/**
 * Modbus function code handlers
 */
import type { EmulatedDevice } from '../device.js';
import type { VerboseLogger } from '../verbose-logger.js';
export declare const ILLEGAL_FUNCTION = 1;
export declare const ILLEGAL_DATA_ADDRESS = 2;
export declare const ILLEGAL_DATA_VALUE = 3;
/**
 * Handle a Modbus request and return the response
 */
export declare function handleModbusRequest(device: EmulatedDevice, request: Buffer, verboseLogger?: VerboseLogger): Buffer;
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