# Node-red-contrib-modbus with RTU 485 device over PI 485 shield the rest of the story

**URL:** <https://discourse.nodered.org/t/node-red-contrib-modbus-with-rtu-485-device-over-pi-485-shield-the-rest-of-the-story/39586>\
**Category:** Industrial\
**Created:** [22 January 2021 23:13 UTC](https://discourse.nodered.org/t/node-red-contrib-modbus-with-rtu-485-device-over-pi-485-shield-the-rest-of-the-story/39586 "2021-01-22T23:13:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mellis](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mellis/32/27014_2.png) [@mellis](https://discourse.nodered.org/u/mellis)\
**Post date:** [22 January 2021 23:13 UTC](https://discourse.nodered.org/t/node-red-contrib-modbus-with-rtu-485-device-over-pi-485-shield-the-rest-of-the-story/39586/1 "2021-01-22T23:13:44Z")

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sorry to create a new thread, but the other one expired.

I ended up finding this modbus adaptor worked best:

> **[Raspberry Pi RS422 RS485 HAT](https://www.hwhardsoft.de/english/projects/rs485-shield/)**
>
> Isolated Raspberry Pi RS422 RS485 HAT with many features for applications like MODBUS and NME0183

I was attempting to connect to a wattnode and finally succeeded with a stable connection. Here is Wattnode: [https://temcocontrols.com/shop/three-phase-power-meter/](https://temcocontrols.com/shop/three-phase-power-meter/)

and here is my flow:  
[https://flows.nodered.org/flow/0c124990674bef5112d0e09d8e8f9d7e](https://flows.nodered.org/flow/0c124990674bef5112d0e09d8e8f9d7e)

Maybe someone else working with Modbus RTU or with Wattnode will find this helpful.

Cheers.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [23 March 2021 23:14 UTC](https://discourse.nodered.org/t/node-red-contrib-modbus-with-rtu-485-device-over-pi-485-shield-the-rest-of-the-story/39586/2 "2021-03-23T23:14:28Z")

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