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Measurement Computing USB-PDISO8 User Manual

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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........................................................................................................... 1-1

Software features ............................................................................................................................................ 1-1

USB-PDISO8 block diagram.......................................................................................................................... 1-2

Connecting a USB-PDISO8 to your computer is easy ................................................................................... 1-2

Chapter 2

Installing the USB-PDISO8............................................................................................................... 2-1

What comes with your USB-PDISO8 shipment? ........................................................................................... 2-1

Hardware ....................................................................................................................................................................... 2-1

Additional documentation.............................................................................................................................................. 2-2

Unpacking the USB-PDISO8 ......................................................................................................................... 2-2

Installing the software .................................................................................................................................... 2-2

Installing the USB-PDISO8............................................................................................................................ 2-2

Connecting the external power supply........................................................................................................................... 2-2

Connecting the USB-PDISO8 to your system ............................................................................................................... 2-3

Chapter 3

Functional Details ............................................................................................................................. 3-1

Internal components ....................................................................................................................................... 3-1

Direct current (dc) power connector and +9 V power supply ........................................................................................ 3-1

USB OUT connector...................................................................................................................................................... 3-2

USB IN connector.......................................................................................................................................................... 3-2

External power connectors............................................................................................................................................. 3-2

USB LED....................................................................................................................................................................... 3-2

PWR LED...................................................................................................................................................................... 3-2

Screw terminals and relays ............................................................................................................................................ 3-3

Main connector and pin out ............................................................................................................................ 3-3

Relay contact terminals (0 - NC, C, N0 through 7- NC, C, N0)..................................................................................... 3-4

Differential isolated digital input terminals (IP0A to IP7B) .......................................................................................... 3-5

Daisy chaining additional modules to the USB-PDISO8 ............................................................................... 3-6

Power limitations using multiple USB-PDISO8 devices................................................................................ 3-7

Supply current................................................................................................................................................................ 3-7

Voltage drop .................................................................................................................................................................. 3-7

Relay contact protection circuit for inductive loads....................................................................................................... 3-8

Chapter 4

Specifications.................................................................................................................................... 4-1

Relay specification ......................................................................................................................................... 4-1

Isolated inputs................................................................................................................................................. 4-1

Power.............................................................................................................................................................. 4-2

USB specifications ......................................................................................................................................... 4-2

Mechanical ..................................................................................................................................................... 4-3

Environmental ................................................................................................................................................ 4-3

Main connector............................................................................................................................................... 4-3

Screw terminal pinouts ................................................................................................................................... 4-3

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