# Maximum Number of serial connections?

**URL:** <https://discourse.nodered.org/t/maximum-number-of-serial-connections/51586>\
**Category:** General\
**Created:** [27 September 2021 18:54 UTC](https://discourse.nodered.org/t/maximum-number-of-serial-connections/51586 "2021-09-27T18:54:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![MonsieurBricolage](https://avatars.discourse-cdn.com/v4/letter/m/f1d935/32.png) [@MonsieurBricolage](https://discourse.nodered.org/u/MonsieurBricolage)\
**Post date:** [27 September 2021 18:54 UTC](https://discourse.nodered.org/t/maximum-number-of-serial-connections/51586/1 "2021-09-27T18:54:54Z")

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I am trying to connect around 20 Arduinos via USB, interfacing Node-RED through Serial. I will extend the USB 2.0 range through Usb to Ethernet range extenders.

How many Serial USB connections does Node-RED allow? Or is that number limited by the operating System as well?

Cheers  
-Dave

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [27 September 2021 19:12 UTC](https://discourse.nodered.org/t/maximum-number-of-serial-connections/51586/2 "2021-09-27T19:12:37Z")

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Welcome to the forum @MonsieurBricolage

I believe that this is purely an OS issue. You should be able to connect to any configured serial port from node-red.

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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:** [26 November 2021 19:13 UTC](https://discourse.nodered.org/t/maximum-number-of-serial-connections/51586/3 "2021-11-26T19:13:34Z")

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