# Node-red-contrib-modbus and MAX485 TTL to RS485 converter

**URL:** <https://discourse.nodered.org/t/node-red-contrib-modbus-and-max485-ttl-to-rs485-converter/72447>\
**Category:** General\
**Created:** [20 December 2022 07:29 UTC](https://discourse.nodered.org/t/node-red-contrib-modbus-and-max485-ttl-to-rs485-converter/72447 "2022-12-20T07:29:14Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Aivaras1](https://avatars.discourse-cdn.com/v4/letter/a/8797f3/32.png) [@Aivaras1](https://discourse.nodered.org/u/Aivaras1)\
**Post date:** [20 December 2022 07:29 UTC](https://discourse.nodered.org/t/node-red-contrib-modbus-and-max485-ttl-to-rs485-converter/72447/1 "2022-12-20T07:29:14Z")

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Hi,

Is it possible to use MAX485 TTL to RS485 converter in node-red ?  
converter link: [https://roboticx.ps/product/max485-ttl-to-rs485/](https://roboticx.ps/product/max485-ttl-to-rs485/)  
library: [node-red-contrib-modbus (node) - Node-RED](https://flows.nodered.org/node/node-red-contrib-modbus)

I found that it uses /dev/ttyS4

I connected it to UART4. I am using Beaglebone green gateway  
4.19.94-ti-r73

done this configuration  
config-pin p9.13 uart  
config-pin p9.11 uart

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**Author:** ![Josh](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/josh/32/62208_2.png) [@Josh](https://discourse.nodered.org/u/Josh)\
**Post date:** [20 December 2022 12:58 UTC](https://discourse.nodered.org/t/node-red-contrib-modbus-and-max485-ttl-to-rs485-converter/72447/2 "2022-12-20T12:58:00Z")

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You can run it. The modbus node works perfectly.

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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:** [18 February 2023 12:58 UTC](https://discourse.nodered.org/t/node-red-contrib-modbus-and-max485-ttl-to-rs485-converter/72447/3 "2023-02-18T12:58:39Z")

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