Data Acquisition

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Table B.23Centronics pin assignments
Appendix CThis section contains brief qualitative information on the Intel 8255 programmableperipheral interface (PPI). Because of the chip’s immense popularity in data acquisitionboards, an entire appendix is devoted to it. For more detailed information on the 8255’soperation, and the associated 8254 timer/counter (detailed in the following appendix),contact Intel for a copy of their data sheets for these chips.The 8255 is used to interface real-world peripherals to the host computer bus. Thesemay be switch sensors, relays, instruments with digital readouts and controls, industrialI/O mounting racks, other computer buses, and so on.The chip has 24 programmable digital I/O lines. The 24 lines are divided into three8-bit ports (named port A, port B and port C). The ports may be programmed either astwo groups of 12 lines (group A and group B) or as 3 individual 8-bit ports. Theports/groups may be operated in three modes: simple I/O (mode 0), strobed I/O (mode 1)and bi-directional I/O (mode 2). The 8255 also allows single bits to be set or reset inport C.
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Practical Data Acquisition forInstr
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Practical Data Acquisition forInstr
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In less than a decade, the PC has b
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PrefaceContentsxvii1 Introduction 1
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Contents vii4.2.1 Hardware interrup
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Contents ix6.2.3 Functional descrip
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Contents xi9.1 Ethernet and fieldbu
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Contents xiii12.5.2 Pin assignments
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Contents xvType R thermocouple 384T
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A data acquisition and control syst
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FilteringIn noisy environments, it
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are capable of programmed I/O and i
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Plug-in expansion boards are common
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50 mRS-232 Communication InterfaceS
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speeds are of the order of 1 Mbyte/
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14 Practical Data Acquisition for I
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3PC based data acquisition (DAQ) sy
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3.2.3 FilteringIsolation performs s
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The transfer characteristics of a p
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Figure 3.7Ideal band pass filter tr
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Figure 3.11Two-stage Butterworth fi
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As individual signal conditioning m
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ThermocouplesDigitalTransmitterDigi
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Examples of floating signal sources
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espect to the measurement system gr
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Figure 3.26Opto-coupler isolation o
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• Using isolation amplifiers to i
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Figure 3.31Physical representation
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field or if the field is caused by
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Where the shield is grounded (i.e.
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mines the amount of noise in the ci
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For full-duplex systems using balan
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4.1.1 DOSusually consist of a small
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With the advent of Windows as a gra
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UNIX shellSimilar to the DOS comman
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available to the expansion bus. A l
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4.2.7 Interrupt service routinesIt
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Whichever CPU is being used, it mus
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• An I/O device requests a DMA tr
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Normal DMA using on-board FIFOThe D
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ferring samples until the counter r
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The read or write command signals (
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Shortened 3-BCLK 8-bit memory acces
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Extended 6-BCLK 16-bit memory acces
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• A cycle which the expansion boa
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Figure 4.13Timing chart of a shorte
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Figure 4.15Timing chart of an exten
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4.7.2 Expanded memory system (EMS)E
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The IBM PC and early versions of th
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Figure 4.17ISA signal mnemonics, si
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data bus. An example of this happen
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NOWSThe /NOWS (NO wait state) signa
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interrupt lines (1RQ13, 8, 2, 1 and
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one application at a time, it is ne
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The need for PCs to exchange data w
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Figure 4.198-bit 21-line I/O board4
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Address decoding on the 24-line pro
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The write cycle is considered in th
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data acquisition and control system
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Adjustable on-board fixed gain ampl
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level applied at the input. When a
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Each step effectively divides the r
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The operation of a dual slope integ
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Code widthThis is the fundamental q
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(a) Unipolar offset error(b) Bipola
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Changes in temperature result in a
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1 LSB. Therefore, an ideal A/D conv
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• The source and level of interru
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5.3.3 Differential inputsTrue diffe
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A/D board can divide the input rang
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a) DC alias caused by sampling at h
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Figure 5.15Frequency spectrum of or
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ate be a minimum of about five time
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Figure 5.20Many aliases combined wi
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initiated. The data is subsequently
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Figure 5.22Time skew between channe
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For each burst trigger, the A/D boa
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Analog output D/A boardsUnlike high
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Like the weighted-current source ne
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The generation of high frequency si
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• The plug-in connector, which pr
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Latched digital I/OFor applications
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y increasing the resistance of R x
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One advantage of this type of relay
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Figure 5.36Waveforms showing genera
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When a counter is configured to ena
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6The standardization of the RS-232
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A duplex system is designed for sen
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Some examples of the HEX and BIN va
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In summary, the optional settings f
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At the RS-232 receiver the followin
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110 850300 800600 7001200 5002400 2
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• Pin 7: Signal ground (common)Th
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6.2.5 Examples of RS-232 interfaces
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terminating resistors, approximatel
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Another commonly used technique, ba
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• Line controlThis applies to hal
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The calculation of the block checks
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The mechanism of operation of the C
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Figure 6.18, has appropriate intern
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77.1 IntroductionAs with other form
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inserted in the device. This is its
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How frequently logged data is uploa
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The following hardware components d
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In a typical stand-alone data acqui
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The maximum battery life that can b
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Input termination resistors, typica
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Figure 7.13 shows the standard conn
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interface, even at high speed, the
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• Use different data formats so t
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Command errors are reported immedia
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• Channel scalingThis automatical
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The channel scan for this type of s
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Data is logged in a fixed non-ASCII
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7.9 Stand-alone logger/controllers
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88.1 IntroductionThe communications
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Figure 8.2GPIB connector (IEEE 488)
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• TalkersA talker is a one-way co
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controller in charge (CIC). The IFC
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Each device connected to the GPIB h
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One of the additional features that
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• The controller temporarily conf
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Table 8.4IEEE 488.2 commandsThe SCP
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Figure 8.9SCPI instrument modelThe
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99.1 Ethernet and fieldbuses for da
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cabling tray etc and the transceive
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transceiver in the MAU and this is
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Advantages of the system include:
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of a cell as well, but these are ig
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Figure 9.8CSMA/CD collisionsAssume
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• PreambleThis field consists of
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of this figure. Some manufacturers
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Grounding has safety and noise conn
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Just as with any technology, each o
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information. The packet is then pla
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There are two types of connectors,
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HOSTClient SoftwareManages Interfac
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Figure 10.6USB connector pinsThere
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The idle states for low- and high-s
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The interrupt transfer type is used
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than in spending a lot of time and
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• The sensitivity of the output/i
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term error (m) in the system and ad
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11.2 Capturing high speed transient
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12IntroductionThe PCMCIA (PCMCIA st
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adapter on a full size computer has
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Pager cards are used in offices and
Page 316 and 317: Size 85.6 mm × 54.0 mmType I 3.3 m
Page 318 and 319: The memory only interface is conver
Page 320 and 321: The AIMS interface supports large d
Page 322 and 323: 12.8 FutureThe card information str
Page 324 and 325: A/D conversion timeAddressAddress r
Page 326 and 327: Back-planeBand pass filterBandwidth
Page 328 and 329: BufferBusBWCache memoryCCDCCIRCCITT
Page 330 and 331: pixel is subjected to a mathematica
Page 332 and 333: data between the computer memory an
Page 334 and 335: FrameFrame grabberFringingFull dupl
Page 336 and 337: so that they interlock. The PAL sta
Page 338 and 339: Lux-secondSI unit of light exposure
Page 340 and 341: NTSCNull modemNumber of channelsNyq
Page 342 and 343: PortPPIPre-triggerProgram I/OProgra
Page 344 and 345: whereby the first gray level of eac
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Page 348 and 349: input.TrunkUARTUnipolar inputsUnloa
Page 350 and 351: Appendix BThe information in this s
Page 352 and 353: Table B.4Controller 2: 16-bit (AT o
Page 354 and 355: B.5 8253/8254 Counter/timer
Page 356: Table B.8Memory map for PC/XT/AT
Page 359 and 360: Table B.10BIOS data area
Page 361 and 362: Table B.15ROMTable B.16AT extended
Page 363 and 364: ← ↔ ← ← ← ↔
Page 365: Figure B.1Card dimensions for PC/XT
Page 369 and 370: the control register of the 8255. T
Page 371 and 372: The bits A7 (MSB) down to A0 (LSB)
Page 373 and 374: Table C.6Instructions for reading o
Page 375 and 376: The program could also enable the I
Page 377 and 378: Group AConfiguration Informationto
Page 379 and 380: C.11 Single-bit set/resetAny of the
Page 381 and 382: Figure C.15Bi-directional bus (mode
Page 383 and 384: Figure D.18254 Block diagramFigure
Page 385 and 386: Figure D.3TCCTRL registerThe functi
Page 387 and 388: This is the data register of the fi
Page 389 and 390: • A simple read operation• A co
Page 391 and 392: The null count bit indicates if the
Page 393 and 394: For even counts: the output is init
Page 395 and 396: Appendix EThe IPTS-68 standard defi
Page 397 and 398: Number of ranges = 2Range #1 -270 t
Page 401 and 402: Range #2 0 to 1372°COrder of polyn
Page 403 and 404: Number of Ranges = 4Range #1 -50 to
Page 407 and 408: Appendix FF.1 IntroductionAll activ
Page 409 and 410: Table F.3 gives the conversion betw
Page 411 and 412: The conversion between binary and h
Page 413 and 414: F.8 Internal representation of info
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DCDCASDCISDCLDDDIODTDTASDTISENDEOIE
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STBSTRSSWNST(T)TETACSTADSTAGTCATCST
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404 IndexDuplex:full duplex 178half
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406 IndexOpen loop control 285see a
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THIS BOOK WAS DEVELOPED BY IDC TECH
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Data Acquisition

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