National Instruments SCXI-1121 Manuel D’Utilisation

© National Instruments Corporation

+5 V signal

front connector (table), 2-18, D-3
SCXIbus connector (table), 3-4

AB0+ signal (table), 3-4, C-3
AB0- signal (table), 3-4, C-3
AB0EN bit, 4-4
AC-coupled signal connections

external resistor required, 2-21
floating (figure), 2-21
referenced to chassis ground (figure), 2-20

acquisition enable, programming, 5-14 to 5-15
analog and timing circuitry, 3-8 to 3-16

analog input channels, 3-8 to 3-11
analog output circuitry, 3-15 to 3-16
calibration, 3-11 to 3-14
excitation output channels, 3-11

analog configuration, 2-6 to 2-13

excitation jumpers, 2-9 to 2-13

current and voltage jumpers, 

2-9 to 2-10

excitation level, 2-10 to 2-11
internal half-bridge completion, 

2-12 to 2-13

grounding, shielding, and reference mode 

selection, 2-6 to 2-7

input channel jumpers, 2-8 to 2-13

excitation jumpers, 2-9 to 2-13
filter jumpers, 2-9
gain jumpers, 2-8

jumper W33, 2-6 to 2-7

analog input channels

block diagram, 3-9
signal connections, 2-20 to 2-22

AC-coupled, with high common-mode 

voltage (figure), 2-21

exceeding input range and 

common-mode input range 
(warning), 2-22

floating, referenced to chassis ground 

(figure), 2-20

floating AC-coupled (figure), 2-21
ground-referenced, with high 

common-mode voltage (figure), 2-20

theory of operation, 3-8 to 3-11

analog input specifications, A-1 to A-2
analog output circuitry, 3-15 to 3-16
analog output signal connections, 2-39
AOGND signal (table), 2-38, B-2

bits

AB0EN, 4-4
CHAN<1..0>, 4-4
CHS<4..0>, 4-6
CLKEN, 4-8
CLKOUTEN, 4-3
CLKSELECT, 4-3
CNT<6..0>, 4-9
FOUTEN*, 4-5
FRT, 4-7
HSRS*, 4-7
LOAD*, 4-7
ONCE, 4-7
RD, 4-7
RTEMP, 4-4
SCAL, 4-3
SCANCLKEN, 4-4
SCANCONEN, 4-4, 4-8
SL<3..0>, 4-6