| 摘要 |
A keying apparatus is provided including a key support structure having a plurality of protrusions which mate with a corresponding plurality of recesses formed in an edge surface of a printed wiring assembly. The key support structure includes a mechanism for permanently latching the key support structure at a predetermined location on a mounting rail adjacent a backplane interconnect. The printed wiring assembly is conveniently removable from the key support structure. This keying apparatus assures that when a printed wiring assembly is removed from the key support structure at a predetermined location on the rail, only the proper printed wiring assembly may be reinserted at that location.
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