[Gary Dillard]

There are different ways to wire the pneumatics, which determines how you command the spikes, but here's how we do it for the double action solenoid. We run the red from one side and the black from the other side of the valve together, so you have 2 pairs of black/red wires to connect to the spike. You can connect these to either side (+/-); it doesn't really matter because 1) you can always switch the tubing and 2) you are usually just trying to change the state of the cylinder in or out, just click it again and it goes the other way. For a given state (say, extend widget), you will command positive on (1) and negative off (0), which will make the solenoids activate the valve in one direction. For the opposite state (retract widget), command positive off (0) and negative on (1), which makes the solenoids (and the valve) move in the other direction.