hi,
technically one ai read will service only one at task and hence you cannot read from more than one device using one ai DAQMx read,
but for a finite acquisition,a logic can be realised where you can put two task in's from two device configurations into an array and use a 'For loop' with a single ai read funtion inside it.
Indexing the two tasks from the array one by one and reading them will do what you want to achieve.
canu plz tell why u want to read from 2 devices using 1 ai read when you can use 2 of them?
regards
dev