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route "AI Start Scan" to RTSI with pxi-4472

i'm using several pxi-4472 cards on the same pxi-1006 chassis. i've synchronized the master card (in slot 2) with the slave cards and have routed "AI Start trigger" to RTSI0, so that now the cards collect data samples synchronously. sync_and_stream runs fine.

however, i've been having great trouble routing either "AI scan start" or "Scanclk" to an RTSI line? LV simply just doesn't allow it. i've looked through manual of pxi-4472 but haven't come across any mentioning of this issue. i wonder is this an intrinsic contraint for 4472 that routing these two signals to RTSI is illegal? if yes, what can i do to get around it?
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