Usage Tips:Feature: 1. Complete Isolation of Communication: The repeater module adopts an industrial-grade design, providing complete communication isolation, stable and reliable performance, with a transmission rate up to 300Kbps. 2. Isolated Power Module: The repeater module includes a built-in high-performance DC-DC isolated power module, achieving electrical isolation between ports. 3. 2-Channel Output: The repeater module supports 2-channel output for multi-device communication, allowing up to 256 nodes per channel, with extended transmission distance. 4. Automatic Control Technology: The 2-channel repeater features automatic data flow control technology, which automatically detects and manages data transmission direction. 5. Multiple Protection Measures: The 2-channel repeater provides ±15kV ESD protection, 600W dual TVS surge protection, and 2.5kV communication isolation. 6. Wide Power Supply Range: The 2-channel repeater supports a wide input voltage range of 9–36V DC, includes reverse polarity protection, and is designed for standard rail mounting. Specification: 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: Typical: Temperature: -30°C to 80°C, Humidity: > 95% RH Limit Value: -40°C to 85°C Isolation Voltage: Typical: 2000V Limit Value: 2500V Interface Protection: Typical: 600W Thunder Surge Limit: 600W 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 Size: Approx. 100 x 54 x 32mm / 3.9 x 2.1 x 1.3in Status Indicators: Power Indicator: Red, remains on after power is connected Data Indicator: Green, blinks when data is transmitted on the bus Terminal Interface Definition: VCC: Power supply interface (DC 9–36V) GND: Negative power terminal 485 A: RS485 signal input/output positive terminal 485 B: RS485 signal input/output negative terminal 485 A2: Second RS485 signal input/output positive terminal 485 B2: Second RS485 signal input/output negative terminal GND: Isolated RS485 terminal ground, can be connected to earth or shield wire 485 A1: First RS485 signal input/output positive terminal 485 B1: First RS485 signal input/output negative terminal Usage Instructions: A. RS485 Wiring Notes: 1. Use shielded twisted-pair cable for RS485 communication lines, preferably with spare strands; total length should not exceed 1500 meters. 2. Keep wiring away from high-voltage power lines; avoid parallel routing or bundling with power cables. 3. RS485 bus must use a daisy-chain (hand-in-hand) topology; star or branched connections are not recommended. 4. For systems with more than 30 controllers or cable runs over 500 meters, use of an RS485 repeater is recommended. 5. Equipment powered by AC must have proper chassis grounding. 6. Connect the GND terminals of all RS485 devices using shielded wires. B. RS485 Cable Selection Requirements: 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 2-core shielded twisted pair (for runs under 500 meters, standards may be relaxed, but twisted pair must still be used) C. Bus Configuration Limits: The bus consists of two or more physically interconnected devices. Maximum of 256 devices allowed without repeaters, with total bus length not exceeding 1500 meters. The bus should not have branches. If branches are unavoidable: 1. Branch length must not exceed 10 meters; total bus length must not exceed 800 meters; maximum of 50 devices per branch. 2. Keep signal lines away from interference sources. Route signal lines through low-interference pathways and avoid running parallel to high-power lines (e.g., 220V) or RF cables (e.g., CATV). Maintain separation of at least 0.5 meters if parallel routing is necessary. 3. All wire joints must be securely soldered or crimped and properly sealed against moisture 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 systems, connect the negative DC terminals of all devices (including those with independent power supplies) to form a unified signal ground, which serves as the DC power ground. 3. For systems with individual power supplies, connect the ground (black wire) pins of all bus devices to establish a common reference.