See this tutorial for one example on how to build a 3.3 V to RS-232 level converter with a breadboard, a MAX3232CPE IC and five 0.1 ♟ capacitors. If you wish to connect one of these, you need a board or adapter to convert the signal levels. The ports use 0V and 3.3 V logic levels, not 0 & +5V TTL levels or the +/-12 V used by RS-232 serial ports found on some older PCs. The Broadcom chip at the heart of the Raspberry Pi has low power serial ports with limitations of voltage and protocol compatibility. You will also need to connect the Ground pins of the two devices together. To connect to another serial device, you connect the 'transmit' of one to the 'receive' of the other, and vice versa. The Raspberry Pi serial port consists of two signals (a 'transmit' signal, TxD and a 'receive' signal RxD) made available on the GPIO header.
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