I'm getting " n " in the serial monitor.
I know (n) = (6E) in hex value... but where's the rest? Somethings not right.
What's not right are your expectations.
You are sending 0x6E, 0x00, 0x00, 0x0B as binary data. The serial monitor is expecting ASCII data. The 0x00s and 0x0B are non-printing characters, so your expecting them to print is not realistic.