/**
 * RTU (serial) transport for Modbus emulator
 *
 * This implementation uses modbus-serial ServerSerial for protocol handling.
 */
import { BaseTransport } from './base.js';
export interface RtuTransportConfig {
    port: string;
    baudRate?: number;
    parity?: 'none' | 'even' | 'odd';
    dataBits?: 7 | 8;
    stopBits?: 1 | 2;
    lock?: boolean;
}
export declare class RtuTransport extends BaseTransport {
    private config;
    private requestHandler?;
    private server?;
    private started;
    constructor(config: RtuTransportConfig);
    start(): Promise<void>;
    stop(): Promise<void>;
    send(_slaveId: number, _response: Buffer): Promise<void>;
    onRequest(handler: (slaveId: number, request: Buffer) => Promise<Buffer>): void;
    /**
     * Handle register read operations
     */
    private handleRegisterRead;
    /**
     * Handle register write operations
     */
    private handleRegisterWrite;
    /**
     * Handle coil read operations
     */
    private handleCoilRead;
    /**
     * Handle coil write operations
     */
    private handleCoilWrite;
}
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