Measurement Computing USB-PDISO8 - 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........................................................................................................... 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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