Technical Specifications Physical Interface: DB9 female RS‑232, screw terminal block for RS‑422‑RS‑485 Baud Rate Range: 300 bps to 115200 bps Maximum Transmission Distance: 1200 meters Optical Isolation Voltage: 1500 V Operating Temperature: ‑20℃ to +60℃ Supported Bus Modes: two‑wire RS‑485, four‑wire RS‑485, four‑wire RS‑422 Serial Format: 7‑8 data bits, 1‑2 stop bits, parity none‑even‑odd Power Supply Mode: self‑powered by RS‑232 RTS‑DTR signal, optional external 5‑12 VDC input
Functional Features Automatic data direction recognition without hardware handshake signals. Transparent bidirectional signal conversion for serial data stream. Full electrical isolation between RS‑232 host side and field bus side. Supports multi‑node RS‑485 bus network layout. Suppresses field surge voltage and ground‑loop disturbance. Plug‑and‑play design for rapid on‑site deployment.
Application Scenarios Connect Trident CIM communication module to Modbus RTU field bus network. Serial signal conversion for petrochemical and power plant SIS systems. Long‑distance point‑to‑multipoint serial data transmission. Safety instrument system renovation for serial interface capacity expansion.
Performance Parameters Zero signal distortion across full baud‑rate operating range. Reserved circuit position for bus terminal resistance installation. Built‑in transient surge withstand capability for field voltage spikes. Stable data communication under heavy electromagnetic interference conditions.
Material Composition Industrial grade anti‑interference printed circuit board. Metal alloy enclosure shell. High‑speed optocoupler isolation components. Flame‑retardant insulating filling material.
Structural Features Compact box‑shaped panel mounting structure. Combined DB9 port and screw terminal dual‑port layout. Isolation circuit unit enclosed inside metal housing. Pre‑drilled mounting holes for cabinet panel installation.
Working Principle The unit receives RS‑232 level signals and converts them into differential RS‑422‑RS‑485 signals through optocoupler isolation circuits, and executes reverse conversion simultaneously. Automatic transceiver logic judges signal flow direction to toggle transmit and receive status. Optical coupling components achieve complete electrical separation between host equipment and field bus circuits.
Installation Requirements Mount module on inner cabinet panel surface. Maintain physical separation distance from high‑voltage power cables. Deploy shielded twisted‑pair cables for all RS‑422‑RS‑485 signal wiring. Install matched terminal resistor at physical end of communication bus.
Usage Notes Do not inject external power onto signal terminals under self‑power operation mode. Strictly observe polarity marking of differential signal lines. Complete equipotential grounding for host cabinet. Avoid installation locations exposed to high‑intensity electromagnetic radiation sources.
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