Sending an 11 element array of ints out through the serial port

When the for loop is done, send Serial.print('/0'); or a simple period ('.') .

The NULL is '\0', and that won't send a NULL, anyway. The NULL is a stop sign. It tells that print() method that it is to stop sending data in the string. The stop sign is never sent.

You would be right if it was:

Serial.print ("\0");

But not for:

Serial.print ('\0');

I had to confirm that with my logic analyzer because you don't see anything on the serial monitor.

void setup ()
  Serial.begin (115200);
  Serial.println ();
  }  // end of setup

void loop ()
  Serial.print ('\0');
  delay (500);  
  }  // end of loop

I saw the D1 line go low every 0.5 seconds for 76.625 µS which would be about right (9 * 1/115200 = 78.125 µS). Note that the baud rate generator does not get the baud rate exactly right (it is 2.1% out at that speed).