National Instruments Deterministic Ethernet Expansion Chassis NI 9144 Uživatelský manuál stáhnout pdf (Strana 22)

NI 9144 User Guide and Specifications 22 ni.com

NI 9201/9221 Scan List

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

Bits 23..16 describe the data offset to store a conversion at time t, and

bits 7..0 describe the conversion control code that takes effect

two conversions in the future, at time t+2. On the NI 9201/9221, this

conversion code is a bit flag where bit 0 represents a conversion on channel

0, through bit 7 for channel 7.

So, for example, the scan list entry 0x00010008 indicates this scan stores

at address 1, and the conversion two in the future is channel 3 (bit 3 set = 8).

Table 6 contains the default scan list.

Table 5. NI 9201/9221 Scan List Format

Bits Field

31:24 = 0

23:16 Data Offset[t]

15:8 = 0

7:0 Convert Flag[t+2]

Table 6. NI 9201/9221 Default Scan List

Index Sub Type Value

0x2001 0 ARR:U32 9

1 8

2 0x00000004

3 0x00010008

4 0x00020010

5 0x00030020

6 0x00040040

7 0x00050080

8 0x00060001

9 0x00070002

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 64 65

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National Instruments Deterministic Ethernet Expansion Chassis NI 9144 Uživatelský manuál Strana 22