[USB-503] USB to RS485 Converter Compact HuMANDATA LTD.

[USB-503] USB to RS485 Converter Compact

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Compact isolated USB RS-485 Converter

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USB-503 is a USB to RS485 converter that can use RS-485 from USB interfaces. This is an insulation type that can be used safely even in the FA environment.



  • Supports RS485 (Half Duplex)
  • 2000VDC bus isolation
    USB side and RS-485 side are isolated
  • Baud rate up to 250Kbps
    High-speed type USB-010 (MAX 12Mbps) is also available
  • 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
  • Termination resistance setting switch
  • Pluggable the screw terminal
  • No external power supply is required
    USB-503 is powered through a USB port (Bus-powered)
  • Reliable industrial grade design
  • ESD and surge protection
    CE-certified USB-003 is also available
  • Housing material: Plastic
  • DIN rail, magnet, 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-503  
Input Power 5VDC
Supplied through a USB port (Bus-powered)
No external power supply required
Current Consumption Less than 80 mA  
I/O Interface RS485 ESD protection ESD_15kV
HOST Interface USB 2.0 compliant
Support Full Speed
USB 1.1 compatible
ESD protection
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, No-parity  
FIFO RX Buffer Size 384 bytes  
FIFO TX Buffer Size 128 bytes  
Isolation Method Bus Isolation  
Isolation Protection 2000VDC Designed value
Processor FT232BL FTDI
USB Driver Virtual COM port driver  
Support OS Windows 10/8.1/8/7  
LED PWR: USB bus power
RX: Receive data
TX: Transmit data
USB Connector Standard Type B Female  
RS485 Connector Pluggable the screw terminal 3pin (PHOENIX CONTACT) 5mm pitch
Operating Ambient Temperature -10 to 60℃ (14 to 140 [°F]) No condensation permitted
Operating Ambient Humidity 10 to 85%RH No condensation permitted
Storage Ambient Temperature -20 to 55℃ (-4 to 131 [°F]) No condensation permitted
Storage Ambient Humidity 10 to 85%RH No condensation permitted
Weight Approx. 70 [g] Only main body
Dimensions 67 x 43.5 x 27 [mm]
(2.638" x 1.713" x 1.063")
Without projections

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

RS485 Connector pinouts

Pin No Signal Signal and Polarity
1 A SD/RD +
2 B SD/RD -
3 GND Signal ground

Package Contents

  • USB-503
  • USB cable 1.8m
  • Driver & Application CD

Price and Optional Accessories

Description MODEL Image List Price (JPY) Stock Status
USB to RS485 Converter Compact
USB-503 USB-503
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
1757022 (Phoenix)
(Additional purchase)
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© HuMANDATA LTD. - Altera & Xilinx FPGA Boards manufacturer in Japan - 2016