National Instruments SCXI-1121 Manuel D’Utilisation

On Revision C or later modules, jumper W44 does not exist. SLOT0SEL* 
is always buffered to the INTR* line.

Position 1 connects, after buffering, the SCXIbus MISO line to the 
SERDATOUT pin of the rear signal connector. In this setting, along with 
the proper setting of W32, the data acquisition board can read the Module 
ID Register of the SCXI-1121. See the 

 section later in this chapter, and Chapter 4, 

, for information on reading the Module ID Register. 

See Appendix E, 

, for the pin equivalences of the 

SCXI-1121 rear signal connector and the data acquisition board I/O 
connector. This is the factory-default setting.

Position 3 disconnects SERDATOUT from the SCXIbus MISO line.

On Revision A and B modules, jumper W32 should not be connected. On 
Revision C or later modules, Position 1 connects a 2.2 k

Ω

 pullup resistor 

to the SERDATOUT line (factory-default setting), and Position 3 does not 
connect the pullup resistor to the SERDATOUT line.

Set jumpers W32 and W38 as follows:

If the SCXI-1121 is not cabled to a data acquisition board, the positions of 
these jumpers do not matter, so leave them in their factory default positions 
(both in position 1).

If the SCXI-1121 is cabled to a data acquisition board, and the SCXI 
chassis that the SCXI-1121 is in, is the only SCXI chassis cabled to that 
data acquisition board, leave the jumpers in their factory default positions 
(both in position 1).

If the SCXI-1121 is cabled to a data acquisition board, and there are 
multiple SCXI chassis cabled to that data acquisition board with shielded 
cables (you are using SCXI-1346 shielded cable multi-chassis adapters), 
leave the jumpers in their factory default positions (both in position 1).

If the SCXI-1121 is cabled to a data acquisition board, and there are 
multiple SCXI chassis cabled to that data acquisition board with ribbon 
cables (you are using SCXI-1350 multi-chassis adapters), leave jumper