Data Translation DT9800 Series, User Manual

Page: 27 / 162

Principles of Operation
15
2
2
2
2
2
2
2
2
2
Started Manual for more information on wiring to inputs and
configuring the driver to use bias return termination resistance.
Note: For pseudo-differential inputs, specify single-ended in
software; in this case, how you wire these signals determines the
configuration.
The DT9800-EC Series boards do not provide isolated analog
ground.
The DT9800 Series function modules can acquire data from a single
analog input channel or from a group of analog input channels.
Channels are numbered 0 to 15 for single-ended and
pseudo-differential inputs, and 0 to 7 for differential inputs. The
following subsections describe how to specify the channels.
Specifying a Single Channel
The simplest way to acquire data from a single channel is to specify
the channel for a single-value analog input operation using software;
refer to
page 26 for more information on single-value operations.
You can also specify a single channel using the analog input channel
list, described in the next section.
Note: If you want to perform a single-value digital input operation
while the A/D subsystem is configured, specify channel 16 (which
corresponds to the digital input port) in the A/D single-value
operation.