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a Digital Output problem of PXI-6259 using DAQmx and VC++

The problem I encountered is that:
the PXI-6259 have a clocked DIO port P0 with 32 lines ,
and I used lin0:lin7 for digital pattern generation,
i also want to use line8:line24 for other digital output use, but i found line8 : 24 output stay at"0" when I write to control them to be "1"
i create two tasks :
1. m_PXI6259DOPulseGenTask->DOChannels.CreateChannel"PXI1Slot2/port0/line0:7", "",DAQmxOneChannelForAllLines);
and use the WriteMultiSamplePort() to give the generation data;
2.m_PXI6259DOSignGenTask->DOChannels.CreateChannel"PXI1Slot2/port0/8:24", "",DAQmxOneChannelForAllLines);
use the WriteSingleSamplemuliteLine() to generate the output code

how can i solve the problem?
thanks.
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