Industrial RS232/RS485 to 4-Port RS485 Hub with Isolation

Engineered to expand and protect complex serial networks, this industrial isolated RS485 hub enables flexible star topologies over traditional daisy-chains, providing robust 2500V optical isolation and signal repeating to safeguard legacy field devices across large-scale SCADA data acquisition systems.

Part No. 4CH-HUB-RS232/485
sku : IoT-IC100
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Industrial 1-to-4 RS232 to RS485 Isolated Hub / Splitter

An active isolated hub that expands one RS232 or RS485 master into four independent RS485 slave ports, providing robust network relay, extension, and isolation.

Industrial 4-Port Isolated RS485 Hub overview

Active Signal Repeating & Conversion

Overcome standard serial distance limits. Whether used as a pure repeater or an RS232 to RS485 bidirectional converter, it actively regenerates degraded signals, extending your communication reach up to 1200 meters per branch.

RS485 Active Signal Repeating and Network Expansion

Flexible Star Topology

Break free from linear daisy-chain constraints. The 1-to-4 star topology isolates each slave branch, ensuring a single node short-circuit won't crash the entire SCADA bus.

RS485 Flexible Star Topology Connection Diagram

2500V Isolation & Adaptive Baud Rate

Features 2500V optical isolation to block ground loops, and a plug-and-play engine that automatically adapts to baud rates from 300 to 460,800 bps.

2500V Optical Isolation and 12KV Surge Protection
Adaptive Baud Rate Processing from 300 to 460800 bps

Hardware Interfaces & DIN-Rail Mount

Designed for control cabinets with a standard 35mm DIN-rail buckle, pluggable screw terminals, and clear LED indicators for instant visual diagnostics.

35mm DIN Rail Mounting structure
RS485 Hub Interface Introduction and Terminal Pinouts
4CH-HUB-RS485 Product physical show
Physical CAD Outline Dimensions

Hub Selection Guide

Model2CH-HUB-RS4854CH-HUB-RS4854CH-HUB-RS232/485 (This Model)8CH-HUB-RS485
Function2-channel active hub4-channel isolated hub4-channel isolated hub8-channel isolated hub
Uplink (Master)RS485RS485RS232 or RS485RS485
Downlink (Slave)2 × RS4854 × RS4854 × RS4858 × RS485
Baud Rate1200 ~ 460.8 kbps300 ~ 460.8 kbps0 ~ 200 kbps (adaptive)300 ~ 460.8 kbps
Optical Isolation/2500V (RS485)2500V (RS485)2500V (RS485)

Hardware Interface
Interface StandardCompliant with EIA/TIA RS485 Standard
Physical ConnectionRS485 Pluggable Screw Terminals (2PIN Flange Head)
Dimensions (L x W x H)121 mm × 72 mm × 34 mm
Communication Performance
Baud Rate0 ~ 200 Kbps (Fully Adaptive)
Operating ModeRS485 two-wire (A, B), asynchronous half-duplex transparent transmission
Node CapacityEach RS485 port supports up to 32 nodes
Max Distance1200 meters (@9600bps)
Power & Environment
Input PowerDC 9V ~ 24V
Optical Isolation2500V Isolation
Static Protection12KV ESD Protection
Operating Temperature-45°C ~ +85°C
Star Topology Expansion
  • The 4-port RS485 hub acts as an active splitter and repeater, shattering the limitations of linear serial wiring.
  • It expands 1 master port into 4 independent slave branches, enabling fault-tolerant star topologies for SCADA systems.
Fail-Safe Industrial Isolation
  • Features critical 2500V optical isolation to block ground loops and voltage spikes between the master and slave devices.
  • Designed for plug-and-play use with self-adaptive baud rates and a rugged DIN-rail mount chassis.

 

Technical FAQ

Does this RS485 hub introduce latency that causes Modbus timeouts?
No. It operates purely at the hardware layer with bit-level relaying. The signal regeneration delay is in the nanosecond range, which is completely invisible to your PLC and will not trigger timeout errors.
How do I handle 120Ω termination resistors in a Star Topology?
In a star topology, each of the 4 isolated slave branches acts as its own RS485 bus. You should place a 120Ω termination resistor only at the farthest end device of each active branch.
Can I cascade multiple hubs to expand beyond 4 branches?
Yes. You can cascade hubs by wiring the Master port of a second hub to one of the Slave ports of the first hub, granting another 1200m of distance per branch.
🔌 Wiring & Engineering Guides
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