Created
December 31, 2020 12:09
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Modbus with dynamic IP, port, unit id, address, and quantity. Reuse node-modbus-serial from node-red-contrib-modbus package as external javascript in a function node
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| [ | |
| { | |
| "id": "83890845.33fc58", | |
| "type": "function", | |
| "z": "82dda199.0531", | |
| "name": "modbus", | |
| "func": "var modbus = global.get('modbusserial');\nvar client = new modbus();\n\nclient.connectTelnet(msg.payload.ip, { port: msg.payload.port })\n .then(setClient)\n .then(function() {\n node.warn(\"Connected!\");\n node.status({fill:\"green\", shape:\"dot\", text:\"connected\"});\n })\n .catch(function(e) {\n node.error(\"Disconnected: \" + e.message);\n node.status({fill:\"red\", shape:\"ring\", text:\"disconnected: \" + e.message});\n });\n\nfunction setClient() {\n client.setID(msg.payload.unitid);\n client.setTimeout(10000);\n run();\n}\n\nfunction run() {\n client.readInputRegisters(msg.payload.address, msg.payload.quantity)\n .then(function(d) {\n msg.payload = d.data;\n node.send(msg);\n node.done();\n })\n .catch(function(e) {\n node.error(\"Error: \" + e.message);\n })\n .then(close);\n}\n\nfunction close() {\n client.close();\n node.warn(\"Closed!\");\n //node.status({});\n node.status({fill:\"green\", shape:\"dot\", text:\"closed\"});\n}\n\nreturn;", | |
| "outputs": 1, | |
| "noerr": 0, | |
| "initialize": "", | |
| "finalize": "", | |
| "x": 320, | |
| "y": 140, | |
| "wires": [ | |
| [ | |
| "423d9f4.903996" | |
| ] | |
| ] | |
| }, | |
| { | |
| "id": "ca3ed935.2fd978", | |
| "type": "inject", | |
| "z": "82dda199.0531", | |
| "name": "totalizer", | |
| "props": [ | |
| { | |
| "p": "payload" | |
| }, | |
| { | |
| "p": "topic", | |
| "vt": "str" | |
| } | |
| ], | |
| "repeat": "", | |
| "crontab": "*/15 0-23 * * *", | |
| "once": true, | |
| "onceDelay": "30", | |
| "topic": "cibitung/totalizer", | |
| "payload": "{\"ip\":\"192.168.4.247\",\"port\":50000,\"unitid\":1,\"address\":1099,\"quantity\":6}", | |
| "payloadType": "json", | |
| "x": 160, | |
| "y": 140, | |
| "wires": [ | |
| [ | |
| "83890845.33fc58" | |
| ] | |
| ] | |
| }, | |
| { | |
| "id": "423d9f4.903996", | |
| "type": "debug", | |
| "z": "82dda199.0531", | |
| "name": "", | |
| "active": true, | |
| "tosidebar": true, | |
| "console": false, | |
| "tostatus": false, | |
| "complete": "false", | |
| "statusVal": "", | |
| "statusType": "auto", | |
| "x": 490, | |
| "y": 140, | |
| "wires": [] | |
| } | |
| ] |
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Edit node-red's settings.js and find the section functionGlobalContext, add modbusserial:require('modbus-serial') as explain at https://flows.nodered.org/flow/195773d3b493d81c9bf012f64da02ea3