USB-202
User's Guide
Document Revision 3
November 2014
© Copyright 2014
Analog and Digital I/O
HM USB-202.docx
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Table of Contents
Preface
About this User's Guide ....................................................................................................................... 5
What you will learn from this user's guide ......................................................................................................... 5
Conventions in this user's guide ......................................................................................................................... 5
Where to find more information ......................................................................................................................... 5
Chapter 1
Introducing the USB-202 ...................................................................................................................... 6
Functional block diagram ................................................................................................................................... 6
Chapter 2
Installing the USB-202 .......................................................................................................................... 7
Unpacking........................................................................................................................................................... 7
Installing the software ........................................................................................................................................ 7
Installing the hardware ....................................................................................................................................... 7
Calibrating the hardware..................................................................................................................................... 7
Factory calibration ............................................................................................................................................................ 7
Field calibration ................................................................................................................................................................ 7
Chapter 3
Functional Details ................................................................................................................................. 8
Analog input acquisition modes ......................................................................................................................... 8
Software paced mode ........................................................................................................................................................ 8
Hardware paced mode....................................................................................................................................................... 8
External components .......................................................................................................................................... 8
Screw terminals................................................................................................................................................................. 9
USB connector .................................................................................................................................................................. 9
LED indicators .................................................................................................................................................................. 9
Signal connections ............................................................................................................................................ 10
Analog input ....................................................................................................................................................................10
External clock I/O ............................................................................................................................................................10
Analog output ..................................................................................................................................................................10
Digital I/O ........................................................................................................................................................................10
Trigger input ....................................................................................................................................................................11
Counter input ...................................................................................................................................................................11
Voltage output .................................................................................................................................................................11
Ground ................................................................................................................................................................ .............11
Mechanical drawings ................................................................................................................................ ........ 12
Chapter 4
Specifications ...................................................................................................................................... 14
Analog input ..................................................................................................................................................... 14
Accuracy ........................................................................................................................................................... 14
Analog input DC voltage measurement accuracy ............................................................................................................14
Noise performance ...........................................................................................................................................................15
Analog input calibration ................................................................................................................................... 15
Analog output ................................................................................................................................................... 15
Digital input/output........................................................................................................................................... 16
External digital trigger ...................................................................................................................................... 16
External pacer input/output............................................................................................................................... 17
Counter ............................................................................................................................................................. 18
Memory ............................................................................................................................................................ 18
Power ................................................................................................................................................................ 18
3
USB-202 User's Guide
USB specifications ........................................................................................................................................... 19
Environmental .................................................................................................................................................. 19
Mechanical ....................................................................................................................................................... 19
Screw terminal connector ................................................................................................................................. 19
Declaration of Conformity .................................................................................................................. 20
4
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Measurement Computing USB-202 data acquisition device and lists device
specifications.
Conventions in this user's guide
For more information
Text presented in a box signifies additional information related to the subject matter.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
bold text Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
Preface
Where to find more information
Additional information about USB-202 hardware is available on our website at www.mccdaq.com. You can
also contact Measurement Computing Corporation with specific questions.
Knowledgebase: kb.mccdaq.com
Tech support form: www.mccdaq.com/support/support_form.aspx
Email: techsupport@mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support
For international customers, contact your local distributor. Refer to the International Distributors section on our
website at www.mccdaq.com/International.
5
Chapter 1
Introducing the USB-202
The USB-202 is a USB 2.0 full-speed device that provides the following features:
Eight single-ended 12-bit analog inputs
100 kS/s max sample rate
Two 12-bit analog outputs
Eight individually configurable digital I/O channels
32-bit counter input
Digital trigger input
External pacer clock input
Internal/external pacer clock output
User voltage output
Two screw terminal banks for field wiring connections
The USB-201 is powered by the +5 V USB supply from your computer; no external power is required. A USB
cable is shipped with the device.
Functional block diagram
Device functions are illustrated in the block diagram shown here.
Figure 1. USB-202 functional block diagram
6
Chapter 2
Installing the USB-202
Unpacking
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the device from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored static charge.
Contact us immediately if any components are missing or damaged.
Installing the software
Refer to the MCC DAQ Quick Start for instructions on installing the software on the MCC DAQ CD. Refer to
the device product page on the Measurement Computing website for information about the included and
optional software supported by the USB-202.
Install the software before you install your device
The driver needed to run the USB-202 is installed with the software. Therefore, you need to install the software
package you plan to use before you install the hardware.
Installing the hardware
Connect the USB cable to an available USB port on the computer or to an external USB hub connected to the
computer. Connect the other end of the cable to the USB connector on the device. No external power is
required.
When connected for the first time, a Found New Hardware dialog opens when the operating system detects the
device. When the dialog closes, the installation is complete. The device Status LED turns on after the device is
successfully installed.
If the Status LED turns off
If communication is lost between the device and the computer, the Status LED turns off. To restore
communication, disconnect the USB cable from the computer and then reconnect it. This should restore
communication, and the Status LED should turn on.
Calibrating the hardware
Factory calibration
The Measurement Computing Manufacturing Test department performs the initial factory calibration. Return
the device to Measurement Computing Corporation when calibration is required. The recommended calibration
interval is one year.
Field calibration
Field calibration is not supported.
7
# channels
scanned
Scan rate
(kS/s)
1
100 2 50 3 33.33 4 25 5 20 6 16.67
7
14.29
8
12.50
1
Screw terminal pins 1 to 16
4
Activity LED
2
Screw terminal pins 17 to 32
5
USB connector
3
Status LED
Chapter 3
Functional Details
Analog input acquisition modes
The USB-202 can acquire analog input data in two different modes – software paced and hardware paced.
Software paced mode
You can acquire one analog sample at a time in software paced mode. You initiate the A/D conversion with a
software command. The analog value is converted to digital and returned to the computer. You can repeat this
procedure until you have the total number of samples that you want.
The maximum throughput sample rate in software paced mode is system-dependent.
Hardware paced mode
You can acquire data from up to eight channels in hardware paced mode. The analog data is continuously
acquired and converted to digital values until you stop the scan. Data is transferred in blocks of 32 samples from
the device to the memory buffer on your computer.
The maximum continuous scan rate is an aggregate rate. The total acquisition rate for all channels cannot
exceed 100 kS/s. The following table lists the scan rate when scanning from one to eight channels.
Maximum continuous scan rate
You can start a hardware paced continuous scan with either a software command or with an external hardware
trigger event.
External components
The external components on the USB-202 are shown in Figure 2.
Figure 2. USB-202 external components
8
USB-202 User's Guide Functional Details
Screw terminals
The screw terminals provide the following connections:
Eight single-ended analog inputs (CH0 to CH7)
Two analog outputs (AOUT0 and AOUT1)
Eight digital I/O (DI00 to DI07)
External pacer clock input (AICKI)
External pacer clock output (AICKO)
Digital trigger input (TRIG)
Counter input (CTR)
User voltage output (+VO)
Analog ground reference (AGND) and digital ground reference (GND)
Figure 3. USB-202 pinout
USB connector
The USB connector provides +5 V power and communication. No external power supply is required.
LED indicators
The device has two LED indicators – Status and Activity.
The Status LED turns on when the device is detected and installed on the computer.
The Activity LED blinks when data is transferred, and is off otherwise.
Refer to Figure 2 on page 8 for the location of these LEDs.
9
USB-202 User's Guide Functional Details
Signal connections
Analog input
You can connect up to 8 single-ended inputs to screw terminals CH0 to CH7. The input voltage range is ±10 V.
Single-ended mode requires two wires; connect one wire to the signal you want to measure (CHx), and connect
a second wire to the analog ground reference (AGND).
External clock I/O
The USB-202 provides one external clock input (AICKI) and one clock output (AICKO) for the analog input
pacer. Connect the external clock signal to AICKI.
When using an external clock, AICKO outputs the pulse generated from AICKI.
When using the internal clock, AICKO outputs the ADC scan clock.
Analog output
The USB-202 has two 12-bit analog outputs (AOUT0 and AOUT1). Both outputs can be updated simultaneously
at a rate of 125 S/s per channel. One output can be updated at a rate of 250 S/s. The output range is fixed at 0 V
to 5 V. The outputs default to 0 V when the host computer is shut down or suspended, or when a reset command
is issued to the device.
Digital I/O
You can connect up to eight digital I/O lines to DIO0 through DIO7. The digital I/O terminals can detect the
state of any TTL-level input. Refer to the schematic shown in Figure 4.
Figure 4. Schematic showing switch detection by digital channel DIO0
If you set the switch to the +5 V input, DIO0 reads TRUE (1). If you move the switch to GND, DIO0 reads
FALSE (0).
Pull-up/down jumper W4
The digital port has 47 kΩ resistors that you can configure as pull-up or pull-down with internal jumper W4 (see
Figure 2 on page 8 for the location of this jumper).
Unconnected inputs are pulled low by default to 0 V through 47 kΩ resistors. The pull-up/pull-down voltage is
common to all 47 kΩ resistors.
You must remove the cover from the device in order to access the jumper. To remove the cover, unscrew the
four screws on the device bottom.
Caution! The discharge of static electricity can damage some electronic components. Before removing the
device from its housing, either ground yourself using a wrist strap or touch the computer chassis or
other grounded object to eliminate any stored static charge.
10
USB-202 User's Guide Functional Details
Figure 5 shows the location of jumper W4 in relation to the USB connector.
Figure 5. Jumper W4 location
Jumper W4 is configured by default for pull-down; see Figure 6.
Figure 6. Jumper W4 pull-up/down configuration
To pull the digital inputs high (+5V), configure the jumper for pull-up.
Proper LED alignment
When placing the circuit board within the housing, align the board LEDs with the top of the housing before
attaching the housing bottom.
Trigger input
The TRIG terminal is an external digital trigger input. The trigger mode is software-selectable for edge- or
level-sensitive.
Counter input
The CTR terminal is a 32-bit event counter that can accept frequency inputs up to 1 MHz. The internal counter
increments when the TTL levels transition from low to high.
Voltage output
The user voltage output (+VO) terminal can output up to 100 mA maximum at approximately +5V. You can use
this terminal to supply power to external devices or circuitry.
Caution! The +VO terminal is an output. Do not connect to an external power supply or you may damage
the device and possibly the computer.
Ground
The analog ground (AGND) terminals provide a common ground for all analog channels. The digital ground
(GND) terminals provide a common ground for the digital, counter, pacer I/O, and power terminal.
For more information about signal connections
For more information about analog and digital signal connections, refer to the Guide to DAQ Signal
Connections at www.mccdaq.com/pdfs/DAQ-Signal-Connections.pdf.
11
USB-202 User's Guide Functional Details
Mechanical drawings
Figure 7. Circuit board (top) and housing dimensions
12
USB-202 User's Guide Functional Details
Figure 8. Housing bottom dimensions
13
Parameter
Condition
Specification
A/D converter type
Successive approximation
ADC resolution
12 bits
Number of channels
8 single-ended
Input voltage range
±10 V
Absolute maximum input
voltage
CHx relative to AGND
±25 V max (power on)
±25 V max (power off)
Input impedance
1 MΩ (power on)
1 MΩ (power off)
Input bias current
10 V input
–12 µA
0 V input
2 µA
–10 V input
12 µA
Input bandwidth
Small signal (–3 dB)
150 kHz
Maximum working voltage
Input range relative to AGND
±10.1 V max
Crosstalk
Adjacent channels, DC to
10 kHz
–75 dB
Input coupling
DC
Sampling rate
Internal pacer
0.016 S/s to 100 kS/s, software-selectable
External pacer
100 kS/s max
Sample clock source
Internal A/D clock
Pacer input terminal AICKI
Channel queue
Up to eight unique, ascending channels
Throughput
Software paced
33S to 4,000 S/s typ, system dependent
Hardware paced
100 kS/s max, system dependent
Warm-up time
15 minutes min
Range
Gain error
(% of reading)
Offset error
(mV)
Absolute accuracy
at Full Scale
(mV)
Gain temperature
coefficient
(% reading/°C)
Offset
temperature
coefficient
(mV/°C)
±10V
0.098
11
20.8
0.016
0.87
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. General analog input specifications
Chapter 4
Accuracy
Analog input DC voltage measurement accuracy
Table 2. DC Accuracy components and specifications; All values are (±)
14
USB-202 User's Guide Specifications
Range
Counts
LSBrms
±10 V
5
0.76
Parameter
Specification
Recommended warm-up time
15 minutes min
Calibration method
Factory
Calibration interval
1 year
Parameter
Condition
Specification
Resolution
12 bits, 1 in 4,096
Output range
0 V to 5.0 V
Number of channels
2
Throughput (Note 1)
Software paced
250 S/s single channel typ, PC dependent
Power on and reset voltage
Initializes to 000h code
0 V, ±10 mV
Output drive
Each D/A OUT
5 mA, sourcing
Slew rate
0.8 V/ µs typ
Range
Accuracy (LSB)
0 V to 5.0 V
5.0 typ, 45.0 max
Range
% of FSR
Gain Error at FS (mV)
Offset (mV)
(Note 2)
Accuracy at FS (mV)
0 V to 5.0 V
0.08 typ, 0.72 max
4.0 typ, 36.0 max
1.0 typ, 9.0 max
5.0 typ, 45.0 max
Noise performance
For the peak to peak noise distribution test, the input channel is connected to AGND at the input terminal block,
and 12,000 samples are acquired at the maximum throughput.
Table 3. Noise performance specifications
Analog input calibration
Table 4. Analog input calibration specifications
Analog output
Table 5. Analog output specifications
Note 1: Maximum throughput when scanning is machine dependent.
Table 6. Analog output accuracy, all values are (±); accuracy tested at no load
Table 7. Analog output accuracy components, all values are (±)
Note 2: Zero-scale offsets may result in a fixed zero-scale error producing a "dead-band” digital input code
region. In this case, changes in digital input code at values less than 0x040 may not produce a
corresponding change in the output voltage. The offset error is tested and specified at code 0x040.
15
USB-202 User's Guide Specifications
Parameter
Specification
Digital type
TTL
Number of I/O
8
Configuration
Each bit may be configured as input (power on default) or output
Pull-up configuration
The port has 47 kΩ resistors that may be configured as pull-up or pull-down with an
internal jumper. The factory configuration is pull-down.
Digital I/O transfer rate
(system-paced)
33 to 4000 port reads/writes per second typ, system dependent
Input low voltage threshold
0.8 V max
Input high voltage threshold
2.0 V min
Input voltage limits
5.5 V absolute max
–0.5 V absolute min
0 V recommended min
Output high voltage
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
Output low voltage
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
Output current
±24 mA max
Parameter
Specification
Trigger source
TRIG input
Trigger mode
Software configurable for edge or level sensitive, rising or falling edge, high or low
level. Power on default is edge sensitive, rising edge.
Trigger latency
1 µs + 1 pacer clock cycle max
Trigger pulse width
125 ns min
Input type
Schmitt trigger, 47 kΩ pull-down to ground
Schmitt trigger hysteresis
1.01 V typ
0.6 V min
1.5 V max
Input high voltage threshold
2.43 V typ
1.9 V min
3.1 V max
Input low voltage threshold
1.42 V typ
1.0 V min
2.0 V max
Input voltage limits
5.5 V absolute max
–0.5 V absolute min
0 V recommended min
Digital input/output
Table 8. Digital input specifications
External digital trigger
Table 6. External digital trigger specifications
16
USB-202 User's Guide Specifications
Parameter
Specification
Terminal names
AICKI, AICKO
Terminal types
AICKI: Input, active on rising edge
AICKO: Output, power on default is 0 V, active on rising edge
Terminal descriptions
AICKI: Receives pacer clock from external source
AICKO: Outputs internal pacer clock
Input clock rate
100 kHz max
Clock pulse width
AICKI: 400 ns min
AICKO: 400 ns min
Input type
Schmitt trigger, 47 kΩ pull-down to ground
Schmitt trigger hysteresis
1.01 V typ
0.6 V min
1.5 V max
Input high voltage
2.43 V typ
1.9 V min
3.1 V max
Input low voltage
1.42 V typ
1.0 V min
2.0 V max
Input voltage limits
5.5V absolute max
-0.5V absolute min
0V recommended min
Output high voltage
4.4 V min (IOH = –50 µA)
3.80 V min (IOH = –8 mA)
Output low voltage
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 8 mA)
Output current
±8 mA max
External pacer input/output
Table 7. External pacer I/O specifications
17
USB-202 User's Guide Specifications
Parameter
Specification
Pin name
CTR
Number of channels
1 channel
Resolution
32-bit
Counter type
Event counter
Input type
Schmitt trigger, 47 kΩ pull-down to ground
Counter read/write rates
(software paced)
33 to 4,000 reads/writes per second typ, system dependent
Schmitt trigger hysteresis
1.01 V typ
0.6 V min
1.5 V max
Input high voltage threshold
2.43 V typ
1.9 V min
3.1 V max
Input low voltage threshold
1.42 V typ
1.0 V min
2.0 V max
Input voltage limits
5.5 V absolute max
–0.5 V absolute min
0 V recommended min
Input frequency
1 MHz max
High pulse width
25 ns min
Low pulse width
25 ns min
Parameter
Specification
Data FIFO
12 K (12,288) analog input samples
Non-volatile memory
2 KB (768 B calibration storage, 256 B UL user data, 1 KB DAQFlex user data)
Parameter
Condition
Specification
Supply current
Typical (Note 3)
150 mA
Maximum (including user voltage, DIO
and AICKO loading)
500 mA
User voltage output terminal
(+VO)
4.25 V min, 5.25 V max
User voltage output current
100 mA max
Counter
Table 8. CTR specifications
Memory
Table 9. Memory specifications
Power
Table 10. Power specifications
Note 3: This is the total quiescent current requirement for the device which includes up to 10 mA for the Status
LED. This value does not include any potential loading of the digital I/O bits, AICKO, or user voltage.
18
USB-202 User's Guide Specifications
Parameter
Specification
USB device type
USB 2.0 (full-speed)
Device compatibility
USB 1.1, USB 2.0
USB cable type
A-B cable, UL type AWM 2725 or equivalent. (minimum 24 AWG VBUS/GND,
minimum 28 AWG D+/D–)
USB cable length
3 m (9.84 ft) max
Parameter
Specification
Operating temperature range
0 °C to 55 °C max
Storage temperature range
–40 °C to 85 °C max
Humidity
0% to 90% non-condensing max
Parameter
Specification
Dimensions (L × W × H)
117.86 × 82.80 × 28.96 mm (4.64 × 3.26 × 1.14 in.) max
Parameter
Specification
Connector type
Screw terminal
Wire gauge range
16 AWG to 30 AWG
Pin
Signal name
Pin description
Pin
Signal name
Pin description
1
GND
Digital ground
17
AGND
Analog ground
2
TRIG
Digital trigger input
18
AOUT1
Analog output 1
3
CTR
Counter input
19
AGND
Analog ground
4
AICKI
External clock pacer input
20
AOUT0
Analog output 0
5
AICKO
External clock pacer output
21
AGND
Analog ground
6
GND
Digital ground
22
CH7
Channel 7
7
+VO
User voltage output
23
CH6
Channel 6
8
GND
Digital ground
24
AGND
Analog ground
9
DIO7
DIO bit 7
25
CH5
Channel 5
10
DIO6
DIO bit 6
26
CH4
Channel 4
11
DIO5
DIO bit 5
27
AGND
Analog ground
12
DIO4
DIO bit 4
28
CH3
Channel 3
13
DIO3
DIO bit 3
29
CH2
Channel 2
14
DIO2
DIO bit 2
30
AGND
Analog ground
15
DIO1
DIO bit 1
31
CH1
Channel 1
16
DIO0
DIO bit 0
32
CH0
Channel 0
USB specifications
Table 11. USB specifications
Environmental
Table 12. Environmental specifications
Mechanical
Table 13. Mechanical specifications
Screw terminal connector
Table 14. Screw terminal connector specifications
Table 15. Screw terminal pinout
19
Declaration of Conformity
Manufacturer: Measurement Computing Corporation
Address: 10 Commerce Way
Suite 1008
Norton, MA 02766
USA
Category: Electrical equipment for measurement, control and laboratory use.
Date of Issue: October 11, 2012
Measurement Computing Corporation declares under sole responsibility that the product
USB-202
to which this declaration relates is in conformity with the relevant provisions of the following standards or other
documents:
EC EMC Directive 2004/108/EC: General Requirements, EN 61326-1:2006 (IEC 61326-1:2005).
Emissions:
EN 55011 (2007) / CISPR 11(2003): Radiated emissions: Group 1, Class A
EN 55011 (2007) / CISPR 11(2003): Conducted emissions: Group 1, Class A
Immunity: EN 61326-1:2006, Table 3.
IEC 61000-4-2 (2001): Electrostatic Discharge immunity.
IEC 61000-4-3 (2002): Radiated Electromagnetic Field immunity.
To maintain compliance to the standards of this declaration, the following conditions must be met.
The host computer, peripheral equipment, power sources, and expansion hardware must be CE
compliant.
All I/O cables must be shielded, with the shields connected to ground.
I/O cables must be less than 3 meters (9.75 feet) in length.
The host computer must be properly grounded.
The host computer must be USB 2.0 compliant.
Equipment must be operated in a controlled electromagnetic environment as defined by Standards EN
61326-1:2006, or IEC 61326-1:2005.
Note: Data acquisition equipment may exhibit noise or increased offsets when exposed to high RF fields
(>1V/m) or transients.
Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in
September, 2012. Test records are outlined in Chomerics Test Report #EMI6206.12.
We hereby declare that the equipment specified conforms to the above Directives and Standards.
Carl Haapaoja, Director of Quality Assurance
Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, Massachusetts 02766
(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
www.mccdaq.com
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