node-red-contrib-modbus example flow
Example flow from 3.0.0 and above - since v0.17.5 of Node-RED, please try also the Node-RED->Import->Examples->modbus
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in","z":"278c3ffc.fa40d8","name":"","url":"/modbus/flex/read","method":"get","upload":false,"swaggerDoc":"","x":190,"y":340,"wires":[["a06133ba.054e9"]]},{"id":"18f09288.c552b5","type":"debug","z":"278c3ffc.fa40d8","name":"","active":true,"console":"false","complete":"true","x":770,"y":130,"wires":[]},{"id":"f61cd2bb.db0808","type":"modbus-response","z":"278c3ffc.fa40d8","name":"","registerShowMax":20,"x":680,"y":170,"wires":[]},{"id":"a06133ba.054e9","type":"modbus-flex-getter","z":"278c3ffc.fa40d8","name":"","showStatusActivities":false,"showErrors":false,"server":"228160dd.0bd268","x":430,"y":340,"wires":[["4c623588.f2d704","ad5c1f3d.c60f"],["d42d9e3.9a23ae"]]},{"id":"d42d9e3.9a23ae","type":"modbus-response","z":"278c3ffc.fa40d8","name":"","registerShowMax":20,"x":670,"y":330,"wires":[]},{"id":"4c623588.f2d704","type":"debug","z":"278c3ffc.fa40d8","name":"","active":true,"console":"false","complete":"true","x":750,"y":290,"wires":[]},{"id":"33c8f5aa.a03022","type":"catch","z":"278c3ffc.fa40d8","name":"","scope":null,"x":650,"y":80,"wires":[["df84382d.4327b8"]]},{"id":"ad380629.c0b74","type":"modbus-flex-server","z":"278c3ffc.fa40d8","name":"","logEnabled":false,"serverPort":"18502","responseDelay":100,"unitId":1,"delayUnit":"ms","coilsBufferSize":20000,"registersBufferSize":20000,"minAddress":0,"splitAddress":10000,"funcGetCoil":"function getFlexCoil(addr, unitID) {\n\tif (unitID === node.unitId && \n\t\taddr >= node.minAddress && \n\t\taddr <= node.splitAddress * 2) { \n\n\t\treturn node.coils.readUInt8(addr * node.bufferFactor) \n\t} \n}","funcGetInputRegister":"function getFlexInputRegister(addr, unitID) { \n\tif (unitID === node.unitId && \n\t\taddr >= node.minAddress && \n\t\taddr <= node.splitAddress) { \n\n\t\treturn node.registers.readUInt16BE(addr * node.bufferFactor) \n\t} \n}","funcGetHoldingRegister":"function getFlexHoldingRegsiter(addr, unitID) { \n\tif (unitID === node.unitId && \n\t\taddr > node.splitAddress && \n\t\taddr <= node.splitAddress * 2) { \n\n\t\treturn node.registers.readUInt16BE(addr * node.bufferFactor) \n\t} \n}","funcSetCoil":"function setFlexCoil(addr, value, unitID) { \n\tif (unitID === node.unitId && \n\t\taddr >= node.minAddress && \n\t\taddr <= node.splitAddress * 2) { \n\n\t\tnode.coils.writeUInt8(value, addr * node.bufferFactor) \n\t} \n}","funcSetRegister":"function setFlexRegister(addr, value, unitID) { \n\tif (unitID === node.unitId && \n\t\taddr >= node.minAddress && \n\t\taddr <= node.splitAddress * 2) { \n\n\t\tnode.registers.writeUInt16BE(value, addr * node.bufferFactor) \n\t} \n}","x":200,"y":70,"wires":[[],[],[]]},{"id":"ad5c1f3d.c60f","type":"http response","z":"278c3ffc.fa40d8","name":"","statusCode":"","headers":{},"x":630,"y":290,"wires":[]},{"id":"f566f9bf.dbec68","type":"http in","z":"278c3ffc.fa40d8","name":"","url":"/modbus/read","method":"get","upload":false,"swaggerDoc":"","x":180,"y":190,"wires":[["f4e4d112.5e3708"]]},{"id":"b3bee6f8.64944","type":"http response","z":"278c3ffc.fa40d8","name":"","statusCode":"","headers":{},"x":640,"y":130,"wires":[]},{"id":"df84382d.4327b8","type":"debug","z":"278c3ffc.fa40d8","name":"","active":true,"console":"false","complete":"true","x":800,"y":80,"wires":[]},{"id":"af9361fe.87ea18","type":"modbus-flex-write","z":"278c3ffc.fa40d8","name":"","showStatusActivities":false,"showErrors":false,"server":"228160dd.0bd268","x":420,"y":530,"wires":[["3540312d.5017c6"],["b0288009.f96ae8"]]},{"id":"fdbc5e3e.e35fb8","type":"modbus-write","z":"278c3ffc.fa40d8","name":"","showStatusActivities":false,"showErrors":false,"unitid":"","dataType":"HoldingRegister","adr":"0","quantity":"1","server":"228160dd.0bd268","x":410,"y":440,"wires":[["b33411ba.b3b498"],["75fa26b3.414c"]]},{"id":"4f9b6223.e98aa4","type":"http in","z":"278c3ffc.fa40d8","name":"","url":"/modbus/write","method":"get","upload":false,"swaggerDoc":"","x":180,"y":440,"wires":[["fdbc5e3e.e35fb8"]]},{"id":"b33411ba.b3b498","type":"http response","z":"278c3ffc.fa40d8","name":"","statusCode":"","headers":{},"x":640,"y":400,"wires":[]},{"id":"75fa26b3.414c","type":"modbus-response","z":"278c3ffc.fa40d8","name":"","registerShowMax":20,"x":680,"y":440,"wires":[]},{"id":"1e4aafb.8f1855","type":"http in","z":"278c3ffc.fa40d8","name":"","url":"/modbus/flex/write","method":"get","upload":false,"swaggerDoc":"","x":190,"y":530,"wires":[["af9361fe.87ea18"]]},{"id":"3540312d.5017c6","type":"http response","z":"278c3ffc.fa40d8","name":"","statusCode":"","headers":{},"x":640,"y":490,"wires":[]},{"id":"b0288009.f96ae8","type":"modbus-response","z":"278c3ffc.fa40d8","name":"","registerShowMax":20,"x":680,"y":530,"wires":[]},{"id":"69788b37.05c614","type":"comment","z":"278c3ffc.fa40d8","name":"HTTP request GET working examples","info":"## Read\n\n### Flex Read\n\nhttp://localhost:1880/modbus/flex/read?value=0&unitid=1&fc=3&address=0&quantity=1\n\nhttp://localhost:1880/modbus/flex/read?value=0&unitid=1&fc=4&address=0&quantity=1\n\nhttp://localhost:1880/modbus/flex/read?value=0&unitid=1&fc=3&address=0&quantity=5\n\nhttp://localhost:1880/modbus/flex/read?value=0&unitid=1&fc=4&address=0&quantity=5\n\n### Read\n\nhttp://localhost:1880/modbus/read\n\n## Write\n\n### Test HTTP without Modbus\n\nhttp://localhost:1880/modbus/flex/write/test?value=[1,2,3,4,5]&unitid=1&fc=16&address=0&quantity=5\n\n\n### Flex Write\n\nhttp://localhost:1880/modbus/flex/write?value=10&unitid=1&fc=6&address=0&quantity=1\n\nhttp://localhost:1880/modbus/flex/write?value=[1,2,3,4,5]&unitid=1&fc=16&address=0&quantity=5\n\n### Write\n\nhttp://localhost:1880/modbus/write\n","x":240,"y":140,"wires":[]},{"id":"a3dd6f31.9eb17","type":"http in","z":"278c3ffc.fa40d8","name":"","url":"/modbus/flex/write/test","method":"get","upload":false,"swaggerDoc":"","x":220,"y":620,"wires":[["efac3450.e15668"]]},{"id":"d88e2d99.cd96e","type":"debug","z":"278c3ffc.fa40d8","name":"","active":true,"console":"false","complete":"true","x":590,"y":620,"wires":[]},{"id":"efac3450.e15668","type":"function","z":"278c3ffc.fa40d8","name":"","func":"if (msg.payload.value && msg.payload.value.indexOf(',') > -1) {\n msg.payload.value = JSON.parse(msg.payload.value)\n}\n\nif (msg.value && msg.value.indexOf(',') > -1) {\n msg.value = JSON.parse(msg.payload.value)\n}\nreturn msg;","outputs":1,"noerr":0,"x":450,"y":620,"wires":[["d88e2d99.cd96e","d20d5d26.f4c1a"]]},{"id":"d20d5d26.f4c1a","type":"http response","z":"278c3ffc.fa40d8","name":"","statusCode":"","headers":{},"x":590,"y":660,"wires":[]},{"id":"228160dd.0bd268","type":"modbus-client","z":"278c3ffc.fa40d8","name":"Modbus Flex Server","clienttype":"tcp","bufferCommands":true,"stateLogEnabled":false,"tcpHost":"127.0.0.1","tcpPort":"18502","tcpType":"DEFAULT","serialPort":"/dev/ttyUSB","serialType":"RTU-BUFFERD","serialBaudrate":"9600","serialDatabits":"8","serialStopbits":"1","serialParity":"none","serialConnectionDelay":"100","unit_id":"1","commandDelay":"1","clientTimeout":"1000","reconnectTimeout":"2000"}]
