Check VERY carefully, the data sheet of your 232 driver.
I've seen some that were rated for "up to 115200" fail at 57,600 and below.
A scope is VERY helpful.  If the data is starting to look like a trapezoid,
then you're about as fast as you can go.

--
Feel the power of the dark side!  Atmel AVR
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist