root@trb-dev:/home/mod6/fg2# stty -F /dev/ttyUSB0 115200 raw -echo -echoe -echok
root@trb-dev:/home/mod6/fg2# dd iflag=fullblock if=/dev/ttyUSB0 of=fg2.fg1.bin
^C2535357+0 records in
2535357+0 records out
1298102784 bytes (1.3 GB) copied, 166626 s, 7.8 kB/s

root@trb-dev:/home/mod6/fg2# ent fg2.fg1.bin
Entropy = 8.000000 bits per byte.

Optimum compression would reduce the size
of this 1298102784 byte file by 0 percent.

Chi square distribution for 1298102784 samples is 268.11, and randomly
would exceed this value 50.00 percent of the times.

Arithmetic mean value of data bytes is 127.4986 (127.5 = random).
Monte Carlo value for Pi is 3.141778462 (error 0.01 percent).
Serial correlation coefficient is 0.000099 (totally uncorrelated = 0.0).
root@trb-dev:/home/mod6/fg2#