# \[APP\]\[Pro\] Modbus - Connect every Modbus devices

**URL:** <https://community.homey.app/t/app-pro-modbus-connect-every-modbus-devices/104497>\
**Category:** Apps\
**Tags:** app, homey-pro, advancedflow\
**Created:** [February 20, 2024, 7:13pm UTC](https://community.homey.app/t/app-pro-modbus-connect-every-modbus-devices/104497 "2024-02-20T19:13:05Z")\
**Posts on this page:** 1\
**Showing post:** 545

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**Author:** ![MdJ](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/mdj/32/16541_2.png) [@MdJ](https://community.homey.app/u/MdJ)\
**Post date:** [February 25, 2026, 11:09am UTC](https://community.homey.app/t/app-pro-modbus-connect-every-modbus-devices/104497/545 "2026-02-25T11:09:34Z")

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Hello,

I did a migration from Homey Pro early 2019 to Homey Pro 2026. In my old homey i send data to modbus holding registers with a flow card. (write holding registers) that worked fine. In my new homey this flow stil works, but when i want to add another flow to send a value i cant choose the action “write holding register” anymore ?? only 3 options available as action ??

How can i fix this without deleting all working modbus flowcards ?

 ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/5/d/5da23120b3710dd71cc97f015acc8ff3ede112f8.png)

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