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[timmeh]

Is there any way to rig a pressure plate to close one door and open another? 

I had this sick twisted idea for my next elvish PoWs, in which I stick them in a big circle with four doors they can exit through.  All but one is closed so they run towards the open one.  On the way they step on a pressure plate that closes the open door and opens the next one in the circle.  This continues till they go insane and die, at which point I retrieve their armor for selling, their weapons for sparring, bones for arrows and leave the blood and body parts there as decoration.  Then I just stick the next elf in and repeat.

Unfortunately, this obviously won't work if I can't have a pressure plate open one door and close another.

[AncientEnemy]

you can only do this with complex setups using water and multiple pressure plates. plates don't send 'toggle' messages, they send an ON and an OFF message depending on the state they are in. each thing you can hook up to a plate only reacts one way to a given message. an ON message opens a door, or does nothing if it's already open. so multiple objects linked to the same lever or plate will just end up in the same position.

[mjo625]

I like it.  I hope you have a renewable water source, as you'll need it.

Each pressure plate in the cell is connected to one screw pump and 3 hatch covers elsewhere. The screw pump pumps water on to a pressure plate which opens a different door, and the hatch covers open to drain water from a pressure plate that's keeping the current door open.

I was going to draw an ascii diagram, but I was having a really hard time with it(edit which is when I got post ninja'ed). Hopefully you understand what I mean.

[timmeh]

I like it.  I hope you have a renewable water source, as you'll need it.

Each pressure plate in the cell is connected to one screw pump and 3 hatch covers elsewhere. The screw pump pumps water on to a pressure plate which opens a different door, and the hatch covers open to drain water from a pressure plate that's keeping the current door open.

I was going to draw an ascii diagram, but I was having a really hard time with it(edit which is when I got post ninja'ed). Hopefully you understand what I mean.

I had a similar thought process just now, although mine involved floodgates along the brook instead of pumps, but I think I like your idea better, as it'll be easier to set up.  None the less, he is my diagram, although it's more of a drawing, and a crappy paint one at that, but it might be clear enough to see what I'm thinking...

Spoiler: Click for "diagram". (click to show/hide)

Basically the same as yours just with floodgates if I'm understanding you correctly.  Actually, would this even work with floodgates?  I think the delay might prevent the doors from opening/closing right...

[mjo625]

Yeah, that's exactly it, except with an extra drainage hatch cover (the 3 in my last post should be a 2). On the left side it would go, from top to bottom, yellow floodgate, blue hatch cover, green pressure plate, blue (hatch cover or flood gate).

Floodgates would actually be better, now that I think of it, what with not requiring power.

[RAM]

bear in mind that some of these complex mechanisms have significant delays, my one-way door requires a pressure plate field about 20 deep to make sure that no perfectly agile dwarves(which seem to have a maximum speed of one tile per 5 frames) manage to race through before it closes. Also be aware of the risk of something connected to pressure plates getting the wrong signals due to signals not having an effect if the target is in the wrong state at the time...

Hmmm, automatic doors, do they make a swooshing sound?
"These are the adventures of the startship Boatmurdered"...

[timmeh]

bear in mind that some of these complex mechanisms have significant delays, my one-way door requires a pressure plate field about 20 deep to make sure that no perfectly agile dwarves(which seem to have a maximum speed of one tile per 5 frames) manage to race through before it closes. Also be aware of the risk of something connected to pressure plates getting the wrong signals due to signals not having an effect if the target is in the wrong state at the time...

Hmmm, automatic doors, do they make a swooshing sound?
"These are the adventures of the startship Boatmurdered"...

I'm not likely to stick dwarves in the torture device, but that should give me a good scale to transfer over to the elves and goblin's speed.  Thanks!

Yeah, that's exactly it, except with an extra drainage hatch cover (the 3 in my last post should be a 2). On the left side it would go, from top to bottom, yellow floodgate, blue hatch cover, green pressure plate, blue (hatch cover or flood gate).

Floodgates would actually be better, now that I think of it, what with not requiring power.

They don't require power, but I'm thinking I'll use doors if it'll still work, cause then I don't have to worry about a delay in the first place.  My design might not work in the next version, but it'll spare me building however many hundred pressure plates I would have to build to prevent a "super-elvishly agile" victim from getting past one of the plates too quick and sneaking through a door and stinking up my fortress with his corpse.

[Mraedis]

Replace doors with floodgates and it works. 

[Variance]

Replace doors with floodgates and it works. 

It works with doors. When a door is activated by a lever, it becomes:
(Passable, pet-passable, open)
Which allows water through. Conversely, it becomes forbidden and not open when the lever is triggered again. Only when doors are not hooked up to levers can they be just "passable, pet passable" like they would be if freshly built.