energy meter spm91, rs485 module, protocol modbus, esp8266

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did ever use energy meter spm91 , rs485 communicate arduino uno? please tell me. find error says "modbus_construct not declared". think can't find right library rs485. please me how fix . or maybe have correct library? btw. need help..

i'm not rs485 expert there long thread on similar issues starting here


Arduino Forum > Topics > Home Automation and Networked Objects > energy meter spm91, rs485 module, protocol modbus, esp8266


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