There's a schematic & code example in every PBP manual for a direct serial interface to the
PC serial port with SEROUT and SEROUT2.

If you need a schematic for a MAX232 type serial interface, you can download a schematic
for most of the MeLabs development boards.

The LAB-X3 for example;
http://www.microengineeringlabs.com/...abx3sch_06.pdf

Wire the MAX232 circuit up, and Hserout ["Hello World", 13, 10] will send Hello World to the
MCS terminal emulator at 2400 bps.