National Instruments NI PCI-8254R - Manual (Page 6)

© National Instruments Corporation vii NI PCI-8254R User Manual
Contents
Chapter 1
Introduction
Software Overview ........................................................................................................1-1
Vision Builder for Automated Inspection .......................................................1-2
Vision Development Module ..........................................................................1-2
IEEE 1394 and NI 8254R ..............................................................................................1-3
Functional Overview......................................................................................................1-3
Start Conditions .............................................................................................................1-4
Acquisition Window Control.........................................................................................1-4
Chapter 2
Digital I/O
RIO and LabVIEW FPGA .............................................................................................2-1
TTL Inputs and Outputs.................................................................................................2-2
Isolated Inputs and Outputs ...........................................................................................2-3
I/O for Normal Operation ..............................................................................................2-4
Trigger Inputs ..................................................................................................2-5
Timed Pulse Output.........................................................................................2-5
Initiating a Timed Pulse ....................................................................2-5
Pulse Modes ......................................................................................2-6
Pulse Delay .......................................................................................2-6
Pulse Width .......................................................................................2-7
Trigger Polarity .................................................................................2-7
Trigger Change Detectors................................................................................2-8
Quadrature Encoder.........................................................................................2-8
Product Selection Port .....................................................................................2-8
Using ISO Input 5 as a Latch ............................................................2-9
General-Purpose I/O ........................................................................................2-9
General-Purpose Inputs.....................................................................2-9
General-Purpose Outputs ..................................................................2-10
I/O for Fault Conditions ..................................................................................2-10
Shutdown ..........................................................................................2-11
Watchdog Timer ...............................................................................2-11
Considerations When Connecting the Digital I/O .........................................................2-12
Wiring an Isolated Input to a Sourcing Output Device ...................................2-12
Wiring an Isolated Output to an External Load...............................................2-13
Protecting Inductive Loads..............................................................................2-14
Transmission Line Effects ...............................................................................2-15