modbus-connect/test-node.js

Modbus RTU over Web Serial and Node.js SerialPort

// test-node.js

const ModbusClient = require('./client.js');
const { createTransport } = require('./transport/factory.js');
const logger = require('./logger.js');
const PollingManager = require('./polling-manager.js');

const poll = new PollingManager()
const log = logger.createLogger('main');

async function main() {
    const transport = await createTransport('node', {
        port: 'COM4',
        baudRate: 9600,
        parity: 'none',
        dataBits: 8,
        stopBits: 1,
        // writeTimeout: 500,
        // readTimeout: 500
    });

    const client = new ModbusClient(transport, 1, {
        timeout: 1000,
        crcAlgorithm: 'crc16Modbus',
        retryCount: 3,             // Кол-во попыток повтора запроса
        retryDelay: 300,           // Задержка между повторами
    });

    await client.connect();

    // Define a polling task
    poll.addTask({
        id: 'read-sensors', // Task name
        resourceId: 'test', // Stream name
        priority: 1,        // Priority: method in queue (0...Infinity)
        interval: 1000,
        fn: [
        async () => await client.readHoldingRegisters(0, 10)
        ],
        onData: (data) => {
            console.log(JSON.stringify(data))
        },
        onError: async (error, index, attempt) => {
            console.log(error)
        },
        onStart: () => console.log('Polling measure data started'),
        onStop: () => console.log('Polling measure data stopped'),
        maxRetries: 3,
        backoffDelay: 300,
        taskTimeout: 1000
    })
    poll.startTask('read-sensors');
}

main().catch(err => {
    console.error('Fatal error in main:', err);
});