Back to results...


USB to 4-Port Serial RS-232/422/485
  • Details
  • Specification
  • Order information
  • Speeds up to 921.6kbps simultaneously
  • All required power drawn from USB port
  • PC/104 module size and mounting compatibility
  • Operating temperature: 0°C to +60°C

This flexible serial communications adapter was designed for effective multipoint transmission in any one of three modes on each channel. These modes are RS232, RS422 and RS485 (EIA485) protocol.

OEM USB/104 form factor

The OEM (board only) version is perfect for a variety of embedded applications. What makes the OEM option unique is that its PCB size and mounting holes match the PC/104 form factor (without the bus connections). This allows our rugged USB to quad-serial port board to be added to any PCI-104 or PC/104 stack by connecting it to a simple USB port usually included on-board with embedded CPU form factors such as EBX, EPIC, and PC/104. This is especially important since many newer CPU chipsets do not support ISA and have plenty of USB ports. The USB-FLEXCOM4 OEM board can also be installed using standoffs inside other enclosures or systems.


The USB-FLEXCOM4 is available with optional cable assemblies and screw terminal adapter board ADAP9.


The USB-FLEXCOM4 is plug-and-play which allows quick connect or disconnect whenever you need additional I/O on your USB port. The module utilizes a high-speed custom function driver optimized for a maximum data throughput that is 50-100 times faster than the USB human interface device (HID) driver used by many competing products. This approach maximizes the full functionality of the hardware along with capitalizing the advantage of high-speed USB 2.0. The USB-FLEXCOM4 is supported for use in most USB supported operating systems and includes a free Linux and Windows 98se/Me/2000/XP/2003 compatible software package. This package contains sample programs and source code in Visual Basic, Delphi, C++ Builder, and Visual C++ for Windows. Also incorporated is a graphical setup program in Windows. Third party support includes a Windows standard DLL interface usable from the most popular application programs. Embedded OS support includes Windows Xpe.

Factory options

  • OEM Board only version with no enclosure
  • HDR -OEM with 10-pin headers per port
  • DIN DIN rail mounting bracket
  • RoHS Available in a RoHS compliant version

Technical specifications
Serial Ports Asynchronous
COM A through COM D via four male DB9 connectors
Character length 5, 6, 7, or 8 bits
Parity Even, odd or none
Stop Interval 1, 1.5, or 2 bits
Serial Data Rates Up to 921.6k for RS-422/485 modes, 230.4kbps for RS-232
Receiver Input Sensitivity +200 mV, differential input
Common Mode Rejection +12V to -7V
Transmitter Output Drive Up to 60 mA, with thermal shut down
Bus Type USB 2.0 Full-Speed
USB Connector Type B, high-retention
Embedded USB Connector 5-pin header, Molex part number 53047
Mating connector housing is Molex part number 51021 0500
Power required 5VDC at approximately 110 mA (plus loads up to an additional 240 mA) from USB bus
Board Dimensions 3.550 x 3.775 inches (PC/104 size & mounting)
Box Dimensions 4 x 4 x 1.25 inches

Environmental and physical specifications

Operating Temperature 0°C to +60°C
Storage Temperature -50°C to +120°C
Humidity 5% to 95%, non-condensing
Model Description
USB-FLEXCOM4 USB to four port RS-232/422/485 serial adapter
USB-COM232-4A USB to four port RS-232 serial adapter

Login / Registration
укажите почту
введите пароль
Forgot password?
By clicking «#SUBMIT_NAME»,
you agree to our Privacy Policy
Loading data...
Subscribe to our newsletter
specify your contacts

By clicking «#SUBMIT_NAME»,
you agree to our Privacy Policy

You have successfully subscribed
Now you can receive newsletters