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PC-DIO-24/PnP User Manual 24-bit Digital I/O Board for ISA Computers February 1998 Edition Part Number 320288C-01 © Copyright 1989, 1998 National Instruments Corporation. All rights reserved. Click here to comment on this document via the National Instruments website at www.
Internet Support E-mail: support@natinst .com FTP Site: ftp.natinst.com Web Address: http://www.natinst .com Bulletin Board Support BBS United States: 512 794 5422 BBS United Kingdom: 01635 551422 BBS.
Important Information Warranty The PC-DIO-24 and PC-DIO-24PnP boards a re 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.
FCC/DOC Radio Frequency Interference Class A Compliance This equipment generates and uses radio frequency en ergy and, if not installed and used in strict accordance with the instructions in this manual, may cause interference to radio a nd television reception.
© National Instruments Corporation v PC-DIO-24/PnP User Manual Contents About This Manual Organization of This Manual .............. .............. ........... .............. .............. .............. ....... ix Conventions Used in This Manual...
Contents PC-DIO-24/PnP User Manual vi © National Instruments Corporation Digital I/O Power-up State Selection ...................... ................ ................. ............... ..... 3-7 High DIO Power-up State ...................... .........
Contents © National Instruments Corporation vii PC-DIO-24/PnP User Manual Mode 1—Strobed Input .......... ............ .............. .............. .............. .............. .... C-11 Mode 1 Input Programming Example ...................... ...
Contents PC-DIO-24/PnP User Manual viii © National Instruments Corporation Figure 3-7. Mode 2 Timing Specification for Bidirectional Transfers .................... 3-14 Figure 4-1. PC-DIO-24/PnP Block Diagram ...................... ................. .
© National Instruments Corporation ix PC -D I O -2 4 /P n P Us e r Ma n ua l About This Manual This manual describes the mechanical and electrical aspects of the PC-DIO-24/PnP and contains information concerning its operation and programming.
About This Manual PC-DIO-24/PnP User Manual x © National Instruments Corporation • Appendix C, Register-Le vel Programming , describes in detail the address and function of each of the PC-DIO-24/PnP control and status registers.
About This Manual © National Instruments Corporation xi PC - DI O -2 4 /P n P Us e r Ma n ua l monospace Text in this fo nt denotes text or characters that yo u should enter literally from the keyboard, sections of code, programming examples, and syntax examples.
About This Manual PC-DIO-24/PnP User Manual xi i © National Instruments Corporation National Instruments Documentation The PC-DIO-24/PnP User Manual is one piece of the documentation set for your data acquisit ion (DAQ) system. You could h ave any of several types of manuals, d epending on the hardware an d software in your system.
About This Manual © National Instruments Corporation xiii PC -D I O -2 4 /P n P U se r M a n ua l Related Documentation The following documents contain information that you may find hel pful as you r.
© National Instrume nts Corporation 1-1 PC -D I O -2 4 /P n P U s e r M an u a l Chapter 1 Introduction This chapter describes the PC-DIO-24/PnP, lists what you need to get started, describes software programmi ng choices, optional equipment, and custom cables, and expl ains how to unpack th e PC-DIO-24/PnP.
Chapter 1 Intr oduction PC-DIO-24/PnP User Manual 1- 2 © National Instruments Corporation What You Need to Get Started To set up and use your PC-DI O-24/PnP, you will ne ed the following: ❑ PC-DIO-.
Chapter 1 Introduction © National Instrume nts Corporation 1-3 PC -D I O -2 4 /P n P U s e r M an u a l LabWindows/CVI features interactive graphic s and a state-of-the-art user interface and u ses the ANSI standard C prog ramming language.
Chapter 1 Intr oduction PC-DIO-24/PnP User Manual 1- 4 © National Instruments Corporation Figure 1-1. The Relationship between the Programming En vironment, NI-DAQ, and Your Hardware Register-Level Programming The final option for programming any National Instruments DAQ hardware is to write register-level software.
Chapter 1 Introduction © National Instrume nts Corporation 1-5 PC -D I O -2 4 /P n P U s e r M an u a l Optional Equipment National Instruments off ers a variety of products to use with your PC-DIO-2.
Chapter 1 Intr oduction PC-DIO-24/PnP User Manual 1- 6 © National Instruments Corporation The mating connector for the PC-DIO-24/PnP is a 50-position, polarized, ribbon socket connector with strain relief. National Instruments uses a polarized (keyed) connector to prevent inadvertent upside-down connection to the PC-DIO-24/PnP.
Chapter 1 Introduction © National Instrume nts Corporation 1-7 PC -D I O -2 4 /P n P U s e r M an u a l Unpacking Your PC-DIO-24/PnP board is shipped in an antistatic package to prevent electrostatic damage to the board. Electrostatic discharge can damage several components on the board.
© National Instrume nts Corporation 2-1 PC -D I O -2 4 /P n P U s e r M an u a l Chapter 2 Installation and Configuration This chapter describes how to install and configure the PC-DIO-24/PnP. Installation Note: Install your driver software before installing your hardware.
Chapter 2 Installation and Configuration PC-DIO-24/PnP User Manual 2- 2 © National Instruments Corporation 1. Turn off and unplug you r computer. 2. Remove the I/O channel top cover or access port. 3. Remove the expansion slot cover on the computer back panel.
Chapter 2 Installation and Configuration © National Instrume nts Corporation 2-3 PC -D I O -2 4 /P n P U s e r M an u a l Base I/O Address and Interrupt Selection To change base I/O address or interrupt selection, r efer to the NI-DAQ Configuration Utili ty Help file.
© National Instrume nts Corporation 3-1 PC -D I O -2 4 /P n P U s e r M an u a l Chapter 3 Signal Connections This chapter includes timing specifications and signal connection instructions for the PC-DIO-24/PnP I/O connector.
Chapter 3 Signal Connections PC-DIO-24/PnP User Manual 3- 2 © National Instruments Corporation Figure 3-1. Digital I/O Connector Pin Assignments +5 V PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 PB0 PB1 PB2 PB3 P.
Chapter 3 Signal Connections © National Instrume nts Corporation 3-3 PC -D I O -2 4 /P n P U s e r M an u a l Signal Descriptions Table 3-1 describes the PC-DIO-24/PnP signals. The absolute maximum voltage input rating is –0.5 to +5.5 V with respect to GND.
Chapter 3 Signal Connections PC-DIO-24/PnP User Manual 3- 4 © National Instruments Corporation Caution: During programming, note that each time you configure any port, out put ports A and C are reset to 0, and output port B is undefined. Digital I/O Signal Connections The following specifications and r atings apply to the di gital I/O lines.
Chapter 3 Signal Connections © National Instrume nts Corporation 3-5 PC -D I O -2 4 /P n P U s e r M an u a l Digital output specifications (referenced to GND): Output logic high voltage 3.7 V min 5.0 V max (I ol = –2.5 mA) Output logic high voltage 2.
Chapter 3 Signal Connections PC-DIO-24/PnP User Manual 3- 6 © National Instruments Corporation Figure 3-2. Digital I/O Co nnections In Figure 3-2, port A is configured for digital output, and port B is configured for digital inp ut.
Chapter 3 Signal Connections © National Instrume nts Corporation 3-7 PC -D I O -2 4 /P n P U s e r M an u a l Power Connections Pin 49 of the I/O connec tor is connected to the +5 V supply from the PC power supply. Th is p in is referenced to GND and can be u sed to power external digital circuitry.
Chapter 3 Signal Connections PC-DIO-24/PnP User Manual 3- 8 © National Instruments Corporation Figure 3-3. DIO Channel Configured for High DIO Power-up State with External Load Example: At power up, the board is configured for input and, by default, all DIO lines are high.
Chapter 3 Signal Connections © National Instrume nts Corporation 3-9 PC -D I O -2 4 /P n P U s e r M an u a l Low DIO Power-up State If you select pulled-low mode, each DIO lin e will be pulled to GND (0 V DC) using a 1 00 k Ω resistor. To pull a specific line high, connect a pull-up resistor that will gi ve you a minimum of 2.
Chapter 3 Signal Connections PC-DIO-24/PnP User Manual 3- 10 © National Instruments Corporation Therefore: R L = 5.6 k Ω ; 2.2 V / 39 µ A This resistor value, 5.
Chapter 3 Signal Connections © National Instruments Corporation 3-11 PC -D I O -2 4 /P n P Us e r Ma n ua l INTR Output Interrupt Request—This signal becomes high when the 82C55A is requesting service during a data transfer. The appropriate interrupt enable bits must be set to generate this signal.
Chapter 3 Signal Connections PC-DIO-24/PnP User Manual 3- 12 © National Instruments Corporation Mode 1 Input Timing The following figure illustr ates the timing specifications for an input transfer in mode 1.
Chapter 3 Signal Connections © National Instruments Corporation 3-13 PC -D I O -2 4 /P n P Us e r Ma n ua l Mode 1 Output Timing The following figure illustr ates the timing specifications for an output transfer in mode 1.
Chapter 3 Signal Connections PC-DIO-24/PnP User Manual 3- 14 © National Instruments Corporation Mode 2 Bidirectional Timing The following figure illustr ates the timing specifications for bidirectional transf ers in mode 2.
© National Instrume nts Corporation 4-1 PC -D I O -2 4 /P n P U s e r M an u a l Chapter 4 Theory of Operation This chapter contains a functional overview of the PC-DIO-24/PnP board and explains the operation of each functional unit making up the PC-DIO-24/PnP.
Chapter 4 Theory of Operation PC-DIO-24/PnP User Manual 4- 2 © National Instruments Corporation Bus Transceivers The bus transceivers send and receive data lines and other signals to and from the PC I/O channel. Bus Interface The PC-DIO-24PnP Plug and Play circuitry automatically arbitrates and assigns system resources.
Chapter 4 Theory of Operation © National Instrume nts Corporation 4-3 PC -D I O -2 4 /P n P U s e r M an u a l Digital I/O Connector All digital I/O is transmitted through a standard, 50-pin, male connector. Pin 49 is connected to +5 V through a resettable protection fuse.
© National Instruments Corporation A-1 PC-DIO-24/P nP User Manual Appendix A Specifications This appendix lists the specifications for the PC-DIO-24/PnP board. These specifications are typical at 25° C, unle ss otherwise stated. The operating temperat ure range is 0° to 70° C.
Appendix A Specifications PC-DIO-24/PnP User Manual A-2 © National Instruments Corporation Output Signals Pin 49 (at 4.65 to 5.25 VDC) .............. 1.0 A max Power Requirement +5 VDC (±10%) ................................. 0.45 A typ, 1 A max Physical Dimensions .
Appendix A Specifications © National Instruments Corporation A-3 PC-DIO-24/P nP User Manual Environment Operating temperature ........................ 0° to 70° C Storage temperature ............................–55° to 150° C Relative humidity .
© National Instruments Corporation B-1 PC-DIO-24/P nP User Manual Appendix B OKI 82C55A Data Sheet This appendix contain s the manufacturer data sheet for th e OKI Semiconductor* 82C55A CMOS PPI. This interface is used on the PC-DIO-24/PnP board. * Copyright © OKI Semiconductor 1995.
Appendix B OKI 82C55A Data Sheet PC-DIO-24/PnP User Manual B-2 © National Instruments Corporation.
Appendix B OKI 82C55A Data Sheet © National Instruments Corporation B-3 PC-DIO-24/P nP User Manual.
Appendix B OKI 82C55A Data Sheet PC-DIO-24/PnP User Manual B-4 © National Instruments Corporation.
Appendix B OKI 82C55A Data Sheet © National Instruments Corporation B-5 PC-DIO-24/P nP User Manual.
Appendix B OKI 82C55A Data Sheet PC-DIO-24/PnP User Manual B-6 © National Instruments Corporation.
Appendix B OKI 82C55A Data Sheet © National Instruments Corporation B-7 PC-DIO-24/P nP User Manual.
Appendix B OKI 82C55A Data Sheet PC-DIO-24/PnP User Manual B-8 © National Instruments Corporation.
Appendix B OKI 82C55A Data Sheet © National Instruments Corporation B-9 PC-DIO-24/P nP User Manual.
Appendix B OKI 82C55A Data Sheet PC-DIO-24/PnP User Manual B-10 © National Instruments Corporation.
Appendix B OKI 82C55A Data Sheet © National Instruments Corporation B-11 PC-DIO -24/PnP User Manual.
Appendix B OKI 82C55A Data Sheet PC-DIO-24/PnP User Manual B-12 © National Instruments Corporation.
Appendix B OKI 82C55A Data Sheet © National Instruments Corporation B-13 PC-DIO -24/PnP User Manual.
Appendix B OKI 82C55A Data Sheet PC-DIO-24/PnP User Manual B-14 © National Instruments Corporation.
Appendix B OKI 82C55A Data Sheet © National Instruments Corporation B-15 PC-DIO -24/PnP User Manual.
Appendix B OKI 82C55A Data Sheet PC-DIO-24/PnP User Manual B-16 © National Instruments Corporation.
Appendix B OKI 82C55A Data Sheet © National Instruments Corporation B-17 PC-DIO -24/PnP User Manual.
© National Instrume nts Corporation C-1 PC- D I O- 2 4/ P n P U se r Ma n ua l Register-Level Programming Appendix C This appendix descri bes in detail the address and function of each of t he PC-DIO-24/PnP control and status registers.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -2 © National Instruments Corporation The PC-DIO-24 (non-PnP) does not have interrupt control registers. Instead, it uses one of the port C lines to enable or disable interrupts. See Appendix D, Using Your PC-DIO-24 (Non-PnP) Board for more information.
Appendix C Register-Level Programming © National Instrume nts Corporation C-3 PC- D I O- 2 4/ P n P U se r Ma n ua l Register Map The following table lists the address map for the PC-DIO-24/PnP. Register Description for the 82C55A Figure C-1 shows the two control word formats used to completely program the 82C55A.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -4 © National Instruments Corporation Figure C-1. Control Word Formats for the 82C55A Caution: During programming, note that each time any port is configured, output ports A and C are reset to 0, and output port B is undefined.
Appendix C Register-Level Programming © National Instrume nts Corporation C-5 PC- D I O- 2 4/ P n P U se r Ma n ua l Table C-2 shows the cont rol words for settin g or resetting each bit in port C. Notice that bit 7 of the control word is cleared when programming the set/reset option for the bits of port C .
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -6 © National Instruments Corporation Interrupt Control Register 1 (PnP Board Only) Bit Name Description 2–7 x Reserved bit.
Appendix C Register-Level Programming © National Instrume nts Corporation C-7 PC- D I O- 2 4/ P n P U se r Ma n ua l Interrupt Control Register 2 (PnP Board Only) Bit Name Description 1–0, 3–7 X Reserved Bit. 2 INTEN Global Interrupt En able Bit—If th is bit is set, t he PC-DIO-24PnP can interrup t the host computer.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -8 © National Instruments Corporation Programming Considerations for the 82C55A Modes of Operation for the 82C55A The three basic mod.
Appendix C Register-Level Programming © National Instrume nts Corporation C-9 PC- D I O- 2 4/ P n P U se r Ma n ua l Mode 2 Use this mode for commun ication over a b idirectional 8-bit bus. Handshaking signals are used in a manner similar to mo de 1.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -10 © National Instruments Corporation Mode 0 Programming Example The following exampl e shows how to configure the 82C55A for various combinations of mode 0 input and output.
Appendix C Register-Level Programming © National Instruments Corporation C-11 PC - D IO - 24 / P nP U se r M an u a l outp(portc,0x56); /* Write data to port C. */ /* EXAMPLE 2*/ outp(cnfg,0x90); /* Port A is input; ports B and C are outputs. */ outp(portb,0x22); /* Write data to port B.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -12 © National Instruments Corporation The control word written to the CNFG Register to configure port B for input in mode 1 is shown as follows. Notice that port B does not have extra input or outp ut lines left fr om port C when ports A and B are both enabled for handshakin g.
Appendix C Register-Level Programming © National Instruments Corporation C-13 PC - D IO - 24 / P nP U se r M an u a l 0 INTRB Interrupt Request Status for Port B—When INTEB and IBFB are high, this bit is high, indicating that an interrupt request is pending for port B.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -14 © National Instruments Corporation /* EXAMPLE 1–port A input */ outp(cnfg,0xB0); /* Port A is an input in mo de 1. */ while (!(inp(portc) & 0x20 )); /* Wait until IBFA is set, indicating that data has be en loaded in port A.
Appendix C Register-Level Programming © National Instruments Corporation C-15 PC - D IO - 24 / P nP U se r M an u a l Port C status-word bit defi nitions for outpu t (port A and port B): Bit Name Description 7 OBFA* Output Buffer for Port A—A low setting indicates that the CPU has written data to port A.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -16 © National Instruments Corporation Figure C-3. Port C Pin Assignments, Mode 1 Output Mode 1 Output Programming Example The following example shows how to confi gure PPI A for various combinations of mode 1 output.
Appendix C Register-Level Programming © National Instruments Corporation C-17 PC - D IO - 24 / P nP U se r M an u a l /* EXAMPLE 2–port B output */ outp(cnfg,0x84); /* Port B is an output in m ode 1.*/ while (!(inp(portc) & 0x02 )); /* Wait until OBFB* is set, indicating that the data la st written to port B has been read.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -18 © National Instruments Corporation During a mode 2 data transfer, the stat us of the handshaking lines and interrupt signal s can be obtained by readin g port C. The port C status- word bit definition s for a mode 2 transfer ar e shown as follows.
Appendix C Register-Level Programming © National Instruments Corporation C-19 PC - D IO - 24 / P nP U se r M an u a l At the digital I/O connector, port C has the following pin assignments when in mode 2. Notice that the status of STBA* and the status of ACKA* are not included in the port C status word.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -20 © National Instruments Corporation cnfg = BASE_ADDRESS + CNF Goffset; /* EXAMPLE 1*/ outp(cnfg,0xC0); /* Port A is in mode 2. */ while (!(inp(portc) & 0x80 )); /* Wait until OBFA* is set, indicating that the data la st written to port A has been read.
Appendix C Register-Level Programming © National Instruments Corporation C-21 PC - D IO - 24 / P nP U se r M an u a l Main() { #define BASE_ADDRESS 0x180 /* Board located at address 180 */ #define PO.
Appendix C Register-Level Programming PC-DIO-24/PnP User Manual C -22 © National Instruments Corporation outp(ireg1,0x02); /* Set IRQ1 to enable port B interrupts. */ outp(ireg2,0x04); /* Set INTEN bit. */ /* EXAMPLE 5–Set up interr upts for mode 2 output transfers.
Appendix C Register-Level Programming © National Instruments Corporation C-23 PC - D IO - 24 / P nP U se r M an u a l port B is in mode 0, use PC0 to generate an interrupt. Once you have configured the 82C5 5A, set the corresponding int errupt enable bit in Interrupt Control Register 1.
© National Instruments Corporation D-1 PC-D I O- 2 4/ P nP U se r Ma n ua l Using Your PC-DIO-24 (Non-PnP) Board Appendix D This appendix describes the differences between t he PC-DIO-24 and PC-DIO-24PnP boards, the PC-DIO-24 board configuration, and the PC-DIO-24 installation into your computer.
Appendix D Using Your PC-DIO-24 (Non-PnP) Board PC -D I O- 2 4/ P nP Us e r M an u al D-2 © National Instruments Corporation Configuration The PC-DIO-24 contains one DIP switch and two jumpers to configure the base I/O address, interrupt level, and interrupt enable signal.
Appendix D Using Y our PC-DIO-24 (Non-PnP) Board © National Instruments Corporation D-3 PC-D I O- 2 4/ P nP U se r Ma n ua l Figure D-1. PC-DIO-24 Parts Locator Diagram Base I/O Address Settings The base I/O address for the PC-DIO-24 is determined by the switches at position U9 (see Figure 2-1).
Appendix D Using Your PC-DIO-24 (Non-PnP) Board PC -D I O- 2 4/ P nP Us e r M an u al D-4 © National Instruments Corporation Figure D-2. Example Base I /O Address Switch Set tings Table D-3 shows some examples of switch settings and their corresponding addr ess ranges.
Appendix D Using Y our PC-DIO-24 (Non-PnP) Board © National Instruments Corporation D-5 PC-D I O- 2 4/ P nP U se r Ma n ua l Interrupt Selection There are two sets of jumpers for interrupt select ion on the PC-DIO-24 board. W3 is used for selecting the interrupt enable line .
Appendix D Using Your PC-DIO-24 (Non-PnP) Board PC -D I O- 2 4/ P nP Us e r M an u al D-6 © National Instruments Corporation Interrupt Enable Settings To enable interrupt requests from the PC-DIO-24, you must set jumper W3 to select PC2, PC4, or PC6 as the active low interrupt enable line.
Appendix D Using Y our PC-DIO-24 (Non-PnP) Board © National Instruments Corporation D-7 PC-D I O- 2 4/ P nP U se r Ma n ua l The PC-DIO-24 uses a tristate driver to drive its selected interrupt line. The PC-DIO-24 can therefore share an interrupt line if your system and your other devi ces allow.
© National Instruments Corporation E-1 PC-DIO-24/PnP User Manual Appendix E Customer Communication For your con venience, this appendix contains forms to help you gather the information necessary to help us solve your technical problems and a form you can use to comment on the product documentation.
Fax-on-Demand Support Fax-on-Demand is a 24-hour information retriev al system containing a library of documents on a wide range of technical information.
Technical Support Form Photocopy this form and update it each time you make changes to your software or hardw are, and use the completed copy of this form as a reference for your current configuration.
PC-DIO-24/PnP Hardware and Software Configuration Form Record the settings and revisions of your hardware and software on the line to the right of each item. Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration.
Documentation Comment Form National Instruments encourages you to commen t on the documentation supplied with our products. This information helps us provide quality pro ducts to meet your needs.
© National Instruments Corporation G-1 PC-DIO-24/PnP User Manual Glossary Symbols ° degrees – negative o f, or minus Ω ohms /p e r % percent + positive of, or p lus A Aa m p e r e AC alternating.
Glossar y PC-DIO-24/PnP User Manual G-2 © National Instruments Corporation B b bit—one binary digit, either 0 or 1 B byte—eight relate d bits of data, an eight-bit binary number. Also used to denote the amount of memory requ ired to store one byte of data.
Glossary © National Instruments Corporation G-3 PC-DIO-24/PnP User Manual F ft. feet H h hour handshaked digital I/O a type of digital acquisition/generation where a device or module accepts or transfers data after a digital pulse has been received. Also called latched digital I/O.
Glossar y PC-DIO-24/PnP User Manual G-4 © National Instruments Corporation K kilo—the prefix for 1 ,024, or 2 10 , used with B in quant ifying data or computer memory kbytes 1,024 bytes kbytes/s a .
Glossary © National Instruments Corporation G-5 PC-DIO-24/PnP User Manual PnP PnP (Plug and Play) refers to a device that is fully compatible with the industry standard Plug and Play ISA Specification.
Glossar y PC-DIO-24/PnP User Manual G-6 © National Instruments Corporation V Vv o l t s Vcc Supply volt age; for example, the voltage a comput er supplies to its plug-in devices VDC volts direct curr.
© National Instruments Corporation I-1 PC-DIO-24/PnP User Manual Index Special Characters +5 V signal connection to ground or other voltage source (caution), 3-7 description (table), 3-3 po wer connections, 3-7 self-resetting fuse, 3-7 82C55A Programmable Peripheral Interface capabilities, 1-1 data sheet, B-1 to B-17 modes of operation.
Index PC-DIO-24/PnP User Manual I-2 © National Instruments Corporation mode 1 strobed output (figure), C-13 mode 2 bidirectional bus (f igure), C-17 Port C set/reset control words (table), C-5 custom.
Index © National Instruments Corporation I-3 PC-DIO-24/PnP User Manual interrupt lev el PC-DIO-24 (no n -P nP ) factory settings (table), D-2 jumper setting (figure), D-6 setting, D-6 to D-7 PC-DIO-2.
Index PC-DIO-24/PnP User Manual I-4 © National Instruments Corporation control word written to CNFG Register (f igure), C-17 Port C pin assignments (figure), C-19 Port C status-word bit definitions, .
Index © National Instruments Corporation I-5 PC-DIO-24/PnP User Manual po wer requirements, A-2 programming. See register-le vel programming. R RD* signal description (table), 3-11 mode 1 input timin.
Index PC-DIO-24/PnP User Manual I-6 © National Instruments Corporation software programming choices, 1-2 to 1-4. See also register-le vel programming.
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