alex9ufo 聰明人求知心切: Modbus RTU (Serial Port)Node-Red Dashboards and MQTT Modbus Bridge

Modbus RTU(Serial Port) Node-Red Dashboards and MQTT Modbus Bridge

參考來源https://stevesnoderedguide.com/node-red-modbus-dashboards

316201"C倉庫"Modbus RTU 4路繼電器模組12V 四路開關量輸入光耦隔離 RS485 W8.19012

https://www.ruten.com.tw/item/show?21904711229817

ModBus RTU

Form
Function	var fc=1; var sa=0; var addresses=8; var slave_ip="COM8"; msg.payload={value: msg.payload, 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses }; return msg;
Function	var fc=msg.payload.fc; var sa=msg.payload.sa; var addresses=msg.payload.addresses; var slave_ip=msg.payload.slave_ip; var payload={ 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses }; msg.payload=JSON.stringify(payload); return msg
Function	var topic=msg.topic; if(topic=="alex9ufo/modbus/response/read") msg.read=msg.payload.data; else msg.write=msg.payload; return msg;
Form
Function	var fc=msg.payload.fc; var sa=msg.payload.sa; var addresses=msg.payload.addresses; var value=msg.payload.value; var values=msg.payload.values; var slave_ip=msg.payload.slave_ip; if (fc==16 \|\| fc==15){ value=JSON.parse(msg.payload.values); node.log(value); } payload={"value":value , 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses }; msg.payload=JSON.stringify(payload); return msg
ModBus Client 設定 Local getter Modbus Flex Write

Change

設定msg.topic

Node-Red

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