> For the complete documentation index, see [llms.txt](https://inacks.gitbook.io/inacks-is3720-i2c-dmx+rdm-receiver-ic/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://inacks.gitbook.io/inacks-is3720-i2c-dmx+rdm-receiver-ic/datasheet/memory-map/rdm_online.md).

# RDM\_ONLINE

> This page is not the authoritative source for design information. The official [IS3720 datasheet](https://www.inacks.com/is3720) published on [www.inacks.com](http://www.inacks.com) is the authoritative reference: always consult it for the latest information.

The RDM\_ONLINE register enables or disables the RDM functionality of the IS3720. DMX reception remains active regardless of the value of this register.

By default, the chip powers up with this register set to 0, allowing time to configure the RDM parameters (the UID, manufacturer label, model label, etc.). Once the RDM parameters are configured, the chip can be brought online by writing a 1 to this register.

When this register is set to 1, the UID register cannot be modified. This mechanism prevents accidental UID register modification while your product is operating.

Writing the key value 160 to this register enables a special PID (0x8000), called “Update UID”. Writing to this PID via RDM allows custom UID provisioning.

This register is not associated with any RDM PID. It is 8‑bit register that accepts values 0 and 1. It’s memory type is RAM, and it is reset to 0 at each power‑up.

This is a RAM register. On each power-up, it is set to 0.

* **Name:** RDM\_ONLINE
* **Description:** Enables or disables the RDM functionality of the IC
* **Address:** 631
* **Memory Type:** RAM
* **Default Value:** 0
* **Allowed Values:** 0 or 1
* **Accessible by:** Only I2C (Read/Write)

| Bit 7 to Bit 0 |
| -------------- |
| RDM\_ONLINE    |