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USB-AIO Series with 12 or 16-Bit Resolution

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16 Channel, USB Multifunction Analog Input/Output Device


  • High-speed USB 2.0 multifunction DAQ
  • Sustained sampling speeds up to 500kHz
  • 12 or 16-bit resolution A/D converter
  • Flexible, software configured functionality
  • 16 single-ended or 8 differential analog inputs
  • 8 input ranges, 4 unipolar and 4 bipolar, channel-by-channel programmable
  • Autocalibration and oversampling for real-time accurate data
  • A/D starts via software, timer, or external trigger
  • 2 16-bit analog outputs available
  • 16 high-current digital I/O lines
  • 16-bit programmable counter/timer
  • Alternate micro-fit embedded USB header connector
  • USB/104 form-factor for OEM embedded applications
  • Small, (4" x 4" x 1.25") rugged industrial enclosure
  • All required power drawn from USB port, no external power adapter required
  • Type B USB connector features industrial strength and high-retention design


  • External power for high current capabilities
  • Extended temperature and DIN rail mounting provisions
  • OEM version (board only) features PC/104 module size and mounting compatibility
  • 4-20mA or 10-50mA current inputs


The USB-AIO Series offers an ideal solution for adding portable, easy-to-install high-speed analog and digital I/O capabilities to any PC or embedded system with a USB port. These units are USB 2.0 high-speed devices, offering the highest speed available on the USB 2.0 bus. The USB-AIO16-16A is a 16-bit resolution A/D board capable of speeds up to 500kHz for its 16 single-ended or 8 differential analog input channels. Additional features include two 16-bit analog outputs, 16 high-current digital I/O lines, and a programmable 16-bit counter-all packaged in a small, rugged, industrial enclosure. The counter can be configured in a variety of modes and has the ability to use external signals to trigger and control the scanning of its inputs. The unit is plug-and-play allowing a quick connection whenever you need additional I/O on the convenience of a USB port.

These small, compact, multifunction I/O units provide the user with everything needed to start acquiring, measuring, analyzing, and monitoring in a variety of applications. The USB-AIO Series data acquisition boards can be used in many current real-world applications such as precision measurement, analysis, monitoring, and control in countless embedded applications.

These units are designed to be used in rugged industrial environments but are 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.

The boards feature eight standard analog voltage input ranges (independently configured), two factory current input ranges (4-20mA or 10-50mA) and include a data sample buffer.

Analog to digital conversion starts or "A/D starts" are issued one of three ways: Software Start, Timer Start, or External Trigger Start. A/D starts are software configured to be either rising or falling edge. Additionally, A/D starts are software configured to be Single Channel or Scan. Single Channel samples data once from the next consecutive channel within the enabled set. A Scan samples data from all channels within the set at the fastest possible rate.

A fully programmable 8254 16-bit counter is provided with a maximum input frequency of 10MHz. The clock, gate (inputs) and output can be accessed externally for extended functionality. The counter can be configured in a variety of modes and has the ability to use external signals for its inputs.


Advanced calibration models feature a unique real-time internal autocalibration system that allows the card to compensate for offset/gain errors, giving a more accurate reading. To minimize noise, the board offers a technique called oversampling. Additionally, each channel contains its own analog ground pin on the I/O connector which is helpful in reducing noise from external signal sources. The channel-by-channel programmable gain feature enables measurement of an assortment of large and small signals in one scan-all under software control at up to 500kHz. The board's data buffer and ability to trigger the A/D in real time assures synchronized sampling that is unaffected by other computer operations-an essential requirement for signal, vibration and transient analysis where high data rates must be sustained for short periods of time. More information regarding calibration can be found in the product manual.

Each board shipped from ACCES is factory calibrated as part of the production process using a high-quality 7 digit digital voltmeter (DVM) and an extremely stable voltage reference.


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 pre-drilled mounting holes match the PC/104 form factor (without the bus connections). This ensures easy installation using standard standoffs inside most enclosures or systems. The board can be added to any PC/104-based stack by connecting it to a USB 2.0 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-AIO Series OEM boards can also be installed using standoffs inside other enclosures or systems. For embedded OEM type applications, an additional micro-fit USB input header is provided in parallel with the type B connector.


High Retention USB Connector

USBR 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 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 micro-fit USB input header is provided in parallel with the type B connector.


  • Equipment monitoring
  • Environmental measurements
  • Embedded OEM
  • Education/Laboratory
  • Portable
  • Industrial Automation
  • Precision Measurement
  • Analysis, Monitoring, and Control



Available accessories include a wide variety of cables and screw terminal boards for quick and easy connectivity. Also, a DIN rail mounting provision is available.

USB Connectivity


The USB-AIO Series 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 on the advantage of high-speed USB 2.0. The USB-AIO Series is supported for use in most operating systems and includes a free Linux (including Mac OS X) and Windows 2000/XP/2003/Vista/7 compatible software package. This package contains sample programs and source code in Visual Basic, Delphi, and Visual C for Windows. Also provided is a graphical setup program in Windows. Third party support includes a Windows standard DLL interface usable from the most popular application programs, and includes LabVIEW 8.5 VIs. Embedded OS support includes Windows Xpe.




Analog Inputs

ADC Type		Successive approximation
Resolution		12 or 16-bit
Sampling rate
 "16-16A" version	500Ksamples/sec (maximum aggregate)
 "16-16E" version	250Ksamples/sec (maximum aggregate)
 "12-16A" version	500Ksamples/sec (maximum aggregate)
 "12-16" version	250Ksamples/sec (maximum aggregate)
 "12-16E"version	100Ksamples/sec (maximum aggregate)
Number of channels	16 single-ended or 8 differential (software selectable)
Unipolar ranges		0-1V, 0-2V, 0-5V, 0-10V (software selectable)
Bipolar ranges		±1V, ±2V, ±5V, ±10V (software selectable)
4-20mA			Factory installed (optional)
10-50mA			Factory installed (optional)
Calibration Hardware
 "16-16A" version	Two on-board references   calibrated real-time output
 "16-16E" version	Two on-board references
 "12-16A" version	Two on-board references   calibrated real-time output
 "12-16" version	Two on-board references
 "12-16E"version	NONE
System Calibration	Program provided to calibrate entire system
Accuracy		Uncalibrated	0.094% Full-Scale (FS)
			Calibrated(*)	0.0015% FS
Int Nonlinearity Error	0.0046% FS
No Missing Codes	15 bits
Input impedance		1MΩ
A/D Start Sources	Software Start, Timer Start, and External Start Trigger
			(rising or falling edge; software selectable)
A/D Start Enable	Externally supplied (pulled-up; active-high)
A/D Start Types		Single Channel or Scan (software selectable)
Channel Oversampling	0-255 consecutive samples/channel (software selectable)
Overvoltage protection	-40 to  55V
Crosstalk		-60dB @ 500KHz
(*) To achieve best accuracy, one must calibrate to their own standard

Analog Outputs

Number/Type		2/single-ended
Resolution		16-bit
Unipolar Ranges		0-5V*, 0-10V*
Bipolar Ranges		±5V*, ±10V*
Conversion Rate		4kHz per channel
Settling Time		4us typ, 7us max; 1/4 to 3/4 scale to ±2LSBs
Output Current		±25mA per channel

* Factory Options

Digital I/O

Lines			16, programmable as inputs or outputs in groups of 8 (pulled-up)
Input voltage		Logic low:	0V(min) to 0.8V(max)
			Logic high:	2V(min) to 5V(max)
Input current		±20µA (max)
Output voltage		Logic low:	0V(min) to 0.55V(max)
			Logic high:	2V(min) to 5V(max)
Output current		Logic low:	64mA(max) sink
			Logic high:	32mA(max) source


Type			82C54 programmable interval counter
Available Counters	CTR0 (CTR1/CTR2 dedicated to A/D starts)
Input Frequency 	10MHz (max) Int. or ext. supplied (sw select; pulled-up)
Counter size		16-bit
Clock 			Internal 10MHz or Externally supplied
			(software selectable; pulled-up)
Clock Period		100ns (min)
Clock Pulse Width High	30ns (min)
Clock Pulse Width Low	40ns (min)
Gate			Externally supplied (pulled-up; active-high)
Output			External (pulled-up)
Voltage/Current		Same as Digital I/O


Operating Temperature	0° to  70°C, optional -40° to  85°C
Storage Temperature	-40° to  105°C
Humidity		5% to 90% RH, without condensation
Board Dimensions	PC/104 format, 3.550" by 3.775" w/ mounting holes
Power required		 5V at 315mA typical*

*USB 2.0 spec defines a device in terms of a unit load. A unit load is defined to be 100mA. Devices drawing an absolute maximum of one unit load is considered to be low-powered and devices drawing an absolute maximum of five unit loads is considered to be high-powered. Because this spec is not strictly adhered to, it is best to verify the USB port's power capabilities before operation. This card, according to the USB 2.0 spec, is a high powered device. An optional external power supply can be ordered if the USB port cannot support high powered devices.

If using more than a total of 500mA, use optional 5 VDC external power supply and remove VUSB jumper and place jumper on VEXT. Then plug in external power before plugging into USB port . This option will give you a total of 1000mA available.

Included with your board

The following components are included with your shipment:
  • Board installed in labeled enclosure
  • 6' USB cable
  • Software Master CD (PDF user manual installed with product package)
  • Printed USB I/O Quick-Start Guide


Available Reference Manuals

Available Software Downloads

Available Datasheets

Further information about available ACCES Software:

Drivers And Operating Systems
What drivers and other support we provide for various operating systems.

Setup Programs, Samples, And Utility Software
A description of the software package that comes with each ACCES card.

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.

Custom Software Services
A description of some of our custom software offerings. Did you know we offer free programming services to qualifying customers?




Ordering Information

Model Price (USD)
USB-AIO16-16A 728.00
USB-AIO16-16E 568.00
USB-AI16-16A 639.00
USB-AI16-16E 479.00
USB-AIO12-16A 618.00
USB-AIO12-16 488.00
USB-AIO12-16E 428.00
USB-AI12-16A 529.00
USB-AI12-16 399.00
USB-AI12-16E 339.00
USB-AIO16-16A 16-Bit, 500kHz, with real-time autocalibration, 2 analog outputs and 16 digital I/O
USB-AIO6-16E 16-Bit, 250kHz, with software calibration, 2 analog outputs and 16 digital I/O
USB-AI16-16A 16-Bit, 500kHz, with real-time autocalibration and 16 digital I/O
USB-AI16-16E 16-Bit, 250kHz, with software calibration and 16 digital I/O
USB-AIO12-16A 12-Bit, 500kHz, with real-time autocalibration, 2 analog outputs and 16 digital I/O
USB-AIO12-16 12-Bit, 250kHz, with software calibration, 2 analog outputs and 16 digital I/O
USB-AIO12-16E 12-Bit, 100kHz, 2 analog outputs and 16 digital I/O
USB-AI12-16A 12-Bit, 500kHz, with real-time autocalibration and 16 digital I/O
USB-AI12-16 12-Bit, 250kHz, with software and 16 digital I/O
USB-AI12-16E 12-Bit, 100kHz, and 16 digital I/O
STB-68 68-pin screw terminal board $69
STB-68 Kit Used for mounting the STB-68 to the enclosure of both the USB-AI and Fast USB-DIO Series of USB products. Includes STB-68, cable and specialized mounting hardware. $89.00
C68MM-1.75 68-pin male to male SCSI ribbon cable, 1.75 inches long. $19
MP104-DIN DIN rail mounting provision $19
C68PS18L 68-pin SCSI 18" shielded cable $29.00
Model Options: (call for pricing)
-OEM Board only version (no enclosure)
-P External power components and AC/DC adapter
-T Extended Operating Temperature (-40°C to 85°C)
Call 4-20mA or 10-50mA inputs
Call 16 current inputs when factory configured as single-ended
Call 8 current inputs when factory configured as differential
-5U Analog output voltage range of 0-5V only
-10U Analog output voltage range of 0-10V only
-5B Analog output voltage range of ±5V only
-10B Analog output voltage range of ±10V only
Call DIO lines can be configured with pull down resistors
USA Office

Address: 1480 Gulf Road, Suite 837,
PO Box 1364
Point Roberts, WA 98281

Western Canada - Vancouver BC

Tel:1.800.663.6001 or 1.604.925.6150
Address: 2454 Haywood Ave
West Vancouver, BC V7V 1Y1

Eastern Canada - Markham, Ontario

Tel:1.800.465.0164 or 1.905.513.7027