How to use the crc16modbus function from crc

Find comprehensive JavaScript crc.crc16modbus code examples handpicked from public code repositorys.

crc.crc16modbus is a function in Node.js that calculates a CRC (cyclic redundancy check) checksum using the Modbus protocol.

modbus-client-serial.js

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let onError = err => this.emit('error', err);

let onSend = (pdu, unitId) => {
    let pkt = Put().word8((unitId === undefined ? this.options.unitId : unitId) || 0).put(pdu);
    let buf = pkt.buffer();
    let crc16 = crc.crc16modbus(buf);
    pkt = pkt.word16le(crc16).buffer();

    connect();

+ 5 other calls in file

monarco.js

GitHub: monarco/monarco-hat-driver-nodejs

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var ao2 = this._convertAnalogOutput(this.analogOutputs[1]);
txbuf[22] = (ao2 >> 0) & 0xFF;
txbuf[23] = (ao2 >> 8) & 0xFF;

var crc = CRC.crc16modbus(txbuf);

var crcBuf = new Buffer(2);
crcBuf[0] = (crc >> 0) & 0xFF;
crcBuf[1] = (crc >> 8) & 0xFF;

+ 7 other calls in file

How does crc.crc16modbus work?

When you use crc.crc16modbus in your Node.js code, you are using a function that calculates a CRC (cyclic redundancy check) checksum using the Modbus protocol. To use crc.crc16modbus, you pass a buffer of data as an argument, and it returns a CRC checksum value as a number. The CRC-16 Modbus algorithm is used to calculate the checksum, which is a widely used error-detection algorithm in communication networks. Here is an example of using crc.crc16modbus to calculate a CRC checksum for a buffer of data: javascript Copy code {{{{{{{ const crc = require('crc'); const data = Buffer.from('Hello, world!'); const checksum = crc.crc16modbus(data); console.log(`The CRC-16 Modbus checksum of ${data.toString()} is ${checksum}`); In this example, we are using crc.crc16modbus to calculate a CRC-16 Modbus checksum for a buffer of data containing the string 'Hello, world!'. We log the checksum value to the console. Overall, crc.crc16modbus provides a simple and powerful way to calculate a CRC checksum using the Modbus protocol in Node.js, allowing you to detect errors in communication networks and other applications.

Ai Example

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const crc = require("crc");

const data = Buffer.from([0x01, 0x02, 0x03, 0x04]);
const checksum = crc.crc16modbus(data);

console.log(
  `The CRC-16 Modbus checksum of [0x01, 0x02, 0x03, 0x04] is 0x${checksum.toString(
    16
  )}`
);

In this example, we are using crc.crc16modbus to calculate a CRC-16 Modbus checksum for a buffer of data containing the values [0x01, 0x02, 0x03, 0x04]. We use the .toString(16) method to convert the checksum value to a hexadecimal string, which we log to the console. Note that crc.crc16modbus is just one of many CRC checksum functions available in the crc library for Node.js, which provides a number of powerful algorithms for detecting errors in data transmission.

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