Browse Prior Art Database

Library Doors Interlock Automatic Addressing

IP.com Disclosure Number: IPCOM000117656D
Original Publication Date: 1996-Apr-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Mery, HE: AUTHOR [+2]

Abstract

A method for addressing (sensing) each door in a multi-frame, multi-door Automated Tape Library is disclosed. The sense line for each switch is rotated in the door interlock bus at each of the door interlock switch printed circuit cards.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 75% of the total text.

Library Doors Interlock Automatic Addressing

      A method for addressing (sensing) each door in a multi-frame,
multi-door Automated Tape Library is disclosed.  The sense line for
each switch is rotated in the door interlock bus at each of the door
interlock switch printed circuit cards.

      A tape library system which contains multiple frames, each
having an access door, which when opened must generate an signal
indicating that particular door has been opened.

      A Door Interlock Switch is used to generate the signals for the
invasion detect function in the library controller.  The purpose of
invasion detect function is to determine exactly which door has been
opened.  This information is used by the library controller to
determine which portion of the library inventory may have been
altered.

      The invasion detect switches are wired individually (in
parallel).  An installation may contain up to eight doors, therefore
eight switches are required.  The number of doors may vary from one
to eight and they may be installed in any sequence.  All hardware
must be the same in each frame because any given frame can be
installed in any position in the string (positions 1-8).

      The design of a universal printed circuit board, a card
containing an invasion detect switch, that can be wired in a uniform
manner regardless of the door position in a string of doors and can
be interconnected with a common cable between cards.

      The addres...