USB-201-OEM
Analog and Digital I/O

User's Guide

May 2021. Rev 8© Measurement Computing Corporation

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NoticeMeasurement Computing Corporation does not authorize any Measurement Computing Corporation product for
use in life support systems and/or devices without prior written consent from Measurement Computing
Corporation. Life support devices/systems are devices or systems that, a) are intended for surgical implantation
into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result ininjury. Measurement Computing Corporation products are not designed with the components required, and are
not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis ofpeople.

HM USB-201-OEM.docx

2

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-201-OEM ........................................................................................................... 6
Functional block diagram .............................................................................................................................. 6
Chapter 2

Installing the USB-201-OEM ............................................................................................................... 7
Unpacking ..................................................................................................................................................... 7
Installing the software.................................................................................................................................... 7
Installing the hardware .................................................................................................................................. 7
Installing on a Windows platform .......................................................................................................................................... 7
Installing on an Android platform .......................................................................................................................................... 7

Calibrating the hardware................................................................................................................................ 7
Chapter 3

Functional Details ............................................................................................................................... 8
Analog input acquisition modes ..................................................................................................................... 8
Software paced mode .............................................................................................................................................................. 8
Hardware paced mode ............................................................................................................................................................. 8

Board components ......................................................................................................................................... 9Connector W1.......................................................................................................................................................................... 9Connector W3........................................................................................................................................................................ 10
Screw terminal connectors .................................................................................................................................................... 10
USB connector....................................................................................................................................................................... 10
LED indicators....................................................................................................................................................................... 10

Signal connections ....................................................................................................................................... 10

Analog input .......................................................................................................................................................................... 10
External pacer I/O ................................................................................................................................................................. 10
Digital I/O .............................................................................................................................................................................. 11
Trigger input .......................................................................................................................................................................... 11Counter input ......................................................................................................................................................................... 11
Voltage output ....................................................................................................................................................................... 11
Ground ................................................................................................................................................................................... 11

Mechanical drawing .................................................................................................................................... 12
Chapter 4

Specifications.................................................................................................................................... 13
Analog input ................................................................................................................................................ 13
Accuracy ..................................................................................................................................................... 13

Analog input DC voltage measurement accuracy ................................................................................................................ 13
Noise performance ................................................................................................................................................................ 14

Analog input calibration .............................................................................................................................. 14
Digital input/output ..................................................................................................................................... 14External digital trigger ................................................................................................................................. 15External pacer input/output .......................................................................................................................... 15Counter........................................................................................................................................................ 16
Memory ....................................................................................................................................................... 16
Power .......................................................................................................................................................... 16
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USB-201-OEM User's Guide

USB specifications ...................................................................................................................................... 17
Environmental ............................................................................................................................................. 17
Mechanical .................................................................................................................................................. 17
Header connectors ....................................................................................................................................... 17
Screw terminal connector (not populated) .................................................................................................... 18

4

Preface

About this User's Guide
What you will learn from this user's guideThis user's guide describes the Measurement Computing USB-201-OEM 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.

Where to find more information
Additional information about USB-201-OEM 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Introducing the USB-201-OEM

Chapter 1

The USB-201-OEM 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
Eight individually configurable digital I/O channels
32-bit counter input
Digital trigger input
External pacer clock input
External pacer clock output
User voltage output
Two header connectors for field wiring connections

The USB-201-OEM device is compatible with both USB 1.1 and USB 2.0 ports. The speed of the device may
be limited when using a USB 1.1 port due to the difference in transfer rates on the USB 1.1 versions of the
protocol (low-speed and full-speed).
The USB-201-OEM is powered by the +5 V USB supply from your computer; no external power is required.
Caution! There are no product safety, electromagnetic compatibility (EMC), or CE marking complianceclaims made for the USB-201-OEM. The USB-201-OEM is intended for use as a component of alarger system. MCC can help developers meet their compliance requirements. The end productsupplier, however, is responsible for conforming to any and all compliance requirements.

Functional block diagram
Device functions are illustrated in the block diagram shown here.

Figure 1. USB-201-OEM functional block diagram

6

Installing the USB-201-OEM

Chapter 2

UnpackingAs with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the board 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.

Installing the software
Refer to the USB-201-OEM product page on our website for information about the software supported by theUSB-201-OEM.
Install the software before you install the hardware
The driver needed to run the device is installed when you install the software. Therefore, you need to install thesoftware package you plan to use before you install the hardware.

Installing the hardware
Installing on a Windows platform
Install the software before you install your device
A driver needed to run the USB-201-OEM is installed when you install the software. Therefore, you need to
install the software package you plan to use before you install the hardware.
For operation on a Windows operating system, we recommend that you run Windows Update to update youroperating system with the latest USB drivers.
To connect the USB-201-OEM to your system, turn on your computer and connect the USB cable to anavailable USB port on the computer or to an external USB hub connected to the computer. Connect the otherend of the USB cable to the USB connector on the device. No external power is required.
When you connect the device for the first time to a computer running Windows, a Found New Hardware dialog
opens when the operating system detects the device. The dialog closes after the device is installed.
A green Status LED indicates the device status. When the LED is on, the device is powered and ready for
operation. When the LED is off, the device is not powered or did not initialize. Figure 2 on page 9 shows thelocation of the Status LED.

Installing on an Android platform
Many Android devices include a standard A-type USB port to connect to the USB-201-OEM. If your device
does not have a USB port, you may need a USB OTG cable in order for your Android device to host a USB
device. Refer to your Android device documentation for more information.

Calibrating the hardware
The Measurement Computing Manufacturing Test department performs the initial factory calibration. Returnthe device to Measurement Computing Corporation when calibration is required. The recommended calibrationinterval is one year.
Field calibration is not supported.

7

Chapter 3

Functional Details
Analog input acquisition modes

The USB-201-OEM 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 asoftware command. The analog value is converted to digital and returned to the computer. You can repeat thisprocedure 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 fromthe 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
# channels
scannedScan rate(kS/s)

1
2
3
4
5
6
7
8

100
50
33.33
25
20
16.67
14.29
12.50

You can start a hardware paced continuous scan with either a software command or with an external hardware
trigger event.

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USB-201-OEM User's Guide

Functional Details

Board components
Board components are shown in Figure 2. Note that each screw terminal location is unpopulated.

1
2
3
4

Screw terminal J1
Screw terminal J2
Header connector W1
Screw terminal J3

5
6
7
8

Screw terminal J8
Header connector W3
Screw terminal J7
Screw terminal J6

9
10
11
12

Activity LED
Status LED
USB connector
Pull-up/down jumper

Figure 2. Board components

Connector W1
Header connector W1 provides connections for the DIO, external clock I/O, trigger, counter, power output, anddigital ground reference.
W1 pin descriptions
Pin
1
3
5
7
9
11
13
15

Signal name
DIO0
DIO2
DIO4
DIO6
GND
GND
AICKI
TRIG

Pin description
DIO channel 0
DIO channel 2
DIO channel 4
DIO channel 6
Digital ground
Digital ground
External clock pacer input
Digital trigger input

Pin
2
4
6
8
10
12
14
16

Signal name
DIO1
DIO3
DIO5
DIO7
+VO
AICKO
CTR
GND

Figure 3. Connector W1 pinout

9

Pin description
DIO channel 1
DIO channel 3
DIO channel 5
DIO channel 7
User voltage output
External clock pacer output
Counter input
Digital groundUSB-201-OEM User's Guide

Functional Details

Connector W3
Header connector W3 provides connections for the analog inputs and the analog ground reference.
W3 pin descriptions
Pin
1
3
5
7
9
11
13
15

Signal name
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7

Pin description
Channel 0
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7

Pin
2
4
6
8
10
12
14
16

Signal name
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND

Pin description
Analog ground
Analog ground
Analog ground
Analog ground
Analog ground
Analog ground
Analog ground
Analog groundFigure 4. Connector W3 pinout

Screw terminal connectors
Screw terminals J1 through J8 are unpopulated. When populated the screw terminals provide alternative
connections to the header connectors. Refer to the Specifications chapter for screw terminal pinouts.

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 9 for the location of these LEDs.

Signal connections
Analog input
You can connect 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 connecta second wire to the analog ground reference (AGND).

External pacer I/O
The USB-201-OEM provides one external clock input (AICKI) and one clock output (AICKO) for the analog
input pacer. You can connect an external clock signal to AICKI.
When using the internal clock, AICKO outputs the ADC sample clock.

10USB-201-OEM User's Guide

Functional Details

Digital I/O
You can connect 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 5.

Figure 5. 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).
Internal pull-up/down configuration
The digital port has 47 kΩ resistors that you can configure as pull-up or pull-down with an internal jumper.
Unconnected inputs are pulled low by default to 0 V through 47 kΩ resistors. The pull-up/pull-down voltage iscommon to all 47 kΩ resistors. You can change the configuration with an internal jumper; see Figure 2 on page
9 for the location this jumper.
Caution! The discharge of static electricity can damage some electronic components. Before handling theboard, either ground yourself using a wrist strap or touch the computer chassis or other grounded
object to eliminate any stored static charge.
Figure 6 shows the jumper configured for pull-down.

Figure 6. Pull-down jumper

Configure the jumper for pull-up to pull the digital inputs high (+5V).

Trigger input
The TRIG terminal is an external digital trigger input. The trigger mode is software-selectable for edge- orlevel-sensitive.

Counter input
The CTR terminal is a 32-bit event counter that can accept frequency inputs up to 1 MHz. The internal counterincrements 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.

GroundThe 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.

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USB-201-OEM User's Guide

Functional Details

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.

Mechanical drawing

Figure 7. Circuit board dimensions

12

Chapter 4

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
Parameter

Conditions

Specification

A/D converter type
ADC resolution

Successive approximation
12 bits

Number of channels

8 single-ended

Input voltage range
Absolute maximum input
voltageCHx relative to AGND

Input impedance
Input bias current

Input bandwidth
Maximum working voltage
Crosstalk
Input coupling
Sampling rate

10 V input
0 V input–10 V input
Small signal (–3 dB)
Input range relative to
AGND
Adjacent channels, DC to
10 kHz–75 dBDC
0.016 S/s to 100 kS/s, software-selectable
100 kS/s max
 Internal A/D clock Pacer input terminal AICKI
Up to eight unique, ascending channels
33 to 4000 S/s typ, system dependent
100 kS/s max, system dependent
15 minutes min

Internal pacer
External pacer

Sample clock source
Channel queue
Throughput±10 V
 ±25 V max (power on)
 ±25 V max (power off) 1 MΩ (power on)
 1 MΩ (power off)
–12 µA
2 µA
12 µA
150 kHz±10.1 V max

Software paced
Hardware paced

Warm-up time

Accuracy
Analog input DC voltage measurement accuracy
Table 2. DC Accuracy components and specifications. All values are (±)

Range

Gain error(% of reading)

Offset error(mV)Absolute accuracy
at Full Scale
(mV)

±10V

0.098

11

20.8

13

Gain temperature
coefficient(% reading/°C)

Offsettemperature
coefficient(mV/°C)

0.016

0.87

USB-201-OEM User's Guide

Specifications

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
Range

Counts

LSBrms

±10 V

5

0.76

Analog input calibration
Table 4. Analog input calibration specifications
Parameter

Specification

Recommended warm-up time
Calibration method
Calibration interval

15 minutes min
Factory
1 yearDigital input/output
Table 5. Digital input specifications
Parameter

Specification

Digital type
Number of I/O
Configuration
Pull-up configuration

TTL
8
Each bit may be configured as input (power on default) or output
The port has 47 kΩ resistors that may be configured as pull-up or pull-down with aninternal jumper. The factory configuration is pull-down.
33 to 4000 port reads/writes per second typical, system dependent

Digital I/O transfer rate(system-paced)
Input low voltage threshold
Input high voltage threshold
Input voltage limits

Output high voltage
Output low voltage
Output current

0.8 V max
2.0 V min
5.5 V absolute max–0.5 V absolute min
0 V recommended min
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)±24 mA max

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USB-201-OEM User's Guide

Specifications

External digital trigger
Table 6. External digital trigger specifications
Parameter

Specification

Trigger source
Trigger mode

TRIG input
Software configurable for edge or level sensitive, rising or falling edge, high or low
level. Power on default is edge sensitive, rising edge.
1 µs + 1 pacer clock cycle max
125 ns min
Schmitt trigger, 47 kΩ pull-down to ground1.01 V typ
0.6 V min
1.5 V max
2.43 V typ
1.9 V min3.1 V max
1.42 V typ
1.0 V min
2.0 V max
5.5 V absolute max–0.5 V absolute min
0 V recommended min

Trigger latency
Trigger pulse width
Input type
Schmitt trigger hysteresis

Input high voltage threshold

Input low voltage threshold

Input voltage limits

External pacer input/output
Table 7. External pacer I/O specifications
Parameter

Specification

Terminal names
Terminal types

AICKI, AICKOAICKI:
Input, active on rising edge
AICKO:
Output, power on default is 0 V, active on rising edge
AICKI:
Receives pacer clock from external source
AICKO:
Outputs internal pacer clock
100 kHz max
AICKI:
400 ns min
AICKO:
400 ns min
Schmitt trigger, 47 kΩ pull-down to ground1.01 V typ
0.6 V min
1.5 V max
2.43 V typ
1.9 V min3.1 V max
1.42 V typ
1.0 V min
2.0 V max
5.5 V absolute max–0.5 V absolute min
0 V recommended min
4.4 V min (IOH = –50 µA)
3.80 V min (IOH = –8 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 8 mA)±8 mA max

Terminal descriptions
Input clock rate
Clock pulse width
Input type
Schmitt trigger hysteresis

Input high voltage threshold

Input low voltage threshold

Input voltage limits

Output high voltage
Output low voltage
Output current

15

USB-201-OEM User's Guide

Specifications

CounterTable 8. CTR specifications
Parameter

Specification

Pin name
Number of channels
Resolution
Counter type
Input typeCounter read/write rates(software paced)CTR
1 channel
32-bitEvent counter
Schmitt trigger, 47 kΩ pull-down to ground
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
2.43 V typ
1.9 V min3.1 V max
1.42 V typ
1.0 V min
2.0 V max
5.5 V absolute max–0.5 V absolute min
0 V recommended min
1 MHz max
25 ns min
25 ns min

Input high voltage threshold

Input low voltage threshold

Input voltage limits

Input frequency
High pulse width
Low pulse width

MemoryTable 9. Memory specifications
Parameter

Specification

Data FIFO
Non-volatile memory

12 K (12,288) analog input samples
2 KB (768 B calibration storage, 256 B UL user data, 1 KB DAQFlex user data)

Power
Table 10. Power specifications
Parameter

Conditions

Specification

Supply current

Typical (Note 1)
Maximum (including user voltage, DIO andAICKO loading)

150 mA
500 mA

User voltage output
terminal (+VO)
User voltage output current

4.25 V min, 5.25 V max
100 mA max

Note 1: This is the total quiescent current requirement for the device which includes up to 10 mA for the Status LED. Thisvalue does not include any potential loading of the digital I/O bits, AICKO, or user voltage.

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USB-201-OEM User's Guide

Specifications

USB specifications
Table 11. USB specifications
Parameter

Specification

USB device type
Device compatibility
USB cable type

USB 2.0 (full-speed)
USB 1.1, USB 2.0
A-B cable, UL type AWM 2725 or equivalent. (minimum 24 AWG VBUS/GND,
minimum 28 AWG D+/D–)
3 m (9.84 ft) max

USB cable length

Environmental
Table 12. Environmental specifications
Parameter

Specification

Operating temperature range
Storage temperature range
Humidity–40 °C to 85 °C max–40 °C to 85 °C max
0% to 90% non-condensing max

Mechanical
Table 13. Mechanical specifications
Parameter

Specification

Dimensions (L × W × H)

98.30 × 76.71 × 14.61 mm (3.87 × 3.02 × 0.575 in.) max

Header connectors
Table 14. Header connector specifications
Parameter

Specification

Connector typeTwo 2 × 8 0.1 in. pitch headers, labeled W1 and W3
Table 15. W1 pinout

Pin
1
3
5
7
9
11
13
15

Signal name
DIO0
DIO2
DIO4
DIO6
GND
GND
AICKI
TRIG

Pin description
DIO channel 0
DIO channel 2
DIO channel 4
DIO channel 6
Digital ground
Digital ground
External clock pacer input
Digital trigger input

Pin
2
4
6
8
10
12
14
16

Signal name
DIO1
DIO3
DIO5
DIO7
+VO
AICKO
CTR
GND

Pin description
DIO channel 1
DIO channel 3
DIO channel 5
DIO channel 7
User voltage output
External clock pacer output
Counter input
Digital ground

Table 16. W3 pinout
Pin
1
3
5
7
9
11
13
15

Signal name
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7

Pin description
Channel 0
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7

Pin
2
4
6
8
10
12
14
16

17

Signal name
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND

Pin description
Analog ground
Analog ground
Analog ground
Analog ground
Analog ground
Analog ground
Analog ground
Analog groundUSB-201-OEM User's Guide

Specifications

Screw terminal connector (not populated)
Table 17. Screw terminal connector specifications
Parameter

Specification

Connector type3.51mm screw terminal footprints (not populated), labeled J1, J2, J3, J6, J7, J8
Table 18. Screw terminal pinout

J1
Pin
5
4
3
2
1
J2
Pin
5
4
3
2
1
J3
Pin
6
5
4
3
2
1

Signal name
DIO0
DIO1
DIO2
DIO3
DIO4

Pin description
DIO channel 0
DIO channel 1
DIO channel 2
DIO channel 3
DIO channel 4

Signal name
DIO5
DIO6
DIO7
GND
+VO

Pin description
DIO channel 5
DIO channel 6
DIO channel 7
Digital ground
User voltage output

Signal name
GND
AICKO
AICKI
CTR
TRIG
GND

Pin description
Digital ground
External clock pacer output
External clock pacer input
Counter input
Digital trigger input
Digital ground

J6
Pin
1
2
3
4
5
6
J7
Pin
1
2
3
4
5
J8
Pin
1
2
3
4
5

18

Signal name
CH0
AGND
CH1
AGND
CH2
AGND

Pin description
Channel 0
Analog ground
Channel 1
Analog ground
Channel 2
Analog ground

Signal name
CH3
AGND
CH4
AGND
CH5

Pin description
Channel 3
Analog ground
Channel 4
Analog ground
Channel 5

Signal name
AGND
CH6
AGND
CH7
AGND

Pin description
Analog ground
Channel 6
Analog ground
Channel 7
Analog groundMeasurement Computing Corporation
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Fax: (508) 946-9500
E-mail: info@mccdaq.com
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