Isolated RS232/RS422/RS485 USB serial Hub


  • 2 or 4 ports 3-in-1 serial interface : RS232/RS4522/RS485 (1500V isolation)
  • Data rate from 300 Kbps to 3 Mbps on each port
  • RS485 automatic line direction control
  • Support for 4-wire RS422/RS485 and 2-wire RS485
  • Independent TxD & RxD signalling for each port
  • USB bus powered or from an external power source (+9VDC to +36VDC)
  • Hot “Plug & Play” support, USB 2.0 full speed and USB 1.1 compliant
  • Standard COM ports full compatible
  • 15 KV ESD protection and HF filtering
  • Robust  & compact metal case, CE standards, cabinet or 35 mm Din Rail mounting


This new range of serial to USB solution (USBPort/x) offers performance, simplicity of installation, security, robustness and high reliability at affordable prices.


USBPort/x is proposed in two models : 2 and 4 isolated port with 3 in 1 serial interface RS232, RS422 & RS485 in order to cover all technical requirements of industrial environments.


USBPort/x installation is quite simple as the product is instantly plug & play, it doesn't require any IRQ, DMA or I/O port resources.

Installed serial ports are considered by Windows 2000, 2003, XP, VISTA, SEVEN & Linux operating systems as computer's standard COM ports.


USBPort supports up to 3 Mbps over the serial link. A decimal divider makes it possible the program non-standard highly accurate baud-rates.


Technical characteristics





2 or 4 RS232 / RS422 / RS485 asynchronous serial ports for USB 2.0




RS signals


RS232 mode : TxD, RxD, RTS, CTS, DCD, DTR, RI & GND
RS422 mode : A, A’, B, B’ & GND - RS485 mode : AA’, BB’ & GND






Asynchronous 5, 6, 7 or 8 bits per character 1, 11/2, 2 stop bits

Even, odd, mark, space or no parity




Data rate


From 300 Kbps to 3 Mbps on each port






TX: 128 bytes, RX: 384 bytes on each port






Hardware hand-shake (RTS/CTS) and/or software hand-shake (XON/XOFF) with automatic line direction control in the RS485 mode.




RS connectors


5-point screw-in terminal for each RS422/RS485 port, male SUB D9 connector for RS232






15KV ESD protection with HF signal filtering, CE standards






1500Vrms optic isolation on RS422/RS485 serial ports






2 LEDs per port to monitor TxD & RxD signals activity, one LED for power supply




Power supply


USB bus powered of from an external power source (+9 to +36VDC) on jack or Phoenix connector. USBPort/x enables to chain other USB devices and thus power other USB equipments from the product.




Operating systems



Windows 2000, 2003, XP, VISTA, SEVEN and Linux (please consult us for other OS)





2.5W for the 2-port version, 3.5W for the 4-port version






"Plug & Play" equipment, quick & easy Windows installation, RS232 / RS422 / RS485 mode, polarization and line termination are switches configurable






NF EN 55022 residential emission, NF EN 61000-6-2 industrial immunity






Operating temperature from -40°C to +70°C, storage -40°C to +80°C, 0 to 95% relative humidity without condensation






Metal case for panel mounting, 35 mm Din Rail mounting accessories available optionally






USBPort/2: 168 mm (L) x 112 mm (W) x 26 mm (H)

USBPort/4: 168 mm (L) x 112 mm (W) x 42 mm (H)






445 g for the 2-port version, 610 g for the 4-port version



Technical documentation

Drivers - softwares - firmwares

References to order





Isolated 2-port RS232/RS422/RS485 serial Hub, power from USB bus or from an external power source +9VDC to +36VDC, 2 meter USB type A/B cable provided






Isolated 4-port RS232/RS422/RS485 serial Hub, power from USB bus or from an external power source +9VDC to +36VDC, 2 meter USB type A/B cable and PWS-12 supplied



Accessories :




Optional external power adapter 220VAC ↔ 12VDC (12W) for USBPort/2 (required when chaining several devices on the same USB port or when the USB HUB delivers less than 500 mA)