# Raspberry PI connect to RS485

**URL:** <https://discourse.nodered.org/t/raspberry-pi-connect-to-rs485/24502>\
**Category:** General\
**Created:** [9 April 2020 07:03 UTC](https://discourse.nodered.org/t/raspberry-pi-connect-to-rs485/24502 "2020-04-09T07:03:25Z")\
**Posts on this page:** 1\
**Showing post:** 23

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**Author:** ![Bond](https://avatars.discourse-cdn.com/v4/letter/b/9dc877/32.png) [@Bond](https://discourse.nodered.org/u/Bond)\
**Post date:** [21 April 2020 12:27 UTC](https://discourse.nodered.org/t/raspberry-pi-connect-to-rs485/24502/23 "2020-04-21T12:27:34Z")

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Thank you @gemini86 for your response. I think the wiring is correct now because the python can actually run the fans.  
I think the problem now is just trying to get that python file to work in Nodered.  
I'm trying to read the status of a working fan (i turned it on physically so it's spinning), but have an error of reading ('sequential dequeue command not possible') as shown in the picture:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/e/2/e26e077afc0559c62fccd5a9bf03d59b764f1548.png)

This is my setting of the Modbus Read node from node-red-contrib-modbus"

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/a/0/a024682d3d20a52b467e41b64e298eb1bca352b2.png)  
can anyone please help?

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