Advantech BB-USOPTL and Advantech BB-USOPTL4DR-2

Isolated USB/RS-422/485 Converter

  • 3000 Volts optical isolation
  • 15 KV ESD protection
  • USB bus powered
  • RS-422/485 data rates up to 921.6 Kbps
  • High retention USB connector
  • Removable terminal blocks
  • DIN rail mount (panel mount option)


Universal Serial Bus (USB) has become the connectivity workhorse of today’s PCs, replacing the familiar serial port. However, many commercial and industrial devices still use serial interfaces. To connect these devices to modern PCs, you need a simple and reliable conversion solution.

Specifically designed for industrial applications, they offer 3000V optical isolation with 15 KV ESD protection. The slim-line DIN rail mountable enclosure has a small footprint and, since it draws power from your computer’s USB bus, an additional power supply is not required. Simply plug the converter into an available USB port on your computer or USB hub and install the drivers supplied on CD ROM. The device will show up as an additional COM port in the Windows Device Manager which is fully compatible with your Windows applications.

Part Number Description
BB-USOPTL4DR Isolated USB to RS-422/485 Converter, 1 port
BB-USOPTL4DR2 Isolated USB to RS-422/485 Converter, 2 port
Serial Technology
RS-485 2-Wire Data A(-), Data B(+), Ground
RS-485 4-Wire TDA(-), TDB(+), RDA(-), RDB(+), Ground
Connector Removable terminal block, 12 to 28 AWG
Data Rate Up to 921.6 Kbps
Isolation 3000 V optical isolation
Surge Protection 15 KV ESD
USB Technology
USB Compatibility 2.0 (backward compatible)
USB Data Rate 12 Mbps
Connector Type B female, high retention
(15 Newtons / 3.4 lbs-force withdrawal)
Driver CD Windows 2000, XP, Vista, 7 (32/64 bit), 8 (32/64 bit)
Source USB port
Input Voltage 5 VDC
Consumption ~2.5 W (high power device), draws >500 mA
Dimensions 9.7 x 11.9 x 3.1 cm (3.8 x 4.7 x 1.2 in)
Enclosure DIN rail mountable, plastic
Weight 222.3 g (0.49 lbs) with USB cable
Operating Temperature 0 to 70°C (32 to 158°F)
Storage Temperature -40 to 85°C (-40 to 185°F)
Operating Humidity 0 to 95% Non-condensing
MTBF USOPTL4DR 184,556 hours
MTBF USOPTL4DR-2 79,551 hours
MTBF Calc. Method Parts Count Reliability Prediction
Approvals / Certifications
Emissions FCC Class B, CISPR Class B (EN55022:2006)
CE EN 61000-6-1: 2007 Generic Standards for Residential, Commercial and Light Industrial Environments
EN 61000-4-2: 2009 Electro-Static Discharge (ESD)
EN 61000-4-3: 2006 +A1 +A2 +IS1 Radiated Field Immunity (RFI)
EN 61000-4-4: 2012 Electrical Fast Transients-Burst Immunity (EFT)
EN 61000-4-6: 2009 Conducted Immunity

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