rcom is a small tool which captures serial dumps. Compiled and tested under unix.
For capturing my null modem serial I use:
rcom -l -s 115200 /dev/ttyS0
Typing ‘rcom’ without arguments will print the options.
Since version 1.2 you can use ‘tip’-like syntax as:
rcom ttya115200
Download here. Since 2016, there’s a git repository.
This software was almost entirely written by Olivier Piras and is the first and only project he (almost) completed!