Keithley DAS-8 Series User Manual page 28

Channel Selection
You can use DAS-8 Series boards to acquire data from a single analog
input channel or from a range of contiguous, on-board analog input
channels using automatic channel scanning. These two methods of
channel selection are described as follows:
• Single channel — You use software to specify a single channel and
initiate a conversion.
• Automatic channel scanning — You use software to specify the first
and last channels in a range of contiguous, on-board channels (0 to 7).
The channels are sampled in order from first to last; the hardware
automatically increments the analog input multiplexer address shortly
after the start of each conversion. When the last address is reached,
the multiplexer returns to the start address and the channels are
sampled again. For example, assume that the start channel is 4, the
stop channel is 7, and you want to acquire five samples. Your program
reads data first from channel 4, then from channels 5, 6, and 7, and
finally from channel 4 again.
An error results if the start channel number is higher than the stop
Note:
channel number.
When using automatic channel scanning, all contiguous, on-board
channels must have the same gain (analog input range).
DriverLINX allows you to acquire data from a range of
Note:
multiple channels that includes channels on expansion boards or MB
Series backplanes. The Expansion Board Configuration for Keithley
DAS-8 Series dialog in DriverLINX of the Special selection of the
Device Subsystem Page allows you to record the settings of your
analog input multiplexers and enable the expansion channels. Refer to
Appendix F: Configuration and Implementation Notes, Keithley
DAS-8 Series manual that accompanies DriverLINX.
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