Configuration and Installation
Chapter 2
SCXI-1120 User Manual
2-8
© National Instruments Corporation
Table 2-2. Jumper W46 Settings
Jumper
Description
Configuration
W46
Factory setting in parking position
•
•
•
•
•
•
B
A
R
2
R
1
R
0
W46
Connects the analog reference to
AOGND (pins 1 and 2 of the rear
signal connector). Use this connection
with RSE data acquisition boards.
•
•
•
•
•
•
B
A
R
2
R
1
R
0
W46
Connects SCXIbus guard to the analog
reference
•
•
•
•
•
•
B
A
R
2
R
1
R
0
W46
Enables the Pseudodifferential
Reference mode (pin 19 of the rear
signal connector is connected to the
analog reference)
•
•
•
•
•
•
B
A
R
2
R
1
R
0
Direct Temperature Connection
Jumper W41
When your SCXI-1120 is operating with a data acquisition board configured in a differential
mode, such as the MIO board, you can access the temperature sensor only in the Multiplexed-
Output mode. Direct temperature connection is not permissible to the data acquisition board.
This is the factory setting and is position 1 of the jumper block. Position 3 is not explicitly
marked.
If the temperature sensor needs to be accessed in parallel with the other eight outputs, or
scanned–without software interference–along with the other channels, you need to place W41 in
position 3 (this position is not explicitly marked on the module) and to configure your reference
to pseudodifferential or single-ended operation (jumper W46) with your data acquisition board
configured for the same reference scheme. In this position, the direct temperature sensor
connection is made on pin 18 of the rear signal connector and corresponds to ACH15 of the MIO
boards or the PC-LPM-16.
