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

    Default: 25            Value: 10-1000

    Maximum length of time, in milliseconds, to wait for the next
    character to arrive. This characteristic is supported only when
    the characteristic protocol is set to genbyte.