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Chapter 2
Configuration and Installation
SCXI-1121 User Manual
Position AB-R2 enables the Pseudodifferential Reference mode and
connects the analog reference to the OUTREF pin on the rear signal
connector. Select this mode when the SCXI-1121 has to operate with data
acquisition boards that have a nonreferenced single-ended (NRSE) input. It
is not recommended to use differential-input data acquisition boards when
jumper W33 is in the AB-R2 position.
Jumper
W33
Factory setting in
parking position
W33
Connects the analog
reference to AOGND
(pins 1 and 2 of the
rear signal connector)
W33
Connects SCXIbus
guard to the analog
reference
W33
Enables the
Pseudodifferential
Reference mode
(pin 19 of the rear
signal connector is
connected to the
analog reference)
Table 2-2. Jumper W33 Settings
Description
2-8
Configuration
•
•
•
A
•
•
•
B
R 2
R 1
R 0
•
•
•
A
•
•
•
B
R 2
R 1
R 0
•
•
•
A
•
•
•
B
R 2
R 1
R 0
•
•
•
A
•
•
•
B
R 2
R 1
R 0
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