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[Polar_Atom]

I don't suppose there's anyway to have a lever work both ways. What I mean is, as one thing closes, another opens via pulling a lever?

[rephikul]

I don't suppose there's anyway to have a lever work both ways. What I mean is, as one thing closes, another opens via pulling a lever?

you can do that. Link the lever to the first thing, then pull it. Now link the lever to the second thing. You now have a lever linking to 2 things of different state and one will open as the other close.

[rarborman]

Just like in reality levers are both on and off at the same time...just be careful about how many things you connect to a single lever, it increases the lag caused by pulling it.

[Polar_Atom]

Bloody Good. Cheers.

Now I can seal a door, whilst simultaneously releasing magma. I'm sure I'll never need to use such a device.

.... -.-

[ZetaX]

No, it's not true what rephikul said. This will not work for most things. The lever doesn't send a toggle signal (in most cases; gear assemblies should be an exception [haven't tested for some versions]), but a "close" or "open" signal (which is ignored if the object in question is already in that state).

You have two options:
- The easy solution is to use a raising drawbridge A and either a floodgate, retracting bridge or door B. Now the "open" signal opens B, but raises A, so A get's impassable (including fluids), and conversely the "close" signal closes B, but lowers A, making it passable again.
- The hard er but more general solution is to build an inverter using water or animal logic (which works for all kind of uses) or mechanical logic (which only works for some settings, as it cannot trigger pressure plates and thereby sending an arbitrary signal itself).

[blue emu]

My first thought was a fluid-logic inverter, yes.

Hook the lever directly to object #1. Also hook it to a floor-hatch which will drain water off of a pressure-plate connected to object #2. The combination of lever/floor hatch/water/pressure plate will invert the activation/deactivation signal.

[rephikul]

No, it's not true what rephikul said. This will not work for most things. The lever doesn't send a toggle signal (in most cases; gear assemblies should be an exception [haven't tested for some versions]), but a "close" or "open" signal (which is ignored if the object in question is already in that state).

Then I must admit not everythings behave the same way because I've been using this to open and close 2 different bridges at the same time.

[ZetaX]

Are those bridges of the same "type" (both raising or both retracting)¿

[rephikul]

Are those bridges of the same "type" (both raising or both retracting)¿

ya they are both rasing and both made of the same material, size and direction.

[ZetaX]

Strange; maybe that changed recently. But then again, it seems to not have changed for floodgates...
I will test that later on, now I've to oversee an exam^^

[Shambling Zombie]

Last time I tried to have one lever open one floodgate and close another, all my dwarfs suddenly found themselves drowning in my dining hall.

I think it might have been an accident. 

[Sphalerite]

No, you can't do this.  Levers send an 'open' signal when moved to one position, and a 'close' signal when moved to the other position.  When a bridge, door, floodgate, or other device with open/close positions gets a signal which matches its current state, nothing happens.  If you link a lever to a thing, pull it, then link it to another thing and pull it a few more times, both things will end up in the same state, regardless of what state they were in when linked to the lever.

Then I must admit not everythings behave the same way because I've been using this to open and close 2 different bridges at the same time.

Upload a save.  Bridges and lever have never worked this way, ever.

[Darvi]

One could link a not-gate to the second building, though.

[thegoatgod_pan]

There is a way to invert it, and no water required--have two bridges on raise (one can be on retract)--one bridge covers an x-y axis entrance, the other covers a z-level entrance--thus when the bridge are deployed, one entrance is covered, one revealed and the lever pull reverses this--bridge goes up, shutting down the x-y entrance, other bridge goes up, revealing z-level entrance

[ZetaX]

That's just what I suggested above, but your's restricted to one of them being Z-level. The one mentioned earlier works fine for both being x-level (or y).