# Modbus in IOT2040

**URL:** <https://discourse.nodered.org/t/modbus-in-iot2040/50560>\
**Category:** Industrial\
**Created:** [3 September 2021 02:14 UTC](https://discourse.nodered.org/t/modbus-in-iot2040/50560 "2021-09-03T02:14:45Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![almostz](https://avatars.discourse-cdn.com/v4/letter/a/c2a13f/32.png) [@almostz](https://discourse.nodered.org/u/almostz)\
**Post date:** [3 September 2021 02:14 UTC](https://discourse.nodered.org/t/modbus-in-iot2040/50560/1 "2021-09-03T02:14:45Z")

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After I config and deploy I have the problem "Lost connection to the server, reconnecting" and then I reboot the IOT2040 after this I cannot reach node-red.In IOT2040 hardware config X30 = RS485 and X31 = RS232 I test by Modbus Poll via USB converter RS485 and connect to X30 pin 1,2. Please help me

 ![21](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/e/f/ef426f7b268e6b572fe0717d1ddd70451519deb5.png)  
 ![22](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/9/5/95f6d510772fdc0f14803d17d0bc6b8eab10eca4.png)

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**Author:** ![almostz](https://avatars.discourse-cdn.com/v4/letter/a/c2a13f/32.png) [@almostz](https://discourse.nodered.org/u/almostz)\
**Post date:** [3 September 2021 05:18 UTC](https://discourse.nodered.org/t/modbus-in-iot2040/50560/2 "2021-09-03T05:18:02Z")

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Help me please

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**Author:** ![FrankAB](https://avatars.discourse-cdn.com/v4/letter/f/ee59a6/32.png) [@FrankAB](https://discourse.nodered.org/u/FrankAB)\
**Post date:** [3 September 2021 17:24 UTC](https://discourse.nodered.org/t/modbus-in-iot2040/50560/3 "2021-09-03T17:24:40Z")

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/dev/ttyS2 is not a USB converter.

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**Author:** ![almostz](https://avatars.discourse-cdn.com/v4/letter/a/c2a13f/32.png) [@almostz](https://discourse.nodered.org/u/almostz)\
**Post date:** [4 September 2021 04:18 UTC](https://discourse.nodered.org/t/modbus-in-iot2040/50560/4 "2021-09-04T04:18:10Z")

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USB Converter is using on my PC and dev/ttyS2 I using on IOT2040 on X30

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**Author:** ![iiot2k](https://avatars.discourse-cdn.com/v4/letter/i/8baadc/32.png) [@iiot2k](https://discourse.nodered.org/u/iiot2k)\
**Post date:** [4 September 2021 09:12 UTC](https://discourse.nodered.org/t/modbus-in-iot2040/50560/5 "2021-09-04T09:12:24Z")

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Please write in Siemens IOT2000 forum. IOT2040 isn't easy to handle.

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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:** [3 November 2021 09:12 UTC](https://discourse.nodered.org/t/modbus-in-iot2040/50560/6 "2021-11-03T09:12:47Z")

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