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Quick Details

  • Brand Name: HighTek
  • Model Number: HU-04
  • Place of Origin: Guangdong, China (Mainland)
  • Use: Computer
  • USB Type: Standard
  • USB signals:: VCC DATA+ DATA- GND FG
  • RS-485 signals:: T+, T-, GND
  • RS-422 signals: T+, T-, R+, R-, GND
  • Working modes:: asynchronous, point-to-point or point-to-multipoint
  • Direction control:: adoption of automatic data stream control for automatic recognition
  • Baud rate:: 300-128,000bps
  • Workload ability:: a maximum of 32 RS-422 or RS-485 interface equipment
  • Transmission distance:: 1200 meters
  • Interface protection:: 600W lightning strike and surge protection
  • Interface forms:: USB A type male connector, DB9 male connector

Packaging & Delivery

Packaging Details 53*27*8cm
Delivery Time Shipped in 2 days after payment




With rapid development of computer industry, USB is taking the place of various kinds of traditional low speed 

peripheral interfaces. However, RS-485/RS-422 interface designs are still used in many of the important facilities 

under current industrial environment; therefore, converter is used by many users to implement the data transmission 

from USB of a computer to RS-485/RS-422 equipment.


Performance parameters


conforming to USBV1.1 and 1.0, EIA RS-485 and RS-422, backwards 


RS-485 signals: T+, T-, GND
RS-422 signalsT+, T-, R+, R-, GND
Industrial grade, adopt UK FTDI master chip
Working modes:

asynchronous, point-to-point or point-to-multipoint, 2-line half duplex 

and 4-line full duplex

Direction control:

adoption of automatic data stream control for automatic recognition and 

control of data transmission direction

Baud rate:

300-128,000bps, automatic detection of the transmission rate of the serial

 interface signal

Workload ability:

point-to-multipoint supported a maximum of 32 RS-422 or 

RS-485 interface equipment is supported

Transmission distance:

1200 meters for RS-485/422 end (when 9,600bps) and a maximum of 5 

meters for USB

Interface protection:600W lightning strike and surge protection, 5KV electrostatic protection
Interface forms:USB A type male connector, DB9 male connector for RS422/485 end
Signal indication:3 indicator lights for Power (PWR), Send (TXD) and Receive (RXD)
Transmission media:twisted-pair cable or shielded cable
Transmission rate:15.128,000bps to 300M.
38,400bps to 600M.
9,600bps to 1200M
Working environment:-40 to 85 Celsius degree, relative humidity5% to 95%
Transmission distance:0-1200meters (128,000bps-9,600bps)
Windows95/98/2000/XP/Vista/Win7/8/Linux and IMAG are supported


Connector and signal

RS-485/RS-422 output signals and PIN assignment

DB9 Connector (PIN)


Output SignalRS-422 Full Duplex CablingRS-485 Halfduplex cabling
2T/R -Sending(B-)RS-485(B-)
4RXD -Receiving(B-)Null




















Communication Connection Chart

USB to RS-422 conversion

1. RS-422 point-to-point / 4-line full duplex


2.RS-422 point-to-point / 4-line full duplex

3. Full duplex connection between HU-04 interface converters

USB to RS-485 conversion

1. RS-485 point-to-point / 2-line half duplex

2. RS-485 point-to-multipoint / 2-line half duplex

3. Half duplex connection between HU-04 interface converters


Company Information




Packaging & Shipping






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China (Mainland)
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