Line status in PCI-6503 card and NI-DAQ (Legacy) drivers

[DudosoVallekano]

Hello to everyone,

I've a  PCI-6503 card, running in an XP PC with traditional NI-DAQ (Legacy) 7.4.4 driver and I want to know how can I check the status of the lines of an output port. Because there are two applications working together and sending signals through the lines of the same port and It would be interesting if one of that applications could know if the other has changed the line status.

Thank you in advance.

[sendia]

Hello DudosoVallekano,

To automatically detect digital change in a digital line/port, you must use some driver functions and the card must have this feature ("change detection"). I think PCI-6503 doesn't have this feature according to its datasheet and this link:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000PAqXSAW&l=en-US

For cards without this feature, it will be necessary to implement a control loop to checks periodically the line/port state.

Regards,