About This ManualPC-DIO-24 User Manual xii © National Instruments Corporation• The Index alphabetically lists the topics in this manual, including the page where you canfind each one.Conventions Used in This ManualThe following conventions are used in this manual.bold Bold text denotes 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 keyconcept.monospace Lowercase text in this font denotes text or characters that are to be literallyinput from the keyboard, sections of code, programming examples, andsyntax examples. This font is also used for the proper names of diskdrives, paths, directories, programs, subprograms, subroutines, devicenames, functions, variables, filenames, and extensions, and for statementsand comments taken from program code.NI-DAQ NI-DAQ refers to the NI-DAQ software for PC compatibles unlessotherwise noted.PC PC refers to the IBM PC/XT, the IBM PC AT, and compatible computersunless otherwise noted.SCXI SCXI stands for Signal Conditioning eXtensions for Instrumentation andis a National Instruments product line designed to perform front-end signalconditioning for National Instruments plug-in DAQ boards.< > Angle brackets containing numbers separated by an ellipses represent arange, signal, or port (for example, ACH<0..7> stands for ACH0 throughACH7).Abbreviations, acronyms, metric prefixes, mnemonics, and symbols are listed in the Glossary.National Instruments DocumentationThe PC-DIO-24 User Manual is one piece of the documentation set for your data acquisition(DAQ) system. You could have any of several types of manuals, depending on the hardware andsoftware in your system. Use the different types of manuals you have as follows:• Getting Started with SCXI—If you are using SCXI, this is the first manual you should read.It gives an overview of the SCXI system and contains the most commonly neededinformation for the modules, chassis, and software.