Doors: Open and Lock

The storage door is open again. Somebody opened it and walked on, and now the warm air drifts into the cold corridor. A chip closes it reliably – and, if needed, does not let it open in the first place.

A door's LogicTypes#

Composite door, glass door, interior doors and airlock door share the same important values:

sbn DOOR HASH("Lagertuer") Open 1    # open
sbn DOOR HASH("Lagertuer") Lock 1    # lock manual operation

Reading the state back#

Somebody can also open a door by hand. So a good controller does not write blindly but first reads how the door stands right now:

lbn open DOOR HASH("Lagertuer") Open Average

Now the chip knows whether the door is open – whether it opened it itself or a fellow player did.

Closing after a while#

No sleep: the chip should keep reading buttons in the meantime. A counter runs while the door is open and is reset as soon as it is closed:

select time open time 0      # door closed: counter to 0
add time time open           # door open: one more tick
sge tmp time TIME            # time up?
seqz tmp tmp
and open open tmp            # then close

With define TIME 10 the door stays open for five seconds.

Locking#

Lock keeps players out – or in. A locked door cannot be opened by hand from either side. So only lock when real danger waits behind it, and release the door as soon as it is over.

A click as a request: Mode 1#

If a door is set to Mode 1 (Logic), a click does not open it. The click only sets Setting: 1 if it is currently closed, 0 if it is open. The chip reads that as a request and decides itself whether it writes Open – for example only once the pressure behind it is right. With Mode 0 (Operate) the click opens and closes as usual.