Chapter 5 Programming
SCXI-1121 User Manual 5-16 www.natinst.com
2. Following the procedure given in the Register Writes section, write
00000000 00000000 to the Configuration Register of the
SCXI-1121 in Slot 2. This step resets the module, including the
clearing of the AB0EN bit (bit 0). Notice that a complete reset of this
module is not necessary, but is used for simplicity.
3. Following the procedure given in the Register Writes section, write
100XXX00 00001111 to the Configuration Register of the
SCXI-1121 in Slot 4.
4. Following the procedure given in the Register Writes section, write
010XXX01 00001111 to the Configuration Register of the
SCXI-1121 in Slot 1.
5. Following the procedure given in the Register Writes section, write
010XXX11 00001111 to the Configuration Register of the
SCXI-1121 in Slot 3. Notice that after Channel 3, the SCXI-1121 will
wrap around to Channel 0.
6. Follow the steps given in the section earlier in this chapter,
3. Programming the Slot 0 Hardscan Circuitry, where step 3, Write the
Slot 0 scan list to the FIFO, consists of the following:
a. Write 00000000 00000010 to the FIFO Register. This
corresponds to Slot 1 for three samples.
b. Write 00000001 10000001 to the FIFO Register. This
corresponds to Slot 4 for two samples.
c. Write 00000001 00000011 to the FIFO Register. This
corresponds to Slot 3 for four samples.
Make sure to toggle SLOT0SEL* or reselect the FIFO Register from
scratch between steps 6a, 6b, and 6c.
7. Follow the procedure given in the 4. Acquisition Enable, Triggering,
and Servicing section earlier in this chapter.
Example 3
You want to scan four channels on an SCXI-1121 in Slot 4 of Chassis 1,
then two channels of an SCXI-1121 in Slot 11 of Chassis 2, one channel of
an SCXI-1121 in Slot 3 in Chassis 3, and three channels of an SCXI-1121
in Slot 8 of Chassis 3.