# EMS controller installation

> Install the Voltmasters EMS controller on a DIN rail: the 24V power wiring per wire colour, the ground and the network connection.

Source: https://voltmasters.io/en/docs/getting-started/ems-controller-installation/

When installing the controller, clip it onto a DIN rail and connect it as shown below.

![The EMS controller, a RevPi Core SE, seen from the front with its status LEDs, network port, MAC address label and the 24V terminal wired in orange, white and green-yellow.](https://voltmasters.io/assets/docs/image-20.webp)

### Power and network connections

| Color | Location | Type |
| --- | --- | --- |
| Orange | Left | +24V |
| White | Middle | −24V |
| Green-Yellow | Right | Ground ⏚ |
| Network cable | Top | Network cable |

You can use a 24-volt power supply or look for a compatible power cable.

> **Note**
>
> To communicate with the devices, the controller must be connected to the internet. All devices to be paired must also be connected to the same network.

![The same controller with the network cable plugged into the port on top and the power and ground wires in the terminal below.](https://voltmasters.io/assets/docs/image-21.webp)

[Hardware datasheet](https://revolutionpi.com/fileadmin/downloads/datasheets/Technical_Datasheet_RevPi-Core-all.pdf)