taps UEI FIR Coefficients The FIR coefficients UEI FIR Coefficients VI computes the tap weights for a FIR filter based on FIR design formulas This VI always designs linear phase filters both for odd and even filter lengths Type selects the type of filter Possible selections are 0 Lowpass 1 Highpass 2 Bandpass 3 Bandstop The default value is 0 fs is the sampling frequency of the input sequence to the FIR filter The default value is 1 fl is the low cutoff frequency This must be between 0 and fs 2 The default value is 0 12 BEE fh is the high cutoff frequency This must be between fl and fs 2 This is ignored for lowpass and highpass filte
55. oduces the UEIDAQ LabVIEW Driver system 1 1 Introduction UEIDAQ LabVIEW Driver software has been written to allow the easy use of all WIN 30 UEI 30 UEI 126 UEI 127 UEI 14 UEI 36 UEI 192 and UEI 66 functions from LabVIEW for Windows V3 or later 1 2 Boards supported UEIDAQ LabVIEW Driver package supports the following boards e All analog input boards the WIN 30 and UEI 30 series boards and the UEI 126 and UEI 127 e All UEI digital I O boards including the UEI 14 UEI 36 and UEI 192 e All UEI analog output boards including the UEI 66 The complete range of UEI analog input boards consist of three series of boards the old series the 16 bit series and the 32 bit or WIN series 1 2 1 Old series boards The old series of boards consists of three boards 1 2 1 1 UEI 26 The UEI 26 is the original board in the range It is an analog input board with 16 single ended inputs and a programmable clock Maximum throughput is 25 kHz 1 2 1 2 UEI 30 The UEI 30 has the same analog input capability as the UEI 26 and is fully compatible with the UEI 26 but has several additional capabilities i Digital I O There are 24 digital I O lines each of which may be programmed as an input or an output Getting Started 1 ii Two 12 bit D A converters with either bipolar or monopolar outputs iii Two 8 bit D A converters also with either bipolar or monopolar outputs 1 2 1 3 UEI 39 The UEI 39 shares all the chara
56. of the various analog input VIs used by the driver 5 1 Analog input VI introduction The analog input VIs are e AD Chan In Acquires a single sample from each of a group of channels e AD Wave In Low level analog input function Starts a waveform acquisition process e AD Check Low level analog input function Checks to see whether a waveform acquisition started by AD Wave In has completed e AD Close To Integer Low level analog input function Completes a waveform input function started by AD Wave In The output from the function is an array of integer data e AD Close To Single Low level analog input function Completes a waveform input function started by AD Wave In The output from the function is an array of single precision floating point data 5 2 AD Chan In Task Id In A Task Id Out Int Out Channel List Float O u Status AD Chan In AD Chan In obtains a single sample from each of the specified channels The output data is available either as raw integer data or as floating point data scaled to the range and gain of the selected channels Task Id in is the Task Id corresponding to the board This must be obtained from the AD Chan Configure VI There is no default for this control 116 Channel list is a list of the channels that are to be measured To convert from a string format channel list to the integer format required by this function use the String To Int Chan List VI The default setting is 0 Analog
57. on on error codes for more information on these 9 6 Chirp Z Start Frequency Rei CHIRP 2 Re CHPiX Innit UEI Im CHP YX End Frequency error UEI Chirp Z The Chirp Z function UEI Chirp Z computes the Chirp Z transform of an input sequence If no imaginary input is connected the VI performs the transform on only the real valued part The Chirp Z transform is similar to the FFT but where the FFT always converts to the frequency domain over a fixed range of frequencies the Chirp Z allows the range of frequencies to be selected Technically the FFT algorithm evaluates over the unit circle in the z plane while the Chirp Z evaluates over a user definable portion of the unit circle The Chirp Z VI provided here is not a full Chirp Z transform a full transform has parameters which allow the evaluation to take place not only over a portion of the unit circle as in this case but over a arbitrary spiral in the z plane Note that if the length of the inputs are not powers of two then they are truncated to the next lowest power of 2 If this is undesirable then the Zero Pad VI can be used to pad out the sequence to the next higher power of 2 peL Re X is the real valued part of the input sequence per Im X is the imaginary valued part of the input sequence If no imaginary input is connected the VI performs the transform on only the real valued part Signal Processing VIs 45 E Start Frequency is the frequency at which the tran
58. r Descriptor Wait Status DA Check checks for the completion of an waveform output operation started by the DA Wave Out VI E Task Id in is the Task Id corresponding to the board This must be obtained from the DA Wave Out VI There is no default for this control Buffer descriptor provides status information from the DA Wave Out VI You must not modify this information in any way The Buffer descriptor output should be wired to the DA Close function Task Id out is the Task Id corresponding to the board This must be used in all subsequent I O operations TF E oe Wait is true if the function has not yet completed and false if it has HAE Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these Analog Out VIs 35 6 5 DA Close Task Id In DA Task ld Out CLOSE Buffer Descriptor UEI Status DA Close closes a data acquisition operation started by DA Wave Out Task Id in is the Task Id corresponding to the board This must be obtained from the DA Wave Out VI or DA Check VI There is no default for this control eee Buffer descriptor provides status information from the DA Wave Out and DA Check VIs You must not modify this information in any way Task Id out is the Task Id corresponding to the board This must be used in all subsequent I O operations Status contains the VI error code Negative values indicate an error See the section on
59. rs The default value is 0 45 Taps is the number of taps in the filter This is the size of the output array FIR Coefficients are the filter weights A EE Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 60 Filter VIs 12 3 FIR Windowed coefficients filter type sampling freq fs FIR icient high cutoff freq fh Ber FIR Coefficients ow cutoff freq fl m Status window taps UEI FIR Window Coefficients The FIR Windowed coefficients UEI FIR Window Coefficients VI computes the tap weights for a FIR filter based on FIR design formulas and a selected window This VI always designs linear phase filters both for odd and even filter lengths BEE F i E E Filter VIs Type selects the type of filter Possible selections are 0 Lowpass 1 Highpass 2 Bandpass 3 Bandstop The default value is 0 fs is the sampling frequency of the input sequence to the FIR filter The default value is 1 fl is the low cutoff frequency This must be between 0 and fs 2 The default value is 0 12 fh is the high cutoff frequency This must be between fl and fs 2 This is ignored for lowpass and highpass filters The default value is 0 45 Window selects an optional smoothing window Possible selections are 0 No window 1 Hanning window 2 Hamming window 3 Blackman Harris window Taps is the number of taps in the filter This is th
60. s These are the following i Analog input subsystem this section generally has associated with it a certain number of input channels each of which can have an input range 0 to 5V 5 to 5V etc and a gain 1 2 4 8 etc The analog input stage can also have a programmable clock This allows channels to be sampled at a fixed frequency ii Analog output subsystem this section generally has associated with it a certain number of output channels each of which can have an output range O to 5V 5 to 5V etc The analog output stage can also have a programmable clock This allows channels to be updated at regular intervals for example in order to generate waveforms Using the VIs 9 iii Digital I O subsystem this section generally has associated with it a certain number of digital port Each port is generally 8 bits in width Most but not all board have ports that can be programmed either as inputs or outputs Some boards also allow the port to be latched or clocked by an external line In addition certain boards can also have a programmable clock This allows ports to be sampled or updated at regular intervals iv Interrupt DMA subsystem clocked I O oper ations on any of the above subsystems generally require that some mechanism be available to transfer data from the board to the driver software This mechanism can be either interrupts or DMA Normally the operation of this subsystem is invisible to the LabVIEW VIs However the
61. s is in string format For a discussion of this format see the section on channel addressing The default setting is channel 0 Samples per channel is the number of samples to be taken for each channel in the channel list the default is 1024 Sampling rate in is the rate at which each channel individually will be sampled Board throughput is the product of the sampling rate and the number of channels Note that regardless of whether block mode is selected or not this rate is still the rate at which each channel is sampled The default sampling rate is 1 kHz Block mode selects whether samples are taken in normal or block mode for those boards that support this Because of the way that the sampling rate is interpreted by the VI this setting has no effect on the rate at which channels are sampled It does have an effect on the phase of the samples If block mode is true then the phase shift between samples taken on the same scan through the channel list will be as small as the board can make it For simultaneous sampling boards this will be 0 and for other boards equal to 1 Maximum throughput If block mode is false then samples taken on the same scan through the channel list will be evenly spread through the sampling interval For more information on block mode sampling see your hardware manual Position sets the amount of pre trigger data required Slope is the slope of the trigger event to be searched for If this is true then a positi
62. sform is to be started scaled such that 1 is equivalent to half the sequence s sampling frequency The default value for this control is 0 F End Frequency is the frequency at which the transform is to be ended scaled such that 1 is equivalent to half the sequence s sampling frequency The default value for this control is 1 Re FFT X is the real valued part of the output sequence Im FFT X is the imaginary valued part of the output sequence o E E Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 9 7 Convolution x A Rey Y Y UE Status UEI Convolution The convolution VI UEI Convolution computes the convolution of X and Y Note that this is NOT a circular convolution a X is the first sequence to be convolved ES Y is the second sequence to be convolved X Y is the convolution of the two sequences p unn e Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 9 8 Zero pad D Padded x UEI Zero Pad Zero pad UEI Zero Pad pads the input sequence with trailing zeros such that the size of the output array is a power of 2 This is used when you want to use one of the transform VT s that require the length of their input data to be a power of two on data that is not a power of two peu X is the data to be padded Padded X is the pa
63. sis introduction 11 2 Power Spectrum 11 3 Linear Spectrum 11 4 Power Chirp Z Spectrum 11 5 Linear Chirp Z Spectrum 11 6 Spectrum Analysis 11 7 Chirp Z Spectrum Analysis 12 Filter VIs 12 1 Filter VI introduction 12 2 FIR coefficients 12 3 FIR Windowed coefficients 12 4 FIR Filter Index 43 43 44 44 45 45 46 46 47 47 48 48 49 51 51 52 52 52 53 54 54 57 57 58 59 60 Preface This manual is written for users of UEIDAQ LabVIEW for Windows Drivers software package It provides all information necessary to successfully use the supplied driver software in conjunction with Lab VIEW This manual assumes e That you have a basic knowledge of electronic circuitry and measurement techniques e That you are familiar with the host PC which you are using e _ That you are familiar with LabVIEW e That you have read chapters 1 thru 4 of the user manual accompanying your WIN 30 UEI 30 UEI 126 UEI 127 UEI 14 UEI 36 UEI 192 or UEI 66 The manual contains the following sections Chapter 1 Getting Started e Chapter 1 contains an overview of UEIDAQ LabVIEW Driver software package and its capabilities Chapter 2 Using the LabVIEW VIs e Chapter 2 provides a tutorial on the use of the UEI LabVIEW VIs Chapter 3 Configuration functions e Chapter 3 discusses the board configuration functions Chapter 4 Easy I O functions e Chapter 4 discusses the Easy I O functions These
64. t where the FFT always converts to the frequency domain over a fixed range of frequencies the Chirp Z allows the range of frequencies to be selected Technically the FFT algorithm evaluates over the unit circle in the z plane while the Chirp Z evaluates over a user definable portion of the unit circle If the input sequence is expressed in volts then the output sequence represents volts This is calculated by taking the square root of the power sequence above The size of the input sequence must be a power of 2 If it is not the sequence will be truncated If this is undesirable then the Zero Pad VI can be used to pad out the sequence to the next higher power of 2 peu X is the input sequence Start is the frequency at which the transform is to be started scaled such that 1 is equivalent to half the sequence s sampling frequency The default value for this is 0 End is the frequency at which the transform is to be ended scaled such that 1 is equivalent to half the sequence s sampling frequency The default value for this is 1 Linear Spectrum is the linear spectrum El E Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these Spectrum Analysis VIs 55 11 6 Spectrum Analysis Sampling Period Window Select Frequency Inc Data In Data Dut dB Linear Spectrum Analysis The spectrum analysis VI computes the single sided spectrum of a waveform in a format suit
65. trum Analysis VIs the frequency domain over a fixed range of frequencies the Chirp Z allows the range of frequencies to be selected Technically the FFT algorithm evaluates over the unit circle in the z plane while the Chirp Z evaluates over a user definable portion of the unit circle If the input sequence is expressed in volts then the output sequence represents power into 1 Ohm The size of the input sequence must be a power of 2 If it is not the sequence will be truncated If this is undesirable then the Zero Pad VI can be used to pad out the sequence to the next higher power of 2 per X is the input sequence Start is the frequency at which the transform is to be started scaled such that 1 is equivalent to half the sequence s sampling frequency The default value for this control is 0 End is the frequency at which the transform is to be ended scaled such that 1 is equivalent to half the sequence s sampling frequency The default value for this control is 1 Power Spectrum is the power spectrum El E Error contains the VI error code Negative values indicate an error See the section on error codes for more information on these 11 5 Linear Chirp Z Spectrum x KIM Linear Spectrum Start CHP Z L End UEI error UEI Chp Z Linear Spectrum Linear Chirp Z Spectrum UEI Linear Chirp Z Spectrum computes the linear spectrum of an input sequence The Chirp Z transform is similar to the FFT process used by the Power Spectrum VI bu
66. unction emulates the operation of a oscilloscope style analog trigger operation on a buffer with data in it String To Int Chan List This function converts a list of channels in string format to the integer array format required by most of the data acquisition functions Synchronize This VI synchronizes the execution of multiple paths of data acquisition Using the VIs 13 Chapter 3 3 Configuration functions This chapter provides a description of the various configuration VIs used by the driver 3 1 Configuration VI introduction The configuration VIs are e Configure Board Configures a board e AD Chan Config Configures a range of analog input channels e DA Chan Config Configures a range of analog output channels e DIO Port Config Configures a range of digital I O channels 3 2 Configure board Base Address Board Number pe Primary DMA Secondary DMA Interrupt Level Task Id Out Type Out Status CONFIG BOARD UEI Configure Board Configure board configures the specified board This function is used to detect the presence of a specific board and to configure it for operation The output of this VI the Task Id is required as an input by subsequent data acquisition operations and serves to identify on which board the operation is to be performed Base Address is the base address of the board If this is set to 1 then the default base address for the board type is used I
67. ut process e DA Check Low level analog input function Checks to see whether a waveform output operation started by DA Wave Out has completed e DA Close Low level analog output function Completes a waveform output function started by DA Wave Out 6 2 DA Chan Out Tale fan Task Id Out Float In I uE Status Channel List DA Chan Out DA Chan Out writes a single value to each of the specified channels The values can be either raw integer data or floating point data scaled to the range of the selected channels Task Id in is the Task Id corresponding to the board This must be obtained from the DA Chan Configure VI There is no default for this control 116 Channel list is a list of the channels to which data is to be written To convert from a string format channel list to the integer format required by this function use the String To Int Chan List VI The default setting is 0 Analog Out VIs 33 A E Integer In is a one dimensional array of integer format data to be written to the analog outputs For information on data encoding consult your hardware reference manual Note that either integer OR floating point data not both must be supplied to this VI Float In is a one dimensional array of output data It must be scaled to the range and gain selected by the DA Chan Configure VI that preceded the DA Chan Out operation Data is in the same order as the Channel list array Values that are out of range will be limited to th
68. ve slope is searched for and if it is false a negative slope Mode is the trigger mode If this is false then a AD Trig wave will always output data regardless of whether a valid trigger condition was encountered This is equivalent of Auto triggering on an oscilloscope data will always be displayed If Mode is true the VI will not return until a valid trigger condition has been encountered The default setting is false Level sets the level at which the trigger condition will occur Data Out is a two dimensional array of output data Its size is the product of the number of channels and the number of samples It is scaled to the range and gain selected by the AD Chan Configure VI that preceded the AD Easy Wave operation Sampling Period Out is the actual period between successive conversions on the same input channel Note that this may not be exactly what would be expected from the Sampling Rate In control as data acquisition boards can generally select sampling periods in finite sized steps Task Id out is the Task Id corresponding to the board This must be used in all subsequent I O operations Status contains the VI error code Negative values indicate an error See the section on error codes for more information on these 23 E Position sets the amount of pre trigger data required Effectively the Software Trigger VI doesn t start searching for data in the first lt Position gt samples in the input buffer Data In is

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