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1-Port RS422/485 USB-to-Serial Adapter


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USB-COMi+2 Products Manual Download

Compliance USB 1.0/1.1 compliant, USB 2.0 compatible
Speed 12 Mbps, full-speed USB
FIFO 128 byte transmit FIFO
384 receive FIFO
Serial Interface
Port Type RS-422/RS-485 selectable
Number of Ports 1
Connectors DB9 male
Serial Line Protection
ESD Protection 10KV
Serial Port Speed
Baudrate 300 bps to 921.6k bps
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
Flow Control RTS/CTS, XON/XOFF
Serial Signals
RS-422 TxD-(A), TxD+(B), RxD+(B), RxD-(A), GND, RTS-(A), RTS+(B), CTS+(B), CTS-(A)
RS-485-4 wire TxD-(A), TxD+(B), RxD+(B), RxD-(A), GND
RS-485-2 wire Data-(A), Data+(B), GND
Driver Support
OS Windows 7, Vista, 2003, XP (WHQL certified) and 2000
Linux Kernel 2.4 and up built-in support
Power Supply
Input Bus-powered
No external power adapter required
Chassis Plastic, ABS
Operating Temperature 0 to 55 °C (32 to 131 °F)
Operating Humidity 5 to 95% RH
Storage Temperature -20 to 75 °C (-4 to 167 °F)
Safety Approvals EN55022 Class B, EN55024, EN61000-3-2, EN61000-3
IEC 61000-4-2, IEC 61000-4-3, IEC 61000-4-4, IEC 61000-4-5, 
IEC 61000-4-6, IEC 61000-4-8, IEC 61000-4-11. 
CISPR PUB. 22 and FCC Part 15 Class B.



Download FTDI Virtual COM Port (VCP) Drivers for Windows, MAC OS X and Linux


The ES-U-2001-S is a 1 port RS422/485 USB to serial adapter. This adapter includes an EasyMode setting by hidden DIP switch. The ES-U-2001-S offers terrific value and convenience with no need to open chassis to set operation modes, the upper case can be slid open for easy RS422, RS485 mode settings.



  • Adds one RS-422 or RS-485 serial port by connecting to a USB port

  • One DB9 male connector

  • No need to open chassis to set operation modes- upper case can be sliding open for easy RS-422, RS-485 mode settings

  • Installed as standard Windows COM port

  • RS-422 data signals: TxD-, TxD+, RxD+, RxD-, GND, RTS-, RTS+, CTS+, CTS-

  • RS-485 4-wire data signals: TxD-, TxD+, RxD+, RxD-

  • RS-485 2-wire data signals: Data-, Data+

  • Automatic transmit and receive control for 2-wire RS-485 half-duplex mode

  • Built-in termination and biasing

  • High speed serial port with the baud rate up to 921.6K bps

  • Non-standard baudrates supported

  • LEDs of Power, TxD and RxD for easy port monitoring and diagnostic

  • Serial port protected with surge protection of 10KV

  • Powered by USB port, no external power adapter required

  • Easy plug and play installation and RS-422/RS-485 device connection

  • COM port number assigned can be changed to any COM port number required

  • Works with USB 1.1 & 2.0 host port

  • Supports Windows 10, 8, 7, Vista, XP, 2000, ME, 98, Mac-OS8, 9, X and Linux