VXI-AO-48XDC User Manual
Contents
1. eee 2 2 Figure 2 2 Logical Address Selection 2 4 Figure3 1 CH 0 23 Connector Pin Assignments sese 3 2 Figure 3 2 CH lt 24 47 gt Connector Pin Assignment 3 3 Figure 3 3 VCH Connection as a Voltage Output 3 5 Figure 3 4 ICH Connection as a Current Output 3 7 Figure 3 5 Digital I O Connections ss 3 8 Figure 4 1 VXI AO 48XDC Block Diagram eee 4 1 Tables Table 3 1 CH lt 0 23 gt Connector Descriptions ses sesse ee ee Re RA ee ed 3 4 Table 3 2 CH lt 24 47 gt Connector Descriptions Us 3 4 Table 5 1 Calibration Channel Numbers eere 5 2 National Instruments Corporation vii VXI A0 48XDC User Manual About This Manual This manual describes the mechanical and electrical aspects of the VXI AO 48XDC and contains information concerning its configuration installation and operation The VXI AO 48XDC is designed for precise DC setpoint applications and provides general purpose digital I O How To Use the Manual Set The VXI AO 48XDC User Manual is one piece of the documentation set for your VXI data acquisition VXI DAQ system You could have any of several types of documentation depending on the hardware and software in your system Use the different types of documentation you have as follows e Your VXI DAQ hardware documentation These documents have detailed information a2. Because of the nature of the VXI AO 48XDC calibration circuitry the only calibration adjustment you must make is to adjust the values of the four calibration channels to account for time or temperature related drift of the onboard references These four values are loaded into nonvolatile RAM Note The VXI AO 48XDC is calibrated at the factory to conform to the published specifications No recalibration is necessary for at least one year unless you are operating the module in extreme temperatures To perform calibration you need a voltage and current measuring device that is much more accurate than your VXI AO 48XDC A DMM with an accuracy of a few ppm will generally suffice but be sure to check its specifications Also be sure that no other devices are connected to the National Instruments Corporation 5 1 VXI A0 48XDC User Manual Chapter 5 Calibration VXI AO 48XDC when you calibrate it This will ensure that no ground loops can corrupt the calibration Your VXI AO 48XDC has a switch to prevent you from accidentally writing to the calibration channels Before you can calibrate your module you must move the switch S1 to enable calibration as labeled on the top cover Refer to Figure 2 1 VXI AO 48XDC Parts Locator Diagram for the switch location Table 5 1 lists the channel numbers of the calibration channels Table 5 1 Calibration Channel Numbers Calibration Channel Channel Number Voltage off
3. Prefix Meanings Value n nano 10 9 u micro 10 6 m milli 10 3 k kilo 103 M mega 106 G giga 10 approximately degrees negative of or minus Q ohms per percent plus or minus positive of or plus A A amperes A16 space VXIbus address space equivalent to the VME 64 KB short address space In VXI the upper 16 KB of A16 space is allocated for use by VXI module s configuration registers This 16 KB region is referred to as VXI configuration space National Instruments Corporation G 1 VXI A0 48XDC User Manual Glossary A D address space address window ANSI API backplane base address BCD bit bus byte VXI A0 48XDC User Manual analog to digital A set of 2n memory locations differentiated from other such sets in VXI VMEbus systems by six addressing lines known as address modifiers nis the number of address lines required to uniquely specify a byte location in a given space Valid numbers for n are 16 24 and 32 In VME VXI because there are six address modifiers there are 64 possible address spaces A portion of address space that can be accessed from the application program American National Standards Institute application programming interface An assembly typically a printed circuit board with 96 pin connectors and signal paths that bus the connector pins VXIbus systems will have two sets of bused connectors called the J1 and
4. 3 5 analog output connections 3 5 to 3 7 common questions B 2 current output 3 6 to 3 7 damage due to high common mode voltages warning 3 6 ICH connection as current output figure 3 7 power up condition 3 6 specifications A 1 voltage output 3 6 damage due to high common mode voltages warning 3 6 power up condition 3 6 VCH connection as voltage output figure 3 5 bus interface specifications A 3 C cabling custom 1 5 calibration 5 1 to 5 4 current output calibration 5 3 gain adjustment 5 3 offset adjustment 5 3 external calibration 5 1 to 5 2 channel numbers table 5 2 National Instruments Corporation programming considerations 5 4 self calibration 5 1 voltage output calibration 5 2 to 5 3 gain adjustment 5 2 to 5 3 offset adjustment 5 2 CH lt 0 23 gt connector pin assignments figure 3 2 signal descriptions table 3 4 CH lt 24 47 gt connector pin assignments figure 3 3 signal descriptions table 3 4 to 3 5 circuit breaker self resetting 3 8 4 1 circuitry VXIbus interface 4 2 common questions See questions about VXI AO 48XDC ComponentWorks application software 1 2 configuration See also installation common questions B 1 to B 2 parts locator diagram 2 2 VXIbus logical address 2 3 to 2 4 current output 3 6 to 3 7 calibration gain adjustment 5 3 offset adjustment 5 3 damage due to high common mode voltages warning 3 6 ICH connection as current output
5. A position where a module can be inserted into a VXIbus backplane Each slot provides the 96 pin J connectors to interface with the board P connectors A slot can have one two or three connectors A VXIbus device that provides basic resources to VXI Slots 1 through 12 For B and C size systems the resources provided are CLK10 and MODID For a D size system the Slot 0 device also provides CLK100 Samples per Second Used to express the rate at which a DAQ board samples an analog signal A device whose logical address cannot be set through software that is it is not dynamically configurable A system consists of one or more mainframes that are connected all sharing acommon Resource Manager Each device in a system has a unique logical address RAM installed on a personal computer and used by the operating system as contrasted with onboard RAM G 10 National Instruments Corporation T transfer rate TTL update update rate V V VDC VI VISA VXIbus VXIplug 4 play Systems Alliance National Instruments Corporation G 11 Glossary The rate measured in bytes s at which data is moved from source to destination after software initialization and set up operations the maximum rate at which the hardware can operate Transistor transistor logic The output equivalent of a scan One or more analog or digital output samples Typically the number of output samples in an update is equal to the number o
6. Normally closed or not connected National Instruments driver software for DAQ hardware Execution elements of a block diagram consisting of functions structures and subVIs An undesirable electrical signal Noise comes from external sources such as the AC power line motors generators transformers fluorescent lights soldering irons CRT displays computers electrical storms welders radio transmitters and internal sources such as semiconductors resistors and capacitors Noise corrupts signals you are trying to send or receive A device configured for installation in any slot in a VXIbus mainframe other than Slot 0 Installing such a device into Slot 0 can damage the device the VXIbus backplane or both nonvolatile RAM G 8 National Instruments Corporation 0 operating system optical isolation output limits output settling time PC port PPI ppm R RAM resolution Resource Manager National Instruments Corporation G 9 Glossary Base level software that controls a computer runs programs interacts with users and communicates with installed hardware or peripheral devices The technique of using an optoelectric transmitter and receiver to transfer data without electrical continuity to eliminate high potential differences and transients The upper and lower voltage or current outputs for an analog output channel The output limits determine the polarity and voltage reference settings f
7. figure 3 7 power up condition 3 6 specifications A 1 to A 2 D data transceivers 4 2 DGND signal table 3 5 digital I O connections description 3 8 VXI A0 48XDC User Manual Index overview of digital I O control 4 3 power on states of DIO lines B 2 power up condition 3 8 specifications A 2 to A 3 typical digital I O applications figure 3 7 documentation conventions used in manual x how to use the manual set ix dynamic characteristic specifications A 2 E environment specifications A 4 EPROM serial number 4 3 equipment optional 1 5 external calibration 5 1 to 5 2 channel numbers table 5 2 H hardware installation 2 5 hardware overview block diagram 4 1 data transceivers 4 2 VO connector digital I O control 4 3 nvRAM DAC control 4 2 serial number EPROM 4 3 temperature sensor 4 3 VXIbus interface circuitry 4 2 ICH connection as current output figure 3 7 ICH lt 0 23 gt signal table 3 4 ICH lt 24 47 gt signal table 3 4 installation See also configuration common questions B 1 to B 2 hardware installation 2 5 VXI A0 48XDC User Manual l 2 software installation 2 6 unpacking VXI AO 48XDC 1 5 interface VXIbus circuitry 4 2 T O connector digital I O control 4 3 nvRAM DAC control 4 2 pin assignments CH lt 0 23 gt connector figure 3 2 CH lt 24 47 gt connector figure 3 3 L LabVIEW software 1 3 LabWindows CVI software 1 3 logical addre
8. 3 4 to 3 5 National Instruments Corporation 1 3 Index CH lt 24 47 gt connector figure 3 3 power connections 3 8 software installation 2 6 software programming choices 1 2 to 1 4 National Instruments application software 1 2 to 1 3 NI DAQ driver software 1 3 to 1 4 VXIplug amp play instrument driver 1 4 specifications analog output A 1 bus interface A 3 current output A 1 to A 2 digital I O A 2 to A 3 dynamic characteristics A 2 environment A 4 physical A 3 power requirements A 3 stability A 2 transfer characteristics A 1 voltage output A 1 stability specifications A 2 T technical support C 1 to C 2 telephone support C 2 temperature sensor 4 3 theory of operation See hardware overview timing and digital I O B 2 transfer characteristic specifications A 1 U unpacking VXI AO 48XDC 1 5 V VCH connection as voltage output figure 3 5 VCH lt 0 23 gt signal table 3 4 VCH lt 24 47 gt signal table 3 4 VXI A0 48XDC User Manual Index VirtualBench software 1 3 voltage output 3 6 calibration 5 2 to 5 3 gain adjustment 5 2 to 5 3 offset adjustment 5 2 damage due to high common mode voltages warning 3 6 power up condition 3 6 specifications A 1 VCH connection as voltage output figure 3 5 VXI AO 48XDC block diagram 4 1 custom cabling 1 5 features 1 1 optional equipment 1 5 overview 1 1 requirements for getting started 1 2 software programmi
9. Channel VI to write the new calibration values to the device Use the AO Parameter VI and select the Save Power on State option to save the new calibration channel values to nonvolatile RAM 5 4 National Instruments Corporation Specifications Analog Output This appendix lists the VXI AO 48XDC specifications These specifications are valid for an ambient temperature of 0 to 55 C unless otherwise stated Number of voltage channels 48 Number of current channels 48 Resolution 18 bit Type of DAC tee double buffered self calibrating Transfer Characteristics Voltage Output Relative accuracy INL 3 LSB max DN iiit he tmd 2 LSB max Monotonicity 17 bits guaranteed RANG E cene RR tee ene Ee 10 1 V Output coupling DC Output impedance sess 0 1 Q max Current drives 10 mA max Load capacitance ee ee 10 000 pF max Protection cants ges eee Short circuit to ground Absolute accuracy ee 1 mV max NOISE semaine ein 100 uV rms DC to 1 MHz National Instruments Corporation A 1 VXI A0 48XDC User Manual Appendix A Specifications Current Output Range Hit EE 0 1 to 20 2 mA LY PO sd es n en ee NM nn Source does not reguire external excitation source Output impedance sess 1 GQ min Output compltance ees ee se ee 0 to 10 V Absolut
10. D i O S Lo 1 2 Serial Number S1 3 Logical Address Switch 4 P1 Connector 5 Product Name 6 Assembly Number 7 Status Light 8 Access Light VXI A0 48XDC User Manual Figure 2 1 VXI A0 48XDC Parts Locator Diagram 2 2 National Instruments Corporation Chapter 2 Configuration and Installation VXIbus Logical Address Each module in a VXIbus system is assigned a unique number between 0 and 254 This 8 bit number called the logical address defines the base address for the V XIbus configuration registers located on the module With unique logical addresses each VXIbus module in the system is assigned 64 bytes of configuration space in the upper 16 KB of the A16 address space Logical address 0 is reserved for the Resource Manager in the VXIbus system Because the VXI AO 48XDC cannot act as a Resource Manager do not configure the VXI AO 48XDC with a logical address of 0 The factory default logical address for the VXI AO 48XDC is 5 Some VXIbus modules have dynamically configurable logical addresses These modules have an initial logical address of hex FF or decimal 255 which indicates that they can be dynamically configured The VXI AO 48XDC supports dynamic configuration of its logical address However adding or removing modules can change the logical address of the VXI AO 48XDC Tracking these changes in your application software can be
11. the user or application designer is ultimately responsible for verifying and validating the suitability of National Instruments products whenever National Instruments products are incorporated in a system or application including without limitation the appropriate design process and safety level of such system or application Contents About This Manual How To Use the Manual Set esee ertet en n tee eoe eerie I e eed ix Conventions Used in This Manual ix Chapter 1 Introduction About the VXI AO 48XDC se ee ee Ge GR E ee ee ee ee ee Re GR SR Pe ee 1 1 What You Need to Get Started sise 1 1 Software Programming Choices ss 1 2 National Instruments Application Software esee 1 2 NEDAO Diiver Software i ei ded tee eite tente 1 3 VXIplug amp play Instrument DriVer esse sesse se ee se ee ke Se ee Ge ee ee ee 1 3 Optional Equipment eed ee ER OE EE Edge 1 4 Custom el ia RE e doe t EE cet ds 1 4 Unpacking a dE Rota tee ete pedo dee EER EE 1 5 Chapter 2 Configuration and Installation Module Configuration RR tte ttd arae NE EE SR 2 1 VXlIbus Logical Address dei deeper eerte 2 3 Hardware Installation Seed EER Ee ist e RET AEN NEEN 2 4 Software Install ations tete rere E EE E Yet ie eri ete ve t 2 5 Chapter 3 Signal Connections I O Connector Pin Assignments ss 3 1 Signal Connection Descriptions sesssseeeeeeeeee eene 3 4 Analog Output Signal Connections ss 3
12. a device or module accepts or transfers data after a digital pulse has been received Also called handshaked digital I O light emitting diode An 8 bit number that uniquely identifies each VXIbus device in a system It defines the A16 register addresses of a device and indicates Commander and Servant relationships least significant bit meters The chassis of a VXI system that mechanically contains VXI modules inserted into the backplane ensuring that connectors fit properly and that adjacent modules do not contact each other It also provides cooling airflow and ensures that modules do not disengage from the backplane due to vibration or shock VXI A0 48XDC User Manual Glossary MANTIS MB memory device MITE module MSB multitasking NC NI DAQ node noise non slot 0 device nvRAM VXI A0 48XDC User Manual A National Instruments custom ASIC megabytes of memory A memory storage device that has configuration registers A National Instruments custom ASIC A sophisticated dual channel DMA controller that incorporates the Synchronous MXI and VME64 protocols to achieve high performance block transfer rates Typically a board assembly and its associated mechanical parts front panel optional shields and so on A module contains everything required to occupy one or more slots in a mainframe most significant bit A property of an operating system in which several processes can be run simultaneously
13. about our entire product line Wizards include screen shots that illustrate the steps being described and provide detailed information ranging from simple getting started instructions to advanced topics e Product Manuals A comprehensive searchable library of the latest editions of National Instruments hardware and software product manuals e Hardware Reference Database A searchable database containing brief hardware descriptions mechanical drawings and helpful images of jumper settings and connector pinouts e Application Notes A library with more than 100 short papers addressing specific topics such as creating and calling DLLs developing your own instrument driver software and porting applications between platforms and operating systems National Instruments Corporation C 1 VXI A0 48XDC User Manual Appendix C Technical Support Resources Software Related Resources e Instrument Driver Network A library with hundreds of instrument drivers for control of standalone instruments via GPIB V XI or serial interfaces You also can submit a request for a particular instrument driver if it does not already appear in the library e Example Programs Database A database with numerous non shipping example programs for National Instruments programming environments You can use them to complement the example programs that are already included with National Instruments products Software Library A library with updates and
14. follows Cables and cable assemblies shielded and ribbon e Connector blocks shielded and unshielded screw terminals For more specific information about these products refer to your National Instruments catalogue or call the office nearest you National Instruments offers cables and accessories for you to prototype your application or to use if you frequently change module interconnections You can interface the VXI AO 48XDC to a wide range of test instruments T O racks and modules screw terminal panels and almost any device with a parallel interface The VXI AO 48XDC digital I O connector is a 1 4 National Instruments Corporation Chapter 1 Introduction standard 96 pin DIN header connector Refer to your National Instruments catalogue for specific information Unpacking Your VXI AO 48XDC module is shipped in an antistatic package to prevent electrostatic damage to the module Electrostatic discharge can damage several components on the module To avoid such damage in handling the module take the following precautions e Ground yourself via a grounding strap or by holding a grounded object e Touch the antistatic package to a metal part of your VXIbus chassis before removing the module from the package e Remove the module from the package and inspect the module for loose components or any other sign of damage Notify National Instruments if the module appears damaged in any way Do not install a damaged module
15. 0 gt Uz This icon to the left of bold italicized text denotes a note which alerts you to important information d This icon to the left of bold italicized text denotes a warning which advises you of precautions to take to avoid being electrically shocked bold Bold text denotes the names of menus menu items or dialog box buttons or options bold italic Bold italic text denotes a note caution or warning italic Italic text denotes emphasis a cross reference or an introduction to a key concept monospace Text in this font denotes text or characters that are to be literally input from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions variables file names and extensions and for statements and comments taken from program code NI DAQ NI DAQ refers to the NI DAQ driver software VXI A0 48XDC User Manual X National Instruments Corporation Introduction This chapter describes the VXI AO 48XDC lists what you need to get started describes software programming choices optional equipment and custom cables and explains how to unpack the VXI AO 48XDC About the VXI A0 48XDC Thank you for purchasing the National Instruments VXI AO 48XDC The VXI AO 48XDC is a precise DC setpoint module for the VXIbus The module has 48 voltage output channels and 48 current
16. 5 Voltage rn EE 3 6 Power up Condition 3 6 Current OUtpUt rer e erepto ri de OE GEE 3 6 Power up Condition 3 6 Digital VO Signal Connections sisi 3 8 P vver up ee e EE 3 8 Power Connections rh te e e e ep E t ep ea tesi Re E 3 9 National Instruments Corporation V VXI A0 48XDC User Manual Contents Chapter 4 Hardware Overview Data Transcelvers ete crt e eem VXIbus Interface Circuitry eee I O Conn CtOr i AR EE NVRAM DAC Control Digital I O Control sss Serial Number EPROM eene Temperature Sensor Chapter 5 Calibration NIES dye OE eeu External Calibration eee Voltage Output Calibration eee Offset Adjustment esse ses see se ee ee ee ee Gain Adjustment Current Output Calibration eese Offset Adjustment sees Gain Adjustment Calibration Programming Considerations Appendix A Specifications Appendix B Common Questions Appendix C Technical Support Resources Glossary Index VXI A0 48XDC User Manual vi National Instruments Corporation Contents Figures Figure 1 1 The Relationship between the Programming Environment Your Instrument Driver and Your VXI DAQ Hardware 1 4 Figure 2 1 VXI AO 48XDC Parts Locator Diagram
17. 96 pin DIN x 2 VXI A0 48XDC User Manual Appendix A Specifications Environment Operating Termperatui sa ee see ES Re hning 0 to 55 C ambient Relative humidity eee 596 to 9096 noncondensing Storage Tempet ture nonet 20 to 70 C ambient Relative humidity ee sess 596 to 9096 noncondensing VXI A0 48XDC User Manual A 4 National Instruments Corporation Common Questions This appendix contains commonly asked questions and their answers relating to usage and special features of your VXI AO 48XDC module General Information What if I short circuit the power supply on the VXI AO 48XDC connector Pin C1 of the I O connectors is connected to the 5 V supply from the VXIbus power supply These pins are referenced to GND and can be used to power external circuitry The 5 V supply has a total of 2 A available However the current through each connector pin must be limited to 1 0 A Each power supply has a self resetting protection circuit breaker in series If the circuit breaker protection is activated simply remove the circuit causing the heavy current load and the circuit breaker will reset itself For more information on these output pins see the Digital I O and Power Requirement sections in Appendix A Specifications Installation and Configuration What jumpers switches should I be aware of when configuring my VXI AO 48XDC module The only switch you must configure is the logical address switch Ref
18. B6 A7 B7 A8 B8 Port2_Line lt 7 0 gt Input Output Lines for Port 2 Line 7 is the MSB and Line 0 is the LSB A1 B1 A2 B2 A3 B3 A4 B4 Port3_Line lt 7 0 gt Input Output Lines for Port 3 Line 7 is the MSB and Line 0 is the LSB B lt 32 9 gt ICH lt 24 47 gt Current output channels A lt 32 9 gt VCH lt 24 47 gt Voltage output channels Cl 5 V 5 V This pin is connected to the V XIbus system 5 VDC supply through a self resetting circuit breaker VXI A0 48XDC User Manual 3 4 National Instruments Corporation Chapter 3 Signal Connections Table 3 2 CH lt 24 47 gt Connector Descriptions Continued Pin Signal Name Description C lt 32 9 gt AGND Analog Ground These pins are connected to the VXI AO 48XDC analog ground plane All VXI AO 48XDC ground planes connect to the VXIbus system ground signal C lt 8 2 gt DGND Digital Ground These pins are connected to the VXIbus system ground signal All VXI AO 48XDC ground planes connect to the VXIbus system ground signal Refer to Appendix A Specifications for detailed information Analog Output Signal Connections Both voltage and current outputs are available on the VXI AO 48XDC This section describes how to make connections for each type of output Figure 3 3 shows how to connect the voltage channel VCH outputs VCH Load 10 1 V AGND Floati
19. Condition At power up ports 0 through 3 of the digital I O circuitry on the VXI AO 48XDC are configured as input ports VXI A0 48XDC User Manual 3 8 National Instruments Corporation Chapter 3 Signal Connections Power Connections Pin CT of both I O connectors is connected to the 5 V supply from the VXIbus power supply These pins are referenced to GND and can supply power to external circuitry The 5 V supply has a total of 2 A available However you must limit the current through each connector pin to 1 0 A The 5 V power supply has a self resetting protection circuit breaker in series If the circuit breaker protection is activated simply remove the circuit causing the heavy current load and the circuit breaker will reset itself For more information on these output pins see the Digital I O and Power Requirement sections in Appendix A Specifications Power rating 1 0 A per pin at 5 V 10 4 55 to 5 25 VDC at 1 A per pin A Warning Under no circumstances should you connect these 5 V power pins directly to ground or to any other voltage source on the VXI AO 48XDC or any other device Doing so can damage the VXI AO 48XDC and your VXIbus system National Instruments is not liable for damage resulting from such a connection National Instruments Corporation 3 9 VXI A0 48XDC User Manual Hardware Overview This chapter contains a functional overview of the VXI AO 48XDC and explains the operation of each functio
20. DAQ VXI A0 48XDC User Manual DC Setpoint Module for VXIbus Wy NATIONAL March 1999 Edition gt INSTRUMENTS Part Number 321403B 01 Worldwide Technical Support and Product Information www natinst com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 794 0100 Worldwide Offices Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 284 5011 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 Norway 32 27 73 00 Singapore 2265886 Spain Madrid 91 640 0085 Spain Barcelona 93 582 0251 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2377 1200 United Kingdom 01635 523545 For further support information see the Technical Support Resources appendix To comment on the documentation send e mail to techpubsenat inst com Copyright 1997 1999 National Instruments Corporation All rights reserved Important Information Warranty Copyright Trademarks The VXI AO 48XDC is warranted against defects in materials and workmanship for a period of one year from the date of shipment as evidenced by receipts or other do
21. INES PORT1_LINE4 2 DGND 2 PORT1_LINE7 PORT1_LINE6 1 5 V 1 Figure 3 1 CH lt 0 23 gt Connector Pin Assignments VXI A0 48XDC User Manual 3 2 National Instruments Corporation Chapter 3 Signal Connections A B C VCH 24 32 ICH 24 32 AGND 32 VCH 25 31 ICH 25 31 AGND 31 VCH 26 30 ICH 26 30 AGND 30 VCH 27 29 ICH 27 29 AGND 29 VCH 28 28 ICH 28 28 AGND 28 VCH 29 27 ICH 29 27 AGND 27 VCH 30 26 ICH 30 26 AGND 26 VCH 31 25 ICH 31 25 AGND 25 VCH 32 24 ICH 32 24 AGND 24 VCH 33 23 ICH 33 23 AGND 23 VCH 34 22 ICH 34 22 AGND 22 VCH 35 21 ICH 35 21 AGND 21 VCH 36 20 ICH 36 20 AGND 20 VCH 37 19 ICH 37 19 AGND 19 VCH 38 18 ICH 38 18 AGND 18 VCH 39 17 ICH 39 17 AGND 17 VCH 40 16 ICH 40 16 AGND 16 VCH 41 15 ICH 41 15 AGND 15 VCH 42 14 ICH 42 14 AGND 14 VCH 43 13 ICH 43 13 AGND 13 VCH 44 12 ICH 44 12 AGND 12 VCH 45 11 ICH 45 11 AGND 111 VCH 46 10 ICH 46 10 AGND 10 VCH 47 9 ICH 47 9 AGND 9 PORT2_LINE1 8 PORT2_LINEO 8 DGND 8 PORT2_LINE3 7 PORT2_LINE2 7 DGND 7 PORT 2 LINES 6 PORT2 LINE4 6 DGND 6 PORT2 LINE7 5 PORT2_LINE6 5 DGND 5 PORT3 LINE1 4 PORT3_LINEO 4 DGND 4 PO
22. J2 backplanes or have three sets of bused connectors called the J1 J2 and J3 backplane A memory address that serves as the starting address for programmable registers All other addresses are located by adding to the base address binary coded decimal One binary digit either 0 or 1 The group of conductors that interconnect individual circuitry in a computer Typically a bus is the expansion vehicle to which I O or other devices are connected Eight related bits of data an eight bit binary number Also used to denote the amount of memory required to store one byte of data G 2 National Instruments Corporation C C channel Configuration Registers D A DAQ default setting Glossary Celsius Pin or wire lead to which you apply or from which you read the analog or digital signal Analog signals can be single ended or differential For digital signals you group channels to form ports Ports usually consist of either four or eight digital channels 1 A set of registers through which the system can identify a module device type model manufacturer address space and memory requirements In order to support automatic system and memory configuration the VXIbus specification requires that all VXIbus devices have a set of such registers 2 The A16 registers of a device that are required for the system configuration process digital to analog data acquisition 1 Collecting and measuring electrical signa
23. Q products software and your computer to create a standalone instrument with the added benefit of the processing display and storage capabilities of your computer VirtualBench instruments load and save waveform data to disk in the same forms that can be used in popular spreadsheet programs and word processors Using ComponentWorks LabVIEW LabWindows CVI or VirtualBench software will greatly reduce the development time for your data acquisition and control application NI DAQ Driver Software The NI DAQ driver software is included at no charge with all National Instruments DAQ hardware NI DAQ is not packaged with accessory products NI DAQ has an extensive library of functions that you can call from your application programming environment These functions include routines for analog input A D conversion buffered data acquisition high speed A D conversion analog output D A conversion waveform generation digital I O counter timer operations SCXI RTSI self calibration messaging and acquiring data to extended memory NI DAQ has both high level DAQ I O functions for maximum ease of use and low level DAQ I O functions for maximum flexibility and performance Examples of high level functions are streaming data to disk or acquiring a certain number of data points An example of a low level function is writing directly to registers on the DAQ device NI DAQ does not sacrifice the performance of National Instruments DAQ devices be
24. RT3_LINE3 3 PORT3_LINE2 3 DGND 3 PORT3 LINE5 2 PORT3_LINE4 2 DGND 2 PORT3 LINE7 1 PORT3_LINE6 1 5 V 1 National Instruments Corporation Figure 3 2 CH lt 24 47 gt Connector Pin Assignments VXI A0 48XDC User Manual Chapter 3 Signal Connections Signal Connection Descriptions Tables 3 1 and 3 2 contain descriptions of the signal connections Table 3 1 CH lt 0 23 gt Connector Descriptions Pin Signal Name Description A5 B5 A6 B6 A7 B7 A8 B8 PortO_Line lt 7 0 gt Input Output Lines for Port 0 Line 7 is the MSB and Line 0 is the LSB A1 B1 A2 B2 A3 B3 Ad B4 Portl_Line lt 7 0 gt Input Output Lines for Port 1 Line 7 is the MSB and Line 0 is the LSB B lt 32 9 gt ICH lt 0 23 gt Current output channels A lt 32 9 gt VCH lt 0 23 gt Voltage output channels Cl 5 V 5 V This pin is connected to the V XIbus system 5 VDC supply through a self resetting circuit breaker C lt 32 9 gt AGND Analog Ground These pins are connected to the VXI AO 48XDC analog ground plane All VXI AO 48XDC ground planes connect to the VXIbus system ground signal C lt 8 2 gt DGND Digital Ground These pins are connected to the VXIbus system ground signal All VXI AO 48XDC ground planes connect to the VXIbus system ground signal Table 3 2 CH lt 24 47 gt Connector Descriptions Pin Signal Name Description A5 BS A6
25. Switch Set to Logical Address Hex CO Figure 2 2 Logical Address Selection Hardware Installation This section contains general installation instructions for the VXI AO 48XDC Consult your VXIbus mainframe user manual or technical reference manual for specific instructions and warnings 1 Plug in your mainframe before installing the VXI AO 48XDC The power cord grounds the mainframe and protects it from electrical damage while you are installing the module Do not turn on the mainframe VXI A0 48XDC User Manual 2 4 National Instruments Corporation Chapter 2 Configuration and Installation d Warning 7o protect both yourself and the mainframe from electrical hazards do not turn on the mainframe until you are finished installing the VXI AO 48XDC module 2 Remove or open any doors or covers blocking access to the mainframe slots 3 If you are installing the VXI AO 48XDC into a D size mainframe first install an appropriate support for C size modules 4 Insert the VXI AO 48XDC in the slot you have selected a Align the top and bottom of the module with the card edge guides inside the mainframe b Slowly push the VXI AO 48XDC straight into the slot until its plug connectors rest on the backplane receptacle connectors c Using evenly distributed pressure slowly press the VXI AO 48XDC straight in until it seats in the expansion slot d Make sure the front panel of the VXI AO 48 XDC is even with the front pan
26. Under the copyright laws this publication may not be reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation ComponentWorks CVI LabVIEW Measure natinst com NI DAQ NI VISA RTSI SCXI and VirtualBench are trademarks of National Instruments Corporation Product and company names mentioned herein are trademarks or trade names of their respective companies WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS National Instruments products are not designed with components and testing for a level of reliability suitable for use in or in connection with surgical implants or as critical components in any life support systems whose failure to perform can reasonably be expected to cause significant injury to a human Applications of National Instruments products involving medical or clinical treatment can create a potential for death or bodily injury caused by product failure or by errors on the part of the user or application designer Because each end user system is customized and differs from National Instruments testing platforms and because a user or application designer may use National Instruments products in combination with other products in a manner not evaluated or contemplated by National Instruments
27. ay instrument driver Both NI DAQ and the V XIplug 4 play instrument driver access the VXI DAQ hardware through the VISA driver software National Instruments Application Software VXI AO 48XDC User Manual ComponentWorks contains tools for data acquisition and instrument control built on NI DAQ driver software ComponentWorks provides a higher level programming interface for building virtual instruments through standard OLE controls and DLLs With ComponentWorks you can use all of the configuration tools resource management utilities and interactive control utilities included with NI DAQ LabVIEW features interactive graphics a state of the art user interface and a powerful graphical programming language The LabVIEW Data Acquisition VI Library a series of VIs for using LabVIEW with National Instruments DAQ hardware is included with LabVIEW The LabVIEW Data Acquisition VI Library is functionally equivalent to the NI DAQ software LabWindows CVI features interactive graphics a state of the art user interface and uses the ANSI standard C programming language The LabWindows CVI Data Acquisition Library a series of functions for using LabWindows CVI with National Instruments DAQ hardware is included 1 2 National Instruments Corporation Chapter 1 Introduction with the NI DAQ software kit The LabWindows CVI Data Acquisition Library is functionally equivalent to the NI DAQ software VirtualBench features VIs that combine DA
28. bout the VXI DAQ hardware that plugs into or is connected to your computer Use these documents for hardware installation and configuration instructions specification information about your VXI DAQ hardware and application hints e Software documentation You may have both application software and driver software documentation National Instruments application software includes ComponentWorks LabVIEW LabWindows CVI Measure and VirtualBench National Instruments driver software includes NI DAQ and VXI plug 4 play instrument drivers After you set up your hardware system use either your application or driver software documentation to help you write your application If you have a large complicated system it is worthwhile to look through the software documentation before you configure your hardware e Accessory installation guides or manuals If you are using accessory products read the terminal block and cable assembly installation guides or accessory board user manuals They explain how to physically connect the relevant pieces of the system Consult these guides when you are making your connections National Instruments Corporation ix VXI A0 48XDC User Manual About This Manual Conventions Used in This Manual The following conventions are used in this manual lt gt Angle brackets containing numbers separated by an ellipsis represent a range of values associated with a bit or signal name for example PortO_Line lt 7
29. cause it lets multiple devices operate at their peak performance NI DAQ maintains a consistent software interface among its different versions so that you can change platforms with minimal modifications to your code VXI plug amp play Instrument Driver National Instruments distributes V XIplug 4 play instrument drivers free of charge VXI plug amp play instrument drivers are one level above the NI DAQ device driver and contain high level software functions whose architecture is specified by the VXIplug amp play Systems Alliance The VXIplug 4 play standards increase interoperability with other vendors and ensure that drivers are designed and presented in a consistent fashion that facilitates National Instruments Corporation 1 3 VXI A0 48XDC User Manual Chapter 1 Introduction ease of use Refer to Figure 1 1 to see the relationship between your software components ComponentWorks Other Application LabView Development Environments LabWindows CVI or VirtualBench VXI plug amp play Instrument Driver NI DAQ Driver Software VISA i VXI DAQ Hardware Figure 1 1 The Relationship between the Programming Environment Your Instrument Driver and Your VXI DAQ Hardware Optional Equipment Custom Cabling VXI A0 48XDC User Manual National Instruments offers a variety of products to use with your VXI AO 48XDC module including cables connector blocks and other accessories as
30. cumentation National Instruments will at its option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor The media on which you receive National Instruments software are warranted not to fail to execute programming instructions due to defects in materials and workmanship for a period of 90 days from date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period National Instruments does not warrant that the operation of the software shall be uninterrupted or error free A Return Material Authorization RMA number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty National Instruments believes that the information in this document is accurate The document has been carefully reviewed for technical accuracy In the event that technical or typographical errors exist National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition The reader should consult National Instruments if errors are suspected In
31. d current within 0 5 s of power up board reset e Output current at user defined value to full accuracy within 7 s of power up board reset 3 6 National Instruments Corporation Chapter 3 Signal Connections Figure 3 4 shows how to connect a current channel ICH as a current output ICH 0 1 to 20 2 mA Load AGND VXI AO 48XDC Figure 3 4 ICH Connection as a Current Output National Instruments Corporation 3 7 VXI A0 48XDC User Manual Chapter 3 Signal Connections Digital 1 0 Signal Connections Figure 3 5 illustrates signal connections for three typical digital I O applications Port 0 GES M Line lt 7 0 gt R TTL Signal dd 45V se Lo Line lt 7 0 gt Switch T DGND VO Connector VXI AO 48XDC Figure 3 5 Digital VO Connections In Figure 3 5 port 0 is configured for digital output and port 1 is configured for digital input Digital input applications include receiving TTL signals and sensing external device states such as the switch in Figure 3 5 Digital output applications include sending TTL signals and driving external devices such as the LED shown in Figure 3 5 Uz Note The VXI AO 48XDC allows line by line control of digital I O connections Refer to Appendix A Specifications for a list of the digital I O signal ratings Power up
32. e accuracy 7 uA max NEE 1 pA rms DC to 1 MHz Protection cette Short circuit and open circuit Dynamic Characteristics Stability Digital 1 0 VXI A0 48XDC User Manual Settling time including channel latency Accuracy 0 1 0 01 0 001 5 ms typ 10 ms typ 40 ms typ 12 ms max 24 ms max 100 ms max Offset temperature coefficient Voltage ments 5 HV C eli sta eer stresse 10 nA C Gain temperature coefficient Xolt ge is ei Mara 1 ppm C CUTEN tica dd masies 2 ppm C Number of channels 32 I O Compatibility eese TTL A 2 National Instruments Corporation Appendix A Specifications Digital logic levels Level Min Max Input low voltage 0 8 V Input high voltage 2 0 V Output low voltage 0 4 V IoL 12 mA Output high voltage 2 4 V lou 8 mA Input leakage current 10 pA Bus Interface Type n OE ER nd Slave Power Reduirement HOV ee EO mite he 2A REELE E 800 mA SI Vase beta enu 800 mA X24 EE 100 mA ME AE UB ads 100 mA Note These power usage figures do not include the power used by external devices that are connected to the fused supply present on the I O connector They assume that all voltage and current outputs are fully loaded Physical Dimensions VO connector National Instruments Corporation A 3 VXI C size single slot
33. el of the mainframe 5 Tighten the retaining screws on the top and bottom edges of the front panel 6 Replace or close any doors or covers to the mainframe Software Installation If you are using a V XIplug amp play instrument driver follow the instructions in the Setup Utility on the diskettes that were included with your VXI DAQ hardware This user manual assumes that the VISA software is installed If VISA is not installed you must get the VISA software from the supplier of your VXIbus controller If you are using NI DAQ refer to your release notes Find the installation section for your operating system and follow the instructions given there If you are using ComponentWorks LabVIEW LabWindows CVI or VirtualBench refer to the appropriate release notes to install your application software After you have installed your application software refer to the NI DAQ release notes and follow the instructions given there for your operating system and application software National Instruments Corporation 2 5 VXI A0 48XDC User Manual Signal Connections This chapter provides connection instructions for the signals on the VXI AO 48XDC I O connector A Warning Connections that exceed any of the maximum ratings of input or output signals on the VXI AO 48XDC can damage the VXI AO 48XDC module and the VXIbus system Maximum input ratings for each signal are given in this chapter under the discussion of that signal National I
34. er to the VXIbus Logical Address section of Chapter 2 Configuration and Installation for this information Which National Instruments document should I read first to get started using DAQ software The release notes document for your application or driver software is always the best starting place What version of NI DAQ must I have to program my VXI AO 48XDC module You must have NI DAQ for PC compatibles version 5 0 or higher for your VXI AO 48XDC module National Instruments Corporation B 1 VXI A0 48XDC User Manual Appendix B Common Questions What is the best way to test my module without having to program it The NI DAQ Test Panels provide a quick and easy way for you to test the functionality of your module To run Test Panels from Measurement amp Automation Explorer go to the Devices and Interfaces view and right click on the icon for the module to be tested Select Properties In the System panel click the Run Test Panels button Timing and Digital 1 0 Analog Output VXI A0 48XDC User Manual What are the power on states of the DIO lines on the I O connector At system power on and reset all ports are configured as inputs Refer to the Digital I O Control section in Chapter 4 Hardware Overview for more information What are the power on states of the voltage and current outputs At system power on and reset all analog outputs are at the values you last saved How fast does the VXI AO 48XDC module sca
35. f channels in the output group For example one pulse from the update clock produces one update which sends one new sample to every analog output channel in the group The number of output updates per second volts volts direct current Virtual Instrument 1 A combination of hardware and or software elements typically used with a PC that has the functionality of a classic stand alone instrument 2 A LabVIEW software module VI which consists of a front panel user interface and a block diagram program A new driver software architecture developed by National Instruments to unify instrumentation software GPIB DAQ and VXI It has been accepted as a standard for VXI by the V XIplug amp play Systems Alliance VMEbus eXtensions for Instrumentation A group of VXI developers dedicated to making VXI devices as easy to use as possible primarily by simplifying software development VXI A0 48XDC User Manual Glossary W waveform Multiple voltage readings taken at a specific sampling rate wire Data path between nodes word serial The simplest required communication protocol used by message based devices in the VXIbus system It uses the A16 communication registers to transfer data with a simple polling handshake method VXI A0 48XDC User Manual G 12 National Instruments Corporation Index Numbers 5 V signal CH lt 0 23 gt connector table 3 4 CH lt 24 47 gt connector table 3 4 A AGND signal table
36. ftware Temperature Sensor The onboard temperature sensor measures the air temperature flowing over the module This sensor is positioned near the onboard precision voltage reference which can be affected by extreme temperatures This sensor has a serial digital interface National Instruments Corporation 4 3 VXI A0 48XDC User Manual Calibration This chapter discusses the calibration procedures for your VXI AO 48XDC module Calibration is the process of minimizing measurement and output voltage errors by making small circuit adjustments On the VXI AO 48XDC you write values to four calibration channels to make these adjustments Self Calibration The VXI AO 48XDC performs continuous self calibration In addition to the 48 accessible voltage channels and 48 accessible current channels there are two voltage channels and two current channels that get scanned and refreshed along with the others These four channels are the voltage offset channel the voltage gain channel the current offset channel and the current gain channel The outputs of these four channels are compared to onboard references and the 18 bit DAC s offset and gain are adjusted to minimize the errors of the four outputs Since the VXI AO 48XDC has excellent channel to channel matching of offset and gain errors minimizing the errors of the four calibration channels also minimizes the errors for all the voltage and current outputs External Calibration
37. ia one or more V XIbus extended controllers The computer then exerts overall control over VXIbus system operations A voltage pulse from an external source that triggers an event such as A D conversion Signal sources with voltage signals that are not connected to an absolute reference or system ground Also called nonreferenced signal sources Some common example of floating signal sources are batteries transformers or thermocouples feet VXI A0 48XDC User Manual Glossary function GND H hardware hardware triggering hex IC in INL input range instrument driver VXI A0 48XDC User Manual A set of software instructions executed by a single line of code that may have input and or output parameters and returns a value when executed ground signal or bit The physical components of a computer system such as the circuit boards plug in boards chassis enclosures peripherals cables and so on A form of triggering where you set the start time of an acquisition and gather data at a known position in time relative to a trigger signal hexadecimal hertz A unit of frequency equal to one cycle per second integrated circuit inches Integral Nonlinearity A measure in LSB of the worst case deviation from the ideal A D or D A transfer characteristic of the analog I O circuitry The difference between the maximum and minimum voltages an analog input channel can measure at a gain of 1 The input range
38. into your V XIbus backplane e Never touch the exposed pins of connectors National Instruments Corporation 1 5 VXI A0 48XDC User Manual Configuration and Installation This chapter describes how to configure and install your VXI AO 48XDC module Module Configuration This section describes how to configure the VXIbus logical address on your VXI AO 48XDC Figure 2 1 shows the VXI AO 48XDC as it appears with the component side facing you The drawing shows the location of various module components including the logical address switch National Instruments Corporation 2 1 VXI AO 48XDC User Manual Chapter 2 Configuratio n and Installation acras ur UB P7064 SCH BB UN BT es far Ke acon JE ncs acon jy SE Els El Els E Els pn ep Es E E g a gt 30 Za UDO 3 Ce 3 s Es OS E KR de H icon d oe D 8 8 g ki 8 8 E SY Sp SU Jos Sec gt i O DE v eH 8 sien 8 8 E gS i BC fei amat pr Z geo i 8 881 EH x ts Ale OL Se Al U CI d h 8 o d no ds a 7 O Als TE sd Je Al L d H H S Seel g GE ui puces ia cl vag valse Bees P ancses 5 Less Ic E om E
39. ion dynamic range dynamically configured device E embedded controller EPROM event external controller external trigger F floating signal sources ft National Instruments Corporation G 5 Glossary A method of automatically assigning logical addresses to VXIbus devices at system startup or other configuration times Each slot can contain one or more devices Different devices within a slot can share address decoding hardware The ratio of the largest signal level a circuit can handle to the smallest signal level it can handle usually taken to be the noise level normally expressed in dB A device that has its logical address assigned by the Resource Manager A VXI device initially responds at Logical Address 255 when its MODID line is asserted The Resource Manager subsequently assigns it a new logical address which the device responds to until powered down An intelligent CPU controller interface plugged directly into the VXI backplane giving it direct access to the VXIbus It must have all of its required V XI interface capabilities built in Erasable Programmable Read Only Memory ROM that can be erased usually by ultraviolet light exposure and reprogrammed Signals or interrupts generated by a device to notify another device of an asynchronous event The contents of events are device dependent In this configuration a plug in interface board in a computer is connected to the VXI mainframe v
40. is a scalar value not a pair of numbers By itself the input range does not uniquely determine the upper and lower voltage limits An input range of 10 V could mean an upper limit of 10 V and a lower of 0 V or an upper limit of 5 V and a lower limit of 5 V The combination of input range polarity and gain determines the input limits of an analog input channel For some boards jumpers set the input range and polarity while you can program them for other boards Most boards have programmable gains A set of high level software functions that controls a specific VXI or RS 232 programmable instrument or a specific plug in DAQ board G 6 National Instruments Corporation interrupt interrupt level interval scanning VO KB kS L latched digital I O LED logical address LSB m mainframe National Instruments Corporation G 7 Glossary A computer signal indicating that the CPU should suspend its current task to service a designated activity The relative priority at which a device can interrupt Scanning method where there is a longer interval between scans than there is between individual channels comprising a scan Input output The transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control interfaces kilobytes 1 024 bytes when referring to memory 1 000 samples A type of digital acquisition generation where
41. lot devices and multiple device modules can operate on a VXIbus system as a single device Some examples of devices are computers multimeters multiplexers oscillators operator interfaces and counters A collection of digital input ports You can associate each group with its own clock rates handshaking modes buffer configurations and so on A port cannot belong to more than one group A collection of digital output ports You can associate each group with its own clock rates handshaking modes buffer configurations and so on A port cannot belong to more than one group A TTL level signal having two discrete levels high and low Deutsche Industrie Norme digital input output dual inline package The addition of Gaussian noise to an analog input signal Dynamic Link Library A software module in Microsoft Windows containing executable code and data that can be called or used by Windows applications or by other DLLs Functions and data in a DLL are loaded and linked at run time when they are referenced by a Windows application or other DLLs direct memory access Dynamic RAM Software that controls a specific hardware device such as a DAQ board Memory that can be sequentially but not simultaneously accessed by more than one controller or processor Also known as shared memory Memory that can be simultaneously accessed by more than one controller or processor G 4 National Instruments Corporation dynamic configurat
42. ls from sensors transducers and test probes or fixtures and inputting them to a computer for processing 2 Collecting and measuring the same kinds of electrical signals with A D and or DIO boards plugged into a computer and possibly generating control signals with D A and or DIO boards in the same computer A default parameter value recorded in the driver In many cases the default input of a control is a certain value often 0 that means use the current default setting For example the default input for a parameter may be do not change current setting and the default setting may be no AMUX 64T boards If you do change the value of such a parameter the new value becomes the new setting You can set default settings for some parameters in the configuration utility or by manually using switches located on the device National Instruments Corporation G 3 VXI A0 48XDC User Manual Glossary device digital input group digital output group digital trigger DIN DIO DIP dithering DLL DMA DRAM drivers driver software dual access memory dual ported memory VXI A0 48XDC User Manual 1 A plug in data acquisition board card or pad that can contain multiple channels and conversion devices Plug in boards PCMCIA cards and devices such as the DAQPad 1200 which connects to your computer parallel port are all examples of DAQ devices 2 A component of a VXIbus system normally one VXIbus board However multiple s
43. n channels The VXI AO 48XDC has one 18 bit DAC that is time division multiplexed to create the 48 voltage and 48 current output channels Thus a channel can change value a maximum of 5 ms after it has been updated by software How are the voltage and current outputs related They are completely independent of each other B 2 National Instruments Corporation Technical Support Resources This appendix describes the comprehensive resources available to you in the Technical Support section of the National Instruments Web site and provides technical support telephone numbers for you to use if you have trouble connecting to our Web site or if you do not have internet access NI Web Support To provide you with immediate answers and solutions 24 hours a day 365 days a year National Instruments maintains extensive online technical support resources They are available to you at no cost are updated daily and can be found in the Technical Support section of our Web site at www natinst com support Online Problem Solving and Diagnostic Resources e KnowledgeBase A searchable database containing thousands of frequently asked questions FAQs and their corresponding answers or solutions including special sections devoted to our newest products The database is updated daily in response to new customer experiences and feedback e Troubleshooting Wizards Step by step guides lead you through common problems and answer questions
44. nal unit making up the module The block diagram in Figure 4 1 illustrates the key functional components of the VXI AO 48XDC module PAS Control Dtack VXI Address VXI Interface VXI Data Logic Main Voltage 48 Voltage M Output gt Control DAC Circuit Circuit X48 one 18 bit Out Lines L3 DAC 5 o E Main Current 48 o 2 Current Output ad S nvRAM La RAM Data Circuit Circuit X48 DAC o Control RAM AddriCul VSRAM 4 Digital DIO Ports lt 3 0 gt io a gt 5V Sp 2 0 A Self resetting Circuit Breaker N 7 Figure 4 1 VXI AO 48XDC Block Diagram The VXIbus I O channel consists of an address bus a data bus interrupt lines and several control and support signals Data Transceivers The data transceivers control the transmission of data to and from the VXIbus National Instruments Corporation 4 1 VXI A0 48XDC User Manual Chapter 4 Hardware Overview VXIbus Interface Circuitry 1 0 Connector An onboard switch setting determines the VXI AO 48XDC logical address The address decoder which is part of the interface circuitry monitors the VXIbus address If the VXIbus address matches the module s selected I O logical address the module is enabled and the corresponding register on the VXI AO 48XDC is accessed In addition the VXIbus interface circuitry monitors and tra
45. ng Load Figure 3 3 VCH Connection as a Voltage Output National Instruments Corporation 3 5 VXI A0 48XDC User Manual Chapter 3 Signal Connections Voltage Output You can connect a floating load to your VXI AO 48XDC module at the voltage output channel AN Warning Because the VXI AO 48XDC module is not electrically isolated from high voltages a load with high common mode voltages can damage the VXI AO 48XDC module National Instruments is not liable for any damages resulting from any such signal connections Current Output Your VXI AO 48XDC module has a bipolar voltage range of 10 1 to 10 1 V Maximum load current is 10 mA for 16 bit linearity Power up Condition e Output voltage at user defined value to full accuracy within 1 s of power up board reset You can connect a floating or grounded load to your VXI AO 48XDC module at the current output channel You do not need an external floating power supply to complete the controlled current loop You can control the current loop from 0 1 to 20 2 mA The compliance for the current loop is 0 V to 10 VDC A Warning Because the VXI AO 48XDC module is not electronically isolated from high voltages a load with high common mode voltages may damage the VXI AO 48XDC module National Instruments is not liable for any damages resulting from any such signal connections VXI AO 48XDC User Manual Power up Condition e Output current within 1 1 mA maximum of user define
46. ng choices 1 2 to 1 4 National Instruments application software 1 2 to 1 3 NI DAQ driver software 1 3 to 1 4 VXI plug amp play instrument driver 1 4 unpacking 1 5 VXIbus interface circuitry 4 2 VXIbus logical address 2 3 to 2 4 configuration 2 3 switch settings figure 2 4 VXIplug amp play instrument driver 1 4 VXI A0 48XDC User Manual l 4 National Instruments Corporation
47. no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NATIONAL INSTRUMENTS MAKES NO WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CUSTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA PROFITS USE OF PRODUCTS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty provided herein does not cover damages defects malfunctions or service failures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control
48. nsmits the VXIbus interface circuitry signals All I O is transmitted through two standard 96 pin header connectors See Chapter 2 Configuration and Installation and Chapter 3 Signal Connections for additional information nvRAM DAC Control Digital 1 0 Control VXI AO 48XDC User Manual The VXI AO 48XDC has one 18 bit DAC that is time division multiplexed to create the 48 voltage and 48 current output channels Each voltage and current channel has a track and hold circuit to maintain the channel value between DAC updates Data is stored in an nvRAM nonvolatile RAM The nvRAM DAC control reads the DAC channel data stored in the nvRAM and updates the DAC periodically The nvRAM DAC control also controls the analog demultiplexing circuits to route the DAC output to the correct analog output channel You can save nvRAM data thus allowing power on values on all analog channels The VXI AO 48XDC has 32 digital I O lines configured as four 8 bit ports You can configure each line independently as an input or output The DIO lines have 12 mA of sink capability and 8 mA of source capability All digital lines are TTL compatible At power up all digital lines are configured as inputs 4 2 National Instruments Corporation Chapter 4 Hardware Overview Serial Number EPROM The serial number EPROM is a nonvolatile memory used to hold the module serial number as well as some other identification information used by the driver so
49. nstruments is not liable for any damages resulting from any incorrect signal connections 1 0 Connector Pin Assignments Figures 3 1 and 3 2 show the pin assignments for the VXI AO 48XDC I O connectors National Instruments Corporation 3 1 VXI A0 48XDC User Manual Chapter 3 Signal Connections B C VCH 0 ICH 0 32 AGND 32 VCH 1 ICH 1 31 AGND 31 VCH 2 ICH 2 30 AGND 30 VCH 3 ICH 3 29 AGND 29 VCH 4 ICH 4 28 AGND 28 VCH 5 ICH 5 27 AGND 27 VCH 6 ICH 6 26 AGND 26 VCH 7 ICH 7 25 AGND 25 VCH 8 ICH 8 24 AGND 24 VCH 9 ICH 9 23 AGND 23 VCH 10 ICH 10 22 AGND 22 VCH 11 ICH 11 21 AGND 21 VCH 12 ICH 12 20 AGND 20 VCH 13 ICH 13 19 AGND 19 VCH 14 ICH 14 18 AGND 18 VCH 15 ICH 15 17 AGND 17 VCH 16 ICH 16 16 AGND 16 VCH 17 ICH 17 15 AGND 15 VCH 18 ICH 18 14 AGND 14 VCH 19 ICH 19 13 AGND 13 VCH 20 ICH 20 12 AGND 12 VCH 21 ICH 21 111 AGND 11 VCH 22 ICH 22 10 AGND 10 VCH 23 ICH 23 9 AGND 9 PORTO_LINE1 PORTO_LINEO 8 DGND 8 PORTO LINE3 PORTO LINE2 7 DGND Ke PORTO LINES PORTO_LINE4 6 DGND 6 PORTO LINE7 PORTO_LINE6 5 DGND 5 PORT1_LINE1 PORT1_LINEO 4 DGND 4 PORT1_LINE3 PORT1_LINE2 3 DGND 3 PORT1 L
50. onnecting them together This will reduce the sensitivity of the calibration process to interchannel mismatch When you are done save the calibration channel values to nonvolatile RAM National Instruments Corporation 5 8 VXI A0 48XDC User Manual Chapter 5 Calibration Calibration Programming Considerations VXI A0 48XDC User Manual To perform the above mentioned calibration with the C programming language use the NI DAQ AO VWrite and AO Change Parameter APIs Use the AO Change Parameter function and the associated ND OUTPUT TYPE parameter to select either the voltage calibration channels or the current calibration channels Use the AO_VWrite function to write the new calibration values to the device Note that the AO Write function does not support the calibration channels because this function s interface cannot specify the required precision Use the Set DAQ Device Info function and the associated ND AO48XDC SET POWERUP STATE parameter to save the new calibration channel values to nonvolatile RAM Refer to the NI DAQ Function Reference Manual for PC Compatibles for more information on using these functions to calibrate your VXI AO 48XDC module To perform the above mentioned calibration with LabVIEW use the AO Update Channel VI and the AO Hardware Config VI Use the channel type terminal of the AO Hardware Config VI to select either the voltage calibration channels or the current calibration channels Use the AO Update
51. or a board The amount of time required for the analog output voltage to reach its final value within specified limits personal computer 1 A communications connection on a computer or a remote controller 2 A digital port consisting of four or eight lines of digital input and or output programmable peripheral interface parts per million random access memory The smallest signal increment that can be detected by a measurement system Resolution can be expressed in bits in proportions or in percent of full scale For example a system has 12 bit resolution one part in 4 096 resolution and 0 0244 percent of full scale A message based Commander located at logical address 0 which provides configuration management services such as address map configuration Commander and Servant mappings and self test and diagnostics management VXI A0 48XDC User Manual Glossary responses RTSI settling time signal slot slot 0 device S s statically configured device system system RAM VXI A0 48XDC User Manual Signals or interrupts generated by a device to notify another device of an asynchronous event Responses contain the information in the Response register of a sender Real Time System Integration seconds sample The amount of time required for a voltage to reach its final value within specified limits Any communication between message based devices consisting of a write to a Signal register
52. output channels In addition the module has 32 digital I O lines You can use the VXI AO 48XDC in a wide variety of DC setpoint and digital applications With the VXI AO 48XDC your VXIbus system can serve as a digital I O system controller for laboratory testing production testing and industrial process monitoring and control Use your VXI AO 48XDC module to e Generate experimental stimuli e Generate analog functions e Connect to a variety of signal types including Electromechanical relays LEDs Optically isolated solid state relays and I O module mounting racks Detailed specifications for the VXI AO 48XDC are in Appendix A Specifications What You Need to Get Started To set up and use your VXI AO 48XDC you will need the following Q VXI AO 48XDC module L VXI AO 48XDC User Manual National Instruments Corporation 1 1 VXI A0 48XDC User Manual Chapter 1 Introduction C One of the following software packages and documentation ComponentWorks LabVIEW for Windows LabWindows CVI for Windows Measure NI VISA NI DAQ for PC compatibles VirtualBench VXI plug amp play instrument driver Q Your VXIbus system Software Programming Choices There are several options to choose from when programming your National Instruments VXI DAQ hardware You can use LabVIEW LabWindows CVI ComponentWorks VirtualBench or other application development environments with either NI DAQ or the VXIplug amp pl
53. patches to application software links to the latest versions of driver software for National Instruments hardware products and utility routines Worldwide Support VXI A0 48XDC User Manual National Instruments has offices located around the globe Many branch offices maintain a Web site to provide information on local services You can access these Web sites from www natinst com worldwide If you have trouble connecting to our Web site please contact your local National Instruments office or the source from which you purchased your National Instruments product s to obtain support For telephone support in the United States dial 512 795 8248 For telephone support outside the United States contact your local branch office Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 284 5011 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 Norway 32 27 73 00 Singapore 2265886 Spain Madrid 91 640 0085 Spain Barcelona 93 582 0251 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2377 1200 United Kingdom 01635 523545 C 2 www natinst com Glossary
54. set Voltage channel 48 Voltage gain Voltage channel 49 Current offset Current channel 48 Current gain Current channel 49 Voltage Output Calibration Offset Adjustment Gain Adjustment VXI AO 48XDC User Manual There are two adjustments to make for the voltage outputs offset and gain You should perform offset adjustment first It is a good idea to calibrate twice because a large change in the voltage gain channel value could impact the accuracy of the offset calibration To calibrate the offset set one of the voltage output channels to 0 V and measure it with a precise voltmeter Then change the voltage offset channel value until the output is zero The voltage you write to the voltage offset channel will be close to zero and increasing it will lower the voltage you measure To calibrate the gain set the voltage output channel to a voltage near full scale such as 10 V Then change the voltage gain channel value until the output that you measure is as close as possible to the voltage that you wrote to the output channel The voltage you write to the voltage gain channel will be close to 10 V and increasing it will lower the magnitude of the voltage you measure 5 2 National Instruments Corporation Chapter 5 Calibration You can also calibrate using several output channels instead of just one by averaging channels together Do this by writing the values to all the channels you wish to average and using a resisti
55. ss VXIbus 2 3 to 2 4 configuration 2 3 switch settings 2 4 manual See documentation module configuration See configuration NI DAQ driver software 1 3 to 1 4 nvRAM DAC control 4 2 0 optional equipment 1 5 P physical specifications A 3 pin assignments CH lt 0 23 gt connector figure 3 2 CH lt 24 47 gt connector figure 3 3 PortO_Line lt 7 0 gt signal table 3 4 Portl Lines7 05 signal table 3 4 Port2_Line lt 7 0 gt signal table 3 4 National Instruments Corporation Port3_Line lt 7 0 gt signal table 3 4 power connections connecting directly to ground warning 3 8 description 3 8 power requirement specifications A 3 power up condition current output 3 6 digital I O connections 3 8 voltage output 3 6 programming considerations for calibration 5 4 Q questions about VXI AO 48XDC analog output B 2 general information B 1 installation and configuration B 1 to B 2 timing and digital I O B 2 S self calibration 5 1 serial number EPROM 4 3 signal connections analog output connections 3 5 to 3 7 current output 3 6 to 3 7 VCH connection as voltage output figure 3 5 voltage output 3 6 digital I O connections 3 7 to 3 8 power up condition 3 8 exceeding maximum ratings warning 3 1 I O connector pin description CH lt 0 23 gt connector descriptions table 3 2 CH lt 0 23 gt connector figure 3 2 CH lt 24 47 gt connector descriptions table
56. troublesome In many cases static configuration of the logical address is easier For example ensure that no other statically configurable V XIbus modules have a logical address of 5 If they do change the logical address setting of either the VXI AO 48XDC or the other module so that every module in the system has a different logical address To change the VXI AO 48XDC logical address modify the setting of the 8 bit DIP switch labeled Logical Address Switch see Figure 2 1 for the switch location The down position of the DIP switch corresponds to a logic value of 0 and the up position corresponds to a logic value of Verify that the VXI AO 48XDC does not have the same logical address as any other statically configured VXIbus module in your system Note Logical address 0 is not allowed for the VXI AO 48XDC National Instruments Corporation 2 3 VXI A0 48XDC User Manual Chapter 2 Configuration and Installation Figure 2 2 shows switch settings for logical addresses hex 5 and CO Logical Address Switch Push up for logic 1 T Push down for logic 0 12345678 LSB MSB P1 Connector U51 VXI AO 48XDC Module a Switch Set to Logical Address Hex 5 Default Logical Address Switch Push up for logic 1 Push down for logic 0 12345678 LSB MSB P1 Connector U51 VXI AO 48XDC Module b
57. ve averaging circuit to average the outputs This will reduce the sensitivity of the calibration process to interchannel mismatch When you are done save the calibration channel values to nonvolatile RAM Current Output Calibration There are two adjustments to make for the current outputs offset and gain You should perform offset adjustment first It is a good idea to calibrate twice because a large change in the current gain channel value could impact the accuracy of the offset calibration Offset Adjustment To calibrate the offset set one of the current output channels to 100 uA and measure it with a precise ammeter Then change the current offset channel value until the output is as close as possible to 100 uA The current you write to the current offset channel will be close to 10 uA and increasing it will lower the current you measure Gain Adjustment To calibrate the gain set the current output channel to a current near full scale such as 20 mA Then change the current gain channel value until the output that you measure is as close as possible to the current that you wrote to the output channel The current you write to the current gain channel will be close to 19 608 mA and increasing it will lower the current you measure You can also calibrate using several output channels instead of just one by adding channels together Do this by writing the values to all the channels you wish to add and summing the outputs by c
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