Here are the details about Remote Port Operation of M6000L-48SP & M12000L-48SP Inverters
The remote port accept RJ11 (Registered Jack-11) connector, the same one used on telephone cables.
Here is the pinout of the remote control
Connects SW1 with SW2, the inverter goes to Power Saver Mode.
Connects SW2 with SW3, the inverter goes to Power Saver Off Mode.
Users can set up the RJ11 connector and use a rocker type switch to control the inverter.