/PROTOCOL=DDCMP
       /PROTOCOL=NONE (default)

    On VAX, controls whether the terminal port specified is changed
    into an asynchronous DDCMP line. The /PROTOCOL=NONE qualifier
    changes an asynchronous DDCMP line back into a terminal line.
    Note that /PROTOCOL=DDCMP is a permanent characteristic;
    therefore, the /PERMANENT qualifier is not required.