# Serial Port Disconnection Issues "Input/output error"

**URL:** <https://discourse.nodered.org/t/serial-port-disconnection-issues-input-output-error/15090>\
**Category:** General\
**Created:** [4 September 2019 10:32 UTC](https://discourse.nodered.org/t/serial-port-disconnection-issues-input-output-error/15090 "2019-09-04T10:32:54Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Testing1User](https://avatars.discourse-cdn.com/v4/letter/t/54ee81/32.png) [@Testing1User](https://discourse.nodered.org/u/Testing1User)\
**Post date:** [4 September 2019 10:32 UTC](https://discourse.nodered.org/t/serial-port-disconnection-issues-input-output-error/15090/1 "2019-09-04T10:32:54Z")

</div>

Hi,

I have 4 serial port inputs using the serial in node.  
It works fine most of the time but every now and then I get the following error when I deploy my nodes  
"serial port /dev/ttyUSB0 error: Error: Error: Input/output error, cannot open /dev/ttyUSB0"

Ranges from USB0 to 3 as there are 4 inputs and sometimes multiples of them give this error and redeploying them gets rid of this error.  
Is there any way I can catch this error and redeploy the nodes? it currently only shows up in the debug menu as 'msg: string[90]' and does not show in the status or catch nodes.

Cheers for the help,  
Ash