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TTL to RS232 adaptor
How to build a simple TTL to RS232 adaptor for your microcontroller projects?
There is a good explanation of RS232 interface available atwebsite.
Just about every microcontroller available today includes at lest one UART or serial port. Serial ports are the most common way to communicate with a uC or other devices such as GPS receivers. The most common interface type is RS232, only a simple conversion from the logic level signals of the uC serial RX and TX pins is required to work with RS232.