# Query several Modbus meter by RS485 RTU

**URL:** <https://discourse.nodered.org/t/query-several-modbus-meter-by-rs485-rtu/46478>\
**Category:** General\
**Created:** [30 May 2021 21:23 UTC](https://discourse.nodered.org/t/query-several-modbus-meter-by-rs485-rtu/46478 "2021-05-30T21:23:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Becker](https://avatars.discourse-cdn.com/v4/letter/b/c77e96/32.png) [@Becker](https://discourse.nodered.org/u/Becker)\
**Post date:** [30 May 2021 21:23 UTC](https://discourse.nodered.org/t/query-several-modbus-meter-by-rs485-rtu/46478/1 "2021-05-30T21:23:32Z")

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Hi,  
is it possible to query 2-16 Modbus meter (SDM630 Modbus V2) in Node-Red without a TCP Gateway?

instead of the gateway:

 ![grafik](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/8/d/8d1d7821e6bf1a16f44c26e33f75519d5d84b633.png)

I would use a RS485 Hat like this:

> **[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

but I am not sure if it is possible to query 2-16 meters.

I don´t have them yet, just want to ask generelly.

in the manual of the TCP gateway it says that it takes one second per meter = 16s for 16 meters.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [29 July 2021 21:24 UTC](https://discourse.nodered.org/t/query-several-modbus-meter-by-rs485-rtu/46478/2 "2021-07-29T21:24:22Z")

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