CDAQ Data Transfer

[ASTDan]

Hello,

I have a question about the Digital Transfer Mechanism Property (see attached screen shot) for the CDAQ chassis.

I am using a NI 9435 Module.

I have been trying to find some more documentation on how each one works and why it is better than another for a certain situation.

In this example I can only use USB Bulk, and Programmed IO.

When I use USB Bulk if my DI change fast the updates get out of sinc i.e. when a change happens the the change before gets read.

When I use Programmed IO this problem seems to get better however my Digital read times out.

Any advise?

Thanks