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National Instruments VXI-AO-48XDC User Manual

National Instruments VXI-AO-48XDC User Manual

Daq, dc setpoint module for vxibus
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VXI-AO-48XDC User Manual
DC Setpoint Module for VXIbus
VXI-AO-48XDC User Manual
March 1999 Edition
Part Number 321403B-01

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  • Page 1 VXI-AO-48XDC User Manual DC Setpoint Module for VXIbus VXI-AO-48XDC User Manual March 1999 Edition Part Number 321403B-01...
  • Page 2 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 techpubs@natinst.com. © Copyright 1997, 1999 National Instruments Corporation. All rights reserved.
  • Page 3 Important Information Warranty 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 documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period.

  • Page 4: Table Of Contents

    Conventions Used in This Manual.................ix Chapter 1 Introduction About the VXI-AO-48XDC...................1-1 What You Need to Get Started ..................1-1 Software Programming Choices ..................1-2 National Instruments Application Software ............1-2 NI-DAQ Driver Software ................1-3 VXIplug&play Instrument Driver ..............1-3 Optional Equipment .......................1-4 Custom Cabling ....................1-4 Unpacking ........................1-5...
  • Page 5 Gain Adjustment ..................... 5-2 Current Output Calibration.................... 5-3 Offset Adjustment ................... 5-3 Gain Adjustment ..................... 5-3 Calibration Programming Considerations ..............5-4 Appendix A Specifications Appendix B Common Questions Appendix C Technical Support Resources Glossary Index VXI-AO-48XDC User Manual © National Instruments Corporation...
  • Page 6 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..........2-2 Figure 2-2. Logical Address Selection...............2-4 Figure 3-1. CH <0..23> Connector Pin Assignments ..........3-2 Figure 3-2. CH <24..47> Connector Pin Assignments ..........3-3 Figure 3-3.

  • Page 7: About This Manual

    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.

  • Page 8: Conventions Used In This Manual

    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-AO-48XDC User Manual © National Instruments Corporation...

  • Page 9: Introduction

    48 voltage output channels and 48 current 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.

  • Page 10: Software Programming Choices

    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&play instrument driver. Both NI-DAQ and the VXIplug&play instrument driver access the VXI-DAQ hardware through the VISA driver software.

  • Page 11: Ni-Daq Driver Software

    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 because it lets multiple devices operate at their peak performance.

  • Page 12: Optional Equipment

    You can interface the VXI-AO-48XDC to a wide range of test instruments, I/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 VXI-AO-48XDC User Manual ©...

  • Page 13: Unpacking

    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: •...

  • Page 14: Configuration And Installation

    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.

  • Page 15: Figure 2-1. Vxi-Ao-48Xdc Parts Locator Diagram

    Configuration and Installation 1 Serial Number 3 Logical Address Switch 5 Product Name 7 Status Light 2 S1 4 P1 Connector 6 Assembly Number 8 Access Light Figure 2-1. VXI-AO-48XDC Parts Locator Diagram VXI-AO-48XDC User Manual © National Instruments Corporation...

  • Page 16: Vxibus Logical Address

    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.

  • Page 17: Hardware Installation

    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. 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.

  • Page 18: Software Installation

    Using evenly distributed pressure, slowly press the VXI-AO-48XDC straight in until it seats in the expansion slot. Make sure the front panel of the VXI-AO-48XDC is even with the front panel of the mainframe. Tighten the retaining screws on the top and bottom edges of the front panel.

  • Page 19: Signal Connections

    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 Instruments is not liable for any damages resulting from any incorrect signal connections.

  • Page 20: Figure 3-1. Ch <0..23> Connector Pin Assignments

    AGND PORT0_LINE1 PORT0_LINE0 DGND PORT0_LINE3 PORT0_LINE2 DGND PORT0_LINE5 PORT0_LINE4 DGND PORT0_LINE7 PORT0_LINE6 DGND PORT1_LINE1 PORT1_LINE0 DGND PORT1_LINE3 PORT1_LINE2 DGND PORT1_LINE5 PORT1_LINE4 DGND PORT1_LINE7 PORT1_LINE6 +5 V Figure 3-1. CH <0..23> Connector Pin Assignments VXI-AO-48XDC User Manual © National Instruments Corporation...

  • Page 21: Figure 3-2. Ch <24..47> Connector Pin Assignments

    AGND PORT2_LINE1 PORT2_LINE0 DGND PORT2_LINE3 PORT2_LINE2 DGND PORT2_LINE5 PORT2_LINE4 DGND PORT2_LINE7 PORT2_LINE6 DGND PORT3_LINE1 PORT3_LINE0 DGND PORT3_LINE3 PORT3_LINE2 DGND PORT3_LINE5 PORT3_LINE4 DGND PORT3_LINE7 PORT3_LINE6 +5 V Figure 3-2. CH <24..47> Connector Pin Assignments © National Instruments Corporation VXI-AO-48XDC User Manual...

  • Page 22: Signal Connection Descriptions

    +5 VDC supply through a self-resetting circuit breaker. C<32..9> 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<8..2> DGND Digital Ground—These pins are connected to the VXIbus system ground signal.

  • Page 23: Analog Output Signal Connections

    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.

  • Page 24: Voltage Output

    Chapter 3 Signal Connections Voltage Output You can connect a floating load to your VXI-AO-48XDC module at the voltage output channel. Because the VXI-AO-48XDC module is not electrically isolated from high Warning voltages, a load with high common mode voltages can damage the VXI-AO-48XDC module.

  • Page 25: Figure 3-4. Ich Connection As A Current Output

    Chapter 3 Signal Connections Figure 3-4 shows how to connect a current channel (ICH) as a current output. Load 0.1 to 20.2 mA AGND VXI-AO-48XDC Figure 3-4. ICH Connection as a Current Output © National Instruments Corporation VXI-AO-48XDC User Manual...

  • Page 26: Digital I/O Signal Connections

    TTL signals and driving external devices such as the LED shown in Figure 3-5. 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.

  • Page 27: Power Connections

    Under no circumstances should you connect these +5 V power pins directly to Warning 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.

  • Page 28: Hardware Overview

    Hardware Overview This chapter contains a functional overview of the VXI-AO-48XDC and explains the operation of each functional unit making up the module. The block diagram in Figure 4-1 illustrates the key functional components of the VXI-AO-48XDC module. Control/Dtack VXI Address...

  • Page 29: Vxibus Interface Circuitry

    Digital I/O Control 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.

  • Page 30: Serial Number Eprom

    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 VXI-AO-48XDC User Manual...

  • Page 31: Calibration

    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.

  • Page 32: Voltage Output Calibration

    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.

  • Page 33: Current Output Calibration

    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 VXI-AO-48XDC User Manual...

  • Page 34: Calibration Programming Considerations

    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. VXI-AO-48XDC User Manual © National Instruments Corporation...
  • Page 35 Specifications This appendix lists the VXI-AO-48XDC specifications. These specifications are valid for an ambient temperature of 0 to 55 °C, unless otherwise stated. Analog Output Number of voltage channels ....48 Number of current channels ....48 Resolution ..........18-bit Type of DAC..........

  • Page 36: Appendix A Specifications

    12 ms max 24 ms max 100 ms max Stability Offset temperature coefficient voltage ..........5 µV/°C current..........10 nA/°C Gain temperature coefficient voltage ..........1 ppm/°C current..........2 ppm/°C Digital I/O Number of channels........32 I/O Compatibility ..........TTL VXI-AO-48XDC User Manual © National Instruments Corporation...
  • Page 37 I/O connector. They assume that all voltage and current outputs are fully loaded. Physical Dimensions..........VXI C-size single slot I/O connector.......... 96-pin (DIN x 2) © National Instruments Corporation VXI-AO-48XDC User Manual...
  • Page 38 Appendix A Specifications Environment Operating Temperature..........0 to 55 °C ambient Relative humidity ........5% to 90% noncondensing Storage Temperature..........–20 to 70 °C ambient Relative humidity ........5% to 90% noncondensing VXI-AO-48XDC User Manual © National Instruments Corporation...
  • Page 39 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.
  • Page 40 How fast does the VXI-AO-48XDC module scan 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.
  • Page 41 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.
  • Page 42 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...
  • Page 43 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 VXI-AO-48XDC User Manual...
  • Page 44 Typically, a bus is the expansion vehicle to which I/O or other devices are connected. byte 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. VXI-AO-48XDC User Manual © National Instruments Corporation...
  • Page 45 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 VXI-AO-48XDC User Manual...
  • Page 46 Memory that can be sequentially, but not simultaneously, accessed by more than one controller or processor. Also known as shared memory. dual-ported memory Memory that can be simultaneously accessed by more than one controller or processor. VXI-AO-48XDC User Manual © National Instruments Corporation...
  • Page 47 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 © National Instruments Corporation VXI-AO-48XDC User Manual...
  • Page 48 Most boards have programmable gains. instrument driver A set of high-level software functions that controls a specific VXI or RS-232 programmable instrument or a specific plug-in DAQ board. VXI-AO-48XDC User Manual © National Instruments Corporation...
  • Page 49 It also provides cooling airflow, and ensures that modules do not disengage from the backplane due to vibration or shock. © National Instruments Corporation VXI-AO-48XDC User Manual...
  • Page 50 A memory storage device that has configuration registers. MITE 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. module Typically a board assembly and its associated mechanical parts, front panel, optional shields, and so on.
  • Page 51 4,096 resolution, and 0.0244 percent of full scale. Resource Manager 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 © National Instruments Corporation VXI-AO-48XDC User Manual...
  • Page 52 Resource Manager. Each device in a system has a unique logical address. system RAM RAM installed on a personal computer and used by the operating system, as contrasted with onboard RAM. VXI-AO-48XDC User Manual G-10 © National Instruments Corporation...
  • Page 53 VISA 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 VXIplug&play Systems Alliance.
  • Page 54 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-AO-48XDC User Manual G-12 © National Instruments Corporation...
  • Page 55 5-1 to 5-4 current output calibration, 5-3 gain adjustment, 5-3 data transceivers, 4-2 offset adjustment, 5-3 DGND signal (table), 3-5 external calibration, 5-1 to 5-2 digital I/O connections channel numbers (table), 5-2 description, 3-8 © National Instruments Corporation VXI-AO-48XDC User Manual...
  • Page 56 Index overview of digital I/O control, 4-3 software installation, 2-6 power-on states of DIO lines, B-2 unpacking VXI-AO-48XDC, 1-5 power-up condition, 3-8 interface, VXIbus circuitry, 4-2 specifications, A-2 to A-3 I/O connector typical digital I/O applications (figure), digital I/O control, 4-3...
  • Page 57 A-3 calibration, 5-4 current output, A-1 to A-2 digital I/O, A-2 to A-3 dynamic characteristics, A-2 environment, A-4 questions about VXI-AO-48XDC physical, A-3 analog output, B-2 power requirements, A-3 general information, B-1 stability, A-2 installation and configuration, B-1 to B-2...
  • Page 58 1-2 to 1-3 NI-DAQ driver software, 1-3 to 1-4 VXIplug&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&play instrument driver, 1-4 VXI-AO-48XDC User Manual © National Instruments Corporation...

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