Data Translation DT9835, Руководство пользователя

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Chapter 2
16
Operation Modes
DT9835 modules support the following digital I/O operation modes:
• Single-value operations are the simplest to use but do not allow
you to check the interrupt status. Use software to specify the DIN
or DOUT subsystem, the resolution, and a gain of 1 (the gain is
ignored). Data is then read from or written to the appropriate
digital I/O lines.
Single-value operations stop automatically when finished; you
cannot stop a single-value operation.
• Continuous digital input allows you to read digital input values
as well as check the interrupt status of the digital input lines
corresponding to banks 10 and 11. Use software to specify the
DIN subsystem element, continuous mode, the resolution, the
trigger source as software, and the window or procedure to
handle the messages. Once the operation is configured and
started, an event done message is generated when the interrupt
occurs. You can then read the value and determine which digital
I/O line changed state to cause the interrupt.