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When I Connect DPULL to +5V on my DIO Board, the Data Lines Never Go Low When the DPULL line is not used, everything works as expected. When I connect the DPULL input to +5V, the data lines never go low. Why is this? URL: http://digital.ni.com/public.nsf/allkb/2FAE78FE22CA3D4A86256F3400723115

Why Am I Reading Negative Values From My Digital I/O Board? When using Visual Basic or C functions to read from my digital I/O board, (e.g., PCI-653x), the returned value is negative. How is this possible? URL: http://digital.ni.com/public.nsf/allkb/11962F97C36675BB86256F34006E36A0

Problem Controlling Relays with Digital Lines Why am I having a problem controlling relays using the digital lines from my DAQ board? Sometimes the relays work and sometimes they don't. URL: http://digital.ni.com/public.nsf/allkb/89FB08919072A35686256F2600091E45

Port Configuration and Bidirectional Options for PCMCIA-DIO-24 Why do the ports of the DIO-24 reset to zero during configuration and reconfiguration? How do I use a port to both read and write without having this happen? URL: http://digital.ni.com/public.nsf/allkb/4D8A03053C459C2F86256F0A005B1279

Interrupt Driven Transfers Using an External Clock with a PCI-6534 I am doing patterned input with a PCI-6534 using an external clock, and I want to read the digital lines on every clock edge. Why does it take multiple pulses from my external clock to read data on the digital ports?For Example:When I read from 1 port, I am only able to read data on URL: http://digital.ni.com/public.nsf/allkb/8663E8833FB4173C86256EEF0079C6CB

PCI-6534使用外部时钟进行中断驱动的数据传输 我在使用外部时钟用PCI-6534做模式输入，我想在每一个时钟沿读取数字线。为什么读取数字端口上的数据时要占用多个周期的外部时钟？例如：读取1个端口的数据时，每32个时钟周期才能读取一次。读取2个端口的数据时，每16个时钟周期才能读取一次 URL: http://digital.ni.com/public.nsf/allkb/A20029C26CCCD27D862572AC003ECE7C

How do I Set Programmable Power Up States and What Boards Support them? How Do I Set Programmable Power Up States and What Boards Support Them? URL: http://digital.ni.com/public.nsf/allkb/A98392F93E54D07786256E6F004DE4C3

DIOのPull-up,Pull-downの設定方法について（PCI-DIO-96, PXI-6508, PCI-6530） DIOのPull-up,Pull-downの設定がわからないのですがどのようにすればいいのですか？ URL: http://digital.ni.com/public.nsf/allkb/901A0ED437B9EB4986256E6F0016E2B4

How Do I Enable Digital Filtering on My PCI-6509? I have a PCI-6509, which has the ability to filter my input signals. How do I enable this feature and set the parameters in my program? URL: http://digital.ni.com/public.nsf/allkb/BF72940804FAE51486256E6900005D6C

How Do I Set the Power-Up State of the PCI-6527? The PCI-6527 power-up state is set to high by default. I would like to change the power-up state to low. How do I do this? URL: http://digital.ni.com/public.nsf/allkb/7321133781C638A886256E39005CB0B3