starting a read task, after a write-task was active, all lines (even outputs) will be set to zero

[lukasroeder]

Hi...

i ve som problems with simple daqmx read/write.

I'v got a DIO24 pci card (NI PCI-6503). the card has 3 ports by 8 bits,  wich each can bi configurated as input or as output.

When i start a read, i stop the write-task and start the read-task. the problem there is, that starting the read-task (with DAQmxStartTask), all lines of this port are going to zero. i only have two input lines, the other are outputs.

is it possible, that starting the read-task dont clear de whole port ?

i'm programming with the daqmx lib over labwindows cvi 2013 ...

thanks and excuse my bad english

king regards

lukas roder

[Stephan_D]

Hey lukas,

I have never used the bidirectional function of this device. This documents may help you:

CVI - DAQmx : How do I configure a channel as bidirectional? - Discussion Forums
http://forums.ni.com/t5/Digital-I-O/CVI-DAQmx-How-do-I-configure-a-channel-as-bidirectional/td-p/947...

NI PCI-6503 Supported Properties - NI-DAQmx C Reference Help - National Instruments
http://zone.ni.com/reference/en-XX/help/370471W-01/cdaqmxsupp/pci-6503/

Stephan