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synchronize two pci 6713 boards by RTSI cable

Hi,
 
I have a problem for synchronizing the outputs of two PCI 6713 boards connected by a RTSI bus cable. I use labwindows/CVI 7.0 and Traditional DAQ 7.2. To synchronize the two boards, I use the following code:
/*************************board 1 is the master and board 2 is the slave******************************************/
  //Route Master AO start trigger and output update to RTSI
  Select_Signal (1, ND_RTSI_1, ND_OUT_START_TRIGGER, ND_LOW_TO_HIGH);
  Select_Signal (1, ND_RTSI_2, ND_OUT_UPDATE, ND_HIGH_TO_LOW);            
  //SLAVE imports from RTSI
  Select_Signal (2, ND_OUT_START_TRIGGER, ND_RTSI_1,ND_LOW_TO_HIGH);
  Select_Signal (2, ND_OUT_UPDATE, ND_RTSI_2,ND_HIGH_TO_LOW);
/*******************************************************************************************************************/
But I still get  the outputs from the two boards with a drifting phase difference, any one has any ideas about what are missed for the synchronization code?
 
Thanks

Message Edited by sdbeili on 06-22-2007 07:38 PM

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