> For the complete documentation index, see [llms.txt](https://wecon.gitbook.io/pistudio-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wecon.gitbook.io/pistudio-manual/11.-plc-protocols/modbus-rtu-master.md).

# 11.13 MODBUS RTU Master

Supported Series: MODBUS RTU CONTROLLER

HMI works as MODBUS SLAVE connecting with MASTER

**HMI settings**

| **Items**   | **Settings**      | **Note** |
| ----------- | ----------------- | -------- |
| Protocol    | MODBUS RTU Master |          |
| Connection  | RS485/RS232       |          |
| Baud rate   | 2400\~187500      |          |
| Data bit    | 8                 |          |
| Parity      | Even/ Odd/ None   |          |
| Stop bit    | 1/2               |          |
| Station No. | 0\~255            |          |

**Address list**

| **Type** | **HMI address**       | **MODBUS code** | **Range** |
| -------- | --------------------- | --------------- | --------- |
| Bit      | HDX3000.0\~HDX3499.15 | 0               | 0\~7999   |
| Word     | HDW3500\~HDW7999      | 4               | 0\~4499   |

**Cable wiring**

**1) RS485**

![](https://3950998874-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lup_3URExwDkfqKABSb%2F-M3KYt3KQdSoNd6YsdXk%2F-M3KYzPzFJrpeF7SshJ2%2Fimage.png?alt=media\&token=3940549d-9cbf-424e-bb42-cf5dccf9c9fe)

![](https://3950998874-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lup_3URExwDkfqKABSb%2F-M3KYt3KQdSoNd6YsdXk%2F-M3KZ1IhHWy-1kxhc4Rh%2Fimage.png?alt=media\&token=53353563-532d-467b-9890-a26a71e84bf0)

**2) RS232**

![](https://3950998874-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lup_3URExwDkfqKABSb%2F-M3KYt3KQdSoNd6YsdXk%2F-M3KZ4NcIKml7AMRkaj2%2Fimage.png?alt=media\&token=f98ef110-e13e-4974-a6f3-697d2380c2c9)

{% hint style="info" %}
✎**Note:**

COM3 is available in PI8000 series and advanced series.
{% endhint %}