Industrial Active 2-Ch Cache-type RS485 Hub

Engineered to resolve multi-host serial communication conflicts, this industrial cache-type RS485 hub efficiently routes data between two masters and one slave (or vice versa). It features independent baud rate configurations and advanced data filtering to ensure seamless telemetry integration and data integrity within complex SCADA networks.

Part No. 2CH-HUB-RS485
sku : IoT-IC103
INSTANT QUOTE

Primary function

Supports RS485 network relay, 2 master and 1 slave / 1 master and 2 slaves

Connection diagram

Each RS485 channel is independent, and the serial port parameters can be set independently

Rail-Mount Support

Supports 35mm standard guide rail with rail-mount buckle, easy to install.

Interface introduction

Product Show

Outline dimensions

Hub Selection Guide

Model

2CH-HUB-RS485

4CH-HUB-RS485

4CH-HUB-RS232/485

8CH-HUB-RS485

Product Brief

2-channel active RS485 caching hub

4-channel active RS485 expansion isolation hub

4-channel active RS485/232 expansion isolation hub

8-channel active RS485 expansion isolation hub

Physical interface

RS-485 port 3PIN flange head*3

RS-485 port 2PIN flange head*5

RS-232C end DB9 female head (hole type)*1, RS-485 port 2PIN flange head*5

RS-485 port 2PIN flange head*9

Transmission rate

1200~460800bps

300-460800bps (adaptive)

0~200Kbps (adaptive)

300-460800bps (adaptive)

Isolation protection

/

Isolation voltage RS485 Isolation voltage: 2500V  Static protection RS485: 12KV

Isolation voltage RS485 Isolation voltage: 2500V  Static protection RS485: 12KV

Isolation voltage RS485 Isolation voltage: 2500V  Static protection RS485: 12KV

Interface parameters

Data bit 8  Check bits None/Odd/Even/Mark/Space
Stop position 1/2

Support nodes

Each RS485 port supports a maximum of 32 nodes

Transmission distance

RS232C：15m; RS485: 1200 meters (at 9600bps); The higher the communication speed, the shorter the distance

Transmission medium

Ordinary wire, twisted pair or shielded wire

Working method

Asynchronous half duplex

Power consumption

DC9-24V 12V@30mA

Operating Temperature

-45℃~+85℃

Humidity

<95%RH

Size（Length x Width x Height）

121mm * 72mm * 34mm

Interface standard

Compliant with RS485 standard

Physical interface

RS485 screw terminals

Baud rate

1200~460800

supported nodes

Each RS485 port supports up to 32 nodes

Communication distance

1200m (9600bps), the higher rate the shorter distance

Operating mode

RS485 two-wire (A, B), half-duplex transparent transmission

Power supply

DC 9~24V

Operating temperature

-45 ~ +85℃

Environment humidity

<95%RH

Transmission medium

Normal parallel cables/twisted-pair cables

The 2CH-HUB-RS485 is an industrial-grade, 2-channel active RS485 caching hub engineered specifically to resolve multi-host data conflicts. In standard RS485 networks, two host devices directly polling the same slave will cause inevitable data collisions. This caching hub independently collects data, identifies the originating master station, and safely routes the telemetry back without data loss.

Core Applications & Features

* 2 Masters to 1 Slave Topology: Allows two master stations to simultaneously schedule and read from a single RS485 slave station without data clashing.

* 1 Master to 2 Slaves (Baud Rate Bridging): The three RS485 interfaces are all completely independent. This allows for seamless communication even if the devices are running at different baud rates (1200 to 460800bps supported).

* Advanced Data Filtering: Built-in address mask and whitelist functions allow users to filter station addresses for Modbus reply commands, reducing unnecessary bus load.

* Visual Configuration: Comes with a dedicated “Cache Hub Tool” software for straightforward PC-based parameter management and diagnostics.

Q1: Will the “active caching” mechanism cause severe polling latency or timeout errors on my SCADA system?

A: Nope. 2CH-HUB-RS485 has microsecond queuing at hardware level. When two master stations poll the same slave simultaneously, the hub caches one request instantly and then routes it sequentially in under a second. For normal industrial polling rates (1-2 requests per second for example) this nanosecond delay is totally invisible to the master station. You do not have to change the timeout thresholds on your system.

Q2: Is this hub strictly limited to Modbus RTU, or can I use it with custom serial protocols?

A: The device operates on standard RS485 half-duplex transparent transmission at the physical layer. It seamlessly transmits Modbus RTU as well as most standard serial payloads. However, advanced features like Address Filtering are specifically optimized for Modbus frames. If your project also requires converting these serial protocols to Ethernet TCP, we highly recommend pairing this hub with our [Industrial Modbus RTU to TCP Gateway]

Q3: With independent baud rates across three ports, do I need to configure complex hardware DIP switches in the field?

A: We got rid of the tiny DIP switches for easier field deployment. The device comes with a dedicated Windows based Cache Hub Tool. Connect your laptop to the device via USB to RS485 adapter to visually configure baud rate (1200~460800bps), data bits, parity and whitelist settings for each port independently. Every setup takes effect instantly and needs no coding at all.

Q4: In high-EMI environments, if my two master stations have different ground potentials, will it crash the RS485 bus?

A: We built this hub to eliminate that very risk. All the RS485 ports on the device feature industrial-grade optical isolation and surge protection. This physically decouples the ground loop currents between the master stations and the slaves. Standard shielded twisted-pair (STP) cables give reliable, continuous telemetry in the most severe electrical environments.

📥Documents

[User Manual] Valtoris-2CH-HUB-RS485 User Manual

 

 
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