> For the complete documentation index, see [llms.txt](https://inacks.gitbook.io/is4310-wiki/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/is4310-wiki/datasheet/description/modbus-uart-port.md).

# Modbus UART Port

The IS4310 is compatible with any Modbus RTU Serial Interface, including RS485, RS422, RS232, and others, thanks to its UART port. A transceiver matching the serial interface of the field bus (RS485, RS422, RS232, etc.) must be connected to the IS4310 UART port. This transceiver adapts the field bus voltage levels to 3.3V or 5V, ensuring proper operation with the IS4310.

Note: Connecting field buses like RS485 or others directly to the IS4310 will not work and will permanently damage the device.

For example, if the customer application connects to an RS485 field bus, an RS485 transceiver such as the THVD1330 should be used.

<figure><img src="/files/Ez0n2CsUnScNfLmXB3UL" alt="" width="413"><figcaption></figcaption></figure>


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