Measurement Computing USB-PDISO8/40 - Manual (Page 4)

Table of Contents
About this User's Guide .......................................................................................................................v
What you will learn from this user's guide .........................................................................................................v
Conventions in this user's guide .........................................................................................................................v
Where to find more information.........................................................................................................................v
Chapter 1
Introducing the USB-PDISO8/40 ...................................................................................................... 1-1
Software features ............................................................................................................................................ 1-1
USB-PDISO8/40 block diagram..................................................................................................................... 1-2
Connecting a USB-PDISO8/40 to your computer is easy .............................................................................. 1-2
Chapter 2
Installing the USB-PDISO8/40 .......................................................................................................... 2-1
What comes with your USB-PDISO8/40 shipment? ...................................................................................... 2-1
Hardware ....................................................................................................................................................................... 2-1
Additional documentation.............................................................................................................................................. 2-2
Optional components ..................................................................................................................................................... 2-2
Unpacking the USB-PDISO8/40 .................................................................................................................... 2-2
Installing the software .................................................................................................................................... 2-2
Installing the USB-PDISO8/40....................................................................................................................... 2-2
Connecting the external power supply........................................................................................................................... 2-2
Connecting the USB-PDISO8/40 to your system .......................................................................................................... 2-3
Connecting the board for I/O operations ........................................................................................................ 2-4
Connectors, cables – main I/O connector....................................................................................................................... 2-4
Pin out – main I/O connector ......................................................................................................................................... 2-4
Cabling........................................................................................................................................................................... 2-4
Field wiring and signal termination accessories............................................................................................................. 2-5
Chapter 3
Functional Details ............................................................................................................................. 3-1
Internal components ....................................................................................................................................... 3-1
USB OUT connector...................................................................................................................................................... 3-1
USB IN connector.......................................................................................................................................................... 3-1
External power connectors............................................................................................................................................. 3-2
USB LED....................................................................................................................................................................... 3-2
PWR LED...................................................................................................................................................................... 3-2
Direct current (dc) power connector and +9 V power supply......................................................................... 3-2
Daisy chaining additional modules to the USB-PDISO8/40 .......................................................................... 3-3
Power limitations using multiple USB-PDISO8/40 devices........................................................................... 3-3
Supply current................................................................................................................................................................ 3-3
Voltage drop .................................................................................................................................................................. 3-4
Relay contact protection circuit for inductive loads....................................................................................................... 3-4
Chapter 4
Specifications .................................................................................................................................... 4-1
Relay specifications........................................................................................................................................ 4-1
Isolated inputs................................................................................................................................................. 4-1
Power.............................................................................................................................................................. 4-2
USB specifications ......................................................................................................................................... 4-2
Mechanical ..................................................................................................................................................... 4-2
Environmental ................................................................................................................................................ 4-3
Main connector and pinout ............................................................................................................................. 4-3
P14................................................................................................................................................................................. 4-3
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