node-fxplc/dist/esm/protocol-utils.js

Node.js library for low-level Mitsubishi FX (MELSEC) PLC framed protocol communication

// protocol-utils.js
// Funzioni di supporto protocollo (checksum)
// protocol-utils.js
// Protocol helper functions (checksum, etc.).
export function calcChecksum(payload) {
    // payload: Buffer (payload + ETX in original Python logic)
    const sum = payload.reduce((a, b) => a + b, 0);
    const hex = (sum & 0xFF).toString(16).toUpperCase().padStart(2, '0');
    return Buffer.from(hex, 'ascii');
}