#{ '$' + (selectedVariant.price/100).toFixed(2) } $49.95

RS485 USB Adapter w/RS422 to USB Support - BF-850

0 star rating Write a review


MPN: BF-850

QTY: #{item['option'+item.qtyIndex]}

Price Each: $#{ ((item.price)/100).toFixed(2) }

Save: #{ (((item.compare_at_price - item.price)/item.compare_at_price)*100).toFixed(2) }%

Delivery: Ships same or next business day

Availability: in stock

30 day Money Back Guarantee *Some Exceptions Apply

Warranty: 1 year Comprehensive support for all products

Authorized North America Distributor Stamp

The RS485USB is a RS485 USB Cable designed to provide instant Serial port expansion via the Universal Serial Bus (USB) for your Notebook PC, workstation, thin client, or server. The RS485USB includes support for RS422 to USB. The RS485USB is compatible with new and legacy RS422/485 devices. Easy to install and use without turning your PC’s power off, the RS485USB provides the scalability to quickly adapt to new USB technologies.

There is a unique I/O electric auto-control to control the direction of data transfer. No handshake signal is needed to transfer full duplex (RS422) or half duplex (RS485).

The BF-850 can be used in point to point or point to multipoint applications. In point to multipoint use, each unit adapter can connect up to 32 RS422 or RS485 interface devices.

A complete product line offers many choices to help you to expand and make your network grow with your requirements. With the USB Plug-and-Play feature, you simply plug in, follow the instructions of Install Wizard, and then you are done. You don’t have to deal with Card Slots, I/O address, IRQ jumpers, DMA and others when you are connecting the devices. The System will recognize the device and install the drivers automatically.

The RS485USB is an ideal solution for your expanding applications.

  • One RS422/485 Port over USB Port
  • Easy Serial Port Expansion over USB Port
  • Supports 4-wire RS422 and 2-wire RS485 applications
  • Supports RS485 Auto Transceiver Turn Around
  • Supports USB Bus Power
  • Hot Swappable and Plug-and-Play Features
  • Compact Size for Critical Applications
CHARACTERS T 7 or 8 data bits
CONNECTION MODES USB1.1 and USB2.0 Backward Compatible
CONNECTORS DB9/6 Screw Terminal Block
DATA RATES T 300 baud up to 921.6 Kbps
DIMENSIONS 55 x 36 x 18 mm
INTERFACES 2 modes are selectable: 4-wire RS422 (TXD+/-, RxD+/-), 2-wire RS485 (Data+/-)
MPN BF-850
PARITY odd, even, none
PROFILES Serial Port Profile (SPP)
STOP BITS 1 or 2
SUPPORTED OS Supports Windows (Win98SE, ME, 2000, XP, 2003, 2008, Vista, 7)
  • Operating: -25°C to +70°C
  • Humidity: 5% to 90 % (non-condensing)


BF-850 User Manual View (PDF)


BF-850 Driver Download (rar)

Tech Support

We have the best technical support engineers that know how to use our products. If our Tech Support cannot solve your problem, we will contact the design engineer or manufacturer to help find a resolution.