Panasonic Inverter CN701: Find Sensors to Control Terminals 1-3

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I have a Panasonic inverter, I understand it needs some sort of input to, CN701, three terminals numbered 1-2 & 3.

On the diagram DPC-CN701 shows 2-3v on 1 & 3 & 0v on 2.

Where can I get the sensors to control these points, I have been told that terminal 1 switches on the unit after initial warm up, can I use a different input?

Thanks hopefully

Diagram attached
 
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Tony Simpson said:
I have a Panasonic inverter, I understand it needs some sort of input to, CN701, three terminals numbered 1-2 & 3.

On the diagram DPC-CN701 shows 2-3v on 1 & 3 & 0v on 2.

Where can I get the sensors to control these points, I have been told that terminal 1 switches on the unit after initial warm up, can I use a different input?

Thanks hopefully

Diagram attached

Those are the "data" connections to the control panel. It's not clear how sophisticated it is - actual data back and forth with some type of microcontroller or just some type of PWM back and forth.