PC/104 - USB Isolated I/O

Advanced Digital Logic, Inc.; 4411 Morena Blvd., Suite 101; San Diego, CA 92117-4345

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. The serial communications are conveniently provided through two

DB9 board mounted male connectors with adjacent LEDs indicating serial port activity.

ENCLOSURE

The USB-IIRO4-2SM includes a rugged steel enclosure with attractive powder coat finish and anti-skid bottom. 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. In addition to the two serial LEDs the unit features

two additional easy-to-read LEDs indicating digital I/O enabled/ready and USB power. Port protocol is configured by opening the enclosure

and configuring jumpers on the circuit board. It is fully compatible with both USB 1.1 and USB 2.0 ports. The OEM version provides just the

board without the enclosure and is ideal for a variety of embedded OEM applications.

OEM USB/104 FORM FACTOR

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 connect-

ing 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. Fu-

ture stacks will be using the extremely fast PCI Express bus which is essentially overkill for simple digital monitoring

and control. The USB-IIRO4-2SM OEM board can also be added into many pre-existing standard PC/104 based systems and enclosures.

High Retention USB Connector

The ever-growing presence of USB in the industrial/military marketplace has driven the need for USB connections to be reliable, dependable,

and unfailing. Gone are the days of loose USB connections. A type B USB connector is used on all USB/104 products which features a high

retention design that complies with the class 1, Div II minimum withdrawal requirement of over 3 pounds of force (15 Newtons). This connec-

tor has an orange color-coded insulator to quickly differentiate it from standard USB connectors. Using these USB connectors increases

reliability in your system and ensures a tight connection. For embedded OEM type applications, an additional miniature USB input header is

provided in parallel with the type B connector.

APPLICATIONS

The industrial I/O market commonly uses electromechanical Form C relays due to their robustness and ability to withstand unexpected surge

currents allowing for increased flexibility in switching capability. These relays are also used where small reed relays are inadequate due to

their susceptibility to contact damage. The USB-IIRO4-2SM with its tiny enclosure and easy connectivity provides portable connections to

laptops for this kind of monitoring and control for the mobile test market. The full USB-IIRO4-2SM unit can be used in the following markets.

Home

Portable and laptop

Education

Industrial Automation and Control

Embedded OEM

Point of Sale (POS) Retail

Data Acquisition

Serial Instrumentation

Laboratory Research

Remote Access