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Weight: 0.5500 Kgs


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The USB2-H-9004-M adapter is a USB to quad interface RS232 or RS485 level serial UART adapter incorporating FTDI’s FT4232H Hi-Speed USB2.0 (480Mb/s) to quad serial UART interface IC device. The FT4232H handles all the USB signaling and protocols. The adapter is housed in a metal enclosure and provides a fast, simple way to connect devices with an RS232 or RS485 interface to USB.

The integrated electronics of the USB2-H-9004-M utilise the FTDI FT4232H and includes RS485 level shifters and RS232 level shifters plus TXD/RXD LEDs to provide a visual indication of data traffic through the adapter. Selection of RS232 or RS485 signalling is made using DIP switches. Each of the quad channels can be independently configured as either RS232 or RS485.

Flexible mounting allows the USB2-H-9004-M to be used in a variety of applications, from a portable adapter to accompany a laptop to permanent installations in industrial, commercial and retail locations.

The adapter can be independently powered using an external +5V DC (1A) power supply which connects via a 2.1mm jack. It can also be powered from the USB interface if required.

The USB2-H-9004-M adapter requires USB device drivers, available free from These are used to make the USB2-H-9004-M appear as a Virtual COM Port (VCP). This allows existing serial communications software, such as HyperTerminal, to exchange data through the USB2-H-9004-M to a legacy RS485 or RS232 peripheral device.

•    Adds four RS-232 or RS-485 serial ports by connecting to a USB 2.0 Hi-Speed 
•    RS-485 Echo and non-Echo modes selection.
•    RS-485 Termination ON and Termination OFF mode selection. 
•    USB2.0 Hi-Speed(480Mbps) interface is compatible with USB 1.1 & 2.0 Host and 
      Hub ports
•    Industry Standard FTDI chip set & device drivers for maximum compatibility 
•    Microsoft Windows® WHQL-certified, Mac OS X, Linux and Windows CE device 
•    Installs as four standard COM or TTY ports 
•    FIFO: 2k byte transmit buffer, 2k byte receive buffer 
•    RS-485 data signals: Data+, Data-, GND 
      o    10MBps maximum 
•    RS-232 data signals: TxD, RxD, DTR or RTS, DSR or CTS, GND
      o    1Mbps maximum
•    Selectable +5VDC Power source from USB port or external power adapter. 
•    +5VDC output at 250mA. (total on 4 ports)
•    Serial Communication Parameters 
      o    Parity: None, Even, Odd 
      o    Data bits: 7, 8 
      o    Flow control: X-ON/X-OFF, None (set in RS485 mode)
      o    Flow control: RTS/CTS , DTR/DSR, X-ON/X-OFF, None(set in RS232 mode)
•    LEDs indicate RxD, TxD and power for monitoring port status.
•    Operating temperature of -40°C to +85°C
•    USB cable of 0.9 meter included
•    FCC and CE approved


Document Type Revision File
Datasheet 1.1 DS_USB2-H-9004-M
Quick Start Guide 1.1 QSG_USB2-H-9004-M