User's Manual

Contents
DAQCard-1200 User Manual viii ni.com
Chapter 3
Connecting the Signals
I/O Connector ................................................................................................................ 3-1
Signal Connection Descriptions .................................................................................... 3-3
Connecting Analog Input Signals ................................................................... 3-4
Types of Signal Sources ................................................................... 3-6
Floating Signal Sources...................................................... 3-6
Ground-Referenced Signal Sources ................................... 3-6
Input Configurations......................................................................... 3-7
Differential Connection Considerations
(DIFF Input Mode).......................................................... 3-7
Single-Ended Connection Considerations
(RSE and NRSE Input Modes)........................................ 3-11
Common-Mode Signal Rejection Considerations.............. 3-13
Connecting Analog Output Signals................................................................. 3-14
Connecting Digital I/O Signals ....................................................................... 3-15
Port C Pin Connections..................................................................... 3-17
Timing Specifications....................................................................... 3-18
Mode 1 Input Timing ......................................................... 3-19
Mode 1 Output Timing....................................................... 3-20
Mode 2 Bidirectional Timing............................................. 3-20
Connecting Analog I/O and General-Purpose Timing Signals....................... 3-22
Analog Input Timing Connections ................................................... 3-22
Analog Output Timing Connections................................................. 3-26
General-Purpose Timing Connections.............................................. 3-27
Connecting the Power ..................................................................................... 3-31
Chapter 4
Theory of Operation
Functional Overview ..................................................................................................... 4-1
PC Card I/O Channel Interface Circuitry ...................................................................... 4-2
Timing ........................................................................................................................... 4-3
Analog Input.................................................................................................................. 4-5
Analog Input Circuitry .................................................................................... 4-6
Data Acquisition Timing................................................................................. 4-8
Data Acquisition Operation .............................................................. 4-8
Round-Robin Data Acquisition ........................................................ 4-8
Interval Data Acquisition.................................................................. 4-8
Data Acquisition Rates.................................................................................... 4-9