The status of the device cover or interlock
specified in this conceptual row in the 'xcmHrDevCoverTable'.
* 'true' - this cover/interlock is currently open;
* 'false' - this cover/interlock is currently closed.
Usage: The the Printer MIB combines the choice of
cover versus interlock with the status of open versus closed, in
one object - 'xcmHrDevCover[TypeCover|StatusOpen]' add clarity.