Library /sys$common/syshlp/dbg$help.hlb DEBUG, Messages, MONVALTRUNC  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 monitor value truncated to 256 characters.

    Facility: DEBUG, VMS Debugger

    Explanation: The monitor view displays a maximum of 256 character
    values.

    User Action: You may monitor specific character ranges or monitor
    the value in hex.