Справочник Пользователя для National Instruments NI 9144

The NI 9217 converts at two pre-defined rates, as controlled by the speed 
control field. 

The conversion rate assumes that 4 channels are in the scan list.

The scan list channel codes consist of three bit fields in a 32-bit entry.

Bits 15..8 describe the data offset to store a conversion at time t, and 
bits 7..0 describe the conversion control codes that take effect 

0x2100

0

ARR:U32

—

Calibration = 16

1

R

Ch0 Offset

2

R

Ch0 Gain

3

R

Ch1 Offset

...

...

...

8

R

Ch3 Gain

9

R

External Ch0 Offset

...

...

...

Table 27.  NI 9217 Conversion Speed Control

31 (0x1F)

High-Accuracy

200 ms/channel (800 ms total)

2 (0x02)

High-Speed

2.5 ms/channel (10 ms total)

Table 28.  NI 9217 Scan List Format

31:16

Reserved

15:8

Data Offest[t]

7:0

Convert Code[t+1]

Table 26.  NI 9217 Vendor Configuration Extensions (Continued)