import type ModbusRTU from 'modbus-serial';
/**
 * Device identification result from discovery attempt
 * Provides comprehensive information about device presence and capabilities
 */
export interface DeviceIdentificationResult {
    /** Whether a Modbus device is present at this address/configuration */
    present: boolean;
    /** Response time in milliseconds */
    responseTimeMs: number;
    /** Vendor/manufacturer name (from FC43) */
    vendorName?: string;
    /** Product code/identifier (from FC43) */
    productCode?: string;
    /** Model name (from FC43) */
    modelName?: string;
    /** Firmware/hardware revision (from FC43) */
    revision?: string;
    /** Whether device supports FC43 (Read Device Identification) */
    supportsFC43?: boolean;
    /** Device present but returned Modbus exception code */
    exceptionCode?: number;
    /** Request timed out (no response) */
    timeout?: boolean;
    /** CRC check failed (wrong serial parameters) */
    crcError?: boolean;
}
/**
 * Attempt to identify a Modbus device at the current client configuration
 *
 * Uses FC43 (Read Device Identification) to probe for device presence.
 * Any Modbus response (including exceptions) indicates a device is present.
 * Only timeouts and CRC errors mean no device with these parameters.
 *
 * @param client - Configured ModbusRTU client (address, serial params, and timeout already set)
 * @returns Device identification result
 *
 * @example
 * ```typescript
 * const client = new ModbusRTU()
 * await client.connectRTUBuffered('/dev/ttyUSB0', { baudRate: 9600 })
 * client.setID(1)
 * client.setTimeout(1000)
 *
 * const result = await identifyDevice(client)
 * if (result.present) {
 *   console.log(`Found device: ${result.vendorName ?? 'Unknown'}`)
 * }
 * ```
 */
export declare function identifyDevice(client: ModbusRTU): Promise<DeviceIdentificationResult>;
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