# Modbus read not connect

**URL:** <https://discourse.nodered.org/t/modbus-read-not-connect/87697>\
**Category:** General\
**Tags:** function-node\
**Created:** [4 May 2024 04:20 UTC](https://discourse.nodered.org/t/modbus-read-not-connect/87697 "2024-05-04T04:20:45Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ThaiMinh120](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/thaiminh120/32/90099_2.png) [@ThaiMinh120](https://discourse.nodered.org/u/ThaiMinh120)\
**Post date:** [4 May 2024 04:20 UTC](https://discourse.nodered.org/t/modbus-read-not-connect/87697/1 "2024-05-04T04:20:45Z")

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![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/2/e/2ef97bd593b1b31a30c31ae08a7c2c335cb4ceb3.png)  
I connect from DDC to IOT2050 by RS485 to COM. Help me.

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**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [4 May 2024 07:15 UTC](https://discourse.nodered.org/t/modbus-read-not-connect/87697/2 "2024-05-04T07:15:15Z")

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Hi. It is quite literally impossible to give you any specific help with so little information. But I will try:

- Check the cables
- Check the parameters

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**Author:** ![smanjunath211](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/smanjunath211/32/95742_2.png) [@smanjunath211](https://discourse.nodered.org/u/smanjunath211)\
**Post date:** [4 May 2024 10:19 UTC](https://discourse.nodered.org/t/modbus-read-not-connect/87697/3 "2024-05-04T10:19:02Z")

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show how modbus read node is configured

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**Author:** ![benefit\_union](https://avatars.discourse-cdn.com/v4/letter/b/ba9def/32.png) [@benefit\_union](https://discourse.nodered.org/u/benefit_union)\
**Post date:** [5 May 2024 16:10 UTC](https://discourse.nodered.org/t/modbus-read-not-connect/87697/4 "2024-05-05T16:10:51Z")

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show more information about your project and We can help U.

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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 August 2024 16:11 UTC](https://discourse.nodered.org/t/modbus-read-not-connect/87697/5 "2024-08-03T16:11:01Z")

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