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Chapter 3

Signal Connections

National Instruments Corporation

3-11

Figure 3-7. DIO Channel Configured for Low DIO State with External Load

Example:
The switch is set in the low DIO state, which means all DIO lines are pulled
low. If you want to pull one channel high, follow these steps:

Install a load (R

). Remember that the smaller the resistance, the

greater the current consumption and the lower the voltage (V).

Using the following formula, calculate the largest possible load to
maintain a logic high level of 2.8 V and supply the maximum sink
current (I).

V = I * R

⇒

= V / I, where:

V = 2.2 V is the voltage across R

I = 28

A + 10

A is the 2.8 V across the 100 k

Ω

pull-up

resistor and 10

A from 82C55A leakage current

Therefore:

= 5.7 k

Ω

is the 2.2 V / 38

This resistor value, 5.7 k

Ω

, provides a minimum of 2.8 V on the DIO line

at power up. You can substitute smaller resistor values but they draw more
current, leaving less sink current for other circuitry connected to this line.
The 5.7 k

Ω

resistor reduces the amount of a logic low sink current by

0.8 mA with a 0.4 V output.

Floating DIO State

The DIO lines are not pulled high or low by your DAQPad device in this
configuration. Use an external 100 k

Ω

resistor to pull the line to the state

you want.

DAQPad-6507/6508

Digital I/O Line

+5 V

GND

100 k

Ω

82C55A

Содержание DAQPad-6507

Страница 1: ...AQPad 6507 6508 User Manual Digital I O Devices for USB DAQPad 6507 6508 User Manual December 1998 Edition Part Number 321724B 01 Copyright 1997 1998 National Instruments Corporation All rights reserved ...

Страница 2: ...336 Canada Ontario 905 785 0085 Canada Québec 514 694 8521 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico 5 520 2635 Netherlands 0348 433466 Norway 32 84 84 00 Singapore 2265886 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 200 51 51 Taiwan 02 377 1200 Un...

Страница 3: ...TS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in p...

Страница 4: ...Programming Choices 1 2 National Instruments Application Software 1 3 NI DAQ Driver Software 1 4 Optional Equipment 1 5 Custom Cabling 1 6 Unpacking 1 6 Chapter 2 Installation and Configuration Software Installation 2 1 Hardware Installation 2 1 Configuration 2 4 Power Considerations 2 4 Chapter 3 Signal Connections I O Connector Pin Description 3 2 I O Connector Signal Connection Descriptions 3 3...

Страница 5: ...15 Chapter 4 Theory of Operation Interrupt Control Circuitry 4 2 USB Microcontroller 4 2 82C55A Programmable Peripheral Interface 4 2 Digital I O Connector 4 3 Appendix A Specifications Appendix B OKI 82C55A Data Sheet Appendix C Common Questions Appendix D Customer Communication Glossary Index Figures Figure 1 1 The Relationship between the Programming Environment NI DAQ and Your Hardware 1 5 Fig...

Страница 6: ...h 50 of the DAQPad 6508 I O Connector 3 5 Figure 3 4 Cable Assembly Connector Pin Assignments for Pins 51 through 100 of the DAQPad 6508 I O Connector 3 6 Figure 3 5 Digital I O Connections 3 7 Figure 3 6 DIO Channel Configured for High DIO State with External Load 3 9 Figure 3 7 DIO Channel Configured for Low DIO State with External Load 3 11 Figure 4 1 DAQPad 6507 6508 Devices Block Diagram 4 1 ...

Страница 7: ...custom cables and explains how to unpack the DAQPad 6507 and DAQPad 6508 Chapter 2 Installation and Configuration describes how to install and configure the DAQPad 6507 and DAQPad 6508 devices Chapter 3 Signal Connections includes timing specifications and signal connection instructions for the DAQPad 6507 and 6508 I O connectors Chapter 4 Theory of Operation contains a functional overview of the ...

Страница 8: ...C55A OKI Semiconductor CMOS programmable peripheral interface Angle brackets containing numbers separated by an ellipses represent a range of values associated with a bit or signal name for example ACH 0 7 bold italic Bold italic text denotes a note caution or warning italic Italic text denotes emphasis a cross reference or an introduction to a key concept monospace Text in this font denotes text ...

Страница 9: ...on about the DAQ hardware that plugs into or is connected to your computer Use these manuals for hardware installation and configuration instructions specification information about your DAQ hardware and application hints Software documentation Examples of software documentation you may have are the LabVIEW LabWindows CVI and NI DAQ documentation sets After you set up your hardware system use eith...

Страница 10: ...al reference manual USB Specification Revision 1 1 Customer Communication National Instruments wants to receive your comments on our products and manuals We are interested in the applications you develop with our products and we want to help if you have problems with them To make it easy for you to contact us this manual contains comment and configuration forms for you to complete These forms are ...

Страница 11: ...rupt requests to the host computer You can program the 82C55A for almost any 8 bit or 16 bit digital I O application All communication is through a standard 100 pin female connector for the DAQPad 6508 or 100 screw terminals with a strain relief clamp for the DAQPad 6507 Your DAQPad device has a wide input voltage range and can be powered from any 9 to 30 VDC power supply You can use your DAQPad d...

Страница 12: ...uter can serve as a digital I O system controller for laboratory testing production testing and industrial process monitoring and control Detailed specifications of the DAQPad 6507 and DAQPad 6508 devices are in Appendix A Specifications What You Need to Get Started To set up and use your DAQPad 6507 or DAQPad 6508 you will need the following DAQPad 6507 or DAQPad 6508 device DAQPad 6507 6508 User...

Страница 13: ...ndows CVI Data Acquisition Library a series of functions for using LabWindows CVI with National Instruments DAQ hardware is included with the NI DAQ software kit The LabWindows CVI Data Acquisition Library is functionally equivalent to the NI DAQ software ComponentWorks contains tools for data acquisition and instrument control built on NI DAQ driver software ComponentWorks provides a higher level...

Страница 14: ...Q I O functions for maximum ease of use and low level DAQ I O functions for maximum flexibility and performance Examples of high level functions are streaming data to disk or acquiring a certain number of data points 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 mul...

Страница 15: ...ew terminals SCXI modules and accessories for isolating amplifying exciting and multiplexing signals from up to 3 072 channels for relays and analog output Low channel count signal conditioning modules devices and accessories including conditioning for strain gauges and RTDs simultaneous sample and hold and relays For more specific information about these products refer to your National Instrument...

Страница 16: ...e with your DAQPad device This accessory includes two 50 conductor flat ribbon cables and a connector block You can attach signal input and output wires to screw terminals on the connector block and therefore connect signals to your DAQPad device I O connector You can use the CB 100 for initial prototyping of an application or in situations in which your DAQPad device interconnections are frequent...

Страница 17: ...latest version of NI DAQ install it from the CD that ships with your device To install NI DAQ refer to your NI DAQ release notes Find the installation section for your operating system and follow the instructions given there Hardware Installation You can connect your DAQPad 6507 or DAQPad 6508 to any available USB socket The following are general installation instructions but consult your computer...

Страница 18: ...7 or DAQPad 6508 Your computer should detect your DAQPad device immediately and when the computer recognizes your DAQPad device the LED on the front panel blinks or lights up depending on the status of your device 3 If the LED comes on after the DAQPad is powered and connected to the host it is functioning properly Refer to Table 2 1 for LED pattern descriptions for your DAQPad device 4 Configure ...

Страница 19: ...tion Off Off or in the low power suspend mode Your DAQPad device is turned off or in the low power suspend mode 2 blinks Addressed state This pattern is displayed if the host computer detects your DAQPad device but cannot configure it because there are no system resources available If your DAQPad remains in this state check your software installation 3 blinks Power supply failure This pattern is d...

Страница 20: ...perating system enables the instrument for operation Refer to your software documentation for more information Power Considerations The DAQPad device remains powered up only when the USB cable connects it to the host computer and the computer is powered up The host computer has the ability to go into a power saving suspend mode During this time your DAQPad device can also go into a low power mode ...

Страница 21: ...tput channels will be static at a fixed voltage Note Refer to the Set_DAQ_Device_Info function in the NI DAQ Function Reference Manual to change the settings that determine the behavior of your DAQPad device during the suspend state If low power consumption is a concern the recommended way to turn off your DAQPad device is with the rocker switch located on the rear panel This switch turns your DAQ...

Страница 22: ...cription of each signal in this section includes information about maximum input ratings National Instruments is not liable for any damages resulting from any inaccurate signal connections To learn more about screw terminal assignments on the DAQPad 6507 refer to Figure 3 1 Figure 3 1 Screw Terminal Assignments for the DAQPad 6507 APA 0 1 2 3 4 5 6 7 BPA 0 1 2 3 4 5 6 7 APB 0 1 2 3 4 5 6 7 BPB 0 1...

Страница 23: ...75 24 74 23 73 22 72 21 71 20 70 19 69 18 68 17 67 16 66 15 65 14 64 13 63 12 62 11 61 10 60 9 59 8 58 7 57 6 56 5 55 4 54 3 53 2 52 1 51 GND GND 5 V 5 V BPA0 DPA0 APA0 CPA0 BPA1 DPA1 APA1 CPA1 BPA2 DPA2 APA2 CPA2 BPA3 DPA3 APA3 CPA3 BPA4 DPA4 APA4 CPA4 BPA5 DPA5 APA5 CPA5 BPA6 DPA6 APA6 CPA6 BPA7 DPA7 APA7 CPA7 BPB0 DPB0 APB0 CPB0 BPB1 DPB1 APB1 CPB1 BPB2 DPB2 APB2 CPB2 BPB3 DPB3 APB3 CPB3 BPB4 D...

Страница 24: ...0 the LSB 34 36 38 40 42 44 46 48 BPA 7 0 Bidirectional Data Lines for Port A of PPI B BPA7 is the MSB BPA0 the LSB 51 53 55 57 59 61 63 65 CPC 7 0 Bidirectional Data Lines for Port C of PPI C CPC7 is the MSB CPC0 the LSB 67 69 71 73 75 77 79 81 CPB 7 0 Bidirectional Data Lines for Port B of PPI C CPB7 is the MSB CPB0 the LSB 83 85 87 89 91 93 95 97 CPA 7 0 Bidirectional Data Lines for Port A of P...

Страница 25: ... an assembly of two 50 pin cables and three connectors Both cables are joined to a single connector on one end and to individual connectors on the free ends The 100 pin connector that joins the two cables plugs into the I O connector of the DAQPad 6508 The other two connectors are 50 pin connectors one of which is connected to pins 1 through 50 and the other is connected to pins 51 through 100 of ...

Страница 26: ...nnector 5 V APA0 APA1 APA2 APA3 APA4 APA5 APA6 APA7 APB0 APB1 APB2 APB3 APB4 APB5 APB6 APB7 APC0 APC1 APC2 APC3 APC4 APC5 APC6 APC7 GND BPA1 BPA2 BPA4 BPA5 BPA6 BPA7 BPA0 BPA3 BPB0 BPB1 BPB2 BPB3 BPB4 BPB5 BPB6 BPB7 BPC0 BPC1 BPC2 BPC3 BPC4 BPC5 BPC6 BPC7 49 50 47 48 45 46 43 44 41 42 39 40 37 38 35 36 33 34 31 32 29 30 27 28 25 26 23 24 21 22 19 20 17 18 15 16 13 14 11 12 9 10 7 8 5 6 3 4 1 2 ...

Страница 27: ...onnector 5 V CPA0 CPA1 CPA2 CPA3 CPA4 CPA5 CPA6 CPA7 CPB0 CPB1 CPB2 CPB3 CPB4 CPB5 CPB6 CPB7 CPC0 CPC1 CPC2 CPC3 CPC4 CPC5 CPC6 CPC7 GND DPA1 DPA2 DPA4 DPA5 DPA6 DPA7 DPA0 DPA3 DPB0 DPB1 DPB2 DPB3 DPB4 DPB5 DPB6 DPB7 DPC0 DPC1 DPC2 DPC3 DPC4 DPC5 DPC6 DPC7 49 50 47 48 45 46 43 44 41 42 39 40 37 38 35 36 33 34 31 32 29 30 27 28 25 26 23 24 21 22 19 20 17 18 15 16 13 14 11 12 9 10 7 8 5 6 3 4 1 2 ...

Страница 28: ...ut and PPI C port B is configured for digital input Digital input applications include receiving TTL signals and sensing external device states such as the state of the switch in Figure 3 5 Digital output applications include sending TTL signals and driving external devices such as the LED shown in Figure 3 5 Complex switch circuitry is not shown in order to simplify the figure DAQPad 6507 6508 Sw...

Страница 29: ... any device from using more than 0 5 A If you are running from USB power that is if your external power source is not plugged in you have only 150 mA to drive signals and supply power for your circuitry If you require more power than 150 mA attach the external power source Also your host computer might turn off power to your DAQPad device if no activity is detected This cuts the power to any exter...

Страница 30: ...to TTL logic levels or you can let the lines float and tie them all high or low as necessary High DIO State If you select the pulled high mode each DIO line will be pulled to VCC 5 VDC with a 100 kΩ resistor To pull a specific line low connect between that line and ground and use a pull down resistor RL whose value will give you a maximum of 0 4 VDC The DIO lines provide a maximum of 2 5 mA at 3 7...

Страница 31: ... maximum of 0 4 V on the DIO line at power up You can substitute smaller resistor values but they will draw more current leaving less drive current for other circuitry connected to this line The 7 1 kΩ resistor reduces the amount of a logic high source current by 0 4 mA with a 2 8 V output Low DIO State If you select pulled low mode each DIO line will be pulled to GND 0 VDC using a 100 kΩ resistor...

Страница 32: ...mum sink current I V I RL RL V I where V 2 2 V is the voltage across RL I 28 µA 10 µA is the 2 8 V across the 100 kΩ pull up resistor and 10 µA from 82C55A leakage current Therefore RL 5 7 kΩ is the 2 2 V 38 µA This resistor value 5 7 kΩ provides a minimum of 2 8 V on the DIO line at power up You can substitute smaller resistor values but they draw more current leaving less sink current for other ...

Страница 33: ...ne indicates that the data written to the port has been accepted This signal is a response from the external device indicating that it has received the data from the DAQPad 6507 6508 devices OBF Output Output Buffer Full A low signal on this handshaking line indicates that data has been written to the port INTR Output Interrupt Request This signal becomes high when the 82C55A requests service duri...

Страница 34: ...illustrates the timing specifications for an input transfer in mode 1 Name Description Minimum Maximum T1 STB pulse width 100 T2 STB 0 to IBF 1 150 T3 Data before STB 1 20 T4 STB 1 to INTR 1 150 T5 Data after STB 1 50 T6 RD 0 to INTR 0 200 T7 RD 1 to IBF 0 150 All timing values are in nanoseconds DATA RD INTR IBF STB T1 T2 T4 T7 T6 T3 T5 ...

Страница 35: ...lowing figure illustrates the timing specifications for an output transfer in mode 1 Name Description Minimum Maximum T1 WR 0 to INTR 0 250 T2 WR 1 to output 200 T3 WR 1 to OBF 0 150 T4 ACK 0 to OBF 1 150 T5 ACK pulse width 100 T6 ACK 1 to INTR 1 150 All timing values are in nanoseconds WR OBF INTR ACK DATA T1 T2 T3 T4 T5 T6 ...

Страница 36: ...ctional transfers in mode 2 Name Description Minimum Maximum T1 WR 1 to OBF 0 150 T2 Data before STB 1 20 T3 STB pulse width 100 T4 STB 0 to IBF 1 150 T5 Data after STB 1 50 T6 ACK 0 to OBF 1 150 T7 ACK pulse width 100 T8 ACK 0 to output 150 T9 ACK 1 to output float 20 250 T10 RD 1 to IBF 0 150 All timing values are in nanoseconds T1 T6 T7 T3 T4 T10 T2 T5 T8 T9 WR OBF INTR ACK STB IBF RD DATA ...

Страница 37: ...upply Controls Firmware EEPROM SRAM Serial Configuration EEPROM External Power 5 V Supply Power Supply Controls Power Supply Switch Port A Port B Port C Terminal Blocks 100 POS USB Interface 82C55 PPI A 82C55 PPI B 82C55 PPI C 82C55 PPI D 82C53 Timer 500 mA Port A Port A Port A Port B Port B Port B Port C 6 6 6 6 Control Lines Control Lines Control Lines Control Lines Port C Port C USB Microcontro...

Страница 38: ...crocontroller The USB controller is a special microcontroller that has circuitry necessary to transmit and receive data over USB itself It maintains information about the status of the bus and follows the USB protocol to acquire and send information over the bus The microcontroller receives instruction codes over USB parses the instructions and executes them NI DAQ handles all interaction with the...

Страница 39: ...mp for the DAQPad 6507 Pins 49 and 99 are connected to 5 V through a self restarting protection fuse F1 See Figure 4 1 for its location This 5 V supply is often required to operate I O module mounting racks Pins 50 and 100 are connected to ground See the Optional Equipment section in Chapter 1 Introduction as well as Chapter 2 Installation and Configuration and the Digital I O Signal Connections s...

Страница 40: ...ompatibility TTL Absolute max voltage rating 0 5 to 5 5 V with respect to GND Handshaking Requires 1 port Power on state Configured as inputs high selectable on the front panel switch Data transfers Interrupts programmed I O Digital logic levels Level Min Max Input low voltage Input high voltage Input low current Vin 0 8 V Input high current Vin 2 4 V 0 3 V 2 2 V 0 8 V 5 3 V 1 0 µA 1 0 µA Output l...

Страница 41: ...l power supply connected you have only 150 mA of current available to drive all outputs including DIO lines Transfer rates Up to 60 S s Power Requirement External 9 to 30 VDC 12 W max USB 4 40 to 5 25 VDC 220 mA typ 500 mA max Physical Dimensions 22 9 by 14 6 cm 9 0 by 5 7 in I O connector DAQPad 6507 100 screw terminals DAQPad 6508 100 pin female 0 050 series D type Environment Operating temperat...

Страница 42: ...e manufacturer data sheet for the OKI 82C55A1 OKI Semiconductor CMOS programmable peripheral interface This interface is used on the DAQPad 6507 6508 devices 1 Copyright OKI Semiconductor 1993 Reprinted with permission of copyright owner All rights reserved OKI Semiconductor Data Book Microprocessor Seventh Edition March 1993 ...

Страница 43: ...Appendix B OKI 82C55A Data Sheet DAQPad 6507 6508 User Manual B 2 National Instruments Corporation ...

Страница 44: ...Appendix B OKI 82C55A Data Sheet National Instruments Corporation B 3 DAQPad 6507 6508 User Manual ...

Страница 45: ...Appendix B OKI 82C55A Data Sheet DAQPad 6507 6508 User Manual B 4 National Instruments Corporation ...

Страница 46: ...Appendix B OKI 82C55A Data Sheet National Instruments Corporation B 5 DAQPad 6507 6508 User Manual ...

Страница 47: ...Appendix B OKI 82C55A Data Sheet DAQPad 6507 6508 User Manual B 6 National Instruments Corporation ...

Страница 48: ...Appendix B OKI 82C55A Data Sheet National Instruments Corporation B 7 DAQPad 6507 6508 User Manual ...

Страница 49: ...Appendix B OKI 82C55A Data Sheet DAQPad 6507 6508 User Manual B 8 National Instruments Corporation ...

Страница 50: ...Appendix B OKI 82C55A Data Sheet National Instruments Corporation B 9 DAQPad 6507 6508 User Manual ...

Страница 51: ...Appendix B OKI 82C55A Data Sheet DAQPad 6507 6508 User Manual B 10 National Instruments Corporation ...

Страница 52: ...Appendix B OKI 82C55A Data Sheet National Instruments Corporation B 11 DAQPad 6507 6508 User Manual ...

Страница 53: ...Appendix B OKI 82C55A Data Sheet DAQPad 6507 6508 User Manual B 12 National Instruments Corporation ...

Страница 54: ...Appendix B OKI 82C55A Data Sheet National Instruments Corporation B 13 DAQPad 6507 6508 User Manual ...

Страница 55: ...Appendix B OKI 82C55A Data Sheet DAQPad 6507 6508 User Manual B 14 National Instruments Corporation ...

Страница 56: ...Appendix B OKI 82C55A Data Sheet National Instruments Corporation B 15 DAQPad 6507 6508 User Manual ...

Страница 57: ...Appendix B OKI 82C55A Data Sheet DAQPad 6507 6508 User Manual B 16 National Instruments Corporation ...

Страница 58: ...Appendix B OKI 82C55A Data Sheet National Instruments Corporation B 17 DAQPad 6507 6508 User Manual ...

Страница 59: ...on and Configuration How do I know if my version of Windows supports USB Look in the System properties in the control panel The Device Manager tab should list a Universal Serial Bus Controller along with a USB Controller and a USB root hub If your computer has this and also USB ports your machine is supported If your computer has USB ports but no controller is listed in the Device Manager you migh...

Страница 60: ...ormation Digital I O What are the power on states of the PPI and DIO lines on the I O connector At system power on and reset both the PPI and DIO lines are set to high impedance by the hardware This means that the device circuitry is not actively driving the output either high or low However these lines may have pull up or pull down resistors connected to them as shown in the Digital I O State Sel...

Страница 61: ...ystems does not answer your questions we offer fax and telephone support through our technical support centers which are staffed by applications engineers Electronic Services Bulletin Board Support National Instruments has BBS and FTP sites dedicated for 24 hour support with a collection of files and documents to answer most common customer questions From these sites you can also download the late...

Страница 62: ...ents office in your country contact the source from which you purchased your software to obtain support Country Telephone Fax Australia 03 9879 5166 03 9879 6277 Austria 0662 45 79 90 0 0662 45 79 90 19 Belgium 02 757 00 20 02 757 03 11 Brazil 011 288 3336 011 288 8528 Canada Ontario 905 785 0085 905 785 0086 Canada Québec 514 694 8521 514 694 4399 Denmark 45 76 26 00 45 76 26 02 Finland 09 725 72...

Страница 63: ...____ Instruments used _________________________________________________________________ _______________________________________________________________________________ National Instruments hardware product model _____________ Revision ____________________ Configuration ___________________________________________________________________ National Instruments software product ___________________ Vers...

Страница 64: ...s ____________________________________________________ DMA channels of other boards _____________________________________________________ Interrupt level of other boards ______________________________________________________ Other Products Computer make and model ________________________________________________________ Microprocessor ________________________________________________________________...

Страница 65: ..._____________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ __________________________________________________________________...

Страница 66: ...r Manual Glossary Prefix Meanings Value p pico 10 12 n nano 10 9 µ micro 10 6 m milli 10 3 k kilo 103 M mega 106 G giga 109 Symbols Numbers percent plus or minus degrees per positive of or plus negative of or minus Ω ohms square root of 5 V 5 VDC source signal ...

Страница 67: ... at too low a sampling rate ALU arithmetic logic unit the element s in a processing system that perform s the mathematical functions such as addition subtraction multiplication division inversion AND OR NAND and NOR AMD Advanced Micro Devices ANSI American National Standards Institute APA bidirectional data lines for Port A of PPI A APB bidirectional data lines for Port B of PPI A APC bidirectiona...

Страница 68: ... coded decimal binary a number system with a base of 2 BIOS basic input output system or built in operating system bipolar a signal range that includes both positive and negative values for example 5 V to 5 V BIRQ0 PPI B interrupt request bit for Port A BIRQ1 PPI B interrupt request bit for Port B BNC a type of coaxial signal connector BPA bidirectional data lines for Port A of PPI B BPB bidirecti...

Страница 69: ... signal Analog signals can be single ended or differential For digital signals you group channels to form ports Ports usually consist of either four or eight digital channels channel clock the clock controlling the time interval between individual channel sampling within a scan Boards with simultaneous sampling do not have this clock chromatograph an instrument used in chemical analysis of gases a...

Страница 70: ... for analog or digital output signals D DAC digital to analog converter an electronic device often an integrated circuit that converts a digital number into a corresponding analog voltage or current daisy chain a method of propagating signals along a bus in which the devices are prioritized on the basis of their position on the bus DAQ data acquisition 1 collecting and measuring electrical signals...

Страница 71: ...ew value becomes the new setting You can set default settings for some parameters in the configuration utility or manually using switches located on the device device a plug in DAQ board card or pad that can contain multiple channels and conversion devices Plug in boards PCMCIA cards and devices such as the DAQPad 1200 which connects to your computer parallel port are all examples of DAQ devices S...

Страница 72: ...than one controller or processor dynamic range the ratio of the largest signal level a circuit can handle to the smallest signal level it can handle usually taken to be the noise level normally expressed in decibels E ECL emitter coupled logic EEPROM electrically erasable programmable read only memory EGA enhanced graphics adapter EISA Extended Industry Standard Architecture EMC electromechanical ...

Страница 73: ...are batteries transformers or thermocouples flyby a type of high performance data transfer in which the data bytes pass directly from the source to the target without being transferred to the controller ft feet G GND ground GPIB General Purpose Interface bus synonymous with HP IB The standard bus used for controlling electronic instruments with a computer Also called IEEE 488 bus because it is def...

Страница 74: ...n generation where a device or module accepts or transfers data after a digital pulse has been received Also called latched digital I O hardware the physical components of a computer system such as the circuit boards plug in boards chassis enclosures peripherals cables and so on hardware triggering a form of triggering where you set the start time of an acquisition and gather data at a known posit...

Страница 75: ...aracteristic of the analog I O circuitry input bias current the current that flows into the inputs of a circuit input impedance the measured resistance and capacitance between the input terminals of a circuit input offset current the difference in the input bias currents of the two inputs of an instrumentation amplifier instrument driver a set of high level software functions that controls a speci...

Страница 76: ...Port B I O input output IOH current output high IOL current output low IRQ interrupt request ISA Industry Standard Architecture isolation a type of signal conditioning in which you isolate the transducer signals from the computer for safety purposes This protects you and your computer from large voltage spikes and makes sure the measurements from the DAQ device are not affected by differences in g...

Страница 77: ...alled handshaked digital I O LED light emitting diode library a file containing compiled object modules each comprised of one of more functions that can be linked to other object modules that make use of these functions NIDAQMSC LIB is a library that contains NI DAQ functions The NI DAQ function set is broken down into object modules so that only the object modules that are relevant to your applic...

Страница 78: ...face The MITE supports bus mastering for high speed data transfers over the PCI bus MS million samples MSB most significant bit MTBF mean time between failure multiplexed mode an SCXI operating mode in which analog input channels are multiplexed into one module output so that your cabled DAQ device has access to the module s multiplexed output as well as the outputs on all other multiplexed module...

Страница 79: ...l I O or non handshaking nonreferenced signal sources signal sources with voltage signals that are not connected to an absolute reference or system ground Also called floating signal sources Some common examples of nonreferenced signal sources are batteries transformers or thermocouples O OBF output buffer full signal OBFA output buffer bit for Port A OBFB output buffer bit for Port B onboard chan...

Страница 80: ...the module sends each of its input channels directly to a separate analog input channel of the device to the module passband the range of frequencies which a device can properly propagate or measure pattern generation a type of handshaked latched digital I O in which internal counters generate the handshaked signal which in turn initiates a digital transfer Because counters output digital pulses a...

Страница 81: ...g I O ports Plug and Play devices devices that do not require DIP switches or jumpers to configure resources on the devices also called switchless devices Plug and Play ISA a specification prepared by Microsoft Intel and other PC related companies that will result in PCs with plug in boards that can be fully configured in software without jumpers or switches on the boards PnP Plug and Play port 1 ...

Страница 82: ...cations can use QuickTime to record and display audio and video in the same way applications use system tools to generate and display text and graphics R RAM random access memory RD read signal real time a property of an event or system in which data is processed as it is acquired instead of being accumulated and processed at a later time referenced signal sources signal sources with voltage signa...

Страница 83: ...tored and supervised by a PC scan one or more analog or digital input samples Typically the number of input samples in a scan is equal to the number of channels in the input group For example one pulse from the scan clock produces one scan which acquires one new sample from every analog input channel in the group SCANCLK scan clock signal scan clock the clock controlling the time interval between ...

Страница 84: ...counter input pin where the counter counts the signal transitions SPDT single pole double throw a property of a switch in which one terminal can be connected to one of two other terminals SS simultaneous sampling a property of a system in which each input or output channel is digitized or updated at the same instant S s samples per second used to express the rate at which a DAQ board samples an an...

Страница 85: ... for a given continuous operation calculated to include software overhead Throughput Rate Transfer Rate Software Overhead Factor top level VI VI at the top of the VI hierarchy This term is used to distinguish the VI from its subVIs transfer rate the rate measured in bytes s at which data is moved from source to destination after software initialization and set up operations the maximum rate at whi...

Страница 86: ...ates per second upstream the direction data flow towards the host computer USB Universal Serial Bus V V volts VCC 5 V power supply VDC volts direct current VDMAD virtual DMA driver VEXT external volt VI virtual instrument 1 a combination of hardware and or software elements typically used with a PC that has the functionality of a classic stand alone instrument 2 a LabVIEW software module VI which ...

Страница 87: ...processor or memory manipulates at one time Microprocessors typically use 8 16 or 32 bit words working voltage the highest voltage that should be applied to a product in normal use normally well under the breakdown voltage for safety margin See also breakdown voltage WR write signal Z zero overhead looping the ability of a high performance processor to repeat instructions without requiring time to...

Страница 88: ...uestions C 1 to C 2 ComponentWorks software 1 3 configuration See also installation common questions C 1 to C 2 Plug and Play capability 2 4 connecting power to digital I O lines 3 8 connectors See cable assembly connectors I O connector pin descriptions CPA 7 0 signal table 3 3 CPB 7 0 signal table 3 3 CPC 7 0 signal table 3 3 custom cabling 1 6 customer communication xii D 1 to D 2 D DAQPad 6507...

Страница 89: ...eding maximum ratings note 3 1 F fax and telephone support numbers D 2 Fax on Demand support D 2 floating DIO state 3 11 FTP support D 1 fuse self resetting 3 8 G GND signal table 3 3 H hardware installation 2 1 to 2 4 BP 1 battery pack note 2 2 LED patterns for DAQPad 6507 6508 states table 2 3 power connections figure 2 2 resistors for polarity selection note 2 3 sequence of instructions for pro...

Страница 90: ...al specifications A 2 pin assignments cable assembly connectors pins 1 through 50 figure 3 5 pins 51 through 100 figure 3 6 I O connector pin description figure 3 2 Port C pin assignments 3 4 Plug and Play configuration 2 4 polarity selection resistors used note 2 3 Port A PPI A 3 7 Port B PPI C 3 7 Port C pin assignments figure 3 4 power connecting to digital I O lines 3 8 power considerations 2 ...

Страница 91: ...nstruments application software 1 3 NI DAQ driver software 1 4 to 1 5 specifications A 1 to A 2 digital I O A 1 to A 2 environment A 2 physical A 2 power requirements A 2 SSR OAC 5 and SSR OAC 5A output modules driving note 1 2 STB signal description table 3 12 mode 1 input timing figure 3 13 mode 2 bidirectional timing figure 3 15 suspend mode 2 4 to 2 5 T technical support D 1 to D 2 telephone a...

Страница 92: ...Index National Instruments Corporation I 5 DAQPad 6507 6508 User Manual W WR signal description table 3 12 mode 1 output timing figure 3 14 mode 2 bidirectional timing figure 3 15 ...

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