DFRobot
Industrial RS485 Opto-Isolated Hub
A 4-port RS-485 bus hub with optical isolation and surge protection, designed for industrial environments with complex electromagnetic interference. Each por...
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
Jargon buster
Plain-language definitions for the technical terms used above.
- E1
- A Galileo satellite signal band used for standard positioning. Knowing which signal bands are supported helps you judge compatibility and expected performance of a GNSS receiver.
- electromagnetic interference
- Electromagnetic interference is unwanted electrical noise from nearby devices, cables, or radio signals that can disturb a signal in a wire. Shielding helps reduce this noise, which matters for network adapters because cleaner signals are less likely to cause unreliable connections or data errors.
- ESD protection
- ESD protection helps protect electronics from damage caused by static electricity discharges. It is useful on development boards because cables, sensors and modules are often plugged and unplugged during prototyping.
- RS-232
- An older serial communication standard that uses higher signal voltages than modern microcontroller logic pins. If you are connecting this breakout to a microcontroller, you may need an RS-232 interface or level converter rather than wiring it directly.
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