Opto-Isolated 8-Port RS485 Hub / Splitter (Industrial)


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The HUB-485-8 is a rugged, industrial-grade, optically-isolated, 8-Port RS485 Hub / Splitter, which can be used to expand RS-485 networks by splitting one RS-485 network into eight (star wiring), in turn increasing the maximum number of nodes and the distance covered by an RS-485 network. This industrial opto-isolated RS485 Hub / Splitter operates within a temperature range of -40ºF to 185ºF (-40ºC to 85ºC), features 600W surge protection, 15kV ESD static protection and 2500V opto-isolation circuitry, which effectively protect your RS485 devices from ground loops, noise problems, transient surges, remote lightning and spikes. The unit was designed in such a way that data coming from the input (RS485) will transmit to all eight loops of RS-485 networks. However, each loop of RS485 devices will transmit data back to the input only, thus reducing any possible interference between each loop of the RS485 devices. Also, the failure of any individual loop will not affect other loops, making the RS485 networks more robust and reliable. This RS485 Hub supports standard RS485 devices as well as BACnet and Modbus devices, and it supports data rates up to 115.2K Baud and features data format auto-sensing and self-adjusting. Therefore, it requires no manual settings, software drivers or flow control, making the unit a highly reliable and truly plug-and-play device. A separate external power supply is included in the package, and, thanks to the professional and unique casing design, the product can be mounted directly on a wall, panel or DIN Rail, without a need of using any unsecured DIN-Rail or wall-mount brackets.


CommFront's products quality is ensured by our ISO-9001 quality control system (Cert No. SG12/04213, strictly certified by SGS), and we back our high-quality products with a 5-year replacement warranty and a 30-day risk-free money-back guarantee.


  • Rugged industrial-grade opto-isolated RS485 hub / splitter
  • Expands RS-485 networks by splitting one (1) RS-485 network into eight (8), thus making star-wiring possible for RS-485 networks
  • Supports multi-drop RS485 networks (up to 1,024 [8x 128] nodes)
  • Supports BACnet and Modbus (multiple masters or slaves)
  • Multiple HUB-485-8 can be connected for expanding the RS485 system
  • 2500V optical isolation
  • The failure of any individual loop will not affect the others, making the RS-485 network more robust and reliable
  • 300 to 115.2K Baud operation (auto-sensing & self-adjusting)
  • Direct DIN-Rail (Rack) or Wall / Panel mounting (stackable)
  • External 9 to 60VDC powered (included)
  • Industrial grade enclosed in a rugged, rustless ABS housing
  • Plug and play (hot-pluggable, data format auto-sensing & self-adjusting)
  • Data direction auto-turnaround, no software drivers or flow control is required
  • No DIP switch or jumper settings needed
  • Operating temperature: -40ºF to 185ºF (-40ºC to 85ºC)
  • Built-in 600W surge protection, 15kV static protection and circuit protection
  • Surface Mount Technology manufactured to RoHS and ISO-9001 standards
  • Safety: CE/FCC compliant
  • 5-year manufacturer's warranty


Part Number: HUB-485-8
Compatibility: EIA/TIA RS-485 standards; Supports BACnet and Modbus
Power Source: 9 to 60VDC (External AC to DC power adapter included)
External AC/DC Power Adapter: 12VDC / 1000mA (Input: 100~240VAC 50/60Hz, US type A plug)
Current Consumption: Less than 30mA
Optical Isolation: 2500Vrms (AC, 1 min)
Baud Rates: 300 to 115,200bps (auto-sensing and self-adjusting)
Distance: RS-485: up to 4000ft (1.2km) at 19,200bps
Maximum Number of Nodes: Input: 1; Output: 8x 128 nodes
Connector: 2x 10-way Terminal Block
Surge protection: 600W
Static protection (ESD): Up to 15KV
Mounting: Direct DIN-Rail (Rack) or Wall / Panel mounting (stackable)
Dimensions (H x W x D): 4.9 x 3.6 x 0.9 in (125 x 73 x 33 mm)
Weight: 4.9 oz (140 g) (with terminal blocks)
Operating Temperature: -40ºF to 185ºF (-40ºC to 85ºC)
Operating Humidity: Up to 90% RH (no condensation)





CommFront products are strictly certified by SGS and/or TUV - the Nationally Recognized Testing Laboratories [NRTLs] in North America (approved by OSHA) and the Notified Bodies in the European Union. Learn More




CommFront products are designed and manufactured to ISO 9001 standards. Our quality control system is strictly certified by SGS (Cert No. SG12/04213). Learn More




CommFront products have been proven to be reliable. We back our high-quality products with a 5-year replacement warranty and a 30-day risk-free money-back guarantee. Learn More

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