Using dummy task to synchronize other tasks

Hi,
Environment: NIDAQmx 7.4 - ANSI C
Is there a way to use a dummy task to synchronize the starting of other tasks? What I need to do is to make sure that multiple tasks (AIN, CTRs) are simultaneously started. I was hoping that there might be some way to route the start trigger from the dummy task to a terminal (e.g. RTSI-2) and then have all my other tasks (armed and waiting for a pulse to come along on RTSI-2) start when RTSI-2 pulses.
In the past I would setup my counters to gate off of an RTSI pin, and then routine my AIN tasks's sample clock to the same RTSI pin. I would then start the CTR tasks first, followed by the AIN taks. This all worked OK until I got a "DMA error" (-20078) when using E-series cards. The error text suggests that I need to start the AIN task before the CTR task. But doing so adds a time skew between the AIN and the counter cards. I am hoping to circumvent this by having ALL tasks gate off a signal (e.g. RTSI-2), and using a dummy task to pulse the RTSI pin.
Is this possible? If so, can you point me to some documentation on how to do this?
Thanks in advance,
-bill

Hi Bill,
You can definitely synchronize multiple tasks from a same start trigger. You can do this using the RTSI cable but also you can use the internal signal sampling clocks as start triggers.
First you will have to configure your RTSI in MAX. This can be done by right-clicking on Devices and Interfaces -> NI-DAQmx Devices and choosing Create New NI-DAQmx Device -> RTSI Cable. Then, for each device that is connected to the RTSI cable, use MAX to edit its properties and in the "RTSI Configuration" tab, specify the RTSI cable. This will allow NI-DAQmx to automatically route signals of the RTSI cable.
Actually, the discussion forum http://forums.ni.com/ni/board/message?board.id=250&message.id=9743&requireLogin=False explains in detail how setup the time bases and synchronize the each of the tasks using the DAQmxGetMasterTimebaseSrc function. Please also refer to synchronization examples in the C:\Program Files\National Instruments\NI-DAQ\Examples\DAQmx ANSI C\Synchronization.
Also, if you decide just to use the internal sampling clock option, when you set up the timing for the task by using the function DAQmxCfgSampClkTiming(), for the source parameter you can specify the same start trigger for all tasks (for example Dev1/ao/Start trigger). Daqmx will automatically synch the start of all tasks once the source is specified.
Regards,
Natasa

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Update: I decided to try using a counter as the source clock. One cannot use counter 0 to accomplish this, but it does appear to work with counter 1.
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