If you want to invert your hserial, you can do that with the PIC18 devices. Look in the datasheet at the baudcon register, and set RXDTP and TXCKP. This would let you do things like connect to a computer's serial port without using a max RS232 interface. A little more info here: http://www.picbasic.co.uk/forum/showthread.php?t=10361
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