National Instruments NI 9144, User Manual

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NI 9144 User Guide and Specifications
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© National Instruments
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Refer to the C Series Modules with No Configurable Options section for all other supported
C Series modules.
NI 9201/9221
The vendor configuration extensions for the NI 9201/9221 are listed in Table 4.
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.
Table 4.
NI 9201/9221 Vendor Configuration Extensions
Index Sub Type R/W Description
0x2001 0 ARR:U32 — Scan List = 9
1 R Channels to Convert = <1..8>, default = 8
2..9 R/W Channel Code
0x2002 0 U32 R/W Fast Convert = 0/1, default = 1 (fast)
0x2100 0 ARR:U32 — Calibration = 32
1 R Ch0 Offset
2 R Ch0 Gain
… — —
15 R Ch7 Offset
16 R Ch7 Gain
17 R External Calibration, Ch0 Offset
… — —
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]