root@trb-dev:/home/mod6/fg3# dd iflag=fullblock if=/dev/ttyUSB0 of=fg3.fg3.bin
^C2107976+0 records in
2107976+0 records out
1079283712 bytes (1.1 GB) copied, 142289 s, 7.6 kB/s

root@trb-dev:/home/mod6/fg3# ent fg3.fg3.bin
Entropy = 8.000000 bits per byte.

Optimum compression would reduce the size
of this 1079283712 byte file by 0 percent.

Chi square distribution for 1079283712 samples is 269.42, and randomly
would exceed this value 50.00 percent of the times.

Arithmetic mean value of data bytes is 127.5055 (127.5 = random).
Monte Carlo value for Pi is 3.141423208 (error 0.01 percent).
Serial correlation coefficient is -0.000017 (totally uncorrelated = 0.0).