The Waveshare RS485-HUB-4P is an industrial isolated 4-port RS485 hub designed to expand one RS485 master port into four sub-ports with isolation and signal relay. It’s a cost-effective and rail-mountable solution for extending RS-485 networks in industrial automation, IoT gateways, and data acquisition systems.
The hub supports a wide baud rate range from 300 to 460,800bps (self-adaptive) and up to 32 nodes per port, for reliable long-distance communication up to 1200 meters at 9600bps. It operates in two-wire half-duplex transparent transmission mode and accepts a 7V–36V DC power supply via terminal input.
4-port Industrial RS-485 Hub Interface
4-port RS-485 Hub Connection Diagram
Built with optoelectronic isolation between master and sub ports, it provides robust protection against electrostatic discharge, lightning, and surge interference. The device includes status indicators for power and data transmission on both master and sub ports and supports standard parallel or twisted-pair cabling.
Housed in a 35mm DIN rail-mount enclosure and measuring 121 × 72 × 34 mm, the RS485-HUB-4P can operate in temperatures ranging from -45°C to +85°C and humidity below 95%. All these features make this device suitable for industrial automation, IoT gateways, and instrumentation systems requiring reliable network extension and isolation.
In terms of software support, the RS485-HUB-4P does not require special drivers or configuration software, as it operates in transparent transmission mode compatible with standard RS-485 communication protocols. Waveshare provides detailed documentation, wiring diagrams, and setup guides on its official Waveshare’s wiki page to assist with installation and integration into various systems.
The Waveshare 4-Port Industrial RS-485 Hub is available on the Waveshare store for $17.99; it’s also available on AliExpress for $20.85, and at the time of writing, there is a 5% discount going on. It’s also available on Amazon for $48.99.
Sayantan Nandy 
Niladri Chowdhury