MEASUREMENT COMPUTING USB-2020 Ultra High-Speed Simultaneous USB Device User Guide

: June 5, 2024
: MEASUREMENT COMPUTING

**MEASUREMENT COMPUTING USB-2020 Ultra High-Speed Simultaneous USB Device User Guide

**

What you will learn from this user’s guide

This user’s guide describes the Measurement Computing USB-2020 data acquisition device and lists device specifications.

Conventions in this user’s guide

For more information

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Caution! Shaded caution statements present information to help you avoid injuring yourself and others, damaging your hardware, or losing your data.
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Where to find more information

Additional information about USB-2020 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 web site at www.mccdaq.com/International.

Introducing the USB-2020

The USB-2020 is a high-speed data acquisition USB board supported under the Windows® operating system.

The USB-2020 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 (lowspeed and full- speed).

The USB-2020 device provides the following features:

two 20 MS/s analog inputs
- simultaneous sampling
- 1 A/D per channel
- 12-bit resolution
- ±10 V, ±5 V, ±2 V, ±1 V voltage ranges (software-selectable)
- 17 MHz input bandwidth
64 megasample onboard memory
- 40 MS/s overall rate to onboard memory when acquiring from both channels (20 MS/s per channel)
- 8 MS/s throughput to host computer
Analog and digital triggering (level and edge)
Analog and digital gating
Eight digital I/O lines
Internal or external pacing of analog scans
Eight digital I/O lines
BNC connectors and 40-pin auxiliary connector for signal connections

Functional block diagram

USB-2020 functions are illustrated in the block diagram shown here.
Functional block diagram

Installing the USB-2020

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 and the USB-2020 product page on our website for information about the software that supports the device.

Install the software before you install your device

The driver needed to run the USB-2020 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

Before you connect the USB-2020 to your computer, connect the external power supply that was shipped with the device.

Disconnect USB, then power supply

When disconnecting the USB-2020, disconnect the USB cable first, and then disconnect the power supply.

Connecting the external power supply

Refer to Figure 4 on page 12 for the location of the connectors and LEDs mentioned in the following procedure.

Power to the USB-2020 is provided with the 9 VDC external power supply (CB- PWR-9).

Connect the external power supply before connecting the USB cable to the USB-2020 and your computer.

Complete the following steps to connect the power supply to the USB-2020:

Connect the external power cord to the USB-2020-power connector.
Plug the power supply into a power outlet.

The top (Device Ready) LED is on (blue) when 9 VDC power is supplied the USB-2020 and a USB connection is established. If the voltage supply is less than 7.3 V and/or a USB connection is not established, the Device Ready LED is off.

Connecting the USB-2020

Complete the following steps to connect the USB-2020 to your system:

Connect the USB cable that was shipped with the device to the USB connector on the USB-2020.
The USB cable supplied with the USB-2020 has a higher gauge wire (24 AWG minimum VBUS/GND, 28 AWG minimum D+/D–) than generic USB cables, and is required for proper enumeration of the USB-2020.
Connect the other end of the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer. The bottom (USB Activity) LED turns on. The USB cable only provides communication to the USB-2020.

If you are running Windows XP and connect the device to a USB 1.1 port, a message displays Your USB device can perform faster if you connect to a USB 2.0 port. You can ignore this message.

The USB-2020 functions properly when connected to a USB 1.1 port, although USB bandwidth is limited.

If the Device Ready LED turns off

If communication is lost between the device and the computer, the Device Ready LED turns off. Disconnect the USB cable from the computer and then reconnect it. This should restore communication, and the Device Ready LED should turn on.

If your system does not detect the USB-2020

If a USB device not recognized message appears when you connect the USB-2020, complete the following steps:

Unplug the USB cable from the USB-2020.
Unplug the external power cord from the power connector.
Plug the external power cord back into the power connector.
Plug the USB cable back into the USB-2020.
Your system should now properly detect the USB-2020 hardware. Contact technical support if your system still does not detect the USB-2020.

Removing USB-2020 boards from Windows XP systems

Device Manager may require up to 30 seconds to detect the removal of a USB-2020 board from a Windows XP system with Service Pack 2 installed. This time increases with each additional connected device. If you remove four devices from your system, the time required for Device Manager to update may be almost two minutes.

If you re-attach the USB-2020 to your system before Device Manager updates, the bottom LED does not turn on. Your system does not detect new hardware until Device Manager first detects that hardware has been removed. InstaCal software is unresponsive during this re-detection time. Wait until Device Manager updates with the new hardware before running InstaCal. The USB-2020 is detected by the system when the top (Device Ready) LED is on.

Calibrating the hardware

The Measurement Computing Manufacturing Test department performs the initial factory calibration. The calibration coefficients are stored in non-volatile RAM.

You can use InstaCal to recalibrate the USB-2020. No external equipment or user adjustments are required. At run time, the calibration factors are loaded into system memory and are automatically retrieved each time a different ADC range is specified. A full calibration typically takes less than two minutes.

Before you calibrate the device, turn your computer on and allow at least 30 minutes for the surrounding temperature to stabilize. For best results, calibrate the device immediately before making critical measurements.

The high-resolution analog components on the board are sensitive to temperature. Pre-measurement calibration insures that your device is operating with optimum calibration values.

Board connections

The table below lists the board connector types, applicable cables, and compatible products for the USB-2020.

Board connectors, cables, accessory equipment

Parameter	Specification
Connector types

Four standard BNC female connectors for analog input, clock I/O, and digital trigger input
40-pin IDC connector

Compatible cable for the BNC connectors| Standard BNC cable
Compatible cables for the 40-pin IDC connector| C40FF-x: 40-conductor ribbon cable, female both ends, x = length in feet.
C40-37F-x: 40-pin IDC to 37-pin female D connector, x = length in feet.
Compatible accessory products using the C40FF-x cable| CIO-MINI40
Compatible accessory products using the C40-37F-x cable| CIO-MINI37 SCB-37

Cabling

You can use the CIO-MINI40 screw terminal board and C40FF-x cable for signal connections and termination.
Cabling

You can use the C40-37F-x or C40F-37M-x cable for connections to 37-pin connectors or boards.
Cabling

Field wiring, signal termination and conditioning

You can use the 40-pin CIO-MINI40 universal screw terminal board to terminate field signals and route them into the USB-2020 using the C40FF-x cable:

You can use the following MCC screw terminal boards to terminate field signals and route them into the USB-2020 using the C40-37F-x cable directly:

CIO-MINI37 – 37-pin universal screw terminal board.
SCB-37 – 37-conductor, shielded signal connection/screw terminal box

Functional Details

Analog input acquisition modes

The USB-2020 can acquire analog input data in three different modes – software paced, continuous scan (hardware paced), and BURSTIO.

Software paced

In software paced mode, you can acquire one analog sample at a time. You initiate the A/D conversion by calling a software command. The analog value is converted to digital and returned to the computer. You repeat this procedure until you have the total number of samples that you want from one channel.

The typical throughput sample rate in software paced mode is 4 kS/s (system- dependent).

Continuous scan (hardware paced)

Continuous scan mode enables data to be directly transferred to the host computer during acquisition. The maximum rate in continuous scan mode is 8 MS/s for all acquired data (one channel or two channels). The maximum rate achieved depends on the host computer.

BURSTIO

When using BURSTIO, the USB-2020 can acquire data at the maximum rate of 20 MS/s per channel to the internal memory buffer (up to 64 megasamples)

The acquired data is read from the FIFO and transferred to a user buffer in the computer. You can initiate a single acquisition sequence of one to two channels with either a software command or an external hardware trigger event.

When BURSTIO is enabled, scans are limited to the depth of the onboard memory, as the data is acquired at a rate faster than it can be transferred to the computer. Time must be allowed between scans for the acquisition and the transfer of the data.

Board components

USB connector
Clock I/O BNC connector (CLK IO)
Analog input channel 0 BNC connector (CH0)
External power connector
External digital trigger input BNC connector (TRIG IN)
USB Activity LED
40-pin IDC auxiliary connector
Analog input channel 1 BNC connector (CH1)
Device Ready LED

BNC connectors

The USB-2020 has four BNC connectors that provide connections for the following signals:

Two single-ended analog inputs
One external digital trigger input
One clock input/output

The external digital trigger input signal is also available on the 40-pin IDC connector.

Status LEDs

The Device Ready LED turns on after the device is enumerated by the system and is associated with a hardware driver.
The USB Activity LED turns on when the USB-2020 is transmitting or receiving data.

USB connector

The USB connector provides power to the USB-2020 and communication with the host computer.

External power connector

The USB-2020 requires external power. Connect the CB-PWR-9 power supply to the external power connector.
This power supply provides 9 VDC, 15 A power, and plugs into a standard 120 VAC outlet.

40-pin IDC auxiliary connector (J9)

The 40-pin auxiliary connector provides the following connections for all I/O signals except for analog input and clock I/O:

Eight digital I/O (DIO0 to DIO7)
Digital trigger input (TRIG IN)
12 ground connections (GND)
Two +5V power outputs (+VO)

The signals that are available on the 40-pin IDC connector are listed below. Connect signals on the 40-pin IDC connector using a C40FF-x cable or C40-37F-x cable.

40-pin IDC connector pinout

Pin Description| Signal Name| Pin| | Pin| Signal Name| Pin Description
---|---|---|---|---|---|---
Ground| GND| 1| •| •| 2| +VO| Power output
Ground| GND| 3| •| •| 4| N/C| Do not connect
Digital I/O bit 7| DIO7| 5| •| •| 6| N/C| Do not connect
Digital I/O bit 6| DIO6| 7| •| •| 8| N/C| Do not connect
Digital I/O bit 5| DIO5| 9| •| •| 10| TRIG IN| External digital trigger input
Digital I/O bit 4| DIO4| 11| •| •| 12| GND| Ground
Digital I/O bit 3| DIO3| 13| •| •| 14| GND| Ground
Digital I/O bit 2| DIO2| 15| •| •| 16| GND| Ground
Digital I/O bit 1| DIO1| 17| •| •| 18| GND| Ground
Digital I/O bit 0| DIO0| 19| •| •| 20| GND| Ground
Ground| GND| 21| •| •| 22| N/C| Do not connect
Do not connect| N/C| 23| •| •| 24| N/C| Do not connect
Ground| GND| 25| •| •| 26| N/C| Do not connect
Do not connect| N/C| 27| •| •| 28| N/C| Do not connect
Ground| GND| 29| •| •| 30| N/C| Do not connect
Do not connect| N/C| 31| •| •| 32| N/C| Do not connect
Ground| GND| 33| •| •| 34| N/C| Do not connect
Power output| +VO| 35| •| •| 36| N/C| Do not connect
Ground| GND| 37| •| •| 38| N/C| Do not connect
Do not connect| N/C| 39| •| •| 40| N/C| Do not connect

40-pin to 37-pin signal mapping

Signal mapping on the C40-37F-x cable is not a one-to-one ratio. The table below lists the signals on the 40-pin end and the associated signals on the 37-pin end.
Signal mapping on the C40-37F-x cable

40-pin cable end	37-pin cable end
Pin	Signal Name
1	GND
2	+VO
3	GND
4	N/C
5	DIO7
6	N/C
7	DIO6
8	N/C
9	DIO5
10	TRIG IN
11	DIO4
12	GND
13	DIO3
14	GND
15	DIO2
16	GND
17	DIO1
18	GND
19	DIO0
20	GND
21	GND
22	N/C
23	N/C
24	N/C
25	GND
26	N/C
27	N/C
28	N/C
29	GND
30	N/C
31	N/C
32	N/C
33	GND
34	N/C
35	+VO
36	N/C
37	GND
38	N/C
39	N/C
40	N/C

Signal connections

Analog input

The USB-2020 has two single-ended simultaneous sampling analog inputs that provide sampling at rates of up to 20 MS/s to internal memory when using BURSTIO and at rates of up to 8 MS/s (system-dependent) to the host computer in continuous scan mode. The input ranges are software-selectable for ±10 V, ±5 V, ±2 V, ±1 V.

When using BURSTIO, the internal memory can store up to 64 mega samples at the maximum rate for transfer to the computer after the acquisition is complete. Data is transferred to the host computer at a maximum rate of 8 MS/s (system- dependent).

Buffer size limitations on Windows systems

When creating very large buffers in Windows, you may receive the message “The requested amount of Windows page-locked memory is not available” when you try to start a scan. This error occurs when there is enough memory to create the buffer, but the memory cannot be locked down. For example, the driver can only lock a maximum buffer size of 67,107,800 bytes (33,553,900 samples) on Windows XP systems. A workaround for this is available when BURSTIO is enabled, allowing you to transfer the entire 64 MS of data from the onboard memory to the Windows buffer. Refer to the USB-2020 topic in the UL Help for more information.

You can pace analog input operations with the internal A/D clock or with an external clock source. When using an external input scan clock, connect the clock source to the CLK IO BNC connector.

For more information about signal connections

For more information about signal connections, refer to the Guide to DAQ Signal Connections (available for download from www.mccdaq.com/support/DAQ- Signal-Connections.aspx.)

External clock I/O

USB-2020 analog input scanning operations can be paced with the internal A/D clock or with an external clock source. The CLK IO connector can be configured through software for input (default) for external pacing, or for output to pace a connected device.

Digital I/O

You can connect eight digital I/O lines to DIO0 through DIO7 on the 40-pin IDC connector. When a bit is configured for input, it can detect the state of any TTL-level input.

Digital input voltage ranges of up to 0 to 15 V are permitted, with thresholds of 0.8 V (low) and 2.0 V (high).

Each DIO channel is an open-drain, which can sink up to 150 mA for direct drive applications when used as an output.

Figure 5 shows an example of a typical digital output connection.
Digital I/O

External pull-up capability

Inputs are pulled high by default to 5 V through 47 kΩ resistors on the circuit board. The pull-up voltage is common to all 47 kΩ resistors.

You can configure the pull-up/pull-down state by changing the placement of the shorting block located at the three-pin header J10. Pull-up is the default factory configuration
Figure 6. Pull-up and pull-down jumper configurations (J10)
Pull-up default configuration (factory default)

Pull-down configuration

An external pull-up resistor can be used to pull the DIO bit up to a voltage that exceeds the internal 5 V pull-up voltage (15 V maximum). Be aware that this would place the 47 k internal pull-up resistor in a parallel resistance configuration that could offset the logic high voltage level.
External pull-up capability

Trigger input

Both the TRIG IN BNC connector and the TRIG IN IDC pin are external digital trigger/gate inputs that you can configure through software.

An analog scan can have a trigger or a gate, but not both. For example, you cannot use an analog trigger and use the TRIG IN BNC connector to gate at the same time.

A trigger or gate can be digital or analog.

Digital triggers can be configured for rising or falling edge, or for high or low level.

USB-2020 User’s Guide Functional Details

Analog triggers can be configured for software-selectable high or low level, or for rising or falling edge with software-selectable hysteresis.
Digital gates can be configured for high or low level.
Analog gates can be configured for software-selectable high or low level, or for in or out of software selectable window.

Each configuration is explained below:

High or low level
Trigger or gate an acquisition when an input signal is higher or lower than the specified voltage.
Rising or falling edge
Trigger an acquisition when input signals cross a specified voltage (rising or falling)
Window
Gate an acquisition when the input signal is within or outside two specified voltages (in/out of window)
Hysteresis
After the input signal has passed through one specified voltage, trigger an acquisition when the input signal passes through a second voltage (positive or negative). For example, once the signal goes below 5 V, a rising edge that crosses 4 V must occur to trigger an acquisition.

Mechanical drawing

Specifications

All specifications are subject to change without notice.
Typical at 25 °C unless otherwise specified Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter	Condition	Specification
A/D converter type		AD9225
Number of channels		2
Resolution		12-bits
Input configuration		Single-ended, individual A/D per channel
Sampling method		Simultaneous
Input ranges		±10 V, ±5 V, ±2 V, ±1 V, software-selectable
Connection type		BNC
Input coupling		DC
Absolute maximum input voltage		±15 V max (power on)
Input impedance		1.5 MΩ typ
Input leakage current		2 uA typ, 10 uA max
Input bandwidth (3 dB)	All input ranges	17 MHz typ
Crosstalk	DC to 10 kHz	–90 dB
Trigger source	Digital	TRIG IN (BNC connector and 40-pin connector) See

External trigger for more information
Analog| CH0 or CH1
Sample clock source| Internal| 1 kHz to 20 MHz max
External| CLK IO (BNC connector)

See External clock input/output for more information

Accuracy

Table 2. DC Accuracy components and specifications. All values are (±)

Range| Gain error

(% of reading)

| Offset error (mV)| INL error

(% of range)

| Absolute accuracy at Full Scale (mV)| Gain temperature coefficient

(% reading/°C)

| Offset temperature coefficient (µV/°C)
---|---|---|---|---|---|---
±10 V| 0.11| 5.2| 0.0976| 35.72| 0.0035| 30
±5 V| 0.11| 5.2| 0.0488| 20.46| 0.0035| 110
±2 V| 0.11| 1.1| 0.0244| 8.18| 0.0035| 10
±1 V| 0.11| 1.1| 0.0122| 4.64| 0.0035| 25

Noise performance

For the peak-to-peak noise distribution test, a single-ended input channel is connected to AGND at the input BNC connector and 20,000 data samples are acquired at the maximum rate.

Table 3. Noise performance specifications

Range	Counts	LSBrms
±10 V	5	0.76
±5 V	5	0.76
±2 V	7	1.06
±1 V	7	1.06

Analog input calibration

Table 4. Analog input calibration specifications

Parameter	Specification
Recommended warm-up time	15 minutes min
Calibration method	Self calibration, with calibration factors for each range

stored onboard in non-volatile memory
Calibration interval| 1 year (factory calibration)

Digital input/output

Table 5. Digital I/O specifications

Parameter	Specification
Digital type	CMOS
Number of I/O	8
Configuration	Each bit can be independently configured as input (power on

default) or output Input bits can be read at any time whether the digital output is active or tri-stated.
Input voltage range| 0 V to 15 V
Input characteristics| 47 kΩ pull-up/pull-down resistor, 28 kΩ series resistor
Abs. Maximum input voltage| +20 V max
Pull-up/pull-down configuration| The port has 47 kΩ resistors that can be configured as pull-up or pull-down with an internal jumper. The factory configuration is pull-up (J10 shorting block default position is pins 1 and 2). Pull down capability is available by placing the J10 shorting block across

pins 2 and 3.

Digital I/O transfer rate (software paced)| 33 S/s to 4,000 S/s typ; system- dependent
Input high voltage| 2.0 V min
Input low voltage| 0.8 V max
Output characteristics| 47 kΩ pull-up, open drain (DMOS transistor, source connected to ground)
Output voltage range| 0 V to 5 V (using 47 kΩ internal pull up resistors)

0 V to 15 V max through optional, user-supplied external pull-up resistors (Note 1)

Drain to source breakdown voltage| 42.5 V min (Note 2)
Off state leakage current| 1.0 µA
Sink current capability|

150 mA max (continuous) per output pin
150 mA max (continuous), total for all eight channels

DMOS transistor on- resistance (drain to source)| 4 Ω

Note 1: Adding external pull-up resistors connects the output bit in parallel with the internal 47 kΩ pull-up resistor. The resulting load voltage depends on the value of the external resistor value and the pull-up voltage used. In general, external 10 KΩ pull-up resistors are sufficient for most applications.
Note 2: Does not include the additional leakage current contribution that can occur when using an external pull-up resistor.

External trigger

Table 6. External trigger specifications

Parameter	Condition	Specification
Trigger source	Digital	TRIG IN (BNC connector and 40-pin connector)
Analog	CH0 or CH1
Trigger mode	Digital	Rising or falling edge, high or low level
Analog	Trigger above or below software-selectable level, rising or falling

External clock input/output

Table 7. External clock I/O specifications

Parameter	Specification
Terminal name	CLK IO (BNC connector)
Terminal type	ADC clock input/output, software-selectable for input or output

(default is input)
Terminal description| n When configured for input, receives sampling clock from external source

n When configured for output, outputs the internal sampling clock

Memory

Table 8. Memory specifications

Parameter	Specification
Data FIFO	64 MS using BURSTIO, 4 kS not using BURSTIO
Non-volatile memory	32 KB (30 KB firmware storage, 2 KB calibration/user

data)

Power

Table 9. Power specifications

Parameter	Specification
Supply voltage	9 VDC to 18 VDC; MCC plug-in power supply CB-PWR-9 recommended
Supply current	0.75 A max (Note 3)
Power jack configuration	Two conductor, barrel
Power jack barrel diameter	6.3 mm
Power jack pin diameter	2.0 mm
Power jack polarity	Center positive
+VO voltage range	4.50 V to 5.25 V
+VO current sourcing	10 mA max

Note 3: This is the total quiescent current requirement for the device that includes up to 10 mA for the Status LED. This value does not include potential loading of the DIO bits or the +VO pin.

Environmental

Table 10. Environmental specifications

Parameter	Specification
Operating temperature range	0 °C to 50 °C max
Storage temperature range	–40 °C to 85 °C max
Humidity	0% to 90% non-condensing max

Mechanical

Table 11. Mechanical specifications

Parameter	Specification
Dimensions (L × W × H)	142.24 × 180.34× 38.09 mm (5.6 × 7.1 × 1.5 in.)
Weight	1.5 lb

USB

Table 12. USB specifications

Parameter	Specification
USB device type	USB 2.0 (high-speed)
Device compatibility	USB 2.0
USB cable type	A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG

VBUS/GND, min 28 AWG D+/D–)
USB cable length| 3 m (9.84 ft) max

Signal I/O connectors

Table 13. Connector specifications

Connector	Specification
USB	B type
Auxiliary connector (J9)	40-pin header connector
Compatible cables for the 40-pin auxiliary connector

C40FF-x
C40-37F-x

Compatible accessory products with the C40FF-x cable| CIO-MINI40
Compatible accessory products with the C40-37F-x cable|

CIO-MINI37
SCB-37

BNC connectors

Table 14. BNC connector pinout

BNC signal name	Signal description
CH0	Analog input channel 0
CH1	Analog input channel 1
TRIG IN	BNC connection for external digital trigger (Note 4)
CLK IO	BNC connection for the ADC clock input/output, software-selectable for

input or output (default is input)

Note 4: Also available on auxiliary connector J9.

Auxiliary connector J9

Table 15. 40-pin connector J9 pinout

Pin| Signal name| Pin description| Pin| Signal name| Pin description
---|---|---|---|---|---
1| GND| Ground| 2| +VO| Power output
3| GND| Ground| 4| N/C| Do not connect
5| DIO7| Digital I/O bit 7| 6| N/C| Do not connect
7| DIO6| Digital I/O bit 6| 8| N/C| Do not connect
9| DIO5| Digital I/O bit 5| 10| TRIG IN| External digital trigger input
11| DIO4| Digital I/O bit 4| 12| GND| Ground
13| DIO3| Digital I/O bit 3| 14| GND| Ground
15| DIO2| Digital I/O bit 2| 16| GND| Ground
17| DIO1| Digital I/O bit 1| 18| GND| Ground
19| DIO0| Digital I/O bit 0| 20| GND| Ground
21| GND| Ground| 22| N/C| Do not connect
23| N/C| Do not connect| 24| N/C| Do not connect
25| GND| Ground| 26| N/C| Do not connect
27| N/C| Do not connect| 28| N/C| Do not connect
29| GND| Ground| 30| N/C| Do not connect
31| N/C| Do not connect| 32| N/C| Do not connect
33| GND| Ground| 34| N/C| Do not connect
35| +VO| Power output| 36| N/C| Do not connect
37| GND| Ground| 38| N/C| Do not connect
39| N/C| Do not connect| 40| N/C| Do not connect

Note 5: N/C = no connection, not used

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Documents / Resources

| MEASUREMENT COMPUTING USB-2020 Ultra High-Speed Simultaneous USB Device [pdf] User Guide
USB-2020 Ultra High-Speed Simultaneous USB Device, USB-2020, Ultra High-Speed Simultaneous USB Device
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