I'm not sure what you mean: ASCII text encoding is full of controls characters, most of them being only historical and not used by anything, including terminals.
ASCII, an ANSI code, includes the concept "information interchange" in the name, i.e. it is also a communication protocol, and also a terminal device control, inasmuch as it is also a character set. That's why OP was making a mistake claiming that "BEL" doesn't belong in there.
ANSI's escape sequences came later to control more functions for glass teletypes.