Please guide me for Pi Terminal 7" - RS485 sensors
I have Pi Terminal 7" and try to connect with RS485 temperature and humidity sensor. I use Node-RED to reading value from sensor and display out to its dashboard. I used Modbus-Read node and specified "/dev/ttyS0" as a serial server. But it's always reconnecting for Modbus-Read node.
Please guide me to establish connection with the RS485 devices.
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Hi mshettha,
Thank you for reaching out.
Our technical support team is currently looking into your issue. Please be patient, and we will get back to you as soon as possible.
Best regards,
Hi mshettha,
The Pi Terminal 7" can normally connect and work with RS485 sensors without any special limitations.
Could you please describe in more detail how you are using it? What is the exact model of the sensor you are using?
It would be helpful if you could also provide some screenshots, photos, or videos so we can better understand your issue.
Thanks！Have a good day!
Hi Jennie,
I connected Pi Terminal to sensor via RS485 port.
On Node-RED flow I use Modbus-Read node then output to debug "sensor 2". But there is no debug output.
Inside Modbus-Read node I configured to read holding registers address Slave ID 6, address 0, 2 values.
For the server settings Node-Red recognized only one serial port which is "/dev/ttyS0"
My concerns is the serial port that I have setup is incorrect.
Thank you.
sorry, I forgot to mentioned sensor. Please find details sensor information from this link.
https://www.sumtech.co.th/product-detail.html?pd_code=TH-031
Hi mshettha,
The sensor must share a common ground with the RS485 interface.
Hi Jennie,
I have tried to share common ground among Pi Terminal RS485 Port with the ground sensor. But I still can not read data from sensor using Modbus-Read node on Note-RED.
.