# Beginner Help Needed: X20CP0484 PLC and X20CS1030 Modbus RTU Configuration

**URL:** <https://community.br-automation.com/t/beginner-help-needed-x20cp0484-plc-and-x20cs1030-modbus-rtu-configuration/11630>\
**Category:** Programming\
**Tags:** automation-studio\
**Created:** [June 17, 2026, 4:41pm UTC](https://community.br-automation.com/t/beginner-help-needed-x20cp0484-plc-and-x20cs1030-modbus-rtu-configuration/11630 "2026-06-17T16:41:21Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Shybur](https://avatars.discourse-cdn.com/v4/letter/s/FF8800/32.png) [@Shybur](https://community.br-automation.com/u/Shybur)\
**Post date:** [June 17, 2026, 4:41pm UTC](https://community.br-automation.com/t/beginner-help-needed-x20cp0484-plc-and-x20cs1030-modbus-rtu-configuration/11630/1 "2026-06-17T16:41:21Z")

</div>

Hello Everyone,

I am a beginner with B&R Automation Studio and currently working with an X20CP0484 PLC and X20CS1030 module.

Could anyone please provide a simple guide for:

- Configuring the X20CS1030 for Modbus RTU communication.
- Basic Structured Text (ST) code for testing Modbus communication.
- Reading and writing Modbus registers.
- Any sample project or documentation for beginners.

Any help or example would be greatly appreciated.

Thank you.

---

<div class="post-metadata">

**Author:** ![valerio.manenti](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/valerio.manenti/32/11712_2.png) [@valerio.manenti](https://community.br-automation.com/u/valerio.manenti)\
**Post date:** [June 17, 2026, 4:57pm UTC](https://community.br-automation.com/t/beginner-help-needed-x20cp0484-plc-and-x20cs1030-modbus-rtu-configuration/11630/2 "2026-06-17T16:57:03Z")

</div>

Hi @Shybur ,  
we have many posts created for Modbus RTU communication on the community.  
I just tried to do this search:

 ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/e/ee8d7c34f7d3ff8e9a6551056eceb9be2716de47.png)

and I have found 34 results:

 ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/c/cf2a8e694a2cb79666cafd69b5c42b1322aca23f.png)

Please review in our Help the official library [DRV\_mbus](https://help.br-automation.com/#/en/6/libraries%2Fdrv_mbus%2Fdrv_mbus.html).  
In the Help you find examples too.

Thanks  
Ciao  
Valerio

---

<div class="post-metadata">

**Author:** ![Shybur](https://avatars.discourse-cdn.com/v4/letter/s/FF8800/32.png) [@Shybur](https://community.br-automation.com/u/Shybur)\
**Post date:** [June 17, 2026, 5:04pm UTC](https://community.br-automation.com/t/beginner-help-needed-x20cp0484-plc-and-x20cs1030-modbus-rtu-configuration/11630/3 "2026-06-17T17:04:09Z")

</div>

Thanks for the feedback sir.

---

<div class="post-metadata">

**Author:** ![kovarj](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/kovarj/32/537_2.png) [@kovarj](https://community.br-automation.com/u/kovarj)\
**Post date:** [June 18, 2026, 7:06am UTC](https://community.br-automation.com/t/beginner-help-needed-x20cp0484-plc-and-x20cs1030-modbus-rtu-configuration/11630/4 "2026-06-18T07:06:37Z")

</div>

It is always good to start with a search; for some terms and topics, there are plenty of discussion and wiki posts. If you struggle in some step, something is not clear, or whatever, feel free to ask here. Good discussion can be started if you provide complete info, so what you are going to achieve, what you have already done, what is working, and what is not working. Principles are always welcomed. The more time you spend explaining your issue, the better answer you get.