# Serial Port issue

**URL:** <https://discourse.nodered.org/t/serial-port-issue/20763>\
**Category:** General\
**Created:** [23 January 2020 09:42 UTC](https://discourse.nodered.org/t/serial-port-issue/20763 "2020-01-23T09:42:06Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Satyamkc](https://avatars.discourse-cdn.com/v4/letter/s/b782af/32.png) [@Satyamkc](https://discourse.nodered.org/u/Satyamkc)\
**Post date:** [23 January 2020 09:42 UTC](https://discourse.nodered.org/t/serial-port-issue/20763/1 "2020-01-23T09:42:06Z")

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Hi there..  
I am trying to use two different arduino on two different ports. When ever i change the port number of the one node, node-red assigns the same port number to different node. This is very frustrating. I've used everything to solve but nothing worked.  
Please help.  
TIA

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**Author:** ![Lavio](https://avatars.discourse-cdn.com/v4/letter/l/d6d6ee/32.png) [@Lavio](https://discourse.nodered.org/u/Lavio)\
**Post date:** [23 January 2020 09:51 UTC](https://discourse.nodered.org/t/serial-port-issue/20763/2 "2020-01-23T09:51:41Z")

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you have the arduino in the same group on the node-red?

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**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [23 January 2020 10:01 UTC](https://discourse.nodered.org/t/serial-port-issue/20763/3 "2020-01-23T10:01:24Z")

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On the port. Rather than use the pencil edit button, use the drop down and add new port to one of them.

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**Author:** ![Satyamkc](https://avatars.discourse-cdn.com/v4/letter/s/b782af/32.png) [@Satyamkc](https://discourse.nodered.org/u/Satyamkc)\
**Post date:** [6 February 2020 11:41 UTC](https://discourse.nodered.org/t/serial-port-issue/20763/4 "2020-02-06T11:41:23Z")

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No, I'm using different arduino in different flows.

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**Author:** ![Satyamkc](https://avatars.discourse-cdn.com/v4/letter/s/b782af/32.png) [@Satyamkc](https://discourse.nodered.org/u/Satyamkc)\
**Post date:** [6 February 2020 11:42 UTC](https://discourse.nodered.org/t/serial-port-issue/20763/5 "2020-02-06T11:42:25Z")

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I've tried that too, but nothing worked. ☹

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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:** [6 February 2020 15:59 UTC](https://discourse.nodered.org/t/serial-port-issue/20763/6 "2020-02-06T15:59:20Z")

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Please construct a mini-flow showing the failing use of two ports and post it here so we can try to replicate the situation. See [this post](https://discourse.nodered.org/t/how-to-share-code-or-flow-json/506) for how to share a flow.