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USB to 4-port RS485 / RS422 Converter, Advanced

  • Model: AX104
  • In Stock


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This is a 4-port industrial grade panel-mount USB to RS485 / RS422 converter. With its metal housing and panel mounting holes this converter is ideal for factory environments and most other industrial and commercial installations.

This USB to RS485 / RS422 converter has 4 serial COM ports and is powered through the included USB cable so no external power supply is required, however an external 5VDC 1A power supply can easily be connected if needed.

With DIP switches the user can select between 2-wire RS485 or 4-wire RS422; or the converter can simply be set to auto-detect which signal is connected to the interface.

A nice feature of this converter is that each individual port can be set to either RS485 or RS422 which means that you can use RS485 and RS422 simultaneously.

LED lights for TX and RX makes it easy to determine when data is present which is a great help when troubleshooting.

After installing the included drivers a virtual COM port automatically shows up in your computer's Device Manager which can be used as if it was a standard built-in COM port.

This USB to RS485/422 converter is designed around the high performance industry proven FT4232HL processor from FTDI which ensures optimum reliability and performance.

Overall features
  • Panel mount industrial grade converter
  • Supports 2- and 4-wire RS485 / RS422
  • Fail-safe bias resistors
  • Automatic send data control
  • Auto detection of data speed
  • Built-in terminal resistor (jumper)
  • Indication LED lights for TX, RX
  • USB cable included

Useful optional accessories
(not included)

db9 terminal board
Terminal board

Null modem adapter
Null modem adapter

DB9 to RJ45 adapter
DB9 - RJ45 adapter

DB9 gender changer
Gender Changer

Part number AX104
Operating system
  • Windows 11, 10, 8.1, 8 (32/64-bit), Windows Server 2016, Windows Server 2012 / R2, Windows 7 (32/64-bit), Windows Server 2008 R2, Vista (32/64-bit), Windows Server 2008 (32/64-bit), XP, Windows Server 2003 (32/64-bit), 2000, (all WHQL compliant). Windows RT as D2XX drivers only.
  • Windows CE v4.2 - 5.2, 6.0, 7.0 and 2013 including: Windows Mobile 2003, 2003 SE, Windows Mobile 5, 6, 6.1 and 6.5
  • Linux (built into kernel 3.0.0-19 and above)
  • Mac OS 8, OS 9, OS X 10.3 to 10.9 and above
  • Android
Processor FT4232HL
Unique chipID no. Yes, each converter has it own unique ID number which can be accessed by the user with the D2XX driver programmers guide.
Interface DB9 Male connector
Indication lights Send and Receive
Fail-safe bias resistors Yes
USB interface Standard Type B Female
Ports 4-ports available for RS485 and RS422
  • 2-wire RS485: D+, D-, GND
  • 4-wire RS485: TX+, TX-, RX+, RX-, GND
  • 4-wire RS422: TX+, TX-, RX+, RX-, GND
Baud rate 300-921,600bps (up to 3Mbps by using alising)
Parity None, Odd, Even, Mark, Space
Data Bits 7, 8
Stop Bits 1, 2
TX / RX buffer size 256 Byte Transmit Buffer / 128 Byte Receive Buffer
Adjustable USB transfer sizes for TX and RX From 64 bytes to 4096 bytes
Adjustable latency timer 1 to 255 msec
Adjustable read and write timeouts 0 to 10000 msec
Flow Control None, Xon/Xoff, Hardware
COM port accessible by Included virtual COM port drivers or FTD2XX.DLL
Special features
  • Compatible with Modbus RTU/ASCII, BACnet
  • Supports non-standard baud rates
  • Automatic Send Control
  • Built-in terminal resistor (jumper inside unit)
Electrostatic (ESD) protection 600W surge protection, 15KV static electricity protection
Current draw Static: less than 80mA. Dynamic average: less than 150mA
  • 5VDC provided by included USB cable
Interface compliance USB1.1,2.0,3.0, EIA/TIA
Regulatory compliance FCC, CE and RoHS
Operating temp -13°F to 158°F (-25°C to 70°C)
Size 148 x 60 x 23mm (without screw mounts), 172mm with screw mounts
USB cable length 100 cm
Warranty 1 year limited warranty

For alternative USB to serial RS485 and RS422 solutions please see our full selection of USB to Serial RS485 converters


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