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

    Default: 2             Value: 1-253

    Address proposed for the local logical station during
    negotiation. If there is no negotiation, the value of this
    characteristic is the value that is used. If negotiation is
    necessary, the value of this characteristic must be between 2
    and 253. You can modify this characteristic only when the entity
    is disabled.