Arduino Reference - SoftwareSerialConstructor

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SoftwareSerial(rxPin, txPin)

A call to SoftwareSerial(rxPin, txPin) creates a new SoftwareSerial object, whose name you need to provide as in the example below.

You need to call SoftwareSerial.begin() to enable communication.

rxPin: the pin on which to receive serial data

txPin: the pin on which to transmit serial data

#define rxPin 2
#define txPin 3

// set up a new serial port
SoftwareSerial mySerial = SoftwareSerial(rxPin, txPin);