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Chapter 6
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Synchronizing A/D and D/A Subsystems
You can synchronize the operation of the A/D and D/A subsystems providing that they are
not performing single-value operations. Refer to
page 110 and page 125 for more information
on single-value operations.
You can synchronize the A/D and D/A subsystems in two ways: by synchronizing the
triggers and by synchronizing the clocks. This section describes these two methods.
Synchronizing the Triggers
You can synchronize the triggers of the A/D and D/A subsystems as follows:
• Software trigger – Using software, specify the trigger source for the A/D and D/A
subsystems as the software trigger. Then, using software, allocate a simultaneous start list,
put the A/D and D/A subsystems on the simultaneous start list, prestart the subsystems,
and start the subsystems. When started, both subsystems are triggered simultaneously.
• External digital (TTL) trigger – Using software, specify the trigger source for the A/D
and D/A subsystems as the external digital (TTL) trigger. Then, wire an external digital
TTL trigger to both the A/D subsystem and the D/A subsystem. Using software, allocate
a simultaneous start list, put the A/D and D/A subsystems on the simultaneous start list,
prestart the subsystems, then start the subsystems. When started, both subsystems are
triggered simultaneously when the external digital event occurs.
• External Analog threshold trigger – This option is supported only when using the
DataAcq SDK; it is not supported using the DT-Open Layers for .NET Class Library.
Using software, specify the trigger source for the A/D and D/A subsystems as the
external analog threshold trigger. Then, wire an external analog threshold trigger to the
screw terminal panel. Using software, allocate a simultaneous start list, put the A/D and
D/A subsystems on the simultaneous start list, prestart the subsystems, then start the
subsystems. When started, both subsystems are triggered simultaneously when the
external analog event occurs.
• One of the analog input channels – Using software, specify the trigger source for the
A/D and D/A subsystems as one of the analog input channels. Then, wire an external
analog threshold trigger to one of the 32 or 16 analog input channels (depending on the
channel type specified). Using software, allocate a simultaneous start list, put the A/D
and D/A subsystems on the simultaneous start list, prestart the subsystems, then start the
subsystems. When started, both subsystems are triggered simultaneously when the
external analog event occurs on the specified analog input channel.