VMS Help SET, PRINTER, Qualifiers, /PASSALL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /PASSALL
       /NOPASSALL (default)

    Controls whether the system interprets special characters or
    passes them as 8-bit binary data.

    If you specify the /PASSALL qualifier, the printer driver does
    not expand tab characters to spaces, fill carriage return or line
    feed characters, or recognize control characters.