Chapter 2
Configuration and Installation
©
National Instruments Corporation
2-7
Analog Configuration
The SCXI-1121 has 45 analog configuration jumpers.
Before starting, notice that the jumper configurations for each input
channel and each excitation channel are similar only the jumper numbers
differ. Therefore, when you learn how to set up one channel pair (input and
excitation), you can set up the other channel pairs as well.
Grounding, Shielding, and Reference Mode
Selection
Jumper W33
Position AB-R0 connects the analog reference to the analog output ground
(pins 1 and 2 on the rear signal connector). Select this configuration if you
are using an RSE data acquisition board. It is not recommended to use a
differential input data acquisition board when jumper W33 is in the AB-R0
position.
Position AB-R1 connects the analog reference to the SCXIbus guard.
Position A-R0R1 is the parking position and the factory setting.
W44
Factory setting
(Revision A and B
modules only)
W32
Fatory-default setting;
connects pullup to
SERDATOUT
(Revision C and later)
W32
Parking position
(not connected on
Revision A or B
modules)
Table 2-1.
Digital Signal Connections, Jumper Settings (Continued)
Jumper
Description
Configuration
•
•
•
3
2
1
•
•
•
3
2
1
•
•
•
3
2
1