# Multiple Modbus RTU Slaves causes error

**URL:** https://discourse.nodered.org/t/multiple-modbus-rtu-slaves-causes-error/18783
**Category:** Industrial
**Created:** [4 December 2019 10:12 UTC](https://discourse.nodered.org/t/multiple-modbus-rtu-slaves-causes-error/18783 "2019-12-04T10:12:21Z")
**Posts on this page:** 1
**Showing post:** 8

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### Author: ![joearkay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/joearkay/32/1442_2.png) [@joearkay](https://discourse.nodered.org/u/joearkay)
#### Post date: [5 December 2019 09:31 UTC](https://discourse.nodered.org/t/multiple-modbus-rtu-slaves-causes-error/18783/8 "2019-12-05T09:31:45Z")

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Hi @bianco-royal - awesome to hear from you 🙂 I'm just working my way through the codebase. I'm not a native javascript developer so it's not second nature to me, so may struggle to improve. It looks like there's a need to initialise and queue based on the server being used, opposed to the slave address of each modbus device.

I am definitely able to test. I have a test rig setup with 2 modbus slaves, but also have a larger remote setup with 10 slaves, all on a single serial port.

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_[View the full topic](https://discourse.nodered.org/t/multiple-modbus-rtu-slaves-causes-error/18783)._