Advantech BB-USR602 and Advantech BB-USR604

Heavy Duty USB to Serial Converters

  • 2 kV Port to Port Isolation
  • ESD Protection – 8 kV Contact, 15 kV Air
  • Rugged Metal Case & High Retention USB Connector
  • Wide Operating Temperature (-40 to 80°C)
  • Redundant Power Inputs
  • Modbus ASCII/RTU Compatible
  • DIN Rail & Panel Mounting Options


These industrial grade, isolated, USB to serial converters allow you to add two or four RS-232/422/485 ports to your PC. Built to rugged specifications, the BB-USR602 offers 2 kV Port to Port isolation. This means that your upstream PC is isolated from the downstream serial devices and the downstream serial devices are isolated from each other and the upstream PC. Additional features such as a heavy duty metal enclosure with panel and DIN Rail mounting options, high ESD protection, shock and vibration testing, and wide operating temperatures, make them ideal for use in harsh environments. Designed for industrial use, they are also suitable for instrumentation, utilities, and laboratory applications. Full speed (480 Mbps) USB 2.0 support allows connectivity with modern computer technology.

Part Number Description
BB-USR602 USB to Isolated Converter, 2 port
BB-USR604 USB to Isolated Converter, 4 port
Serial Technology
RS-422/485 4-Wire TDA(-), RDA(-), TDB(+), RDB(+), GND
RS-485 2-Wire DATA A(-), DATA B(+), GND
Connector DB9 Male
Data Rate 921.6 Kbps
Isolation 2 kV – Port to Port
Surge Protection +/- 0.5 kV DC Ports, +/- 1 kV Signal Ports
Industrial Bus Modbus ASCII/RTU
Bias 1 KΩ on receive lines in RS-422/485 mode
USB Technology
USB Compatibility 1.1 and 2.0
Speed 1.5, 12, and 480 Mbps
Connector Type B High Retention
(15 N / 3.4 lbs-force withdrawal)
Operating System Windows 2000, XP (32/64 bit), Vista (32/64 bit), 7 (32/64 bit), 8 (32/64 bit), 2003 & 2008 Server (32/64 bit)
Source External (Dual Input)
Power Connector Terminal Block
Locking Barrel Plug
Input Voltage 10 to 48 VDC
Power Consumption USR602 – 3.5 Watts Maximum
USR604 – 4.5 Watts Maximum
Power Green LED
TD / RD (Each Port) Green / Amber LED
Dimensions USR602 13.8x3.5x8.8 cm (5.4x1.4x3.5 in)
Dimensions USR604 20.3x3.5x12.0 cm (8.0x1.4x4.7in)
Enclosure IP 30, Metal
Weight USR602 = 0.38 kg, USR604 = 0.68 kg
MTBF USR602 90,013 hours
MTBF USR604 51,098 hours
MTBF Calc. Method MIL 217F Parts Count Reliability
Operating Temperature -40 to 80°C
Storage Temperature -40 to 85°C
Operating Humidity 0 to 95% Non-condensing
Approvals / Certifications
Emissions FCC Class B, CISPR Class B (EN55022:2006)
CE EN61000-6-2: 2005 (Industrial)
EN61000-4-2: 2008 (ESD) +/-8kV Contact, +/-15kV Air
EN61000-4-3: 2006 (RI) 10V/m, 80-1000MHz; 3V/m, 1.3 to 2.7 GHz
EN61000-4-4: 2004 (EFT Burst) +/-2kV DC power port
EN61000-4-6: 2005 (CI) 10 VRMS, 0.15 to 80 MHz
EN61000-4-8: 2001 (Magnetic) 10A/m, 50Hz & 60Hz

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