A 4-port RS-485 bus hub with optical isolation and surge protection, designed for industrial environments with complex electromagnetic interference. Each port is independently opto-isolated at 2500 V and protected against 600 W lightning surges, ensuring that a fault on one network segment does not affect the others.

The hub provides star-topology RS-485 bus connections with automatic data direction sensing, eliminating manual transmit/receive switching. It supports transmission distances up to 5 km (at 300 bps) or 1.2 km (at 115.2 kbps) over twisted pair or shielded cable, and is powered by a wide-range 9–30 V DC supply suitable for outdoor and industrial installations.

Key Features

• 4-Port Star Topology – Split one RS-485 bus into four independently protected segments
• 2500 V Optical Isolation – Prevents surge propagation between ports
• 600 W Surge Protection – Per-line lightning and transient protection on RS-485 ports
• ±15 kV ESD Protection – On the RS-232 port
• Automatic Direction Sensing – No manual transmit/receive control needed
• Short-Circuit & Open-Circuit Protection – On each port independently
• 7 Status LEDs – Power, TX, RX, and per-port fault indicators (E1–E4)

Specifications

• Interface Standards – RS-232C and RS-485 (EIA/TIA compatible)
• Working Mode – Asynchronous half-duplex
• Transmission Rate – 300 bps to 115.2 kbps
• Transmission Distance – Up to 5 km (speed-dependent)
• Transmission Medium – Twisted pair or shielded cable
• Electrical Interface – 10-position pluggable terminal blocks (both sides)
• Power Supply – 9–30 V DC, 150 mA
• Operating Temperature – −25 to 70 °C
• Operating Humidity – 5–95% RH
• Maximum Altitude – 3000 m
• Dimensions – 120 × 77 × 40 mm

Ideal For

• Industrial RS-485 networks requiring segment isolation
• Power acquisition and monitoring systems
• Outdoor and electromagnetically noisy environments
• Large-scale RS-485 bus architectures

Package Contents

• 1× Industrial RS-485 Opto-Isolated Hub

Resources

• Instruction Manual (PDF)