Seeed so far didn’t support SCD30 sensor. Shoule build new sensor library and register corresponding paramater modbus address.
Here is the wiki may help you:Adding more Grove modules into the Builder | Seeed Studio Wiki
The github source code here for you:GitHub - Seeed-Studio/Seeed_Arduino_S2110: Source code for SenseCAP S2110 Grove to MODBUS RS485 Converter. An open-source tool to build LoRaWAN sensors
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