Data Translation DT3000 Series, User Manual, Page: 81 / 156

Chapter 6
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Using software, specify the trigger source as an external, positive digital (TTL) trigger for
a rising-edge external trigger or an external, negative digital (TTL) trigger for a
falling-edge external trigger.
Note: The external digital trigger is also used to trigger analog input operations.
• External User Gate – This trigger type is supported using the DataAcq SDK only for
analog output operations. An external trigger event can occur when the DT3000 Series
board detects either a rising or falling edge on the external gate input signal connected to
TB5 on the DT730 or DT730-T screw terminal panel (pin 5 of connector J1 on the DT3000
Series board). The gate signal is TTL-compatible.
When it is recognized, the D/A output clock is enabled. Subsequent triggers are ignored
(trigger lockout) until the operation is complete. Once the operation is complete, the board
can detect another trigger event.
Using software, specify the trigger source as a falling-edge external gate (extra+1 for
DataAcq SDK users) or rising-edge external gate (extra+2 for DataAcq SDK users).
Note: The external user gate is also used to trigger counter/timer operations.
Analog Output Conversion Modes
DT3000 Series boards support single-value and continuously paced conversion modes. These
modes are described in the following subsections.
Single-Value Operations
Single-value operations are the simplest to use but offer the least flexibility and efficiency. Use
software to specify the range, gain, and analog output channel (among other parameters), and
output the data from that channel. For a single-value operation, you cannot specify a clock
source, trigger source, or buffer.
Single-value operations stop automatically when finished; you cannot stop a single-value
operation.
Continuously Paced Operations
Continuous analog output operations take full advantage of the capabilities of the DT3000
Series boards. In this mode, you can specify a channel list, clock source, trigger source, buffer,
and buffer wrap mode.
Use continuously paced analog output mode if you want to accurately control the period
between conversions of individual analog output channels in the analog output channel list.
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