National Instruments SCXI-1121 - Manual (Page 21)

Chapter 2 Configuration and Installation
© National Instruments Corporation 2-5 SCXI-1121 User Manual
W38 in its factory default position (position 1). On all but one of the
SCXI-1121s that are cabled to the data acquisition board, move jumper
W32 to position 3. It does not matter which of the SCXI-1121 modules that
are cabled to the data acquisition board has jumper W32 set to position 1.
If you have different types of modules cabled to the data acquisition board,
those different modules will have jumpers similar to W38 and W32 of the
SCXI-1121. Set those jumpers on the different modules using the same
method described here for the SCXI-1121.
On Revision A and B SCXI-1121s, jumper W32 is not used. You set jumper
W38 as explained in the cases above, except in the case of a multiple
chassis ribbon cable system. In a multichassis ribbon cable system with
Revision A and B SCXI-1121s cabled to the data acquisition board, you can
access the MISO line in only one chassis. Pick one of the chassis and set
jumper W38 to position 1 on the SCXI-1121 in that chassis that is cabled
to the data acquisition board. On the SCXI-1121s that are in the other
chassis and cabled to the data acquisition board, set jumper W38 to
position 3. Notice that you will only be able to access digital information
from the chassis that has the SCXI-1121 with jumper W38 set to position 1.
Table 2-1. Digital Signal Connections, Jumper Settings
Jumper Description Configuration
W38 Factory setting;
connects MISO to
SERDATOUT
W38 Parking position
W45 Factory setting
•
•
•
3
2
1
•
•
•
3
2
1
•
•
•
3
2
1