Hello, I want to use the TX1RX1 of the Arduino Mega, what should I do?

[cofop875]

I want to use the TX1RX1 of the Arduino Mega, what should I do?

[cofop875]

This is my code, I want to use TX0 RX0 and TX1 RX1, both in one code
How should I do?

#include <Modbusino.h>
ModbusinoSlave modbusino_slave(1);
uint16_t tab_reg[10];
void setup() {

modbusino_slave.setup(115200);

}

void loop() {

tab_reg[0] = 0x1234;

modbusino_slave.loop(tab_reg, 10);

}