you can read /write to every I/O port, so the registers of the UART-Controller (Serial RS232). but this is low level programming and for me it's 20 years ago, when i was used to this.
i think you want to have something like this:
open_com("COM1",baud,databits,stopbits,parity on, hardware handshake off)
read_com(bytes)
close_com()

if you still in need of a plugin pm me

BTW: nice website