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National Instruments Corporation
25
NI 9144 User Guide and Specifications
Bits 23..16 describe the data offset to store a conversion at time
t
, and
bits 3..0 describe the conversion control code that will take effect
two conversions in the future, at time t+2
. On the NI 9203, bit 3 determines
whether the result is bipolar (signed) or unipolar (unsigned), and bits 2..0
are the channel number reversed.
So, for example, the scan list entry
0x00010006
indicates that this scan gets
stored at address 1, and the conversion two is a bipolar channel 3
(3 reversed = 6).
3
Bipolar = 0, Unipoloar = 1
2:0
Channel Code[
t
+2]
Table 10.
NI 9203 Channels/Reversed Bits
Channel
Reversed Bits
0 = 0b000
0b000 = 0
1 = 0b001
0b100 = 4
2 = 0b010
0b010 = 2
3 = 0b011
0b110 = 6
4 = 0b100
0b001 = 1
5 = 0b101
0b101 = 5
6 = 0b110
0b011 = 3
7 = 0b111
0b111 = 7
Table 9.
NI 9203 Scan List Format (Continued)
Bits
Field