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Created October 22, 2017 17:45
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Modbus via HTTP requests

some examples how to work with Modbus and HTTP requests and response ...

[
{
"id": "934a0213.59b38",
"type": "tab",
"label": "Modbus HTTP",
"disabled": false,
"info": ""
},
{
"id": "84ee0e0b.ed5c9",
"type": "modbus-getter",
"z": "934a0213.59b38",
"name": "",
"showStatusActivities": false,
"showErrors": false,
"unitid": "",
"dataType": "HoldingRegister",
"adr": "0",
"quantity": "4",
"server": "7e257e6c.0c55",
"x": 410,
"y": 190,
"wires": [
[
"52cb7240.5c223c",
"95a8b25.2972b5"
],
[
"1f9d545f.1fd4fc"
]
]
},
{
"id": "44d50ac8.4bea94",
"type": "http in",
"z": "934a0213.59b38",
"name": "",
"url": "/modbus/flex/read",
"method": "get",
"upload": false,
"swaggerDoc": "",
"x": 190,
"y": 340,
"wires": [
[
"6fd20edd.9d64a"
]
]
},
{
"id": "52cb7240.5c223c",
"type": "debug",
"z": "934a0213.59b38",
"name": "",
"active": true,
"console": "false",
"complete": "true",
"x": 770,
"y": 130,
"wires": []
},
{
"id": "1f9d545f.1fd4fc",
"type": "modbus-response",
"z": "934a0213.59b38",
"name": "",
"registerShowMax": 20,
"x": 680,
"y": 170,
"wires": []
},
{
"id": "6fd20edd.9d64a",
"type": "modbus-flex-getter",
"z": "934a0213.59b38",
"name": "",
"showStatusActivities": false,
"showErrors": false,
"server": "7e257e6c.0c55",
"x": 430,
"y": 340,
"wires": [
[
"6190d094.4b69d",
"90057f47.6116a"
],
[
"2ab12c2e.248074"
]
]
},
{
"id": "2ab12c2e.248074",
"type": "modbus-response",
"z": "934a0213.59b38",
"name": "",
"registerShowMax": 20,
"x": 670,
"y": 330,
"wires": []
},
{
"id": "6190d094.4b69d",
"type": "debug",
"z": "934a0213.59b38",
"name": "",
"active": true,
"console": "false",
"complete": "true",
"x": 750,
"y": 290,
"wires": []
},
{
"id": "ff16b6ed.33d458",
"type": "catch",
"z": "934a0213.59b38",
"name": "",
"scope": null,
"x": 650,
"y": 80,
"wires": [
[
"13def922.564957"
]
]
},
{
"id": "bd6165cf.5556f8",
"type": "modbus-flex-server",
"z": "934a0213.59b38",
"name": "",
"logEnabled": false,
"serverPort": "10502",
"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": "90057f47.6116a",
"type": "http response",
"z": "934a0213.59b38",
"name": "",
"statusCode": "",
"headers": {},
"x": 630,
"y": 290,
"wires": []
},
{
"id": "3e76ce1b.ecce22",
"type": "http in",
"z": "934a0213.59b38",
"name": "",
"url": "/modbus/read",
"method": "get",
"upload": false,
"swaggerDoc": "",
"x": 180,
"y": 190,
"wires": [
[
"84ee0e0b.ed5c9"
]
]
},
{
"id": "95a8b25.2972b5",
"type": "http response",
"z": "934a0213.59b38",
"name": "",
"statusCode": "",
"headers": {},
"x": 640,
"y": 130,
"wires": []
},
{
"id": "13def922.564957",
"type": "debug",
"z": "934a0213.59b38",
"name": "",
"active": true,
"console": "false",
"complete": "true",
"x": 800,
"y": 80,
"wires": []
},
{
"id": "a5d36532.8f2178",
"type": "modbus-flex-write",
"z": "934a0213.59b38",
"name": "",
"showStatusActivities": false,
"showErrors": false,
"server": "7e257e6c.0c55",
"x": 420,
"y": 530,
"wires": [
[
"8e948598.d4e568"
],
[
"1e6cd079.e072b"
]
]
},
{
"id": "82fbb199.0ffde",
"type": "modbus-write",
"z": "934a0213.59b38",
"name": "",
"showStatusActivities": false,
"showErrors": false,
"unitid": "",
"dataType": "HoldingRegister",
"adr": "0",
"quantity": "1",
"server": "7e257e6c.0c55",
"x": 410,
"y": 440,
"wires": [
[
"26dccb4e.a20d54"
],
[
"8281dfc5.214a5"
]
]
},
{
"id": "837d3e77.7e547",
"type": "http in",
"z": "934a0213.59b38",
"name": "",
"url": "/modbus/write",
"method": "get",
"upload": false,
"swaggerDoc": "",
"x": 180,
"y": 440,
"wires": [
[
"82fbb199.0ffde"
]
]
},
{
"id": "26dccb4e.a20d54",
"type": "http response",
"z": "934a0213.59b38",
"name": "",
"statusCode": "",
"headers": {},
"x": 640,
"y": 400,
"wires": []
},
{
"id": "8281dfc5.214a5",
"type": "modbus-response",
"z": "934a0213.59b38",
"name": "",
"registerShowMax": 20,
"x": 680,
"y": 440,
"wires": []
},
{
"id": "eb0c0441.6acc08",
"type": "http in",
"z": "934a0213.59b38",
"name": "",
"url": "/modbus/flex/write",
"method": "get",
"upload": false,
"swaggerDoc": "",
"x": 190,
"y": 530,
"wires": [
[
"a5d36532.8f2178"
]
]
},
{
"id": "8e948598.d4e568",
"type": "http response",
"z": "934a0213.59b38",
"name": "",
"statusCode": "",
"headers": {},
"x": 640,
"y": 490,
"wires": []
},
{
"id": "1e6cd079.e072b",
"type": "modbus-response",
"z": "934a0213.59b38",
"name": "",
"registerShowMax": 20,
"x": 680,
"y": 530,
"wires": []
},
{
"id": "c0a27f1a.38377",
"type": "comment",
"z": "934a0213.59b38",
"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": "11651dd7.39ac22",
"type": "http in",
"z": "934a0213.59b38",
"name": "",
"url": "/modbus/flex/write/test",
"method": "get",
"upload": false,
"swaggerDoc": "",
"x": 220,
"y": 620,
"wires": [
[
"18b385b6.4daf0a"
]
]
},
{
"id": "1fafc9da.7e6216",
"type": "debug",
"z": "934a0213.59b38",
"name": "",
"active": true,
"console": "false",
"complete": "true",
"x": 590,
"y": 620,
"wires": []
},
{
"id": "18b385b6.4daf0a",
"type": "function",
"z": "934a0213.59b38",
"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": [
[
"1fafc9da.7e6216",
"5ba40073.7997a"
]
]
},
{
"id": "5ba40073.7997a",
"type": "http response",
"z": "934a0213.59b38",
"name": "",
"statusCode": "",
"headers": {},
"x": 590,
"y": 660,
"wires": []
},
{
"id": "7e257e6c.0c55",
"type": "modbus-client",
"z": "934a0213.59b38",
"name": "",
"clienttype": "tcp",
"bufferCommands": true,
"stateLogEnabled": false,
"tcpHost": "127.0.0.1",
"tcpPort": "10502",
"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
}
]
@nirav1511
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http responce
"No response object"
show this error after modbus get request

@nirav1511
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Screenshot_3
how i set http responce from output of modbus getter node

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