[USB-402] 8 channel USB RS485/422 Converter (Independent Isolation) HuMANDATA LTD.

[USB-402] 8 channel USB RS485/422 Converter (Independent Isolation)

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8 channel USB RS485/422 Converter
Each 8 channels are independent isolation

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 USB-402 is an 8 channel USB to RS485/422 converter that isolated between each RS485/422 channel. Also, the 2 port USB connectors have a Hub function. USB Hub ports are not isolated.
USB-402 is that it 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 RS485/RS422
    2-wire or 4-wire of RS485/RS422 selectable by the dip-switch
  • Each 8 channels are independent isolation
  • 2000VDC bus isolation
  • Baud rate up to 250 Kbps
  • Supports custom baud rate
  • Built-in fail-safe bias resisters
  • Auto transmit data control
    Built-in USB-serial chip has auto transmit controller and the driver is activated when it transmit the data
  • USB-402 is powered through a USB port (Bus-powered) or an AC adapter (Self-powered)
  • 2 USB Hub ports(non-isorated)
  • ESD and surge protection
  • Housing material: Plastic
  • DIN rail and screw mountable (Attachment is required)
  • Includes a USB cable (1.8m)
  • Includes an AC adapter
  • Non-use of 10 Restricted substances of RoHS directive


Item Description Remarks
Model USB-402  
Input Power DC 5V / Less than 400mA
Supplied through a USB port
(Bus-powered) or AC adapter
Recommend the use of an AC
adapter for stably supply.
Number of RS485/422 Port 8  
I/O Interface RS485/RS422 (2-wire or 4-wire) ESD protection 
HOST Interface USB 2.0 compliant (Support Hi Speed) USB 1.1 compatible ESD protection 
HOST Connector USB B type (Female)  
Isolation Method Bus Isolation  
Isolation Protection Over 2000VDC Designed value
Processor FT4232H x 2 FTDI
USB Driver Virtual COM port driver  
Baud Rate 300 bps to 250 Kbps 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  
Number of USB Hub Port 2 non-isorated
USB Hub Port Connector USB A type (Female) x 2  
Supplied Current to Target Less than 400mA / ch  
RX    :Receive data LED x8
TX    :Transmit data LED x8
ST      :USB Hub status LED x2
RS485/RS422 Connector Pluggable 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. 400 [g] Only main body
Dimensions 166 x 81.2 x 50 [mm]  
(6.535" x 3.197" x 1.969")
Without projections

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

Interface Termianl (RS485/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-402
  • USB mini-B cable 1.0 [m]
  • AC adapter(DC5V)
  • Driver & Application CD

Price and Optional Accessories

Description MODEL Image List Price (JPY) Stock Status
8 channel USB RS485/422 Converter USB-402 USB-402
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
Detachable 5P Terminal Connector
1840395 (Phoenix)
(Additional purchase)
TB35-USB-5 TB35-USB-5
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© HuMANDATA LTD. - Altera & Xilinx FPGA Boards manufacturer in Japan - 2016