Data Acquisition

whereby the first gray level of each sequentialpoint-by-point sample and its position in thesuccession of gray levels is encoded. It is usedwhere there is a tendency for long runs ofrepeated digitized gray levels to occur.ROIROMRSRS-232CRS-422RS-423RS-449RS-485RTSI busS-VideoSimultaneous samplingRegion of interest.Read-only memory. Computer memory in whichdata can be routinely read, but written to onlyonce using special means when the ROM ismanufactured. The ROM is used for storing dataor programs on a permanent basis.Recommended standard, for example, RS-232C.More recent designations use EIA, for example,EIA-232C.Interface between DTE and DCE, employingserial binary data exchange. Typical maximumspecifications are 50 feet at 19200 baud.Interface between DTE and DCE, employing theelectrical characteristics of balanced voltageinterface circuits.Interface between DTE and DCE, employing theelectrical characteristics of unbalanced voltagedigital interface circuits.General purpose 37-pin and 9-pin interface forDCE and DTE employing serial binaryinterchange.The recommended standard of the EIA thatspecifies the electrical characteristics of driversand receivers for use in balanced digitalmultipoint systems.The real-time system integration bus is anadditional connector present on some DASboards, allowing two or more of these boards to beconnected together. It allows the boards to sharedata, timing and interrupt information, at DMAtransfer rates of up to 2.4 MB per second, leavingthe PC bus free for other bus operations.The luminance and chrominance elements of avideo signal are isolated from each other, resultingin a far cleaner image with greater resolution.The ability to acquire and store multiple signals atexactly the same moment. Sample-to-sampleinaccuracy is typically measured in nanoseconds.The PC-30DS board simultaneously samples 16