{  
    "nodes": [  
        {  
            "id": "MockVacuum1",  
            "name": "模拟真空泵",  
            "children": [],  
            "parent": null,  
            "type": "device",  
            "class": "mock_vacuum",  
            "position": {  
                "x": 620.6111111111111,  
                "y": 171,  
                "z": 0  
            },  
            "config": {  
                "port": "MOCK"  
            },  
            "data": {  
                "status": "Idle",  
                "power_state": "Off",  
                "pump_state": "Stopped",  
                "vacuum_level": 1013.25,  
                "target_vacuum": 50.0,  
                "pump_speed": 0.0,  
                "pump_efficiency": 95.0,  
                "max_pump_speed": 100.0  
            }  
        }  
    ],  
    "links": []  
}