Industrial-grade design with complete communication isolation ensures stable and reliable performance. Transmission rate up to 500 Kbps. Built-in high-quality DC/DC isolated power module provides electrical isolation between ports. Supports multi-machine communication, connecting up to 128 nodes with transmission distance up to 1200 meters. Features automatic data flow control technology that automatically detects and manages data transmission direction. Includes multiple protection measures: 15 kV ESD protection (positive and negative), 600 W dual-channel TVS protection, and 2.5 kV communication isolation. Specifications: - Working voltage: 9–36 V DC - Rated power: 0.36 W (9 V/35 mA; 12 V/27 mA; 24 V/15 mA) - Maximum power: 0.5 W - Operating temperature: -30°C to 70°C (operating range), -40°C to 80°C (storage range) - Node capacity: 1–128 nodes - Communication distance: 0–1200 meters - Data rate: 300–500,000 bits/s (up to 500 Kbps) Wiring instructions: 1. Use shielded twisted-pair cable for 485 communication lines. Include spare wires if possible. Total cable length should not exceed 1200 meters. 2. Keep communication wires away from high-voltage lines. Avoid running parallel to power cables or bundling together. 3. Use a daisy-chain bus topology; avoid star or fork connections. 4. Use a 485 repeater when connecting more than 30 devices or when cable length exceeds 500 meters. 5. Ensure proper grounding for all equipment and AC power enclosures. 6. Connect the GND of all 485 devices using a shielded cable. 7. Install a 120 ohm termination resistor in parallel across 485+ (A) and 485- (B) at the last device on the bus.