The USB-DIO-32 is an ideal solution for adding portable, easy-to-install digital I/O and counter capabilities to any computer with a USB port. The USB-DIO-32 is a USB 2.0 device, offering the highest speed available with the USB bus. It is fully compatible with both USB 1.1 and USB 2.0 ports. The unit is plug-and-play allowing quick connect or disconnect whenever you need additional I/O on your USB port.

The USB-DIO-32 features 32 bits of TTL-compatible digital I/O with high-current capabilities and three optional 82C54 counters. Each digital port can be programmed to accept inputs or to drive outputs on four 8-bit ports, designated as port A, B, C, and D. Power is supplied to the unit via the USB cable or for higher current capabilities, external power may be used. The I/O wiring connections for USB-DIO-32 are via an industry standard 50-pin connector. For external circuits, fused 5VDC power is available at the connector. This resettable fuse is rated at 0.5A.

All I/O lines are buffered by a type 74ABT245 tristate buffer transceiver capable of sinking 64 mA or sourcing 32 mA. The buffers are configured under program control for input or output. Pull-ups (to 5 VDC) or pull-downs (to ground) on the board allow for contact monitoring and assure that there are no erroneous outputs at power-up until the module is initialized by system software.

Unlike most USB digital I/O products which primarily use a human interface device (HID) driver, ACCES offers an easy to use, Windows-based, custom function driver optimized for maximum data throughput. This approach exposes the full functionality of the hardware along with maximizing the advantage of using the high-speed USB 2.0 bus.

 

OEM USB/104 FORM FACTOR

The USB-DIO-32 is designed to be used in rugged industrial environments but is small enough to fit nicely onto any desk or testing station. The board is PC/104 sized (3.550 by 3.775 inches) and ships inside a steel powder-coated enclosure with an anti-skid bottom. The OEM (board only) version is perfect for a variety of embedded applications. The board features pre-drilled mounting holes and can be installed using standoffs inside most enclosures or systems. PC/104 systems can easily add this module to an existing stack using the conveniently sized PC/104 mounting holes.

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 lose USB connections. A type B USB connector is used on all ACCES 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 connector 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

• Home
• Portable
• Laptop
• Education
• Laboratory
• Industrial Automation
• Embedded OEM

COUNTER/TIMERS

Three 82C54 chips each include three 16-bit counter/timers factory configured in an optimal module for use as event counters, frequency output, pulse width, and frequency measurement (see the Block Diagram).

ACCESSORIES

The USB-DIO-32 is available with optional cable assemblies, screw termination boards, and an optional external AC/DC power supply. The pin connections are also compatible with industry standard I/O racks such as ACCES A24A, OPTO22, Gordos, Potter & Brumfield, etc. with optional cable.

SOFTWARE

The USB-DIO-32 includes a free Windows 98se/Me/NT/2000/XP/2003 compatible software package. This 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.

Specifications

Digital Inputs (TTL Compatible)

• Logic High: 2.0 to 5.0 VDC
• Logic Low: -0.5 to 0.8 VDC

Digital Outputs

• Logic High: 2.0 VDC min., source 32 mA
• Logic Low: 0.55 VDC max., sink 64 mA

Optional Counter/Timers

• Type: 82C54-10 programmable interval counters
• Output Drive:
  • 2.0 VDC min., source 32 mA
  • 0.55 VDC max,. sink 64 mA
• Input Gate: TTL/CMOS compatible
• Clock: On-board, 3 MHz crystal-controlled clock
• Active Count Edge: Negative Edge
• Minimum Clock Pulse Width: 30 nS high, 40 nS low
• Timer Range: 16 bits
• Maximum Input Frequency: 10MHz

Environmental

• Operating Temperature Range: 0° to 70°C
• Storage Temperature Range: -40° to 85°C
• Humidity: Maximum 90% RH, without condensation
• Board Dimension: 3.550 x 3.775 inches
• Box Dimension: 4.00 x 4.00 x 1.25 inches

Power

• 5VDC provided via USB cable up to 500mA**
• Basic Unit with Three Counters: 80mA typical (no load)

**optional external power supply can be ordered if the SOURCE current from the USB-DIO-32 is expected to be greater than 420mA (80mA 420mA = ~500mA)

Connector Pin Assignments

USB-DIO-32 has a 50-pin connector provided for I/O connections. Connector pin assignments are listed below.

Assignment		Pin	Assignment		Pin
Port C	PC7	1	Counter A0 Freq In		2
Port C	PC6	3	Ctr A1 P.W.I. (Gate)		4
Port C	PC5	5	Counter A2 Freq Out		6
Port C	PC4	7	Counter B0 Freq In		8
Port C	PC3	9	Ctr B1 P.W.I. (Gate)		10
Port C	PC2	11	Counter B2 Freq Out		12
Port C	PC1	13	Counter C0 Freq In		14
Port C	PC0	15	Ctr C1 P.W.I. (Gate)		16
Port B	PB7	17	Ctr C2 Freq Out		18
Port B	PB6	19	Port D	PD7	20
Port B	PB5	21	Port D	PD6	22
Port B	PB4	23	Ground		24
Port B	PB3	25	Port D	PD5	26
Port B	PB2	27	Ground		28
Port B	PB1	29	Port D	PD4	30
Port B	PB0	31	Ground		32
Port A	PA7	33	Port D	PD3	34
Port A	PA6	35	Ground		36
Port A	PA5	37	Port D	PD2	38
Port A	PA4	39	Ground		40
Port A	PA3	41	Port D	PD1	42
Port A	PA2	43	Ground		44
Port A	PA1	45	Port D	PD0	46
Port A	PA0	47	Ground		48
Fused 5 VDC	.	49	Ground		50

Regulatory Compliance

• This product is designed to be in full compliance with CE requirements.