4m TRH at Marshall started generating intermittent data starting around 00:00 LT, May 30, and appears to have quit altogether by 04:00
If you let it run long enough, data_stats shows a record length of 8191 bytes which indicates that the data system is not finding a terminator (newline) in the data:
marshall:/dev/ttyS11 2 410 1 2009 06 01 17:18:06.062 06 01 17:18:06.062 nan 0.000 0.000 8191 8191
data_dump shows that the data is all NULLs (0x00):
cd /data/projects/ASP09/raw_data:
data_dump -i 2,410 -A isff_20090601_160000.dat