National Instruments DAQ PCI-4451 User Manual page 5

Contents
Device and RTSI Clocks................................................................................. 3-11
Selecting Sample/Update Clock Frequency .................................................................. 3-12
Device Configuration Issues.......................................................................................... 3-13
Chapter 4
Signal Connections
I/O Connectors............................................................................................................... 4-1
Analog I/O Connector Signal Descriptions .................................................... 4-2
Digital I/O Connector Signal Descriptions ..................................................... 4-5
Analog Input Signal Connections.................................................................................. 4-9
Types of Signal Sources ................................................................................................ 4-10
Floating Signal Sources .................................................................................. 4-10
Ground-Referenced Signal Sources ................................................................ 4-10
Analog Output Signal Connections ............................................................................... 4-11
Analog Power Connections ........................................................................................... 4-12
Digital I/O Signal Connections ..................................................................................... 4-12
Digital Power Connections............................................................................................ 4-14
Timing Connections ...................................................................................................... 4-14
Programmable Function Input Connections ................................................... 4-14
Acquisition Timing Connections .................................................................... 4-15
Waveform Generation Timing Connections ................................................... 4-18
General-Purpose Timing Signal Connections................................................. 4-19
Field Wiring Considerations.......................................................................................... 4-24
PCI-4451/4452 User Manual
PFI0/TRIG1 (EXT_TRIG) Signal .................................................... 4-16
PFI1/TRIG2 (PRETRIG) Signal ...................................................... 4-17
CONVERT* Signal .......................................................................... 4-17
EXTSTROBE* Signal ...................................................................... 4-18
WFTRIG Signal................................................................................ 4-18
UPDATE* Signal ............................................................................. 4-18
GPCTR0_SOURCE Signal .............................................................. 4-19
GPCTR0_GATE Signal ................................................................... 4-20
GPCTR0_OUT Signal ...................................................................... 4-20
GPCTR0_UP_DOWN Signal........................................................... 4-20
GPCTR1_SOURCE Signal .............................................................. 4-21
GPCTR1_GATE Signal ................................................................... 4-21
GPCTR1_OUT Signal ...................................................................... 4-22
GPCTR1_UP_DOWN Signal........................................................... 4-22
FREQ_OUT Signal........................................................................... 4-24
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