# How to implement a timeout on a subflow?
**URL:** https://discourse.nodered.org/t/how-to-implement-a-timeout-on-a-subflow/10980
**Category:** General
**Created:** [10 May 2019 07:46 UTC](https://discourse.nodered.org/t/how-to-implement-a-timeout-on-a-subflow/10980 "2019-05-10T07:46:22Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@naamah75](https://discourse.nodered.org/u/naamah75)
#### Post date: [10 May 2019 07:46 UTC](https://discourse.nodered.org/t/how-to-implement-a-timeout-on-a-subflow/10980/1 "2019-05-10T07:46:22Z")
I would want to write a subflow that implement a modbus-rtu request and the relative reading of the response, but in case of no answer from the mosbus client I need to "exit" from subflow with a timeout output.
I wouldn't wait forever for the client's reply.
How I can do it?
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### Author:  [@knolleary](https://discourse.nodered.org/u/knolleary)
#### Post date: [10 May 2019 07:56 UTC](https://discourse.nodered.org/t/how-to-implement-a-timeout-on-a-subflow/10980/2 "2019-05-10T07:56:32Z")
Hi @naamah75
The Trigger node can be configured to send a message after a period of time unless it has been reset. That can form the starting point for a timeout flow. This recipe in the cookbook gives an example: [https://cookbook.nodered.org/basic/trigger-timeout](https://cookbook.nodered.org/basic/trigger-timeout)
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### Author:  [@naamah75](https://discourse.nodered.org/u/naamah75)
#### Post date: [10 May 2019 09:04 UTC](https://discourse.nodered.org/t/how-to-implement-a-timeout-on-a-subflow/10980/3 "2019-05-10T09:04:43Z")
Trigger node looks a lot better than my implementation...
Thanks!