@fabianvolkers/n8n-nodes-modbus-trigger
Version:
n8n node to trigger Modbus Address on change
187 lines • 7.14 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Modbus = void 0;
const n8n_workflow_1 = require("n8n-workflow");
const GenericFunctions_1 = require("./GenericFunctions");
class Modbus {
constructor() {
this.description = {
displayName: 'MODBUS',
name: 'modbus',
icon: 'file:modbus.svg',
group: ['input'],
version: 1,
description: 'Read and write to MODBUS devices',
eventTriggerDescription: '',
defaults: {
name: 'MODBUS',
},
usableAsTool: true,
inputs: ['main'],
outputs: ['main'],
credentials: [
{
name: 'modbusApi',
required: true,
},
],
properties: [
{
displayName: 'Operation',
name: 'operation',
type: 'options',
options: [
{
name: 'Read',
value: 'read',
},
{
name: 'Write',
value: 'write',
},
],
default: 'read',
noDataExpression: true,
},
{
displayName: 'Memory Address',
name: 'memoryAddress',
type: 'number',
default: 1,
description: 'The memory address (register index) to read from or write to',
},
{
displayName: 'Quantity',
displayOptions: {
show: {
operation: ['read'],
},
},
name: 'quantity',
type: 'number',
default: 1,
description: 'The number of registers to read from',
},
{
displayName: 'Write Target',
displayOptions: {
show: {
operation: ['write'],
},
},
name: 'writeTarget',
type: 'options',
options: [
{
name: 'Register',
value: 'register',
},
{
name: 'Coil',
value: 'coil',
},
],
default: 'register',
},
{
displayName: 'Value',
displayOptions: {
show: {
writeTarget: ['register']
},
},
name: 'value',
type: 'number',
typeOptions: {
maxValue: 32767,
minValue: -32768,
},
default: 1,
description: 'The value to write to the memory address',
},
{
displayName: 'Coil Value',
displayOptions: {
show: {
writeTarget: ['coil'],
},
},
name: 'coilValue',
type: 'options',
options: [
{
name: 'On',
value: 0xFF00,
},
{
name: 'Off',
value: 0x0000,
},
],
default: 0xFF00,
},
],
};
}
async execute() {
let responseData = {};
const credentials = await this.getCredentials('modbusApi');
const client = await (0, GenericFunctions_1.createClient)(credentials);
const memoryAddress = this.getNodeParameter('memoryAddress', 0);
const operation = this.getNodeParameter('operation', 0);
if (operation === 'read') {
const quantity = this.getNodeParameter('quantity', 0);
await new Promise((resolve) => {
client.readHoldingRegisters({ address: memoryAddress, quantity }, (err, data) => {
var _a;
if (err) {
throw new n8n_workflow_1.NodeOperationError(this.getNode(), 'MODBUS Error: ' + err.message);
}
const returnData = {
data: (_a = data === null || data === void 0 ? void 0 : data.response.data) === null || _a === void 0 ? void 0 : _a.map((value) => value.readInt16BE(0)),
};
responseData = returnData;
resolve(responseData);
});
});
}
if (operation === 'write') {
const writeTarget = this.getNodeParameter('writeTarget', 0);
if (writeTarget === "register") {
const value = this.getNodeParameter('value', 0);
const buffer = Buffer.alloc(2);
buffer.writeInt16BE(value);
await new Promise((resolve) => {
client.writeSingleRegister({ address: memoryAddress, value: buffer }, (err, data) => {
if (err) {
throw new n8n_workflow_1.NodeOperationError(this.getNode(), 'MODBUS Error: ' + err.message);
}
const returnData = {
data: data.response,
};
responseData = returnData;
resolve(responseData);
});
});
}
else if (writeTarget === "coil") {
const value = this.getNodeParameter('coilValue', 0);
await new Promise((resolve) => {
client.writeSingleCoil({ address: memoryAddress, value: value }, (err, data) => {
if (err) {
throw new n8n_workflow_1.NodeOperationError(this.getNode(), 'MODBUS Error: ' + err.message);
}
const returnData = {
data: data.response,
};
responseData = returnData;
resolve(responseData);
});
});
}
}
return [this.helpers.returnJsonArray(responseData)];
}
}
exports.Modbus = Modbus;
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