Feature: 1. Complete Isolation of Communication: The repeater module features an industrial-grade design with complete communication isolation, ensuring stable and reliable performance and a transmission rate of up to 300Kbps. 2. Isolated Power Module: The module includes a built-in high-performance DC-DC isolated power module, providing electrical isolation between ports. 3. 2-Channel Output: Supports two-channel output for multi-device communication, allowing up to 256 nodes per channel with extended transmission distance. 4. Automatic Control Technology: Equipped with automatic data flow control technology that automatically detects and manages data transmission direction. 5. Multiple Protection Measures: Includes ±15kV ESD protection, 600W dual TVS surge protection, and 2.5kV communication isolation for enhanced reliability. 6. Wide Power Supply Range: Operates on a wide DC input range of 9–36V with reverse connection protection and supports standard DIN rail mounting. Specifications: Item Type: Repeater Module Material: PP Operating Voltage: - Typical Value: DC 9–36V - Limit Value: DC 40V Power Rating: - Typical: 0.36W (9V/35mA; 12V/27mA; 24V/15mA) - Limit Value: 0.5W Operating Environment: - Temperature: -30°C to 80°C (Typical); -40°C to 85°C (Limit) - Humidity: >95% RH (non-condensing) Isolation Voltage: - Typical: 2000V - Limit Value: 2500V Interface Protection: - Typical: 600W surge protection Load Capacity: - Typical: 1–128 nodes - Limit: 256 nodes Communication Distance: - Typical: 0–1500m - Limit: 2000m Communication Speed: - Typical: 300bps–115.2Kbps - Limit Value: 300Kbps Dimensions: Approx. 100 x 54 x 32mm / 3.9 x 2.1 x 1.3in Status Indicators: - Power Indicator: Red LED, stays on when powered - Data Indicator: Green LED, blinks when data is transmitted on the bus Terminal Interface Definition: - VCC: Power supply input (DC 9–36V) - GND: Negative power terminal - 485 A: RS485 signal input/output positive - 485 B: RS485 signal input/output negative - 485 A2: Second RS485 signal input/output positive - 485 B2: Second RS485 signal input/output negative - GND: Isolated RS485 terminal ground, can be connected to earth or shield - 485 A1: First RS485 signal input/output positive - 485 B1: First RS485 signal input/output negative Usage Guidelines: A. RS485 Wiring Notes: 1. Use shielded twisted-pair cable for RS485 communication lines; spare strands are recommended. Maximum recommended length: 1500 meters. 2. Keep wiring away from high-voltage power lines. Avoid running in parallel with power cables or bundling together. 3. The RS485 bus must use a daisy-chain (hand-in-hand) topology. Avoid star or branched connections. 4. For systems with more than 30 controllers or cable runs exceeding 500 meters, use of an RS485 repeater is recommended. 5. Equipment powered by AC must have proper grounding. 6. Connect the GND of all RS485 devices using a shielded wire. B. Cable Selection for RS485 Communication: - Use 2-core shielded twisted-pair cable - Copper conductor, wire diameter: 0.5–0.75 mm² - Impedance: 38–88 ohms/km - Capacitance: 30–50 nF/km - Twist pitch: 20 mm (for runs over 500 meters; shorter runs may use reduced specs but must remain twisted pair) C. Bus Requirements: - The bus consists of two or more physically connected devices. - Maximum of 256 devices per bus without repeaters. - Maximum bus length: 1500 meters without repeaters. - Avoid bus branches. If unavoidable: 1. Branch length ≤ 10 meters; total bus length ≤ 800 meters; maximum 50 devices per branch. 2. Keep signal lines away from interference sources. Route signal lines through low-interference paths. Avoid running parallel to high-power lines (e.g., 220V) or RF cables (e.g., CATV). Minimum separation: 0.5 meters if parallel. 3. All wire joints must be securely soldered or crimped and properly sealed against moisture (e.g., using waterproof tape or epoxy resin). D. Signal Common Ground: 1. All devices on the same network segment must share a common signal ground to prevent common-mode interference. 2. For centralized power supply, connect the negative DC terminals of all devices (including those with independent power) to form a common signal ground. This ground is the DC power ground. 3. For systems with independent power supplies, connect the ground (black wire) pins of all bus devices to establish a unified reference.