National Instruments NI 6711 User Manual

Also see for DAQCard-6715: User manual User manual

Contents

National Instruments NI 6711 User Manual Manual pdf 74 page image

Chapter 8 Real-Time System Integration Bus (RTSI)Analog Output Series User Manual 8-4 ni.comsource. If you configure the device to use the internal timebase, you alsocan program the device to drive its internal timebase over the RTSI bus toanother device that is programmed to receive this timebase signal. Thedefault configuration is to use the internal 20MHzTimebase signal withoutdriving the timebase onto the RTSI bus.(NI DAQCard-6715 only) The NI DAQCard-6715 does not interface to theRTSI bus. It can only directly use its own internal 20 MHz timebase as theprimary frequency source.Synchronizing Multiple DevicesWith the RTSI bus and the routing capabilities of the DAQ-STC, thereare several ways to synchronize multiple devices depending on yourapplication. NI recommends that you use a common timebase as theMasterTimebase signal and share any common triggers in the application.One device is designated as the master device and all other devices aredesignated as slave devices.The 20MHzTimebase on the master device is the MasterTimebase signalfor all devices. The slave devices pull this signal from the master deviceacross the RTSI trigger 7 line. Slave devices also pull any shared triggersacross an available RTSI trigger line from the master device. When youstart all of the slave devices before starting the master device, you havesuccessfully synchronized your application across multiple devices.