Measurement Computing USB-ERB24 - Manual (Page 5)

Table of Contents
Preface
About this User’s Guide ......................................................................................................................vi
What you will learn from this user’s guide........................................................................................................vi
Conventions in this user’s guide........................................................................................................................vi
Where to find more information ........................................................................................................................vi
Chapter 1
Introducing the USB-ERB24............................................................................................................. 1-1
Overview: USB-ERB24 features.................................................................................................................... 1-1
USB-ERB24 block diagram ........................................................................................................................... 1-2
Software features ............................................................................................................................................ 1-2
Connecting a USB-ERB24 to your computer is easy ..................................................................................... 1-3
Chapter 2
Installing the USB-ERB24................................................................................................................. 2-1
What comes with your USB-ERB24 shipment?............................................................................................. 2-1
Hardware ....................................................................................................................................................................... 2-1
Additional documentation.............................................................................................................................................. 2-1
Unpacking the USB-ERB24 ........................................................................................................................... 2-2
Installing the software .................................................................................................................................... 2-2
Installing the USB-ERB24 ............................................................................................................................. 2-2
Configuring the hardware switches................................................................................................................................ 2-2
Connecting the external power supply ........................................................................................................................... 2-3
Connecting the USB-ERB24 to your system ................................................................................................................. 2-4
Chapter 3
Functional Details ............................................................................................................................. 3-1
Internal components ....................................................................................................................................... 3-1
USB in connector........................................................................................................................................................... 3-1
USB out connector......................................................................................................................................................... 3-1
External power connectors............................................................................................................................................. 3-1
USB LED....................................................................................................................................................................... 3-2
PWR LED...................................................................................................................................................................... 3-2
Invert/non-invert switch (S1) ......................................................................................................................................... 3-2
Pull-up/pull-down switch (S2) ....................................................................................................................................... 3-3
Screw terminals.............................................................................................................................................................. 3-3
Daisy chaining additional relays to the USB-ERB24 ..................................................................................... 3-3
Power limitations using multiple USB-ERB24 devices ................................................................................. 3-4
Voltage drop .................................................................................................................................................................. 3-4
Relay configuration ........................................................................................................................................ 3-4
Relay contact protection circuit for inductive loads....................................................................................................... 3-5
Chapter 4
Specifications.................................................................................................................................... 4-1
Output specifications ...................................................................................................................................... 4-1
Power.............................................................................................................................................................. 4-1
External power input ...................................................................................................................................... 4-2
External power output .................................................................................................................................... 4-2
USB specifications ......................................................................................................................................... 4-2
Relay contact pull-up/down option................................................................................................................. 4-3
Mechanical ..................................................................................................................................................... 4-3
Environmental ................................................................................................................................................ 4-3
iv