Here is part of something from a past project. The "TRAIN" part is the controversial part. But some how the data slicer needs set up. This is where Houstons site is handy..
SEND:
Code:
 
TRAIN	VAR BYTE

TRAIN=$55

SEROUT PORTC.4,T2400,[TRAIN,TRAIN,TRAIN,TRAIN,TRAIN,9,3]
RECEIVE:
Code:
SERIN PORTC.4,T2400,[9],net
This is just the basic way, you can make it all more reliable by adding checksums and stuff...but this should get you started.