function onClose() {
  onCommand(COMMAND_COOLANT_OFF);

  //writeBlock(gFormat.format(28), gAbsIncModal.format(91), "Z" + xyzFormat.format(1)); // retract
  //writeBlock(gFormat.format(0), gAbsIncModal.format(91), "Z" + xyzFormat.format(1)); // retract
  zOutput.reset();

  setWorkPlane(new Vector(0, 0, 0)); // reset working plane

  if (!machineConfiguration.hasHomePositionX() && !machineConfiguration.hasHomePositionY()) {
    // 90/91 mode is don't care
    //writeBlock(gFormat.format(28), gAbsIncModal.format(91), "X" + xyzFormat.format(0), "Y" + xyzFormat.format(0)); // return to home
  } else {
    var homeX;
    if (machineConfiguration.hasHomePositionX()) {
      homeX = "X" + xyzFormat.format(machineConfiguration.getHomePositionX());
    }
    var homeY;
    if (machineConfiguration.hasHomePositionY()) {
      homeY = "Y" + xyzFormat.format(machineConfiguration.getHomePositionY());
    }
    //writeBlock(gAbsIncModal.format(90), gFormat.format(53), gMotionModal.format(0), homeX, homeY);
  }

  onImpliedCommand(COMMAND_END);
  onImpliedCommand(COMMAND_STOP_SPINDLE);
  writeBlock(mFormat.format(30)); // stop program, spindle stop, coolant off
  writeln("%");
}