National Instruments DIO 6533 - page 58

Chapter 4 Signal Connections

© National Instruments Corporation 4-15 DIO 6533 User Manual

Take the following precautions to ensure a uniform transmission line

and minimize noise pickup:

• Use twisted-pair wires to connect digital I/O signals to the device.

Twist each digital I/O signal with a GND line.

• Place a shield around the wires connecting digital I/O signals to the

device.

• Route signals to the device carefully. Keep cabling away from

noise sources. The most common noise source in a PC-based

system is the video monitor. As much as possible, separate the

monitor from any unshielded signal wiring.

For 6533 device output signals, it is important to terminate your cable

properly to reduce or eliminate signal reflections in the cable. You can

use many different methods for terminating transmission lines.

A good method for the 6533 device is to connect one fast Schottky

diode from +5V to each signal line, and another from the signal line to

ground. The +5V and ground connections should be low-impedance

connections. For example, if you make your +5V connection through a

long wire, back to the +5V pin of the 6533 device, add a capacitor to

your termination circuit to stabilize the +5V connection near the

Schottky diodes.

One suitable Shottky diode is the 1N5711, available from several

manufacturers. For more specialized use, you may be able to find diodes

packaged in higher densities appropriate to your application. For

example, the Central Semiconductor CMPSH-35 contains two diodes,

suitable for terminating one line. The California Micro Devices

PDN001 contains 32 diodes, suitable for terminating 16 lines.

You do not need to terminate the 6533 device input signals. The 6533

device contains onboard Schottky diode termination. Figure4-4 shows

the recommended transmission line terminations.

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS About This Manual Chapter 1 Introduction Chapter 2 Installation and Configuration Chapter 3 Hardware Overview Chapter 4 Signal Connections Chapter 5 Signal Timing Page Table About This Manual Organization of This Manual Conventions Used in This Manual National Instruments Documentation Related Documentation Customer Communication Introduction About the DIO 6533 Devices Using PXI with CompactPCI What You Need to Get Started Software Programming Choices National Instruments Application Software NI-DAQ Driver Software Register-Level Programming Optional Equipment Unpacking Installation and Configuration Software Installation Hardware Installation Installing the PCI-DIO-32HS Installing the PXI-6533 Installing the AT-DIO-32HS Installing the DAQCard-6533 PCI, PXI, and DAQCard Device Configuration AT Device Configuration Bus Interface Plug and Play Mode Switchless Data Acquisition Base I/O Address Selection DMA Channel Selection Interrupt Channel Selection National Instruments Corporation 2-7 DIO 6533 User Manual Table 2-1. PC AT I/O Address Map (Continued) Table 2-2 shows the PC AT interrupt assignments. DIO 6533 User Manual 2-8 National Instruments Corporation Table 2-2. PC AT Interrupt Assignment Map Table 2-1. PC AT I/O Address Map (Continued) National Instruments Corporation 2-9 DIO 6533 User Manual Table 2-3 shows the PC AT 16-bit DMA channel assignments. Note: EISA computers also have channels<0..3> available as 16-bit DMA channels. Table 2-3. PC AT 16-Bit DMA Channel Assignment Map Table 2-2. PC AT Interrupt Assignment Map (Continued) Hardware Overview Figure 3-1. PCI-DIO-32HS/PXI-6533 Block Diagram DIO 6533 User Manual 3-2 National Instruments Corporation Figure 3-2. AT-DIO-32HS Block Diagram National Instruments Corporation 3-3 DIO 6533 User Manual Unstrobed I/O Strobed I/OPattern Generation and Handshaking Pattern and Change Detection Pattern-Detection Triggers Change Detection Message Generation Handshaking Protocols 8255 Emulation Level ACK Leading-Edge Pulse Long Pulse Trailing-Edge Pulse Burst Mode Comparing Protocols Table 3-1. National Instruments Corporation 3-11 DIO 6533 User Manual 6533 Handshaking Protocols Starting a Handshaking Transfer Controlling the Startup Sequence Controlling Line Polarities Transfer Rates Page Signal Connections I/O Connector ! Chapter 4 Signal Connections DIO 6533 User Manual 4-2 National Instruments Corporation Figure 4-1. 6533 Device I/O Connector Pin Assignments Signal Descriptions Page Page Signal Characteristics Control Signal Summary RTSI Bus Interface Board and RTSI Clocks RTSI Triggers Data Signal Connections Unstrobed I/O Chapter 4 Signal Connections Figure 4-3. Example of Data Signal Connections National Instruments Corporation 4-11 DIO 6533 User Manual Strobed I/O Timing Connections Pull-Up and Pull-Down Connections Power Connections ! Field Wiring and Termination Page Page Signal Timing Pattern-Generation Timing Request Timing Internal Requests External Requests t t t t t Trigger Timing t t t t t t Handshake Timing 8255 Emulation Input Output Page 8255 Emulation Mode Timing Specifications t t t t t t t Other Asynchronous Modes Level-ACK Mode Page National Instruments Corporation 5-11 DIO 6533 User Manual Figure5-9 shows an output transfer in level-ACK mode. Figure 5-9. Level-ACK Mode Output Figures5-10 and5-11 show the timing diagrams for level-ACK mode. Level-ACK Mode Timing Specifications Page t t Leading-Edge Mode National Instruments Corporation 5-15 DIO 6533 User Manual Figure 5-12 shows an input transfer in leading-edge mode. Figure 5-12. Leading-Edge Mode Input DIO 6533 User Manual 5-16 National Instruments Corporation Figure5-13 shows an output transfer in leading-edge mode. Figure 5-13. Leading-Edge Mode Output Leading-Edge Mode Timing Specifications Figures5-14 and5-15 show the timing diagrams for leading-edge mode. Page t Long-Pulse Mode DIO 6533 User Manual 5-20 National Instruments Corporation Figure 5-17. Long-Pulse Mode Output Long-Pulse Mode Timing Specifications Figures5-18 and5-19 show the timing diagrams for long-pulse mode. Page t Trailing-Edge Mode DIO 6533 User Manual 5-24 National Instruments Corporation Figure 5-20 shows an input transfer in trailing-edge mode. Figure 5-20. Trailing-Edge Mode Input National Instruments Corporation 5-25 DIO 6533 User Manual Figure5-21 shows a write transfer in trailing edge mode. Figure 5-21. Trailing-Edge Mode Output Trailing-Edge Mode Timing Specifications Figures5-22 and5-23 show the timing diagrams for trailing-edge mode. t Burst Mode t t Burst Mode Timing Specifications Page t t t t t t t t t t t t A Specifications PCI-DIO-32HS, PXI-6533, AT-DIO-32HS, and DAQCard-6533 Devices Digital I/O Page Strobed I/O Pattern Generation Page Page Handshaking Pattern and Change Detection Triggers Start and Stop Triggers RTSI Triggers (PCI, PXI, AT) Bus Interfaces Power Requirement Physical Environment B Optional Adapter Description Appendix B Optional Adapter Description Figure B-1. 68-to-50-Pin Adapter Pin Assignments DIO 6533 User Manual B-2 National Instruments Corporation C Customer Communication FTP Support Electronic Services Bulletin Board Support Telephone and Fax Support Telephone Fax Fax-on-Demand Support E-Mail Support (currently U.S. only ) Technical Support Form DIO 6533 Hardware and Software Configuration Form National Instruments Products Other Products Documentation Comment Form Title: Edition Date: Part Number: Mail to: Technical Publications Fax to: Technical Publications Glossary Symbols A B C D E F G H I K L M N O P R S T U V W Page Index Numbers A B C D E F G H I L M N P R S T U