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Quick Details

  • Brand Name: HighTek
  • Model Number: HU-03
  • Place of Origin: Guangdong, China (Mainland)
  • Use: Computer
  • USB Type: Standard
  • Standards:: twisted-pair cable or shielded cable.
  • USB signals:.: VCC DATA+ DATA- GND FG
  • RS-485 signals:: T+, T-, GND
  • RS-422 signals:: T+, T-, R+, R-, GND
  • Transmission interface:: USB A type male connector and DB9 male connector
  • Transmission media:: twisted-pair cable or shielded cable
  • Signal indication:: 3 indicator lights for Power (PWR), Send (TXD) and Receive (RXD)
  • Transmission rate:: 128,000bps to 300M
  • Dimensions:: 1555mm 36mm 16mm
  • Working environment:: -25 to 70 Celsius degree, relative humidity5% to 95%

Packaging & Delivery

Packaging Details 17*12*4cm
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\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\422 equipment.


Performance parameters

Standards: twisted-pair cable or shielded cable.
RS-485 signals: T+, T-, GND.
RS-422 signals:T+, T-, R+, R-, GND.
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 

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 interface:USB A type male connector and DB9 male connector
Transmission distance: 1200 meters for RS-485/422 end (when 9,600bps) and a maximum of 5 meters for USB.
Signal indication:3 indicator lights for Power (PWR), Send (TXD) and Receive (RXD).
Transmission media: twisted-pair cable or shielded cable.
Transmission rate: 128,000bps to 300M.
                    38,400bps to 600M.
                    9,600bps to 1200M.
Dimensions: 1555mm 36mm 16mm.
Working environment: -25 to 70 Celsius degree, relative humidity5% to 95%.
Transmission distance: 0-1200meters (128,000bps-9,600bps)
17. Windows95/98/2000/XP/Vista/Win7/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 RS-485 half duplex
 1 T/R+Sending (A+)  RS-485(A+)
 2 T/R-Sending(B-) RS-485(B-) 
 3 RXD+Receiving(A+) NULL
 4 RXD-Receiving(B-) NULL
 5 GNDGrounding Grounding
 6 N/A  
 7 N/A  
 8 N/A  
 9 N/A  


2.USB-A male: USB output signals and PIN assignment

Communication Connection Chart


1- Standard USB A type male connector

2-  Filter magnetic pole

3- Transparent and shielded standard 2.0 communication line

4-  Fine shell(blue)

5-  Standard DB9 male connector

6-  MCU adopts the product of the TaiWan chip


Problems and troubleshooting

1. Data communication failure

A. Check to make sure USB cable is OK.

B. Make sure RS-485\422 output interface connection is correct.

C. Make sure power supply is OK.

D. Make sure the wire terminal connection is OK.

E. Make sure the indicator lights flash when receiving.

F. Make sure the indicator lights flash when sending.

2. Data missing or incorrect

A. Check to see whether the data rate and format at both ends of the communication equipment are consistent.


Company Information




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