Measurement Computing DAC488 v.1 - Manual (Page 30)

24 DAC488 Operation DAC488 User’s Manual
Command Support
Support for the above commands, includes the Query ( ? ) command extension, and the use of the Serial Poll
Status Byte. Refer to Chapter 7 for more details.
Port Triggering
Triggering is the process of changing a DAC
output at the occurrence of a trigger event.
The three trigger events which can trigger a
DAC port are: a Trigger On (
@ ) command, an
IEEE Group Execute Trigger ( GET ) or an
external trigger pulse applied to the external
trigger/SRQ input. Any DAC port may be
configured to trigger on one or more of these
trigger sources. These trigger sources and
their relationship to a DAC port are shown in
the following diagram.
As shown in the diagram, the trigger sources
are routed to the ports by using the trigger
mask commands. The trigger mask
commands are illustrated as switches. The
trigger mask commands are used to enable a
trigger source to trigger the selected DAC
port. All trigger signals are then combined to
allow a port to be triggered upon the
occurrence of any of the three trigger events.
Triggering is provided as a means of
synchronizing multiple DAC ports. Voltages
may be output at two or more ports
simultaneously by programming each port for
the desired voltages and trigger event(s).
When the trigger event occurs, the
programmed voltages will appear at the ports
simultaneously.