National Instruments USB-621 Series User Manual page 8

Contents
AO Pause Trigger Signal ................................................................................ 5-6
AO Sample Clock Signal ................................................................................ 5-8
AO Sample Clock Timebase Signal................................................................ 5-9
Getting Started with AO Applications in Software....................................................... 5-10
Chapter 6
Digital I/O
Digital I/O on USB-6210/6211/6215/6218 Devices ..................................................... 6-1
Static DIO on USB-6210/6211/6215/6218 Devices ....................................... 6-2
I/O Protection on USB-6210/6211/6215/6218 Devices.................................. 6-2
Increasing Current Drive on USB-6210/6211/6215/6218 Devices ................ 6-3
Connecting Digital I/O Signals on USB-6210/6211/6215/6218 Devices....... 6-3
Getting Started with DIO Applications in Software on
USB-6210/6211/6215/6218 Devices ........................................................... 6-4
Digital I/O on USB-6212/6216 Devices........................................................................ 6-4
Static DIO on USB-6212/6216 Devices ......................................................... 6-5
I/O Protection on USB-6212/6216 Devices.................................................... 6-5
Programmable Power-Up States on USB-6212/6216 Devices ....................... 6-6
Increasing Current Drive on USB-6212/6216 Devices................................... 6-6
Connecting Digital I/O Signals on USB-6212/6216 Devices......................... 6-6
Getting Started with DIO Applications in Software on
USB-6212/6216 Devices.............................................................................. 6-7
Chapter 7
PFI
Using PFI Terminals as Timing Input Signals .............................................................. 7-2
Exporting Timing Output Signals Using PFI Terminals............................................... 7-3
Using PFI Terminals as Static Digital I/Os ................................................................... 7-3
Connecting PFI Input Signals........................................................................................ 7-4
PFI Filters ...................................................................................................................... 7-4
I/O Protection ................................................................................................................ 7-6
Programmable Power-Up States.................................................................................... 7-6
NI USB-621x User Manual
Using a Digital Source...................................................................... 5-7
Using an Internal Source .................................................................. 5-8
Using an External Source ................................................................. 5-8
Routing AO Sample Clock to an Output Terminal .......................... 5-8
Other Timing Requirements ............................................................. 5-8
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