There are plenty of freeware com port software programs, do a google search for 'freeware rs 232 monitor.'
I use one called 'RS-232 Monitor' from www.evmsoft.com
I think it was $10, but it works well, displaying the serial data stream in different format, different #s of columns, rows etc.
You could probably even use the Serial Monitor in the Arduino IDE, set your baud rate to match, and hopefully the tablet puts out data in 8-N-1 format (8 bits, no parity,1 stop bit).
Windows used to come with Hypterminal, not any more tho.