USB-COM-2SM - Two Port USB to Serial Communication Module
• Dual-port serial adapter for USB 1.1 and USB 2.0 host
• Two serial ports, field selectable RS-232/422/485
• All required power drawn from USB port, no external
power adapter required
• Extra downstream USB expansion port
• PC/104 module size and mounting compatibility
• Small (4"x 4"x 1.8") rugged industrial enclosure
• DIN rail mounting provision
• OEM (board only) version with PC/104 mounting holes
and PCB footprint for added flexibility in embedded applications
The USB-COM-2SM is a two-port asynchronous serial communication adapter designed for use with any computer system equipped with a USB port.
Multiple peripherals such as POS, barcode scanners, scales, date-entry terminals, data acquisition modules, and automation equipment can now be
recognized and used on a single USB port. Simply install the included software and connect the unit to your USB port. It instantly provides two RS232, RS-422, or RS-485 serial ports which can be selected on a port by port basis. It is now easier than ever to add serial ports and serial devices to
any application along with easy plug-and-play and hot-swapping features. The unit enclosure is 4 inches wide by 4 inches deep by 1.8 inches high.
The adapter is supplied with a 6 foot USB cable and has two male DB9 connectors with jack-screws for secure cable connections. The DB9 connectors are conveniently located at the front of the unit and feature easy-to-read LEDs indicating serial port activity. The USB connector is located at the
back of the unit and also features a LED for USB status. The USB-COM-2SM is fully compatible with both USB 1.1 and USB 2.0 ports. The OEM
(board only) version provides just the board without the enclosure and is ideal for a variety of embedded OEM applications. An additional USB input
header is provided on the board for OEMs along with a downstream USB port for connecting additional USB devices.
Type FT232 UARTs are used as asynchronous communication elements. This includes 384-byte receive / 128-byte transmit FIFO buffers for high
data throughput and to protect against lost data in multitasking systems. Crystal oscillators located on the card permit precise baud rate capability up
to 230.4K for use in RS-232 mode, using ICL3243 type drivers. Speeds up to 921.6K are achievable using RS-422 & RS-485. The driver/receivers
used are type SP491 which are capable of driving long communication lines at high baud rates. They can drive up to ±60 mA on balanced lines and
receive inputs as low as 200 mV differential signal superimposed on common mode noise of +12V to -7V. In case of communication conflict, the
driver/receivers feature thermal shutdown.
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 digital/serial 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 - especially important since many newer CPU chipsets do not support ISA and have
plenty of USB ports. Future stacks will be using the extremely fast PCI Express bus which is essentially overkill for simple digital monitoring and control. The USB-COM-2SM OEM board can also be added into many pre-existing standard PC/104 based systems and enclosures.
The USB-COM-2SM is available with optional DIN rail mounting provision.
The USB-COM-2SM is plug-and-play which allows quick connect or disconnect whenever you need additional serial ports through your USB port. The
USB-COM-2SM 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 include Windows Xpe. For serial communications the package includes an easy to use
terminal program for testing out your COM ports. Use in other operating systems may also be supported, contact Factory.
Advanced Digital Logic, Inc.; 4411 Morena Blvd., Suite 101; San Diego, CA 92117-4345
Ph. 858 490-0597 F. 858 490-0599; e-mail: [email protected]; web:
Advanced Digital Logic, Inc.; 4411 Morena Blvd., Suite 101; San Diego, CA 92117-4345
Ph. 858 490-0597 F. 858 490-0599; e-mail: [email protected]; web:
Communications Interface
I/O Connections:
Serial Data Rates:
All RS-232 signals are supported and present at the DB9 connectors
RS-422 Data Signals:
Tx+, Tx-, Rx+, Rx-, GND
RS-485 Data Signals:
2-wire: Tx/Rx+, Tx/Rx-, GND
4-wire: Tx+, Tx-, Rx+, Rx-, GND
Jumper selectable termination
Up to 230.4K bps, asynchronous for RS-232
Up to 921.6K bps, asynchronous for RS-422 and RS-485
Compatible with RS-485 specifications - Up to 32 drivers and receivers allowed on line. Driver / Receiver type
Character Length / Parity / Stop Interval:
5, 6, 7 or 8 data bits / Even, odd or no parity / 1, 1.5 or 2 Stop Bits
Receiver Sensitivity:
±200 mV differential input
Common Mode Voltage:
+12V to -7V
Transmitter Output Drive:
6- mA with thermal shutdown
Jumper selectable per channel for RS-485 mode
On-board from factory on transmit lines for RS-422 and RS-485
Bus Type
USB 1.1 Full-speed, USB 2.0 High-speed compatible
Operating Temperature Range:
0º to +60º C
Storage Temperature Range:
-50º to +120º C
5% to 95% RH, non-condensing
Board Dimensions:
3.550 x 3.775 inches.
Box Dimensions:
3.780 x 4.170 x 1.800 inches high.
+5VDC provided via USB bus up to 500mA
5V@ 120mA maximum
0-60mA for each COM channel
Ordering Guide
Enclosure and module with 2 port USB to RS-232/422/485 serial
Board only (No Enclosure)
Din Rail Mounting Kit
DB9 connector external-mounted screw termination board
Advanced Digital Logic, Inc.; 4411 Morena Blvd., Suite 101; San Diego, CA 92117-4345
Ph. 858 490-0597 F. 858 490-0599; e-mail: [email protected]; web: