On our 845X user manual (https://www.ni.com/docs/en-US/bundle/ni-845x-hw-dsw-getting-started/resource/371746e.pdf ), most of the the minimum timeout can be set to 1000 ms (1 sec). We hope that this timeout can be set to even smaller, less than 1 sec.
Or perhaps there is a workaround to further reduce timeout on 8451?
