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Document modbus broadcast #6915

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4 changes: 4 additions & 0 deletions src/content/docs/components/modbus_server.mdx
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Expand Up @@ -13,6 +13,10 @@ The `modbus_server` component creates a RS485 connection to let your ESPHome nod

You must set the `role` attribute of the [Modbus](/components/modbus/) to `server`.

> [!NOTE]
> Modbus broadcast writes use address `0`. They are delivered to every registered server device on the same hub and
> do not send a response. Only write function codes `0x06` and `0x10` are treated as broadcasts.
Comment on lines +16 to +18

<Image src="/images/modbus.png" width={190} height={200} layout="constrained" alt="" />

## Hardware setup
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