RS485 Communication error

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Ajinkya09
Posts: 13
Joined: 11 Jan 2024, 06:27

RS485 Communication error

Post by Ajinkya09 »

I'm trying to read the temperature sensor (Pt1000) value from Node-RED.

Connection: The Pt1000 sensor is connected to a digital converter, which converts the readings into digital values. The converter is connected to the RS485 socket of the Revolution Pi (running Raspbian OS). I tried to read the value on NodeRED but encountered an error.
refer attach picture.
WhatsApp Image 2024-04-25 at 17.31.48_a2cb3ad9.jpg
WhatsApp Image 2024-04-25 at 17.31.37_9f629662.jpg
WhatsApp Image 2024-04-25 at 17.31.17_7da7c905.jpg
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dirk
KUNBUS
Posts: 2001
Joined: 15 Dec 2016, 13:19

Re: RS485 Communication error

Post by dirk »

Hello Ajinkya09, thank you for your detailed description of the error. Please send me an SOS report.
Revolution Pi SOS Report
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dirk
KUNBUS
Posts: 2001
Joined: 15 Dec 2016, 13:19

Re: RS485 Communication error

Post by dirk »

Hi Ajinkya09, now we remembered one more thing, you are using /dev/ttyAMA0 - this is the UART that is connected to the PiBrige. So that can't work. With RevPi Connect (+)/S/SE the correct UART is /dev/ttyUSB0 ;)
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