Data Acquisition

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Table B.4Controller 2: 16-bit (AT only – ports 0C0–0DF)Controller registers: Table B.5DMA controllersB.4 8259 Interrupt controllerThe 8259 programmable interrupt controller accesses an internal register set through twoI/O ports. The 8259 is initialized by loading up to a 4-byte configuration sequence. It then
esponds in an operation mode. Configuration bytes may vary somewhat, due to hardwareimplementations. The port usage shown below is in the operation mode.Interrupt controller #1 ports are 20–21Interrupts are positive-edge sense.Port 20 is used to acknowledge and re-enable the 8259To send non-specific end-of-interrupt code:mov al,maskout 20h,alPort 21 is used to set/clear the masking registerA mask bit = 0=> enable, 1 => disable a specific IRQTo read interrupt mask registerTo write interrupt mask registerin al,21h bit 7 – 0 = IRQ 7 – 0mov al,maskout 21h,alFor 8259 #2 (AT only)Interrupt controller #1 ports are A0–A1Interrupts are positive-edge sense.Port A0 is used to acknowledge and re-enable the 8259To send non-specific end-of-interrupt code:mov al,20hout A0h,alPort A1 is used to set/clear the masking registerA mask bit = 0 = > enable, 1=> disable a specific IRQTo read interrupt mask registerTo write interrupt mask registerin al,A1h bit 7 - 0 = IRQ 15 - 8mov al,maskout A1,al
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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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Page 308 and 309: 11.2 Capturing high speed transient
Page 310 and 311: 12IntroductionThe PCMCIA (PCMCIA st
Page 312 and 313: adapter on a full size computer has
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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
Page 346 and 347: allowing the user to control basic
Page 348 and 349: input.TrunkUARTUnipolar inputsUnloa
Page 350 and 351: Appendix BThe information in this s
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 and 366: Figure B.1Card dimensions for PC/XT
Page 367 and 368: Appendix CThis section contains bri
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 399 and 400: Number of ranges = 1Range #1 -210 t
Page 401 and 402: Range #2 0 to 1372°COrder of polyn
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Number of Ranges = 4Range #1 -50 to
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Number of ranges = 2Range #1 -270 t
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Appendix FF.1 IntroductionAll activ
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Table F.3 gives the conversion betw
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The conversion between binary and h
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F.8 Internal representation of info
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12 which is equivalent to: 1100-4 S
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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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