Analog Output Polarity Selection; Analog Output Data Coding; Table 2-11. Internal And External Reference Selection - National Instruments AT-MIO-16 User Manual

Configuration and Installation

Table 2-11. Internal and External Reference Selection

Analog Output
Channel
0
1

Analog Output Polarity Selection

You can configure each analog output channel for either unipolar or bipolar output. A unipolar
configuration has a range of 0 to V
of -V to +V at the analog output. V
ref ref
output circuitry and can either be the 10 V onboard reference or an externally supplied reference
between -10 V and +10 V. Both channels need not be configured the same way; however, at the
factory both channels are configured for bipolar output.

Analog Output Data Coding.

You must select whether to write to the DAC in straight binary format or two's complement
format. In two's complement mode, data values written to the analog output channel range from
-2,048 to +2,047 decimal (F800 to 07FF hex). In straight binary mode, data values written to the
analog output channel range from 0 to 4,095 decimal (0 to 0FFF hex). Two's complement
coding is best suited to the bipolar analog output mode, which is the AT-MIO-16 factory setting.
Straight binary coding is usually used for the unipolar analog output configuration.
The analog output polarity and data mode configurations are shown in Table 2-12. Table 2-13
shows the relationship of the output range to the polarity.
AT-MIO-16 User Manual
Jumper Settings
Internal (Factory Setting)
W3
EXT
INT
DAC0
W3
EXT
INT
DAC1
at the analog output. A bipolar configuration has a range
ref
is the voltage reference the DACs use in the analog
ref
2-14
External
W2
EXT
INT
DAC0
W2
EXT
INT
DAC1
© National Instruments Corporation
Chapter 2