ESP32 change serial TX pin into three state pin

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Hi All,
I'm new on Arduino ESP32 world and I turn to You as experts for Arduino ESP32 hints.
I'm using ESP32 in kind of Token MODBUS, on logic level, TX , RX lines. Therefore, I need to change TX pins on bus to three state, when not transmiting. I tried all kind of hints to do this, I get not working comm or the trick does no effect. I used to programming Microchips from 12F to DSPICs and PIC32, where this was pretty easy, here I'm struggling a bit using Arduino on ESP, working in Visual Code Platformio IDE. The various methods I used, are listed bellow:

void MODBUSDIS(void)
{

  uart_set_pin((uart_port_t)2, -1, 27, -1,-1);

    //gpio_set_direction((gpio_num_t)26,GPIO_MODE_INPUT);
 //Serial2.begin(4800, SERIAL_8N1, 27, -1);
 // pinMode(26,INPUT);
 // digitalWrite(26, LOW);

 //Serial2.setPins(-1,-1,-1,-1);
}

void MODBUSEN(void)
{
 // gpio_set_direction((gpio_num_t)26,GPIO_MODE_OUTPUT);
  //Serial2.begin(4800, SERIAL_8N1, 27, 26);
  // pinMode(26,OUTPUT);
//    digitalWrite(26, HIGH);
 // Serial2.setPins(-1,-1,-1,-1);
}
Thanks a lot for any useful information,

Regards,
Vojko
2

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