[USB-039] 4 Channel USB to RS485/422 Converter HuMANDATA LTD.

[USB-039] 4 Channel USB to RS485/422 Converter


4 channel USB RS485/422 Converter

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 USB-039 is a 4 channel USB to RS485/RS422 converter that isolated between each RS-485/422 serial port and a USB port. You can use 4 channels of RS-485/422 serial port from a USB port. Those 4 channels are isolated independently from USB side.
USB-039 has the dip switch to enable and disable the built-in 120 ohm terminal resistor. This is designed around the high performance industry proven FTDI chipset.



  • Supports RS-485/RS422
    2-wire or 4-wire of RS-485/RS422 selectable by the dip-switch
  • Each 4 channels are independent isolation
  • Supports custom baud rate
  • Built-in fail-safe bias resisters
  • Built-in 120 ohm terminal resistor selectable by the dip-switch
  • Pluggable the screw terminal
  • No external power supply is required
    USB-039 is powered through a USB port (Bus-powered)
  • Reliable industrial grade design
  • ESD and surge protection
  • Housing material: Plastic
  • DIN rail and screw mountable (Attachment is required)
  • Includes a USB cable (1.8m)
  • Non-use of 10 Restricted substances of RoHS directive
Eye pattern of upstream tests

Reference data

USB Compliance test
Eye pattern of upstream tests
USB2.0Test Report


Item Description Remarks
Model USB-039  
Input Power DC 5V / Less than 330mA
Supplied through a USB port
No external power supply required
Number of RS-485/422 Port 4  
I/O Interface RS-485/422 (2-wire or 4-wire) ESD protection 
HOST Interface USB 2.0 compliant (Support Hi Speed) USB 1.1 compatible ESD protection 
USB Connector USB B type (Female)  
Isolation Method Bus Isolation  
Isolation Protection Over 2000VDC Designed value
Processor FT4232H FTDI
USB Driver Virtual COM port driver  
Baud Rate 300bps to 250Kbps Support custom baud rate
Data Bits 7 or 8 bit  
Stop Bits 1 or 2 bit  
Parity Even, Odd or No-parity  
FIFO RX Buffer Size 2048 Bytes / ch  
FIFO TX Buffer Size 2048 Bytes / ch  
RX    :Receive data LED x4
TX    :Transmit data LED x4
RS485/RS422 Connector Detachable the screw terminal 5pin (PHOENIX CONTACT) 3.5mm pitch
Support OS Windows 10/8.1/8/7/Vista/XP  
Operating Ambient Temperature -20 to 60℃ (-4 to 140 [°F]) No condensation permitted
Operating Ambient Humidity 30 to 85%RH No condensation permitted
Storage Ambient Temperature -20 to 60℃ (-4 to 140 [°F]) No condensation permitted
Storage Ambient Humidity 30 to 85%RH No condensation permitted
Weight Approx. 250 [g] Only main body
Dimensions 165 x 80.5 x 39 [mm]
(6.496" x 3.169" x 1.535")
Without projections

* Power saving function (suspend, standby, sleep and others) is not supported

Interface Termianl (RS-485/RS422 PIN ASSIGNMENT)

Pin No Signal Direction Notes

A (RD+)

IN Receive data +

B (RD-)

IN Receive data -
3 GND - Signal ground

Y (SD+)

OUT Transmit data +

Z (SD-)

OUT Transmit data -

Package Contents

  • USB-039
  • USB A-B cable 1.8m
  • Driver & Application CD

Price and Optional Accessories

Description MODEL Image List Price (JPY) Stock Status
4 channel USB RS485/422 Converter USB-039 USB-039
Attachment for vertical direction
ACC-027 ACC-027
Attachment for horizontal direction
ACC-028 ACC-028
Attachment for DIN rail type B
ACC-031 ACC-031
Neodymium magnet set
ACC-036 ACC-036
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© HuMANDATA LTD. - Altera & Xilinx FPGA Boards manufacturer in Japan - 2016