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© National Instruments Corporation Index-13 Lab-PC+ User Manual
8253 Counter/Timer Register
Groups A and B, D-23 to D-32
8255A Digital I/O Register Group,
D-33 to D-37
Analog Input Register Group, D-15 to D-20
Analog Output Register
Group, D-21 to D-22
Configuration and Status Register
Group, D-4 to D-14
Interval Counter Register
Group, D-38 to D-40
programming considerations, E-1
register map (table), D-2
sizes, D-3
relative accuracy
analog input, A-3
analog output, A-4
RSE input (eight channels)
configuration, 2-12
definition (table), 2-11
signal connection considerations
recommended configurations (table), 3-6
single-ended connections, 3-10 to 3-11
S
sample interval counter. See Counter A0 Data
Register.
sample interval timer, 4-6
SCANEN bit
channel scanning, E-17
controlled acquisition mode, E-6
posttrigger mode, E-12
pretrigger mode, E-14
description, D-5
freerun acquisition mode, E-9
multiple A/D conversions
interval scanning, E-17 to E-18
single-channel interval acquisition
mode, E-18 to E-19
scanned (multiple-channel) data
acquisition, 4-6 to 4-7
SE/D bit, D-13
signal connections
analog input connections, 3-4 to 3-5
analog output connections, 3-12 to 3-13
cabling considerations, 3-28
digital I/O connections, 3-13 to 3-20
illustration, 3-15
Mode 1 input timing, 3-18
Mode 1 output timing, 3-19
Mode 2 bidirectional timing, 3-20
Port C pin connections, 3-15 to 3-16
timing specifications, 3-16 to 3-17
input configurations, 3-6 to 3-28
common-mode signal rejection
considerations, 3-12
differential connection
considerations, 3-6 to 3-9
floating signal sources, 3-8 to 3-9
ground-referenced signal sources,
3-7 to 3-8
recommended configurations for
ground-referenced and floating
signal sources (table), 3-6
single-ended connection
considerations, 3-10 to 3-12
floating signal sources (RSE
configuration), 3-10 to 3-11
grounded signal sources (NRSE
configuration), 3-11 to 3-12
I/O connector pin assignments (figure), 3-2
I/O connector signal connection descriptions
(table), 3-3
timing connections, 3-21 to 3-28
data acquisition timing connections,
3-21 to 3-24
general-purpose timing connections,
3-24 to 3-28
types of signal sources, 3-5 to 3-6
floating signal sources, 3-5 to 3-6
ground-referenced signal sources, 3-6
signal sources. See floating signal sources;
ground-referenced signal sources.
single bit set/reset control words, Mode 2
operation, E-33
single bit set/reset feature, Mode 2
operation, E-34
single-channel data acquisition, 4-6
single-channel interval acquisition mode, for
multiple A/D conversions, E-18 to E-19
single-channel interval timing (figure), 4-14
single-ended connection
considerations, 3-10 to 3-12
criteria for use, 3-10
floating signal sources (RSE
configuration), 3-10 to 3-11