---
title: Reactor Redstone Port
id: oritech:reactor_redstone_port
type: block
---

A redstone signal to a redstone port will disable the intake of new fuels.

Any fuel pellet that has already started burning needs to be finished before the reactor will fully shut off
with a redstone signal to a port.

The port can also be used with a comparator to output data. It has 3 modes:

*   **Temperature**: Outputs signal based on the hottest component temperature (relative to the maximum reactor heat)
*   **Active Rod Count**: Indicates the number of rods burning fuel (for example, the actual number of rods per layer that are currently active. Double and quad rods are counted as one.)
*   **Energy**: Measures current RF stored

To cycle between the modes, simply right-click the port.

For detailed information on reactor mechanics, see the [nuclear reactor guide]($reactor/introduction).