Resolution; Operation Modes - Data Translation DT9828 User Manual

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Chapter 5

Resolution

The digital input and digital output subsystems on the DT9828 module have a resolution of 4

bits.

DT9828 modules support the following digital I/O operation modes:

• Single-value operations are the simplest to use but offer the least flexibility and efficiency.

• Continuous digital input takes full advantage of the capabilities of the DT9828 module.

You use software to specify the digital I/O port and a gain of 1 (the gain is ignored). Data

is then read from or written to all the digital I/O lines. For a single-value operation, you

cannot specify a clock frequency or trigger source.

Single-value operations stop automatically when finished; you cannot stop a single-value

operation.

You can specify a sampling frequency, conversion mode, trigger source, and buffer for the

operation.

For the DT9828, enter the digital input port as channel 8 in the analog input channel list.

Refer to

page 60

for more information on specifying channels.

The A/D sample clock paces the reading of the digital input port (as well as the

acquisition of the analog input channels); refer to

A/D sample clock.

Note: If the digital input port is in the channel list, that 4-bit value (value 0 to 15) is

returned as float.

page 62

for more information on the

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