National Instruments Deterministic Ethernet Expansion Chassis NI 9144 Manual de usuario descargar pdf (Pagina 36)

NI 9144 User Guide and Specifications 36 ni.com

NI 9217 Conversion Speed Control

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

control field.

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

NI 9217 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

Speed Control Meaning Conversion Rate

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

Bits Field

31:16 Reserved

15:8 Data Offest[t]

7:0 Convert Code[t+1]

Table 26. NI 9217 Vendor Configuration Extensions (Continued)

Index Sub Type R/W Description

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 64 65

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National Instruments Deterministic Ethernet Expansion Chassis NI 9144 Manual de usuario Pagina 36