# Serial nodes appear to stop working

**URL:** <https://discourse.nodered.org/t/serial-nodes-appear-to-stop-working/32920>\
**Category:** General\
**Created:** [15 September 2020 16:37 UTC](https://discourse.nodered.org/t/serial-nodes-appear-to-stop-working/32920 "2020-09-15T16:37:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dennishvo](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dennishvo/32/2896_2.png) [@dennishvo](https://discourse.nodered.org/u/dennishvo)\
**Post date:** [15 September 2020 16:37 UTC](https://discourse.nodered.org/t/serial-nodes-appear-to-stop-working/32920/1 "2020-09-15T16:37:49Z")

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I have a dozen or so devices in the field that run NR for months on end without a restart. The application makes heavy use of the serial nodes, with several messages per second crossing the wire. I'm running NR 1.0.x with Debian Buster on Raspberry Pi 3B / B+.

I'm starting to see devices that have 3-4 months of uptime lose their ability to communicate over the serial port. This has happened four times, each time on a different device. The symptom is that the device being controlled on the other side of the line no longer responds to commands. There are many possible reasons for this, I realize. However, the cure is simply to reboot the pi (but not the device it is communicating with, notably).

I would love to know the actual cause, but it's difficult to get access to the devices. I have not succeeded in recreating the problem in my own environment. Has anyone else seen this issue with the serial nodes?

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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:** [14 November 2020 16:37 UTC](https://discourse.nodered.org/t/serial-nodes-appear-to-stop-working/32920/2 "2020-11-14T16:37:57Z")

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Closed on 14 November 2020 16:37 UTC

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