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LCD-rs232 PIC CIRCUIT
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RS232 is an asynchronous serial communications protocol, widely used on computers. Asynchronous means it doesn't have any separate synchronising clock signal, so it has to synchronise itself to the incoming data - it does this by the use of 'START' and 'STOP' pulses. The signal itself is slightly unusual for computers, as rather than the normal 0V to 5V range, it uses +12V to -12V - this is done to improve reliability, and greatly increases the available range it can work over - it isn't necessary to provide this exact voltage swing, and you can actually use the PIC's 0V to 5V voltage swing with a couple of resistors to make a simple RS232 interface which will usually work well, but isn't guaranteed to work with all serial ports. For this reason I've designed the Serial Board to use the MAX232 chip, this is a chip specially designed to interface between 5V logic levels and the
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