# W11 Modbus program

**URL:** <https://forum.core-electronics.com.au/t/w11-modbus-program/24286>\
**Category:** Support\
**Created:** [14 June 2026 05:58 UTC](https://forum.core-electronics.com.au/t/w11-modbus-program/24286 "2026-06-14T05:58:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Mark285907](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Mark285907](https://forum.core-electronics.com.au/u/Mark285907)\
**Post date:** [14 June 2026 05:58 UTC](https://forum.core-electronics.com.au/t/w11-modbus-program/24286/1 "2026-06-14T05:58:15Z")

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Hi all.

I’ve got a new-ish Sofar Inverter that has an unused RS485 connection. I’d like to get Modbus data from the inverter into HA but before I do that project I’d like to confirm that the inverter will spit out the Modbus data. The manual is very vague about this.

I’ll get a USB to RS485 dongle but I’m after recommendation of some Modbus freeware I can run on a laptop to prove the data is available.

Recommendations anyone?

Cheers,

Mark

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**Author:** ![Matt217152](https://avatars.discourse-cdn.com/v4/letter/m/8797f3/32.png) [@Matt217152](https://forum.core-electronics.com.au/u/Matt217152)\
**Post date:** [14 June 2026 23:58 UTC](https://forum.core-electronics.com.au/t/w11-modbus-program/24286/2 "2026-06-14T23:58:02Z")

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Hi Mark, I use [modbustools.com](http://modbustools.com) It is a 30 day trail that should get enough testing done in that time. I used it for my sungrow inverter for the same reason you want to do.

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**Author:** ![Mark285907](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Mark285907](https://forum.core-electronics.com.au/u/Mark285907)\
**Post date:** [15 June 2026 00:58 UTC](https://forum.core-electronics.com.au/t/w11-modbus-program/24286/3 "2026-06-15T00:58:19Z")

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Thanks Matt

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**Author:** ![Mark285907](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Mark285907](https://forum.core-electronics.com.au/u/Mark285907)\
**Post date:** [18 October 2026 02:01 UTC](https://forum.core-electronics.com.au/t/w11-modbus-program/24286/4 "2026-10-18T02:01:50Z")

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In the end I didn’t need to physically connect to the inverter and use Modbus. Turns out its wi-fi dongle is actually a data logger so having got the manual and the registers, it was pretty straight forward to get the data.