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National Instruments PCI-1200 Port C Pin Connections, Power Connections, DAQ and General Purpose Timing Signal Connections

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Chapter 3 Signal Connections

PCI-1200 User Manual 3-18 © National Instruments Corporation

Figure3-8. Digital output applications include sending TTL signals and

driving external devices such as the LED shown in Figure3-8.

Port C Pin Connections

The signals assigned to portC depend on the mode in which the 82C55A is

programmed. In mode0, port C is considered to be two 4-bit I/O ports. In

modes1 and 2, port C is used for status and handshaking signals with two

or three I/O bits mixed in. Table3-5 summarizes the signal assignments of

portC for each programmable mode. Refer to the PCI-1200 Register-Level

Programmer Manual for register-level programming information.

Power Connections

Pin 49 of the I/O connector supplies +5V from the computer’s power

supply via a self-resetting fuse. The fuse will reset automatically within a

few seconds after the overcurrent condition is removed. Pin 49 is

referenced to DGND and you can use the +5V to power external digital

circuitry.

•Power rating 1A at +4 .65 to +5.25V

Warning Do not directly connect this +5 V power pin to analog or digital ground or to any

other voltage source on the PCI-1200 or any other device. Doing so can damage

the PCI-1200 or your computer. National Instruments is NOT liable for any damage

due to incorrect power connections.

DAQ and General Purpose Timing Signal Connections

Pins38 through 48 of the I/O connector are connections for timing I/O

signals. The PCI-1200 timing I/O uses two 82C53 counter/timer integrated

circuits. One circuit, designated 82C53(A), is used exclusively for DAQ

Table 3-5. Port C Signal Assignments

Programmable

Mode

Group A Group B

PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0

Mode 0 I/O I/O I/O I/O I/O I/O I/O I/O

Mode 1 Input I/O I/O IBFASTBA*INTRASTBB*IBFBBINTRB

Mode 1 Output OBFA*ACKA*I/O I/O INTRAACKB*OBFB*INTRB

Mode 2 OBFA*ACKA*IBFASTBA*INTRAI/O I/O I/O

* Indicates that the signal is active low.

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS Contents Chapter 4 Theory of Operation Page Tables About This Manual Organization of This Manual Conventions Used in This Manual National Instruments Documentation Related Documentation Customer Communication Introduction About the PCI-1200 What You Need to Get Started Unpacking Software Programming Choices National Instruments Application Software NI-DAQ Driver Software Register-Level Programming Optional Equipment Custom Cabling Page Installation and Configuration Software Installation Hardware Installation Board Configuration Analog I/O Configuration Analog Output Polarity Analog Input Polarity Analog Input Mode RSE Input (Eight Channels, Reset Condition) NRSE Input (Eight Channels) DIFF Input (Four Channels) Signal Connections I/O Connector Figure 3-1. PCI-1200 I/O Connector Pin Assignments Signal Connection Descriptions Page Page Analog Input Signal Connections Page Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Input Configurations Chapter 3 Signal Connections Table 3-4. Summary of Analog Input Connections Differential Connection Considerations (DIFF Configuration) Differential Connections for Grounded Signal Sources Figure 3-3. Differential Input Connections for G rounded Signal Sources Differential Connections for Floating Signal Sources Figure 3-4. Differential Input Connections for Floating Sources Single-Ended Connection Considerations Single-Ended Connections for Floating Signal Sources (RSE Configuration) Single-Ended Connections for Grounded Signal Sources (NRSE Configuration) Common-Mode Signal Rejection Considerations Analog Output Signal Connections Digital I/O Signal Connections Logical Inputs and Outputs Port C Pin Connections Power Connections DAQ and General Purpose Timing Signal Connections DAQ Timing Connections Page Page Page General Purpose Timing Signal Connections Page Page Chapter 3 Signal Connections PCI-1200 User Manual 3-26 National Instruments Corporation Figure 3-16. General Purpose Timing Signals The GATE and OUT signals in Figure3-16 are referenced to the rising edge of the CLK signal. Timing Specifications Mode 1 Input Timing Mode 1 Output Timing Mode 2 Bidirectional Timing National Instruments Corporation 4-1 PCI-1200 User Manual Theory of Operation This chapter explains the operation of each functional unit of the PCI-1200. Functional Overview The block diagram in Figure4-1 shows a functional overview of the PCI-1200 board. Figure 4-1. PCI-1200 Block Diagram PCI Interface Circuitry Timing Chapter 4 Theory of Operation PCI-1200 User Manual 4-4 National Instruments Corporation Figure 4-3. Timing Circuitry Chapter 4 Theory of Operation National Instruments Corporation 4-5 PCI-1200 User Manual Analog Input Figure 4-4. Analog Input Circuitry Analog Input Circuitry DAQ Operations Controlled Acquisition Mode Freerun Acquisition Mode Interval Scanning Acquisition Mode Single-Channel Data Acquisition Multichannel Scanned Data Acquisition DAQ Rates Analog Output Analog Output Circuitry DAC Timing Digital I/O Page Calibration Calibration at Higher Gains Calibration Equipment Requirements Using the Calibration Function A Specifications Analog Input Input Characteristics Transfer Characteristics Amplifier Characteristics Dynamic Characteristics Stability Explanation of Analog Input Specifications Explanation of Dither Explanation of DAQ Rates Analog Output Output Characteristics Transfer Characteristics Voltage Output Dynamic Characteristics Stability Explanation of Analog Output Specifications Digital I/O Timing I/O Page B Customer Communication Electronic Services Bulletin Board Support FTP Support Fax-on-Demand Support Telephone and Fax Support Country Telephone Fax Technical Support Form Page PCI-1200 Hardware and Software Configuration Form National Instruments Products Other Products Page Documentation Comment Form Title: Edition Date: Part Number: Mail to: Technical Publications Fax to: Technical Publications Glossary Numbers/Symbols A C D E Page L M N O P R S T V W Index A B C D E F G I L M N O R S T U V W