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5. Aborting the Digitizers. Following interleaved transfers, the Local bus
chip of each digitizer is left in an active (running) state. Starting with the
leftmost (GENerator) digitizer, it is necessary to ABORt each digitizer
before the next use of the Local bus.
6. Reading Sequence and Format. When this program executes, the
readings are transferred to the memory card (and later displayed) in the
following sequence:
INSerter digitizer channel 2 reading 1
INSerter digitizer channel 1 reading 1
GENerator digitizer channel 2 reading 1
GENerator digitizer channel 1 reading 1
.
.
.
INSerter digitizer channel 2 reading n
INSerter digitizer channel 1 reading n
GENerator digitizer channel 2 reading n
GENerator digitizer channel 1 reading n
The memory card was set up to store the readings in the digitizer’s packed
data format. The packed readings are signed, 16-bit numbers preceded by
the ANSI/IEEE Standard 488.2-1987 Definite Length Arbitrary Block
header. Packed readings are always numbers between -1.0230 (-2046) and
+1.0235 (2047). To convert the readings to voltages, each reading is divided
by 16 to remove the data label bits (0 - 3), and is multipled by 0.0025 which
is the reading resolution for the 5V range (refer to Chapter 3 for more
information on data labels and packed reading conversions).
414 Local Bus Interleaved Transfers Appendix D