> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/products/integrations/third-party-readers/salto/overview/salto-cu42e0-controller.md).

# CU42E0 controller

Understand CU42E0 controller functions and configure its network address.

The CU42E0 is the Salto master door controller (2 onboard doors, plus an auxiliary CU42E0/CU4EB8 for lift, floor, and alarm).

![CU42E0 controller board layout: 12V input, BUS485, TAMPER, READER 1/2, RL1-4, Ethernet, CLR button](https://328339335-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6bM8WhlBE9BYizPWJaPN%2Fuploads%2Fgit-blob-d5adceea9e416ca765101e3371278e44182e17af%2FSECHUB-SALTO-05-cu42e0-board-layout.png?alt=media)

### Addressing

To manually address the CU42E0:

1. Press **CLR** to detect readers.
2. The CU42E0 is DHCP-ready. If DHCP is not available, set a static IP via a browser.
3. Press **CLR for 5 seconds** for addressing mode (the LED blinks orange).
4. Browse to **`192.168.0.234`**, set the network parameters, then **Send**.

Use SALTO ProAccess to detect the device. The device must be in **tamper** to configure it.


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