User manual

Chapter 3: Architecture
50
Data format
Data in the data stream has the following format. Each two
consecutive bytes contain a single sample from the A/D converter.
Data is stored repeatedly sample by sample for all channels in the
channel list. (Table 19 shows a PowerDAQ 16-bit board data format.
For PowerDAQ 12-bit boards, only 12 LSBs (Least Significant Bits) are
valid. PowerDAQ II boards automatically place zeroes in any unused bit
locations.)
Table 21: Data Format Table for a 16-bit Board
Table 22: PowerDAQ II 12-bit data format
Table 23: PowerDAQ II 14-bit data format
Table 24: PowerDAQ II 16-bit data format
1st channel 2nd channel … last channel 1st channel …
sample sample sample sample
bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit8 bit7 bit6 bit5 bit4 0x0 0x0 0x0 0x0
bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit8 bit7 bit6 bit5 bit4 bit3 bit2 0x0 0x0
bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0