Javier Huerta: "Why not use a toggle?": Toggle uses a pulse to flip the state of the output line. To address the other suggestions I have read so far. Maybe the easiest solution is to just bring my discrete signals outside. Also, there's a heartbeat oscillator that checks every so often to make sure I catch any front-panel commands so as to keep my feedback in sync with the real world. That leaves only the startup condition.but because this is what I call a "request" line, and because the module provides feedback for this line, I can handle that as part of system initialization. I don't think I need a trigger, because when the signal changes state, that should serve as the trigger. Internally, I have discrete on and off commands but I was hoping to control those commands with a single signal. I'm trying to make my life easier when I build the system. Your AND/NAND solution sounds pretty close, except that I don't have a trigger, so I don't really need the logic. One would give a turn on if the digital input was low and the power "button" was pressed (one input was fed from a NOT gate), and another AND gate sent a power off if the digital input was high and the power button was selected. Two AND gates provided the signal selection. The output is fed to a digital input on the Crestron control unit so we could set up an AND gate with the trigger on one input and the state high or low sense on the digital input. Do you have a trigger pulse anywhere that is supposed to tell the system "I am turning this switch on or off"? We have used the current sense device which outputs either a high or low depending on the state of the connected device which for us was a DVD player. > Just for clarification, the input signal is either on or off, correct? It is like a switch that is in one position or the other and you are trying to send a discrete turn-on, turn-off signal to the controlled device based on that switch's position. Just for clarification, the input signal is either on or off, correct? It is like a switch that is in one position or the other and you are trying to send a discrete turn-on, turn-off signal to the controlled device based on that switch's position.
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