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VALID - when set, logic 1, indicates at least one data sample was lost because it was read by
the personal computer before the next sample was converted. Data was lost because the
sampling rate was too fast for the computer to acquire the data. VALID is reset by writing to
the start conversion register.
CHSL2, CHSL1, CHSL0 - select the multiplexer channel for the analog input signal. (*
denotes only available in single ended input mode).
CHSL3 CHSL2 CHSL1 CHSL0 MUX channel
0000channel 0
0001channel 1
0010channel 2
0011channel 3
0100channel 4
0 1 0 1 channel 5
0110channel 6
0111channel 7
1000channel 8*
1001channel 9*
1010channel 10*
1011channel 11*
1100channel 12*
1101channel 13*
1110channel 14*
1111channel 15*
4.1.2 Start of Conversion Register
The start of conversion register is 16-bit write only and performs two functions:
1. When configured for internal triggering, writing a "0" to this register generates the
software trigger, starting the data conversion process.
2. Writing a "0" to this register at any time resets the VALID bit in the control word
register. This allows the VALID bit to be reset at any time during the conversion
process or before the event of an external trigger.
4.1.3 A/D Converter Data Register
An input to this register returns the last digital value converted by the A/D converter. This
register is 16-bit read only.
DAQ-12 Users Manual 27