Data Acquisition

allowing the user to control basic board functions,such as setup and data acquisition. These can beincorporated into user-written programs to createa simple but functional DAS system. Many boardscome with drivers supplied.Software triggerSpaceSpatial filteringSpatial resolutionSpeed/typical throughputStatistical multiplexerStraight through pinningStrobeSwitched lineSyncSynchronizationSoftware control of data acquisition triggering.Most boards are designed for software control.Absence of signal. This is equivalent to a binaryzero.In image processing, the enhancement of an imageby increasing or decreasing its spatial frequencies.A measure of the level of detail a vision system candisplay. The value, expressed in mils or inches perpixel, is derived by dividing the linear dimensionsof the field of view (x and y, as measured in theimage plane), by the number of pixels in the x andy dimensions of the system’s imaging array orimage digitizer.The maximum rate at which the board can sampleand convert incoming samples. The typicalthroughput is divided by the number of channelsbeing sampled, to arrive at the samples/second oneach channel. To avoid false readings, the samplesper second on each channel need to be greaterthan twice the frequency of the analog signalbeing measured.Multiplexer in which data loading from multipledevices occurs randomly throughout time, incontrast to standard multiplexers where dataloading occurs at regular predictable intervals.RS-232 and RS-422 configuration that match DTEto DCE (pin 1 with pin 1, pin 2 with pin 2, etc).A handshaking line used to signal to a receivingdevice that there is data to be read.A communication link for which the physical pathmay vary with each use, such as the publictelephone network.A sync, pulse ensures that the monitor displayingthe information is synchronized at regularintervals with the device supplying the data, thusdisplaying the data at the right location. E.g. async pulse would be used between a camera and adisplay device to reset the image to the top of theframe for the beginning of the image.The co-ordination of the activities of several