Measurement Computing USB-ERB24 User manual

USB-ERB24
USB-based 24-Channel Electromechanical Relay Interface Device
June 2021. Rev 9
© Measurement Computing Corporation.
User's Guide

HM USB-ERB24.docx
Trademark and Copyright Information
Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo are
either trademarks or registered trademarks of Measurement Computing Corporation. Refer to the Copyrights &
Trademarks section on mccdaq.com/legal for more information about Measurement Computing trademarks.
Other product and company names mentioned herein are trademarks or trade names of their respective
companies.
© 2021 Measurement Computing Corporation. All rights reserved. No part of this publication may be
reproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic, mechanical, by
photocopying, recording, or otherwise without the prior written permission of Measurement Computing
Corporation.
Notice
Measurement 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 in
injury. 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 of
people.

3
Table of Contents
Preface
About this User's Guide ..................................................................................................................... 4
What you will learn from this user's guide ..................................................................................................... 4
Conventions in this user's guide..................................................................................................................... 4
Where to find more information..................................................................................................................... 4
Chapter 1
Introducing the USB-ERB24............................................................................................................... 5
USB-ERB24 block diagram........................................................................................................................... 5
Chapter 2
Installing the USB-ERB24................................................................................................................... 6
Unpacking ..................................................................................................................................................... 6
Installing the software.................................................................................................................................... 6
Configuring the hardware switches................................................................................................................ 6
Relay control logic polarity switch (S1).................................................................................................................................6
Connecting the external power supply ........................................................................................................... 7
Installing the hardware .................................................................................................................................. 8
If your system does not detect the USB-ERB24....................................................................................................................8
Chapter 3
Functional Details ............................................................................................................................... 9
Components .................................................................................................................................................. 9
USB in connector ....................................................................................................................................................................9
USB out connector ..................................................................................................................................................................9
POWER IN connector...........................................................................................................................................................10
POWER OUT connector.......................................................................................................................................................10
USB LED...............................................................................................................................................................................10
PWR LED..............................................................................................................................................................................10
Invert/non-invert switch (S1)................................................................................................................................................10
Pull-up/down switch (S2)......................................................................................................................................................11
Screw terminals and relays ...................................................................................................................................................11
Relay configuration ..................................................................................................................................... 12
Relay contact protection circuit for inductive loads ............................................................................................................12
Daisy chaining additional relays to the USB-ERB24.................................................................................... 13
Power limitations using multiple USB-ERB24 devices ................................................................................ 13
Voltage drop ..........................................................................................................................................................................13
Chapter 4
Specifications.................................................................................................................................... 14
Output specifications ................................................................................................................................... 14
Power .......................................................................................................................................................... 14
External power input ................................................................................................................................... 15
External power output.................................................................................................................................. 15
USB specifications ...................................................................................................................................... 15
Relay contact pull-up/down option .............................................................................................................. 15
Mechanical .................................................................................................................................................. 16
Environmental ............................................................................................................................................. 16
Main connector............................................................................................................................................ 16
Screw terminal pinout.................................................................................................................................. 17
Declaration of Conformity................................................................................................................ 19

4
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Measurement Computing USB-ERB24 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-ERB24 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: [email protected]
Phone: [phone] 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-ERB24
The USB-ERB24 is a USB 2.0 full-speed device that provides the following features:
24 single-pole double-throw (SPDT) Form C electromechanical relays directly controlled by digital I/O
lines
Supports configurations as two banks of eight and two banks of four
Onboard switches to configure the logic polarity (active high or low) and power-on state for each relay
group.
Switch settings can be read back with software.
Screw terminals for field wiring connections with three connections to each relay – normally open (NO),
normally closed (NC), and common (C).
USB out and power out connections support powering and controlling multiple MCC USB devices that
support daisy-chaining from one external power source and one USB port in a daisy-chain configuration.1
Rugged enclosure that can mount on a DIN rail or on a bench
The USB-ERB24 is powered by an external 9 V regulated power supply that is shipped with the device.
USB-ERB24 block diagram
USB-ERB24 functions are illustrated in the block diagram shown here.
Figure 1. USB-ERB24 functional block diagram
1Depending on your load requirements, daisy chained devices may require a separate power supply.

6
Chapter 2
Installing the USB-ERB24
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-ERB24 product page on our website for information about the
available software.
Install the software before you install your device
The driver needed to run the USB-ERB24 is installed with the software. Therefore, you need to install the
software package you plan to use before you install the hardware.
Configuring the hardware switches
The USB-ERB24 has banks of onboard switches that configure the relay logic polarity and relay power-up
state. Configure these switches before you connect the external power supply to the USB-ERB24. Factory-
configured default settings are listed in the table below. Refer to Figure 5 on page 9 for the location of each
switch.
Default switch configuration
Board label Description Default setting
INVERT NON-INVERT
S1
Configures the relay control logic parity per relay bank for invert or
non-invert logic.
Non-invert
Pull DOWN PULL UP
S2
Configures the relay power-on state per relay bank for pull-up or
pull-down.
Pull-down
Each DIP switch configures one relay group. The DIP switch labeled Aconfigures relays 1 to 8, the switch
labeled Bconfigures relays 9 to 16, the switch labeled CL configures relays 17 to 20, and the switch labeled CH
configures relays 21 to 24 (refer to Figure 2 below).
Figure 2. Typical board switch
Port A consists of relays 1 through 8, Port B consists of relays 9 through 16, Port CL consists of relays 17
through 20, and Port CH consists of relays 21 through 24.
Remove the device from the enclosure to access the onboard switches
To change the configuration of a switch, you must first remove the USB-ERB24 from the enclosure.

USB-ERB24 User's Guide Installing the USB-ERB24
7
Relay control logic polarity switch (S1)
Configure the Invert/non-invert switch (S1) to set the relay control logic polarity for each relay bank for invert
or non-invert. By default, this switch is shipped with all banks configured for non-inverted logic, as shown in
Figure 3.
Figure 3. Relay logic polarity switch S1
NON-INVERT mode: when "0" is written or read back through the USB bus, the relays are not energized.
INVERT mode: when "0" is written or read back through the USB bus, the relays are energized.
Switch settings for polarity can be read back using software through the USB bus. Switch settings for S1 do not
affect the power-on condition.
Relay power-on state switch (S2)
Configure the Pull-up/pull-down switch (S2) to set the state of each relay bank at power-up. By default, this
product is shipped with the switch for all banks configured for pull-down (relays inactive at power up), as
shown in Figure 4. Switch settings can be read back using software through the USB bus.
Figure 4. Resistor pull-up/down switch S2
PULL-UP: the relays are put into an energized state at power-up, regardless of the state of switch S1
PULL-DOWN: the relays are put into a non-energized state at power-up.
Connecting the external power supply
Power to the USB-ERB24 is provided with the 9 V, 3 A external power supply (CB PWR-9V3A). You must
connect the external power supply before connecting the USB connector to the USB-ERB24.
To connect the power supply to your USB-ERB24, complete the following steps:
1. Connect the external power cord to the power connector labeled POWER IN on the USB-ERB24 enclosure
(PWR IN on the board). Refer to Figure 5 for the location of this connector.
2. Plug the AC adapter into a power outlet.
The PWR LED turns on when 9 V power is supplied to the USB-ERB24. If the voltage supply is less than 6.0 V
or more than 12.5 V, the PWR LED does not turn on.
Do not connect external power to the POWER OUT connector
The power connector labeled POWER OUT on the enclosure (PWR OUT on the board) is used to provide power
to additional MCC USB devices. If you connect the external power supply to the POWER OUT connector, the
USB-ERB24 does not receive power, and the PWR LED does not turn on.

USB-ERB24 User's Guide Installing the USB-ERB24
8
Installing the hardware
To connect the USB-ERB24 to your system, complete the following steps.
1. Turn your computer on.
2. Connect the USB cable to the USB connector labeled USB IN on the USB-ERB24.
3. 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 USB LED turns on. Refer to Figure 5 on page 9 for the location of the USB LED.
Windows finds and installs the device driver automatically, and notifies you that the device is ready to use.
If the USB LED turns off
If communication is lost between the device and the computer, the USB LED turns off. To restore
communication, disconnect the USB cable from the computer and then reconnect it. This should restore
communication, and the USB LED should turn on.
If your system does not detect the USB-ERB24
If a USB device not recognized message displays when you connect the USB-ERB24, complete the following
steps:
1. Unplug the USB cable from the USB-ERB24.
2. Unplug the external power cord from the POWER IN connector on the enclosure.
3. Plug the external power cord back into the POWER IN connector.
4. Plug the USB cable back into the USB-ERB24.
Your system should now properly detect the USB-ERB24.
Contact technical support if your system still does not detect the USB-ERB24.
Caution! Do not disconnect any device from the USB bus while the computer is communicating with the
USB-ERB24, or you may lose data and/or your ability to communicate with the USB-ERB24.

9
Chapter 3
Functional Details
Components
The USB-ERB24 has the following internal components, as shown in Figure 5.
Two (2) USB connectors
Two (2) external power connectors
USB LED
PWR LED
Invert/non-invert switch (S1) — sets the relay control logic polarity
Pull-up/down switch (S2) — sets the relay power-on state
Screw terminals
1
USB output connector (USB OUT)
6
Invert/non-invert switch (S1)
2
USB input connector (USB IN)
7
USB LED
3 Power output connector (
POWER OU
T 8
PWR
LED
4
Power input connector (POWER IN)
9
Pull-up/down switch (S2)
5
Screw terminals
Figure 5. USB-ERB24 components
USB in connector
The USB in connector is labeled USB IN on the board and enclosure. This connector is a USB 2.0 full-speed
input connector that you connect to the USB port on your computer (or USB hub connected to your computer).
This connector supports USB 1.1 and USB 2.0 devices.
Hardware revision G and later are also compatible with USB 3.0 ports. The board revision may be determined
from the part number label on the enclosure that states "193773X-01L," where X is the board revision.
USB out connector
The USB out connector is labeled USB OUT on the board and enclosure. This connector is a downstream hub
output port intended for use with other MCC devices that support daisy chaining. The USB hub is self-powered,
and can provide 100 mA maximum current at 5 V.
For information on daisy chaining to other MCC USB devices, refer to Daisy chaining additional relays to the
USB-ERB24 on page 13.

USB-ERB24 User's Guide Functional Details
10
POWER IN connector
The USB-ERB24 requires between 6.0 V and 12.5 V of external power. An external power connection is
required to activate the relays and to run tests in InstaCal.
To supply external power, connect the POWER IN connector to the supplied +9 V external power supply
(CB PWR-9V3A).
POWER OUT connector
Use the POWER OUT connector to provide power to additional daisy chained MCC USB devices from a single
external power supply. Depending on your load requirements, daisy chained products may require a separate
power supply. Refer to Power limitations using multiple USB-ERB24 devices on page 13 for more information.
A user-supplied custom cable is required to daisy chain multiple devices.
USB LED
The USB LED indicates the communication status of the USB-ERB24. It uses up to 5 mA of current and cannot
be disabled. The table below explains the USB LED function.
USB LED Indications
USB LED Indication
On
The USB-ERB24 is connected to a computer or external USB hub.
Blinking
Initial communication is established between the USB-ERB24 and the computer, or data is being
transferred.
PWR LED
The USB-ERB24 incorporates an onboard voltage supervisory circuit that monitors the external 9 V power. If
the input voltage falls outside of the specified range, the PWR LED shuts off. The table below explains the
function of the PWR LED.
PWR LED Indications
PWR LED Indication
On
External power is supplied to the USB-ERB24.
Off
Power is not supplied by the external supply, or a power fault has occurred. A power fault occurs
when the input power falls outside of the specified voltage range of the external supply
(6.0 V to 12.5 V).
Invert/non-invert switch (S1)
The Invert/non-invert switch (S1) sets the relay control logic per relay bank to either inverted or non-inverted.
By default, switch S1 is configured for non-invert (see Figure 6).
Figure 6. Switch S1 default configuration

USB-ERB24 User's Guide Functional Details
11
The switch labeled Aconfigures relays 1 through 8, the switch labeled Bconfigures relays 9 through 16, the
switch labeled CH configures relays 17 through 20, the switch labeled CL configures relays 21 through 24.
NON-INVERT: When 0is written or read back through the USB bus, the relays are not energized.
INVERT: When 0is written or read back through the USB bus, the relays are energized.
Switch settings do not affect the power-on condition. Use InstaCal to read the current logic setting for each
module group.
Pull-up/down switch (S2)
The pull-up/down switch (S2) sets the power-on state of each relay bank. By default, switch S2 is configured
for pull-down (relays are inactive at power-up – see Figure 7).
Figure 7. Switch S2 default configuration
The switch labeled Aconfigures relays 1 through 8, the switch labeled Bconfigures relays 9 through 16, the
switch labeled CH configures relays 17 through 20, the switch labeled CL configures relays 21 through 24.
PULL UP: The relay energizes at power-up, regardless of the state of switch S1.
PULL DOWN: The relays are not energized at power-up.
Use InstaCal to read the current power-on state setting for each module group.
Screw terminals and relays
Connect external devices to the relay contacts using the USB-ERB24 set of 24 screw terminals. Each relay has a
normally closed (NC), common (C), and normally open (NO) contact. Figure 8 shows the screw terminals on a
typical relay channel.
Figure 8. Typical relay channel
Each screw terminal is identified with a label on the board and on the underside of the enclosure lid.
Caution! Before connecting wires to the screw terminals, turn off the power to the USB-ERB24, and
make sure that the signal wires do not contain live voltages.
Use 12-22 AWG wire for your signal connections. Properly insulate the wires to avoid any
short circuit to the other channels, ground, or other points on the board.
Caution! Keep the length of stripped wire at a minimum to avoid a short to the enclosure. When
connecting your field wiring to the screw terminals, use the strip gage on the terminal strip, or
strip to 5.5 - 7.0 mm (0.215 to 0.275 in.) long.

USB-ERB24 User's Guide Functional Details
12
Relay configuration
You can install a pull-up or pull-down resistor at the NO and NC terminals on each relay. Note that the pull-up
resistors are tied to the 5 V power and should be considered when calculating the power budget. The relay
configuration is shown in Figure 9
Figure 9. Relay configuration
The relay contacts associated that are with each relay location are listed in the table below.
Relay locations and associated contacts
R35, R36, R41, R43, R45, R47, R49, R51, R87, R89, R91, R93, R96,
R98, R100, R102, R103, R105, R107, R109, R112, R114, R116, R118
Relays NO contact pull-up (to USB +5 V) /
pull-down, user installed.
R37, R40, R42,R44, R46, R48, R50, R52, R88, R90, R92, R94, R95,
R97, R99, R101, R104, R106, R108, R110, R111, R113, R115, R117
Relays NC contact pull-up (to USB +5 V) /
pull-down, user installed
Relay contact protection circuit for inductive loads
When you connect an inductive load to a relay, energy stored in the inductive load can induce a large voltage
surge when you switch the relay. This voltage can severely damage the relay contacts. To limit the voltage
surge across the inductive load in a DC circuit, install a kickback diode across the inductive load. Refer to the
contact protection circuit in Figure 10. For AC loads, install a metal oxide varistor (MOV).
Figure 10. Relay contact protection circuit

USB-ERB24 User's Guide Functional Details
13
Daisy chaining additional relays to the USB-ERB24
Daisy-chained USB-ERB24 devices connect to the USB bus through the high-speed hub on the USB-ERB24.
You can daisy chain up to four MCC USB devices that support daisy-chain configurations to a single USB 2.0
port or USB 1.1 port on your computer.
A user-supplied custom cable is required to daisy chain multiple devices.
Perform the following procedure to daisy chain multiple devices together.
The device connected to the computer is referred to as the host device.
Each additional device that you want to daisy chain to the host USB-ERB24 is referred to as a slave device.
This procedure assumes you already have a host device connected to a computer and to an external power
source.
1. Connect the POWER OUT connector on the host device to the POWER IN connector on the slave device.
This step is required only if you plan to daisy chain power to another device.
1. Connect the USB OUT connector on the host device to the USB IN connector on the slave device.
2. To add another device, repeat steps 1-2 by connecting the slave device to another slave device.
Note that the last device in the chain is supplied with external power.
Power limitations using multiple USB-ERB24 devices
When daisy chaining the USB-ERB24 to other MCC USB devices, make sure that you provide adequate power
to each device that you connect. The USB-ERB24 is powered with a 9 VDC nominal, 3.0 A external power
supply.
Voltage drop
A drop in voltage occurs with each board connected in a daisy chain system. The voltage drop between the
power supply input and the daisy chain output is 0.5 V maximum. Factor in this voltage drop when you
configure a daisy chain system to ensure that at least 6.0 VDC is provided to the last board in the chain.

14
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.
Output specifications
Table 1. Output specifications
Number of relays
24
Relay configuration
2 banks of 8 and 2 banks of 4
Contact configuration
24 Form C (SPDT) Normally Open, Normally Closed and Common available at
screw terminals
Contact rating
5 A @ 240 VAC or 28 VDC resistive
Contact resistance
100 mΩ max (initial value)
Operate time
10 ms max
Release time
5 ms max
Vibration
10 Hz to 55 Hz (amplitude 1.5 mm)
Shock
10 G (11 ms)
Dielectric isolation (between
relay open contact)
300 VAC, 50/60 Hz (1 minute)
Dielectric isolation (between
PCB output lines)
500 VAC, 50/60 Hz (1 minute)
Life expectancy
10 million mechanical operations min
Power on state
S2 = pull-up
Energized. NO in contact with Common
S2 = pull-down
Not energized. NC in contact to Common
Relay control logic polarity
User-configurable per bank via switch S1 for invert or non-invert (default). Switch
settings for polarity can be read back via software through the USB bus. Switch
settings do not affect the power on condition.
Non-invert mode: When 0 is written or read back via the USB bus, relays are not
energized.

Invert mode: When 0 is written or read back via the USB bus, relays are energized.
Pull-up / pull-down
User-configurable per bank via switch S2 for pull-down (default) or pull-up.
Switch settings can be read back via software.
Pull-down will put the relays in non-energized mode on power up.

Pull-up will put the relays in energized mode on power up.
Power
Table 2. Power specifications
Parameter Conditions Specification
USB +5 V input voltage range
4.75 V min. to 5.25 V max.
USB +5 V supply current
All modes of operation
10 mA max
External power supply (required)
CB PWR-9V3A
9 V ±10% @ 3 A
Voltage supervisor limits - PWR
LED
V
ext
< 6.0 V
,
V
ext
> 12.5 V
PWR LED = Off (power fault)
6.0 V < Vext < 12.5 V
PWR LED = On
External power consumption
All relays on, 100 mA downstream hub power
1.5 A typ, 1.8 A max
All relays off, 100 mA downstream hub power
230 mA typ, 270 mA max

USB-ERB24 User's Guide Specifications
15
External power input
Table 3. External power input specifications
Parameter Conditions Specification
External power input
+6.0 VDC to 12.5 VDC (9 VDC power
supply included).
Voltage supervisor limits - PWR LED
(Note 1)
6.0 V > V
ext
or V
ext
> 12.5 V
PWR LED = Off (power fault)
6.0 V < V
ext
< 12.5 V
PWR LED = On
External power supply (included)
CB PWR-9V3A
+9 V ±10%, @ 3 A
Note 1: The USB-ERB24 monitors the external +9 V power supply voltage with a voltage supervisory circuit. If this
power supply exceeds its specified limit, the PWR LED turns off indicating a power fault condition.
External power output
Table 4. External power output specifications
Parameter Conditions Specification
External power output - current range
4.0 A max.
External power output (Note 2)
Voltage drop between power input
and daisy chain power output
0.5 V max
Note 2: The daisy chain power output option allows multiple MCC USB products to be powered from a single external
power source in a daisy chain fashion. The voltage drop between the device power supply input and the daisy
chain output is 0.5 V max. Users must plan for this drop to ensure the last module in the chain will receive at
least 6.0 VDC.
USB specifications
Table 5. USB specifications
USB "B" connector
Input
USB device type
USB 2.0 (full-speed)
Device compatibility
USB 1.1, USB 2.0 (hardware revision G and later are also compatible with
USB 3.0; see Note 1 for information on how to determine the hardware
revision)
USB "A" connector
Downstream hub output port
USB hub type
Supports USB 2.0 high-speed, full-speed and low-speed operating points
Self-powered, 100 mA max downstream VBUS capability
Compatible products
MCC USB Series devices
USB cable type (upstream and
downstream)
A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG VBUS/GND, min
28 AWG D+/D-)
USB cable length
3 meters max.
Note 1: The board revision may be determined from the part number label on the housing that states "193773X-01L,"
where X is the board revision.
Relay contact pull-up/down option
Table 6. Relay pull-up/pull-down specifications
R35, R36, R41, R43, R45, R47, R49, R51, R87, R89, R91, R93, R96, R98,
R100, R102, R103, R105, R107, R109, R112, R114, R116, R118
Relays NO contact pull-up (to USB +5 V) /
pull-down, user installed.
R37, R40, R42, R44, R46, R48, R50, R52, R88, R90, R92, R94, R95, R97,
R99, R101, R104, R106, R108, R110, R111, R113, R115, R117
Relays NC contact pull-up (to USB +5 V) /
pull-down, user installed

USB-ERB24 User's Guide Specifications
16
Mechanical
Table 7. Mechanical specifications
Board dimensions (L × W × H)
431.8 × 121 × 20.3 mm (17.0 × 4.8 × 0.8 in.)
Enclosure dimensions (L × W × H)
482.6 × 125.7 × 58.9 mm (19.00 × 4.95 × 2.32 in.)
Environmental
Table 8. Environmental specifications
Operating temperature range
0 to 70 °C
Storage temperature range
-40 to 100 °C
Humidity
0 to 95% non-condensing
Main connector
Table 9. Main connector specifications
Connector type
Screw terminal
Wire gauge range
12 to 22 AWG

USB-ERB24 User's Guide Specifications
17
Screw terminal pinout
Table 10. Screw terminal pinout
Pin
Signal Name
1-NC
Relay 1 Normally Closed contact
1-C
Relay 1 Common contact
1-NO
Relay 1 Normally Open contact
2-NC
Relay 2 Normally Closed contact
2-C
Relay 2 Common contact
2-NO
Relay 2 Normally Open contact
3-NC
Relay 3 Normally Closed contact
3-C
Relay 3 Common contact
3-NO
Relay 3 Normally Open contact
4-NC
Relay 4 Normally Closed contact
4-C
Relay 4 Common contact
4-NO
Relay 4 Normally Open contact
5-NC
Relay 5 Normally Closed contact
5-C
Relay 5 Common contact
5-NO
Relay 5 Normally Open contact
6-NC Relay 6 Normally Closed contact
6-C
Relay 6 Common contact
6-NO
Relay 6 Normally Open contact
7-NC
Relay 7 Normally Closed contact
7-C
Relay 7 Common contact
7-NO
Relay 7 Normally Open contact
8-NC
Relay 8 Normally Closed contact
8-C
Relay 8 Common contact
8-NO
Relay 8 Normally Open contact
9-NC
Relay 9 Normally Closed contact
9-C
Relay 9 Common contact
9-NO Relay 9 Normally Open contact
10-NC
Relay 10 Normally Closed contact
10-C
Relay 10 Common contact
10-NO
Relay 10 Normally Open contact
11-NC
Relay 11 Normally Closed contact
11-C
Relay 11 Common contact
11-NO
Relay 11 Normally Open contact
12-NC
Relay 12 Normally Closed contact
12-C
Relay 12 Common contact
12-NO
Relay 12 Normally Open contact
13-NC
Relay 13 Normally Closed contact
13-C
Relay 13 Common contact
13-NO
Relay 13 Normally Open contact
14-NC
Relay 14 Normally Closed contact
14-C
Relay 14 Common contact
14-NO
Relay 14 Normally Open contact
15-NC
Relay 15 Normally Closed contact
15-C
Relay 15 Common contact
15-NO
Relay 15 Normally Open contact
16-NC
Relay 16 Normally Closed contact
16-C
Relay 16 Common contact
16-NO
Relay 16 Normally Open contact
17-NC
Relay 17 Normally Closed contact
17-C
Relay 17 Common contact
17-NO
Relay 17 Normally Open contact
18-NC
Relay 18 Normally Closed contact
18-C
Relay 18 Common contact

USB-ERB24 User's Guide Specifications
18
Pin
Signal Name
18-NO
Relay 18 Normally Open contact
19-NC
Relay 19 Normally Closed contact
19-C
Relay 19 Common contact
19-NO
Relay 19 Normally Open contact
20-NC
Relay 20 Normally Closed contact
20-C
Relay 20 Common contact
20-NO
Relay 20 Normally Open contact
21-NC
Relay 21 Normally Closed contact
21-C
Relay 21 Common contact
21-NO
Relay 21 Normally Open contact
22-NC
Relay 22 Normally Closed contact
22-C
Relay 22 Common contact
22-NO
Relay 22 Normally Open contact
23-NC
Relay 23 Normally Closed contact
23-C
Relay 23 Common contact
23-NO
Relay 23 Normally Open contact
24-NC Relay 24 Normally Closed contact
24-C
Relay 24 Common contact
24-NO
Relay 24 Normally Open contact

Declaration of Conformity
According to ISO/IEC 17050-1:2010
Manufacturer: Measurement Computing Corporation
Address: 10 Commerce Way
Norton, MA 02766
USA
Product Category: Electrical equipment for measurement, control and laboratory use.
Date and Place of Issue: May 3, 2016, Norton, Massachusetts USA
Test Report Number: EMI4221.05
Measurement Computing Corporation declares under sole responsibility that the product
USB-ERB24
Complies with the essential requirements of the following applicable European Directives:
Electromagnetic Compatibility (EMC) Directive 2004/108/EC
Low Voltage Directive 2006/95/EC
RoHS Directive 2011/65/EU
Conformity is assessed in accordance to the following standards:
EMC:
Emissions:
EN 61326-1:2013 (IEC 61326-1:2012), Class A
EN 55011: 2009 + A1:2010 (IEC CISPR 11:2009 + A1:2010), Group 1, Class A
Immunity:
EN 61326-1:2013 (IEC 61326-1:2012), Controlled EM Environments
EN 61000-4-2:2008 (IEC 61000-4-2:2008)
EN 61000-4-3 :2010 (IEC61000-4-3:2010)
Safety:
EN 61010-1 (IEC 61010-1)
Environmental Affairs:
Articles manufactured on or after the Date of Issue of this Declaration of Conformity do not contain any of the
restricted substances in concentrations/applications not permitted by the RoHS Directive.
Carl Haapaoja, Director of Quality Assurance

Measurement Computing Corporation NI Hungary Kft
10 Commerce Way H-4031 Debrecen, Hátar út 1/A, Hungary
Norton, Massachusetts 02766 Phone: [phone]
[phone] Fax: [phone]
Fax: [phone] http://hungary.ni.com/debrecen
E-mail: [e-mail]
www.mccdaq.com