Deterministic Ethernet Expansion Chassis User's Guide

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NI 9144 User Guide and Specifications 38 ni.com

Note LSB weight is referred to as Gain in the object dictionary.

The calibration data is stored in a U32 array, though each Offset field

(subindex 1, 3, 5, and so on) should be interpreted as a signed value.

Use the calibration coefficients with the following equation to generate

correct data:

raw

(bits) = data returned by the NI 9217 in bits

corrected

= calibrated resistance reading

NI 9219

Table 31. NI 9217 Calibration Coefficients

Coefficient Representation Units

LSB Weight Unsigned pΩ/LSB

Offset Signed μΩ

Table 32. NI 9219 Vendor Configuration Extensions

Index Sub Type R/W Description

0x2001 0 ARR:U32 — Command List = 33

1 R Command Count = 1..32, default = 32

2..33 R/W Configuration Command

0x2002 1 ARR:U32 R Error Status

0x2005 0 U32 R/W ADC Format

corrected

raw

()R

raw

bits()

∗

LSB

weight

pΩ

bits

---------

⎝⎠

⎛⎞

∗

12–

pΩ

-------

⎝⎠

⎛⎞

⎩⎭

⎨⎬

⎧⎫

Offset μΩ()

∗

6–

μΩ

--------

⎝⎠

⎛⎞

–=