Industrial-grade design with complete communication isolation for stable and reliable performance, supporting a transmission rate of up to 500 Kbps. Built-in high-quality DC/DC isolated power module provides electrical isolation between ports. Supports multi-machine communication with up to 128 nodes, and transmission distance up to 1200 meters. Features automatic data flow control technology to automatically detect and manage data transmission direction. Multiple protection measures include 15 kV ESD protection (positive and negative), 600 W dual-channel TVS protection, and 2.5 kV communication isolation. Recommended operating values (typical): - Operating voltage: 9 V to 36 V DC - Rated power: 0.36 W (9 V / 35 mA; 12 V / 27 mA; 24 V / 15 mA) - Operating temperature: -30°C to 70°C - Node capacity: 1 to 128 nodes - Communication distance: 0 to 1200 meters - Communication rate: 300 to 500,000 bits/s Absolute maximum ratings: - Operating voltage: 9 V to 36 V DC - Maximum power: 0.5 W - Operating temperature: -40°C to 80°C - Maximum nodes: 128 - Maximum communication distance: 1200 meters - Maximum communication rate: 500 Kbps Wiring guidelines: 1. Use shielded twisted pair cable for 485 communication lines. Include spare strands if possible, and ensure total cable length does 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 for the 485 network; avoid star or fork connections. 4. Use a 485 repeater when connecting more than 30 controllers 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 the shielded cable. 7. Install a 120-ohm terminating resistor in parallel across 485+ (A) and 485- (B) at the last device on the 485 bus.