Measurement Computing USB-4302 - Manual (Page 5)

5
Table of Contents
Preface
About this User's Guide ....................................................................................................................... 7
What you will learn from this user's guide ......................................................................................................... 7
Conventions in this user's guide ........................................................................................................................................ 7
Where to find more information ......................................................................................................................... 7
Chapter 1
Introducing the USB-4302 .................................................................................................................... 8
Software features ................................................................................................................................................ 8
Connecting a USB-4302 to your computer is easy ............................................................................................. 8
Chapter 2
Installing the USB-4302 ........................................................................................................................ 9
What comes with your USB-4302 shipment? ..................................................................................................... 9
Hardware .......................................................................................................................................................................... 9
Additional documentation ................................................................................................................................................. 9
Unpacking the USB-4302 ................................................................................................................................... 9
Installing the software ...................................................................................................................................... 10
Installing the USB-4302 ................................................................................................................................... 10
Connecting the board for I/O operations .......................................................................................................... 10
Connectors, cables – main I/O connector .........................................................................................................................10
Pin out – main I/O connector ...........................................................................................................................................11
Cables ..............................................................................................................................................................................11
Field wiring, signal termination and conditioning ...........................................................................................................12
Chapter 3
Functional Details ............................................................................................................................... 13
USB-4302 block diagram ................................................................................................................................. 13
Components ...................................................................................................................................................... 14
USB connector .................................................................................................................................................................14
Status LED .......................................................................................................................................................................14
Power LED ......................................................................................................................................................................14
Connector P1 ...................................................................................................................................................................14
Signal connections ............................................................................................................................................ 15
Counter input, gate, and output ........................................................................................................................................15
Digital input and output (DIn, DOn) ................................................................................................................................15
Digital input pull-up/down configuration (DI CTL) ........................................................................................................15
Interrupt input (INT) ........................................................................................................................................................15
Oscillator output (OSC OUT) ..........................................................................................................................................16
Ground (GND) .................................................................................................................................................................16
Oscillator output ............................................................................................................................................... 16
Internal sources ................................................................................................................................................................16
External sources ...............................................................................................................................................................16
Divider .............................................................................................................................................................................17
Counter operation ............................................................................................................................................. 17
Count source ....................................................................................................................................................................17
Gate control .....................................................................................................................................................................17
Counting modes ................................................................................................................................................ 18
Reload ..............................................................................................................................................................................18
Recycle ............................................................................................................................................................................18
BCD/Binary mode ...........................................................................................................................................................18
The "Special" gate............................................................................................................................................................19
Output control ..................................................................................................................................................................19
Example 1 ........................................................................................................................................................................19
Example 2 ........................................................................................................................................................................20