I'm not exactly sure what you mean but the way I initially wired my Opus is: Accessory wire (switched 12V) on one terminal of the switch (SPST) and the Opus IGN wire on the other terminal. When the switch is closed, my Opus turns on (after a short delay) when the key is in the Accessory or Run position and turns off automatically when the key is in the OFF position. When the switch is open, the Opus stays off regardless of the key position.Originally Posted by XMen
I discovered that the Opus 150W will supply +5VSB as long as +12V power is applied, even if the IGN wire is disconnected. According to Opus, this is in line with ATX specs and is needed to support WOL and WOR on the m/b(makes sense since the modem or NIC needs some power to maintain WOL or WOR circuitry). On many m/b, any device connected to the USB ports will remain powered if +5VSB is on which may or may not suit your needs. I didn't need or want any USB devices using up juice so I added an additional shutdown controller before the Opus to cut power to it 2 minutes after I turn off the switch or put the key into OFF position. It would have been nice if the Opus had a jumper that allowed us to switch off +5VSB totally and eliminate the need for an external shutdown controller.