Question about Modbus settings on D105 ext.

1. You need Modbus protocol description from the manufacturer of your sensor/device.

2. Then study D105 Modbus article

https://support.smart-maic.com/en/knowledge-bases/2/articles/1038-d105-in-modbus-server-mode

3. We recommend using the USB to RS485 converter and Windows PC

https://shop.smart-maic.com/shop/product/usb-to-rs485-converter-236

4. Using the RS485 Tool utility: https://smart-maic.com/download/rs485_tool.zip

send the byte sequence to the sensor and receive the result.

5. When you get the correct result, transfer the byte sequence to the D105 settings in Modbus server mode.

Done. )