// -------------------------------------------------------------
// R+ connect SDA
// R-SCL
// -------------------------------------------------------------
task main() {
      bool Rbutton, Lbutton, Mbutton;
      UseRS485(); // (1) Port S4 configured for RS485
      RS485Enable(); // (2) turn on RS485
      //RS485Uart(HS_BAUD_57600, HS_MODE_DEFAULT); // (3) initialize UART 57600
      RS485Uart(HS_BAUD_115200, HS_MODE_DEFAULT);
      Wait(100);
      TextOut(0, LCD_LINE1, "  NXT <> laptop");
      while (true) {
         if(ButtonPressed(BTNRIGHT, FALSE)){        // if Right Button is pressed
             while(ButtonPressed(BTNRIGHT, FALSE)); // Wait for Button is released
             SendRS485String(" Right "); // then send string
         }
         else if(ButtonPressed(BTNLEFT, FALSE)){
             while(ButtonPressed(BTNLEFT, FALSE));
             SendRS485String(" Left ");
         }
         else if(ButtonPressed(BTNCENTER, FALSE)){
             while(ButtonPressed(BTNCENTER, FALSE));
             SendRS485String(" Center ");
         }
      }
    }