# Modbus rtu issue with USB-RS485 adaptor "cannot lock port" on RPI

**URL:** <https://discourse.nodered.org/t/modbus-rtu-issue-with-usb-rs485-adaptor-cannot-lock-port-on-rpi/34586>\
**Category:** General\
**Created:** [20 October 2020 16:34 UTC](https://discourse.nodered.org/t/modbus-rtu-issue-with-usb-rs485-adaptor-cannot-lock-port-on-rpi/34586 "2020-10-20T16:34:27Z")\
**Posts on this page:** 1\
**Page:** 2

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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:** [7 November 2020 09:05 UTC](https://discourse.nodered.org/t/modbus-rtu-issue-with-usb-rs485-adaptor-cannot-lock-port-on-rpi/34586/21 "2020-11-07T09:05:19Z")

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