# Modbus Write Issues

**URL:** https://discourse.nodered.org/t/modbus-write-issues/50429
**Category:** General
**Created:** [31 August 2021 09:51 UTC](https://discourse.nodered.org/t/modbus-write-issues/50429 "2021-08-31T09:51:39Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![gjones84](https://avatars.discourse-cdn.com/v4/letter/g/7cd45c/32.png) [@gjones84](https://discourse.nodered.org/u/gjones84)
#### Post date: [31 August 2021 09:51 UTC](https://discourse.nodered.org/t/modbus-write-issues/50429/1 "2021-08-31T09:51:39Z")

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Hi All,

I am currently using the node-red-contrib-modbus node to write a value to my Victron Multiplus 2 Inverter/charger. I am running mode 3 which is my own contol loop using node red. A new value must be written every 60s otherwise the inverter/charger will go into passthru and do nothing.

I keep having random times where my inverter goes into passthru. I cant understand why it can run for days with no issues then stop?

Today it went into passthru at 07:19 (ignore the blue circle). But my flow was still calculating and writing values at this time.

 ![HA Modbus Issue](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/e/be6eb3ca40977ef13099a9f88b9f26980909e61d.jpeg)

I am also reading back the values via modbus and into home assistant for fault finding and I can see the last value was -360. Its like my messages are not reaching the server.

 ![HA Modbus](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/4/b481ab7c38b3d14339a88492c92b8d15b5db75c3.jpeg).

Ive checked the Venus GX and its all up and running. All the services are available and running.

![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/e/e/eeb55626335c82103a8afd14bb3644cc840a590f.png)

The node appears to be configured correctly

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/e/2/e24691fe63429d14656f1de12dd52c7e9a332de6.png)

The way I have to fix this is to go into node red and move any node so it detects a change and Deploy. Then all fires back up and starts working again.

Any idea what I could next to locate this issues?

Thanks

Gareth

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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: [30 October 2021 09:52 UTC](https://discourse.nodered.org/t/modbus-write-issues/50429/2 "2021-10-30T09:52:04Z")

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