There is no diagram to this meter?
Can you post link to where you bought it so I can possibly find out for you.
I know 2 of the 4 wires would be to power the meter, power\ground.
The other 2 wires should be SENSING power\ground.
I do not believe any of those wires would be remote turn on.
Usually when you have 4 wires, the 2 wires used to power the meter require a DIFFERENT input voltage than what it's designed to measure.
a voltmeter may say measures 10-50vDC, but to power it on it needs 5vDC.