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Multiple triggers

Hi!
I need to take pictures from two cameras using a 1408 board.Using the function

imgSessionWaitSignalAsync(SessionID,IMG_EXT_RTSI0,IMG_TRIG_POLAR_ACTIVEL,OnTriggerCam0,NULL)

imgSessionWaitSignalAsync(SessionID,IMG_EXT_RTSI0,IMG_TRIG_POLAR_ACTIVEL,OnTriggerCam1,NULL)

it is posible a triggered based acquisition. But when the board receives 2 triggers (RTSI0 and RTSI1) the two images appears "break". Why this happens?
Thanks.
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are the chanels always alternated?
 
Regards
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