National Instruments SCXI-1121 Manuel D’Utilisation

© National Instruments Corporation

channel. See the 

 subsection of the 

 section earlier in this chapter. You 

can use the MIO-16 boards in conjunction with the SCXI-1350 
multichassis adapter for multichassis scanning.

For each chassis, program the modules according to the appropriate mode 
of operation, disregarding the fact that other chassis will be involved.

For example, you want to scan thirteen modules. Twelve modules are in one 
chassis. The thirteenth is in the second chassis and is to be scanned through 
a fourteenth module that is cabled to the data acquisition board but is not 
involved in the scan. Program the twelve modules in the first chassis 
according to the steps in the previous 

 section, and program the thirteenth and fourteenth modules 

 

earlier in this chapter.

The following section describes how to program the Slot 0 circuitry for 
scanning operations. For a more detailed description of the Slot 0 scanning 
circuitry, consult the SCXI-1000/1001 User Manual. Descriptions of the 
Slot 0 registers are given in the section 

 in 

Chapter 4, 

. Skip this section if you are doing 

single-module parallel scanning.

To program the hardscan circuitry, perform the following steps:

1.

Write binary 

0000 0000

 to the HSCR.

2.

Write binary 

0000 1000

 to the HSCR.

3.

Write the Slot 0 scan list to the FIFO.

4.

Write binary 

0010 1100

 to the HSCR.

5.

Write binary 

101S 1100

 to the HSCR.

6.

Write binary 

101S 1110

 to the HSCR.

7.

Write binary 

101S 1111

 to the HSCR.

To program the hardscan circuitry to use the current scan list, perform the 
following steps:

1.

Write binary 

0000 1000

 to the HSCR.

2.

Write binary 

0100 1000

 to the HSCR.

3.

Write binary 

0000 1000

 to the HSCR.

4.

Write binary 

0010 1100

 to the HSCR.