Library /sys$common/syshlp/nclhelp.hlb set, frame (OpenVMS), link, bisync_code  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: EBCDIC        Value: ASCII or EBCDIC

    Character code to be used on the link. This characteristic is
    supported only when the characteristic protocol is set to one of
    the following: bisync, chips, genbyte, or swift. You can modify
    this characteristic only when the entity is disabled.