4-Port Isolated RS485 Hub & Splitter | Valtoris

Name: 4-Port Isolated RS485 Hub & Splitter | Valtoris - Valtoris Electronics
SKU: IoT-IC104
Price: 39.99 USD
Availability: InStock

Engineered to expand complex serial networks, the Valtoris 4CH-HUB-RS485 is an industrial isolated hub that enables flexible star topologies by actively distributing signals from one master to four independent slave channels. It provides critical 2500V optical isolation and signal repeating to prevent ground loops, neutralize transient surges, and flawlessly safeguard field devices across large-scale industrial data acquisition systems.

Part No. 4CH-HUB-RS485

sku : IoT-IC104

INSTANT QUOTE

Active Repeating & Network Expansion

Standard RS485 networks are strictly limited by physical daisy-chain wiring and maximum node constraints. The Valtoris 4CH-HUB-RS485 bypasses these limitations by acting as an active signal repeater and splitter. It supports reliable RS485 network relaying, allowing you to seamlessly branch out your communication lines and connect extensive field sensor arrays back to a single host PLC.

Flexible Star Topology Architecture

Break free from the traditional linear bus constraints. The isolated master port connects directly to your central RS485 host device. The hub then actively splits and regenerates the signal into 4 independent, isolated RS485 slave branches. This true "Star Topology" dramatically simplifies field wiring and guarantees that a single short-circuit on one branch will never collapse your entire SCADA network.

Industrial Isolation & Surge Protection

Factory floors are electrically hostile environments. Without robust shielding, ground loops and high-voltage transient spikes can travel up a serial line, instantly destroying expensive master controllers. This hub integrates a built-in photoelectric isolation circuit, delivering critical 2500V optical isolation between the master port and all slave branches, alongside 12KV anti-electrostatic protection.

Adaptive Wide Baud Rate Support

Eliminate complex configuration steps. The hub features an intelligent, self-adaptive baud rate detection engine spanning from 300 to 460.8 kbps. It automatically synchronizes with the transmission speed of your host network, ensuring true transparent, plug-and-play operation for legacy automation protocols.

Hardware Dimensions & DIN-Rail Mounting

Designed for rapid deployment inside crowded control panels, the 4CH-HUB-RS485 features an integrated buckle for secure 35mm standard DIN-rail mounting. The ruggedized enclosure protects internal electronics while keeping your complex serial branches neatly organized.

Hub Selection Guide

Model	2CH-HUB-RS485	4CH-HUB-RS485 (This Model)	4CH-HUB-RS232/485	8CH-HUB-RS485
Function	2-channel active caching hub	4-channel expansion isolation hub	4-channel expansion isolation hub	8-channel expansion isolation hub
Uplink (Master Port)	RS485	RS485	RS232 or RS485	RS485
Downlink (Slave Ports)	2 × RS485	4 × RS485	4 × RS485	8 × RS485
Baud Rate	1200 ~ 460.8 kbps	300 ~ 460.8 kbps (adaptive)	0 ~ 200 kbps (adaptive)	300 ~ 460.8 kbps (adaptive)
Optical Isolation	No	2500V (RS485)	2500V (RS485)	2500V (RS485)
Node Capacity	Each RS485 port supports a maximum of 32 nodes

Hardware Interface
Interface Standard	Compliant with EIA/TIA RS485 Standard
Physical Connection	RS485 Pluggable Screw Terminals (2PIN Flange Head)
Dimensions (L x W x H)	121 mm × 72 mm × 34 mm
Communication Performance
Baud Rate	300 ~ 460.8 Kbps (Fully Adaptive)
Operating Mode	RS485 two-wire (A, B), asynchronous half-duplex transparent transmission
Node Capacity	Each RS485 port supports up to 32 nodes
Max Distance	1200 meters (@9600bps); The higher the rate, the shorter the distance
Transmission Medium	Standard parallel cables or shielded twisted-pair (STP)
Power & Environment
Input Power	DC 9V ~ 24V
Optical Isolation	2500V Isolation
Static Protection	12KV ESD Protection
Operating Temperature	-45°C ~ +85°C
Humidity	< 95% RH (Non-condensing)

Does this RS485 hub introduce communication latency that could cause Modbus RTU timeouts?

No. Unlike protocol gateways that buffer and process full data packets, this hub operates strictly at the physical hardware layer (OSI Layer 1 bit-level relaying). The signal regeneration delay is in the nanosecond range. It is virtually invisible to your PLC and will not trigger Modbus timeout or frame gap errors.

How do I handle 120Ω termination resistors in a Star Topology using this hub?

In a star topology, each of the 4 isolated slave branches acts as its own independent RS485 bus. You should place a 120Ω termination resistor only at the farthest end device of each active branch. The hub itself internally handles the master-side biasing and termination for those branches.

Can different slave branches operate at different baud rates or protocols?

No. The hub is a physical signal repeater, not a protocol converter. All devices across the master port and the 4 slave branches must share the exact same baud rate (e.g., 9600 bps) and protocol (e.g., Modbus RTU). If you require protocol conversion or edge parsing, please explore our Cellular Edge Gateways.

Can I cascade multiple hubs to expand beyond 4 branches or extend distance?

Yes. You can cascade hubs by wiring the Master port of a second hub to one of the Slave ports of the first hub. This actively regenerates the signal, granting another 1200m of distance per branch. However, to minimize cabinet wiring complexity for larger SCADA networks, we highly recommend upgrading directly to our 8CH-HUB-RS485 model.

Bypass Daisy-Chain Limits with Star Topologies

The 4CH-HUB-RS485 is an industrial-grade active isolated Hub/Splitter/Repeater designed to shatter the limitations of linear serial wiring.
It expands 1 master RS485 port into 4 independent slave branches, enabling engineers to deploy highly flexible and fault-tolerant star topologies.

Fail-Safe Isolation for SCADA Systems

Features critical 2500V optical isolation between the master and all slave channels, successfully localizing severe electrical faults.
The ruggedized rail-mount case design includes screw terminal power inputs (DC 9~24V) for the ultimate cost-effective solution for data acquisition, IoT gateways and intelligent instrument monitoring in heavy industry.