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Lab-NB User Manual Index-6 © National Instruments Corporation
DAC (digital-to-analog converter)
jumper programming for unipolar or
bipolar voltage, 3-8 to 3-9
programming analog output
circuitry, 4-52
theory of operation, 3-8
updating voltages, 3-8
DAC Configuration Register
description, 4-14
setting up for interrupt
programming, 4-54
DAC0 and DAC1 Data Registers
description, 4-15
interrupt programming of analog output
circuitry, 4-54 to 4-55
loading DAC0 and DAC1 signals, 4-52
DAC0 OUT signal
description (table), 2-7
programming analog output
circuitry, 4-52
DAC1 OUT signal
description (table), 2-7
programming analog output
circuitry, 4-52
DAQ operations, 4-39. See also controlled
acquisition mode; freerun acquisition
mode.
DAQ rates, 3-6 to 3-7
analog input settling time versus gain
(figure), 3-6
bipolar analog input signal range versus
gain (figure), 3-7
Lab-NB maximum recommended DAQ
rates (figure), 3-6
unipolar analog input signal range versus
gain (figure), 3-7
DAQ timing circuitry, 3-4 to 3-7
block diagram, 3-3
multichannel (scanned) data
acquisition, 3-5
single-channel data acquisition, 3-5
theory of operation, 3-4 to 3-7
DAQ timing connections, 2-17 to 2-21
EXTCONV* signal timing (figure), 2-17
NuBus interrupt generation with
EXTUPDATE* signal (figure), 2-20
posttrigger DAQ timing (figure)
EXTCONV* high, 2-18
EXTCONV* low, 2-18
pretrigger DAQ timing (figure), 2-19
waveform generation timing with
EXTUPDATE* signal (figure), 2-20
data acquisition. See controlled acquisition
mode; DAQ entries; freerun acquisition
mode.
DATA signal
description (table), 2-13
mode 1 input timing, 2-14
mode 1 output timing, 2-15
mode 2 bidirectional timing, 2-16
DAVAIL bit
description, 4-9
reading A/D conversion results, 4-37
to 4-38
description, 3-4 to 3-5
DGND signal (table), 2-7
Digital Control Register, 4-29
digital I/O circuitry
block diagram, 3-9
theory of operation, 3-9 to 3-10
digital I/O circuitry, programming, 4-55
to 4-65
82C55A modes of operation, 4-55
to 4-56
mode 0 basic I/O, 4-56
mode 1 bidirectional bus, 4-56
mode 1 strobed I/O, 4-56
single bit set/reset feature, 4-56
control-word format
with control-word flag set to 0
(figure), 4-57
with control-word flag set to 1
(figure), 4-57
interrupt programming, 4-65
mode 0
control words (table), 4-58
programming examples, 4-58 to 4-59
mode 1 strobed input
control words, 4-59 to 4-60
Port C pin assignments (figure), 4-60
Port C status-word bit
definitions, 4-60
programming examples, 4-61
mode 1 strobed output
control words, 4-61
Port C pin assignments (figure), 4-62
Port C status-word bit
definitions, 4-62