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doc: document RDM support

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King Kévin 2023-12-19 15:23:43 +01:00
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README.md
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@ -1,13 +1,35 @@
This is the DMX splitter for WLED chain.
This is the RDM splitter for WLED chain.
purpose
=======
WLED chain devices can be inter-connector using Ethernet cables.
They can carry data signal and power.
The DMX splitter allows injecting DMX512 data signal from regular XLR cable, and power from external power supplies.
The RDM splitter allows injecting DMX512 data signal from regular XLR cable, and power from external power supplies.
The WLED chain is electrically isolated from the XLR chain.
RDM
---
DMX allows a controller to send data to devices.
RDM is an extension to that, allowing the devices to reply back to requests.
Using RDM, you can:
- get device name
- get device information
- set device address
- ...
Now devices can be configured remotely, and no ladder is require anymore.
The RDM splitter is actually a DMX splitter with RDM support.
If you don't need RDM, just don't place the MCU (and passives next to it).
The board will still work as DMX splitter.
The WLED chain hardware is RDM capable.
Software support needs to be added.
For now you still have to use the web interface to configure it.
usage
=====
@ -26,7 +48,7 @@ properties
The XLR chain and WLED chain circuits are electrically isolated.
The DMX splitter board needs to be powered to operate.
The RDM splitter board needs to be powered to operate.
The DMX512 data will then be copied from the XLR chain to the RJ45 port for WLED chain.
The power can come from the 2.1/5.5 barrel jack (marked VIN), the spring terminals (the two terminals next to VIN), or from the WLED chain through the RJ45 port or corresponding terminal.
@ -45,8 +67,9 @@ Take this into account when reusing this power rails from the WLED chain.
The yellow LED on the RJ45 port lights on when power is available on VIN.
The green LED on the RJ45 port light on when the electronic on the board is powered, using the on-board DC to DC buck regulator to 5V.
The optional green LED on the center of the board blinks upon DMX512 traffic from the XLR port to RJ45.
The optional red LED on the center of the board blinks upon DMX512 traffic from the RJ45 port to XLR, but this should never happen (it's only for custom mods).
The blue LED on the center of the board blinks upon DMX512 traffic from the XLR port to RJ45.
The red LED on the center of the board blinks upon RDM traffic from the RJ45 port to XLR.
The green LED in the corner of the board turns on when RDM support is active.
The board can be mounted in waterproof enclosures (for [sonoff](https://www.sonoffegypt.com/products/sonoff-ip66-waterproof-case) or generic [100x68x50 mm](https://www.aliexpress.com/item/1005005622148025.html)).
You can drill holes on the side of the box to get access to the XLR and barrel port.
@ -54,8 +77,3 @@ This will not be waterproof anymore though.
Instead, you can put the corresponding cables through waterproof glands (not large enough for connectors), and connect the individual wires to the spring terminals (mark VIN, DMX IN, and DMX OUT).
Similarly, there are string terminal for the RJ45 wires.
The terminals match the 8P8C pin numbers, and the wire colors are indicated in the bottom.
limitations
===========
The DMX splitter is not RDM compatible.