Advantech BB-USPTL4

In-line USB Converter

  • 15KV ESD surge protection
  • Adds a COM port to your PC
  • LEDs for transmit and receive lines
  • USB 1.0, 1.1 and 2.0 compatible (12 Mbps)
  • Automatic configuration on Windows 2000, XP, Vista. 7 (32/64 bit), 8 (32/64 bit)
  • No power supply required (powered from USB bus)


Model BB-USPTL4 is an USB to one port RS-422/485 converters. Supporting 2-wire RS-485 or 4-wire RS-422/485 communications, these devices are great for applications requiring long range or multi-drop capabilities. This model uses pluggable terminal blocks on the RS-422/485 side. Two LEDs indicate data transmit or receive.  The BB-USPTL4 draws power from the USB port so no power supply is required. Simply install the drivers supplied on CD ROM and plug the converter into an available USB port on your computer or USB hub. The device show ups as an additional COM port in the Windows Device Manager, and is compatible with Windows applications.

Part Number Description
BB-USPTL4 Non-isolated RS-422/485 Inline USB Converter
BB-USOPTL4 Isolated RS-422/485 Inline USB Converter
Serial Technology
RS-422/485 4-Wire TDA(-), RDA(-), TDB(+), RDB(+), GND
RS-485 2-Wire DATA A(-), DATA B(+), GND
Connector Terminal block
Data Rate 460.8 Kbps
Isolation 2 kV RMS
Surge Protection 15kV ESD
Industrial Bus Modbus ASCII/RTU
Bias 4.7 KΩ on receive lines in RS-422/485 mode
USB Technology
USB Compatibility 1.1 and 2.0
SPeed 1.5, 12 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)
USB Low power device (draws
LEDs Transmit data, Receive data
Dimensions 8.9 x 4.3 x 2.1 cm (3.5 x 1.7 x 0.8 in)
Enclosure IP 30, Plastic
MTBF USPTL4 1,012,584 hous
MTBF Calc. Method MIL 217F Parts Count Reliability
Operating Temperature 0 to 70°C (32 to 158°F)
Operating Humidity 0 to 95% Non-condensing

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