I am currently trying to build a circuit that will allow an actuator to be controlled from an HAI OP2 system. The idea is that the OP2 momentary pulse will allow a +ve voltage to go to the actuator (which has built-in limit switches). A second pulse will latch the power feed with reverse polarity, which will send the actuator back in the other direction. Have looked at lots of different circuit diagrams and relays but am still stumped....any takers?