The **FCRS-4B-R** is an industrial-grade **Four-Channel RS-485 Hub/Splitter** (often referred to as a "Data Sharer" or "Concentrator"). It is designed to expand RS-485 networks by splitting a single master signal into four isolated slave channels. --- ### ## Technical Specifications The electronic architecture of the FCRS-4B-R focuses on signal integrity and protection in harsh electrical environments. | Feature | Specification | | :--- | :--- | | **Interface Standard** | EIA/TIA RS-485 / RS-232 C | | **Input Port** | 1x RS-485 / RS-232 (Master) | | **Output Ports** | 4x RS-485 (Slaves) | | **Power Supply** | 9-40V DC (Internal regulator) | | **Isolation Voltage** | 2500V RMS (Continuous) | | **Transmission Rate** | 300 bps to 115.2 Kbps | | **Transmission Distance** | Up to 1200 meters per port | --- ### ### Core Electronic Components & Features #### 1. Photoelectric Isolation (Optocouplers) The "R" in the model often signifies reinforced isolation. The device uses high-speed optocouplers to electrically separate the input side from the four output channels. This prevents ground loops and protects the master controller from high-voltage surges on the slave lines. #### 2. TVS (Transient Voltage Suppressors) Each of the four output ports is equipped with TVS diodes. These components act as "clamps" that divert excess voltage to the ground during lightning strikes or ESD (Electrostatic Discharge) events, providing up to 600W of surge protection per line. #### 3. Zero-Delay Automatic Switching Unlike half-duplex systems that require software-driven "Direction Control" (RTS/CTS), the FCRS-4B-R uses an internal I/O circuit that automatically senses the direction of data flow. - **Electronic Logic:** When data is detected on the RX line, the internal gate triggers the TX buffer instantly. #### 4. Star Topology Management RS-485 is natively a "Daisy Chain" protocol. Using the FCRS-4B-R allows for a **Star Topology**, where if one branch (e.g., Channel 2) short-circuits or fails, the electronic isolation ensures that Channels 1, 3, and 4 continue to operate without interference. --- ### ### Wiring Configuration (Typical) ```markdown [Master Device] -> [Input: A+, B-, GND] | |-----------|-----------| V V V [CH1 A/B] [CH2 A/B] [CH3 A/B] ... [CH4] ``` ---