# Modbus serial RTU communication

**URL:** <https://discourse.nodered.org/t/modbus-serial-rtu-communication/92066>\
**Category:** General\
**Tags:** modbus\
**Created:** [30 September 2024 08:17 UTC](https://discourse.nodered.org/t/modbus-serial-rtu-communication/92066 "2024-09-30T08:17:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![vsk17](https://avatars.discourse-cdn.com/v4/letter/v/8797f3/32.png) [@vsk17](https://discourse.nodered.org/u/vsk17)\
**Post date:** [30 September 2024 08:17 UTC](https://discourse.nodered.org/t/modbus-serial-rtu-communication/92066/1 "2024-09-30T08:17:58Z")

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I am trying to establish the communication between energy-meter and laptop via modbus serial rtu.  
However I am not able to do so, and getting timeout error.  
It would be very helpful if someone can help in this.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/8/9/899e390a3db990eee8c9b12aa70da13da841f85c.png)

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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:** [30 September 2024 08:30 UTC](https://discourse.nodered.org/t/modbus-serial-rtu-communication/92066/2 "2024-09-30T08:30:38Z")

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At a guess, the COM port is locked by this  
 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/4/9/49e9dde46724d4dacb8cfa87bc415c6a8ba25604.png)

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [29 December 2024 08:30 UTC](https://discourse.nodered.org/t/modbus-serial-rtu-communication/92066/3 "2024-12-29T08:30:49Z")

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