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 to achieve 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 that 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 9–36VDC with reverse connection protection and is compatible with standard DIN 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 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 interface (DC 9–36V) - GND: Negative power supply 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 - Use an RS485 repeater when connecting more than 30 controllers or when cable length exceeds 500 meters - 5 - Equipment with AC power supply and chassis must be properly grounded - 6 - Connect the GND terminal of all RS485 devices using a shielded wire - 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 runs under 500 meters, standards may be relaxed but must remain twisted pair) C - Bus Configuration Limits: - The bus can connect two or more devices, with a maximum of 256 devices without repeaters - - Maximum bus length without repeaters: 1500 meters - - Avoid bus branches; if unavoidable: 1 - Branch length ≤ 10 meters, total bus length ≤ 800 meters, maximum 50 devices on branch lines - 2 - Keep signal lines away from interference sources; route through low-voltage conduits - Avoid running parallel to high-power (e - g - , 220V) or RF signal lines - If parallel routing is necessary, maintain a distance of at least 0 - 5 meters - 3 - All wire joints must be soldered or tightly crimped and 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 power supplies (including devices with independent power) to form a unified signal ground, which serves as the DC power ground - 3 - For single independent power supply setups, connect the ground (black wire) pins of all bus devices to establish a common reference