# Setting Showstopper Node ID

We now need to make an important distinction here. The IP Address is not the identifier for the E-Stop Button on the Showstopper 4 Base.

{% hint style="success" %}
The identifier for the E-Stop Button is called the E-Stop ID (Node). Each Showstopper 4 device needs a unique E-Stop ID from 0-127.
{% endhint %}

This means the maximum number of addressable E-Stop buttons in any system is 128.

To set your E-Stop ID on your [Showstopper 4 Base](https://docs.creativeconners.com/docs/showstopper/showstopper-base):

* **Press** the **knob** to open the Showstopper configuration menu.
* **Turn** the **knob** clockwise until the screen displays >**SET BUTTON ID**. **Press** the **knob** and the **SET E-STOP ID** screen will be displayed (below):\
  ![](https://lh3.googleusercontent.com/v-WX5AzvbBfiigN5AjX1p1QTXy5vSJHw1d7elb1yfYSU8cQUbIvU4_x6ECVTWghRQN1tSAucAHKg8cKR2joc1Q17FWusUULT3El3vKor7lnZzluFVIE9qQxksAWyozX6KzyJCOb6=s0)
* **Turn** the **knob** and scroll the cursor to highlight the NEW ID number and press the knob to select the field.
* **Turn** the **knob** to set the **new ID** and **press** the **knob** again to accept the new value.
* **Scroll** the cursor over to the **OK** and **press** the **knob** to **set** the new E-Stop ID, and return to the primary screen display.

{% hint style="warning" %}
If you want to cancel the changes you made to the E-Stop ID, scroll the cursor over to the CANCEL and press the knob
{% endhint %}