Quote Originally Posted by ScaleRobotics View Post
if that is the case,

You can invert the comms for the pic18f4550. This will make it possible to talk to a modem without a rs232 chip: http://www.picbasic.co.uk/forum/showthread.php?t=10361
I found it on page 240(datasheet) BAUDCON: BAUD Rate Control Register
Bit 4
1 = TX data is inverted
Bit 5
1 = RX data is inverted
Please correct me if I'm doing it wrong...
Baudcon.4 = 1
Baudcon.5 = 1

regards,
tacbanon