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 ..................................
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.
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.
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.
PWR IN Plug the AC adapter into a power outlet. 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 LED does not turn on.
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: Unplug the USB cable from the USB-ERB24. Unplug the external power cord from the connector on the enclosure.
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 ...
A user-supplied custom cable is required to daisy chain multiple devices. USB LED 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.
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.
USB-ERB24 User's Guide Functional Details 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.
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.
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 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...
+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.
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...
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