Arduino RS232 Serial Communication to Laser Control Board

I was just learning about that in Serial input basics (Serial Input Basics - updated - #3 by Robin2).
in the basics they use '\n' or '>' as end markers ('<' as a starter marker, or LF). I was reading through google and ASCII uses the number 13 as Carriage return.

with the terminal emulation software I was only able to send and read commands once I selected a check box with "+CR". I assume the terminal emulation program could now read and send the carriage return characters automaticaly, with me just needing to type "INSTRUCTION".

My question now is, what is the CR character I should use, are they all the same?
It will probably work if I just type 13 as the end marker character right? Since it is the ASCII value for carriage return.
Will '\n' or '\r' work the same?