[USB-305] USB RS485/422 Converter (Heavy-duty type) HuMANDATA LTD.

[USB-305] USB RS485/422 Converter (Heavy-duty type)

RoHS10 RS485 RS422 db9 TB HI-SPEED Isolated SurgeProtection Arrester_en.gif
NonChemi-Con Flame-retardant-ABS

USB RS485/422 Converter 避雷素子を実装

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Upcoming Product



  • Supports RS-485/RS422
    2-wire or 4-wire of RS-485/RS422 selectable by the dip-switch
  • 2000VDC bus isolation
  • Built-in arrestors for lightning protection
  • Baud rate up to 250Kbps
  • Supports custom baud rate
  • Auto transmit data control
    Built-in USB-serial chip has auto transmit controller and the driver is activated when it transmit the data
  • Built-in fail-safe bias resisters
  • Built-in 120 ohm terminal resistor selectable by the dip-switch??
  • Pluggable the screw terminal and D-Sub 9-pin connector
  • No external power supply is required
    USB-305 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


Item Description Remarks
Model USB-305  
Input Power DC 5V / Less than 200mA
Supplied through a USB port
No external power supply required
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 FT2232H FTDI
USB Driver Virtual COM port driver  
Baud Rate 300bps 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 1024 Bytes  
FIFO TX Buffer Size 1024 Bytes  
RX: Receive data LED
TX: Transmit data LED
RS485/RS422 Connector (CN1) Detachable the screw terminal 5pin (PHOENIX CONTACT) 3.5mm pitch
***Connector (CN2) D-SUB 9pin Male (#4-40 UNC) Exchangeable to attached optional M2.6 screws
避雷素子(アレスタ) ・直流放電開始電圧100V/s(±20%):90V
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. 120 [g] Only main body
Dimensions 69 x 82.5 x 30 [mm]
(2.638" x 3.248" x 1.181")
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
1 A (RD+) IN Receive data +
2 B (RD-) IN Receive data -
3 GND - Signal ground
4 Y (SD+) OUT Transmit data +
5 Z (SD-) OUT Transmit data -

Pin No Name Direction Notes
1 RD+ IN Receive data +
2 RD- IN Receive data -
3 SD+ OUT Transmit data +
4 SD- OUT Transmit data -
5 GND - Signal ground
6 (GND) - (Signal ground)
7 (GND) - (Signal ground)
8 (GND) - (Signal ground)
9 (GND) - (Signal ground)
CASE FG2 - Frame Ground
(Connected to GND)

D-sub 9 pin male connector
#4-40 UNC screws are mounted by factory setting. You can change them to attached M2.6 screws.

Package Contents

  • USB-305
  • USB A-B cable 1.8m
  • Driver & Application CD

Price and Optional Accessories

Description MODEL Image List Price (JPY) Stock Status
USB RS485/422 Converter (Heavy-duty type) USB-305 USB-305
Attachment with clamping screw
PEN-003 PEN-003
Attachment for 35mm DIN rail
Attachment with neodymium magnet
PEN-003-MG PEN-003-MG
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