Shows how to use node-red-contrib-modbus. This flow uses the Modbus Server, Modbus Read, and Modbus Write nodes. It also uses the Node-Red dashboard to create a simple user interface for writing and reading the value.
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Modbus Demo
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msg","outputs":1,"noerr":0,"x":446.83331298828125,"y":220.67724800109863,"wires":[["ca982324.01be8"]]},{"id":"28a61341.912bdc","type":"delay","z":"152fe1ef.7f71de","name":"","pauseType":"delay","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":265,"y":220.34393501281738,"wires":[["c88810d6.ae4e"]]},{"id":"1c39bdab.bc0ca2","type":"function","z":"152fe1ef.7f71de","name":"Startup Values","func":"msg.payload = { value:[100,90,100,200,100,200], \n'fc': 16, \n'unitid': 1, \n'address': 1, \n'quantity': 6 } \nreturn msg","outputs":1,"noerr":0,"x":446.83331298828125,"y":256.67724800109863,"wires":[["ca982324.01be8"]]},{"id":"f08c1401.e2b0e8","type":"delay","z":"152fe1ef.7f71de","name":"","pauseType":"delay","timeout":"6","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":265,"y":256.3439350128174,"wires":[["1c39bdab.bc0ca2"]]},{"id":"ed66618e.5bc3c","type":"comment","z":"152fe1ef.7f71de","name":"Startup Sim 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