modbus-connect/test-node.js

Modbus RTU over Web Serial and Node.js SerialPort

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, 0, {
        timeout: 1000,
        crcAlgorithm: 'crc16Modbus',
        retryCount: 3,             // Кол-во попыток повтора запроса
        retryDelay: 300,           // Задержка между повторами
    });

    await client.connect();

    await client.writeSingleRegister(2040, 0);
    const regs = await client.readHoldingRegisters(2040, 1);
    console.log(regs);

    await client.disconnect();
}

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