![background image](http://html1.mh-extra.com/html/keithley/7021/7021_instruction-manual_3946848010.webp)
3
Digital I/O Configuration
Introduction ......................................................................................................................................................... 3-1
Digital outputs ..................................................................................................................................................... 3-1
Controlling pull-up devices ................................................................................................................................. 3-1
Controlling devices using pull-up resistors ......................................................................................................... 3-2
Digital inputs ....................................................................................................................................................... 3-3
4
Card Connections and Installation
Introduction ......................................................................................................................................................... 4-1
Handling precautions........................................................................................................................................... 4-1
Multiplexer connections ...................................................................................................................................... 4-2
Backplane row jumpers ............................................................................................................................... 4-2
Bankplane row jumper removal .................................................................................................................. 4-2
Bankplane row jumper installation.............................................................................................................. 4-2
Bank-to-bank jumpers ..................................................................................................................................4-3
Digital I/O connections........................................................................................................................................ 4-3
Voltage source jumper................................................................................................................................. 4-3
Pull-up resistors ........................................................................................................................................... 4-4
Configuring digital I/O output logic............................................................................................................ 4-4
Configuring digital I/O input pull-up resistance ......................................................................................... 4-5
Multi-pin (mass termination) connector card ...................................................................................................... 4-5
Typical multiplexer connection schemes ............................................................................................................ 4-9
Single-card system..................................................................................................................................... 4-10
Two-card system ....................................................................................................................................... 4-11
Two-mainframe system ............................................................................................................................. 4-12
Typical digital I/O connection schemes ............................................................................................................ 4-14
Output connection schemes ....................................................................................................................... 4-14
Input connection scheme ........................................................................................................................... 4-15
Model 7021 installation and removal ................................................................................................................ 4-16
Card installation..........................................................................................................................................4-16
Card removal ..............................................................................................................................................4-16
5
Operation
Introduction ......................................................................................................................................................... 5-1
Power limits......................................................................................................................................................... 5-1
Analog multiplexer maximum signal levels................................................................................................ 5-1
Digital I/O maximum signal levels.............................................................................................................. 5-1
Mainframe control of the card ............................................................................................................................. 5-1
Channel assignments ................................................................................................................................... 5-2
Closing and opening channels ..................................................................................................................... 5-4
Scanning channels ....................................................................................................................................... 5-4
Reading input channels................................................................................................................................ 5-4
IEEE-488 bus operation .............................................................................................................................. 5-5
Multiplexer switching examples.......................................................................................................................... 5-6
Resistor testing ............................................................................................................................................ 5-6
Transistor testing ....................................................................................................................................... 5-10
Testing with matrix-digital I/O cards .........................................................................................................5-12
ii
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
Summary of Contents for 7021
Page 86: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...
Page 87: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...
Page 88: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...
Page 89: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...
Page 90: ...Artisan Scientific Quality Instrumentation Guaranteed 888 88 SOURCE www artisan scientific com...