Data Translation DT9847 Series User Manual

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Data Translation DT9847 Series User Manual Manual pdf 78 page image

Chapter 578Triggering Acquisition on Multiple ModulesNote: For DT9847 Series modules, you can synchronize acquisition on multiple modulesusing the Sync Bus (RJ45) connector, described on page 79.The internal clock on the DT9847 Series modules when the synchronization mode is none (seepage 79), is derived from the USB clock and provides the timing for both the analog input andanalog output subsystems on the module.You can start acquisition on multiple modules by connecting all modules to a shared externaltrigger input, as shown in Figure 23. When triggered, the modules start acquiring data at thesame time.Using this connection scheme, the measurements of one module may not be synchronouswith the measurements of another module due to logic delays in the clocking and USBcircuitry.Figure 23: Triggering Multiple Modules Using an External Trigger SourceHost PCDT9847Series #1USBPort 1DT9847Series #2USBPort 2DT9847Series #nUSBPort n...Device UnderTestExternalTriggerInputsInputsInputs