reading with the asyn record

[Patrick Thomas <thomas_p@ligo-wa.caltech.edu>]

Hi,
Two questions:

1) Does the asyn record block when reading until the requested amount of 
bytes (NRRD) is available in the serial fifo buffer, or does it only 
block until 1 byte is available (like the c read function), or not at all?
2) Is there a way to check that it has gotten all the requested bytes 
into the record before doing a caget on the BINP field to retrieve them?
Thank you for your time,
Patrick