I'm using PCie6509 and I would like to know if there is Hardware characteristics difference (like max current) between driving line (using DAQmxWriteDigitalLines) and driving Port (using DAQmxWriteDigitalU8).
Thank you for your answer
Thank you for posting your question on National Instruments' Forum.
Concerning the differences between the two functions you mentioned, it is simply a matter of line number used to write your pattern.
DAQmxWriteDigitalLines allows you to write your digital pattern line by line, with one unique line or with a combination of different lines regardless of the port they belong to.
DAQmxWriteDigitalU8 allows you to write on 8 adjacent lines belonging to the same port (i.e. you need to have at leat a 8 line port on the board for it to work).
Otherwise, the write function will be the same and the hardware capabilities of the board won't be different withe either one function or the other.
The only limitation I can think of is that you can't exceed 100 mA of total current in sinking/sourcing on one port (see the board specification for more details).
I hope this information will help you.
Guillaume H.National Instruments France
>> NIDays 2011, le mardi 8 février au CNIT de Paris La Défense