This product is RoHS-compliant

Please contact us if you require a non-RoHS version.

Please note, Acces I/O products are often available in an array of different options, of which only a selection will be displayed here. Please contact us for pricing if you require a product option that is not shown on our website.

FEATURES

• 24 channel USB digital I/O module
• High-Speed USB 2.0 device, USB 3.0 compatible
• Two 8-bit & two 4-bit ports each software configurable for input or output
• Field selectable CMOS (+5V) or LVTTL (3.3V) VCCIO signal levels
• CMOS: All 24 I/O lines buffered with 32 mA sink and source
• LVTTL: All 24 I/O lines buffered with 24 mA sink and source
• Two 82C54 counters with all pins available at I/O connector
• Type B USB connector features industrial strength and high-retention design
• Jumper selectable I/O pulled up to 5V for contact monitoring, pulled down to ground or floating
• Jumper selectable power provided via USB cable or external power supply for higher source current capabilities
• VCCIO at connector for general purpose use, protected by polyfuse
• Resettable fused +5VDC outputs per 50-pin connector
• Standard 50-pin IDC header connector with key
• Alternate micro-fit embedded USB header connector
• Compatible with industry standard I/O racks like Grayhill, Opto 22, Western Reserve Controls, etc.
• USB/104 form-factor for OEM embedded applications
• Small, board itself is PC/104 size (3.550"x3.775")
• Custom high-speed function driver (non-HID)
• Rugged, steel, industrial enclosure measures just 4"x4"x1.25"
• Labview VI driver
• Now with Firmware 2.0 features!
• Onboard Watchdog Timer, configurable power-on defaults, digital input debouncing and latching, digital output Pulse Width Modulation (PWM) and Matrix Mapping

The USB-DIO24-CTR6 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-DIO24-CTR6 is a high-speed USB 2.0 device, offering the highest speed available on the USB 2.0 bus. It is fully compatible with both USB 1.1 and USB 3.0 ports. The unit is plug-and-play allowing a quick connection whenever you need additional I/O on the convenience of a USB port.

The board features 24 bits of CMOS/LVTTL-compatible digital I/O with high-current capabilities and two 82C54 counter/timers. Each digital port can be programmed to accept inputs or to drive outputs. Groups of two 8-bit ports and two 4-bit ports are designated as port A, B, CHi and CLo. Power is supplied to the card via the USB cable. For higher current sourcing capabilities, external power may be used. The I/O wiring connections are via an industry standard 50-pin male connector any of our optional terminal block cards. For external circuits, fused +5V (or 3.3V) DC power is available on pin 49 of the connector. The resettable fuse is rated at 0.5A.

All 24 I/O lines are buffered by a type 74LVC8T245 tristate buffer transceiver capable of operating in CMOS (+5V) or LVTTL (+3.3V) modes. The mode is set for all pins simultaneously via an onboard jumper. When using CMOS mode the outputs can sink or source 32 mA. In LVTTL mode the outputs can sink or source 24mA. The 24 bits are divided into four ports: two 8-bit ports (Port A, Port B), and two 4-bit ports (Port CLo, Port CHi). Each port can be configured independently via onboard jumpers for pull-up, pull-down, or no bias. Each port can also be configured independently, via software command, for use as inputs or outputs.

The board is available in two models, one with two 8254 counter/timer chips, and one without. The unit without counters is optimally suited for use with industry standard solid state module mounting racks. Because this version does not place any counter signals on pins normally reserved for Ground, it provides a perfectly compatible 50-pin IDC connection.

The USB-DIO24-CTR6 is designed to be used in rugged industrial environments but is small enough to fit nicely onto any desk or testing station. The board itself is PC/104 sized (3.550 x 3.775 inches, 90mm x 96mm) and ships inside a steel powder-coated enclosure with an anti-skid bottom. A DIN rail mounting provision and extended temperature is available for installation in industrial environments.

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.

Firmware 2.0 Features

Onboard Watchdog Timer. If your application fails to communicate with the device within a specified timeout period (up to hundreds of seconds) the onboard intelligence will change all the output ports and values to the configured "safe" state.

Need a DAC to power up at 1 Volt? Want the digital output port to generate a square wave as soon as the firmware is loaded? Now you can configure the power-on default states for all possible outputs.

Command the onboard intelligence to perform digital input debouncing and latching. Debouncing time constants from hundreds of microseconds to hundreds of milliseconds allows a wide variety of low-pass filtering options. Latching inputs record low- and high-going pulses that your application may otherwise have missed.

PWM allows programmable duty-cycle square wave output on any digital output. MAP is our new Matrix Mapping feature, wherein you can command the onboard intelligence to automagically copy the state of one bit onto another bit, with no computer interaction required.