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

    Support: All
    Default: 0.0           Value: PhaseIV address

    Specifies a Phase IV compatible address for communication with
    other Phase IV nodes. The default address, 0.0, indicates that
    no Phase IV compatible address is provided for the node. You can
    modify this characteristic only when the entity is disabled.

    set [node node-id] routing phaseiv address phiv-address

    Example:

    set routing phaseiv address = 4.863