National Instruments NI PCI-6110, NI PCI-6111 AIGATE Signal

Chapter 4 Connecting Signals

© National Instruments Corporation 4-25 NI PCI-6110/6111 User Manual

Figure 4-18. CONVERT* Output Signal Timing

The ADC switches to hold mode within 20ns of the selected edge. This

hold-mode delay time is a function of temperature and does not vary from

one conversion to the next.

The SI2 on the NI PCI-6110/6111 normally generates CONVERT* unless

you select some external source. The counter is started by the

STARTSCAN signal and continues to count down and reload itself until the

scan is finished. It then reloads itself in preparation for the next

STARTSCAN pulse.

A/D conversions generated by either an internal or external CONVERT*

signal are inhibited unless they occur within a DAQ sequence. Scans

occurring within a DAQ sequence may be gated by either the hardware

(AIGATE) signal or software command register gate.

AIGATE Signal

Any PFI pin can receive as an input the AIGATE signal, which is not

available as an output on the I/O connector. The AIGATE signal can mask

off scans in a DAQ sequence. You can configure the PFI pin you select as

the source for the AIGATE signal in either the level-detection or

edge-detection mode. You can configure the polarity selection for the

PFIpin for either active high or active low.

In the level-detection mode if AIGATE is active, the STARTSCAN signal

is masked off and no scans can occur. In the edge-detection mode, the first

active edge disables the STARTSCAN signal, and the second active edge

enables STARTSCAN.

AIGATE can neither stop a scan in progress nor continue a previously

gated-off scan. Once a scan has started, AIGATE does not gate off

conversions until the beginning of the next scan and, conversely, if

conversions are being gated off, AIGATE does not gate them back on until

the beginning of the next scan.

t

w

= 50 to 100 ns

t

w

Contents

Main Page Important Information Warranty Copyright Trademarks Patents Compliance FCC/Canada Radio Frequency Interference Compliance Determining FCC Class FCC/DOC Warnings Class A Contents Chapter 4 Connecting Signals Page About This Manual Conventions National Instruments Documentation Related Documentation Introduction About the NI PCI-6110/6111 What You Need to Get Started Software Programming Choices NI-DAQ National Instruments ADE Software Optional Equipment Custom Cabling Unpacking Safety Information Page Page Installing and Configuring the NI PCI-6110/6111 Installing the Software Installing the Hardware Configuring the Device National Instruments Corporation 3-1 NI PCI-6110/6111 User Manual Hardware Overview DAQ - STC RTSI Bus Figure 3-1. NI PCI-6110 Block Diagram I/O Connector Analog Input Input Mode Note The inputs are differential only in the sense that the ground loops are broken. The I/O Connector RTSI Bus Input Polarity and Input Range Considerations for Selecting Input Ranges Input Coupling Analog Output Analog Trigger Figure 3-3. Analog Trigger Block Diagram for the NI PCI-6110 Figure 3-4. Analog Trigger Block Diagram for the NI PCI-6111 Page Page Digital I/O Timing Signal Routing Page Programmable Function Inputs Device and RTSI Clocks RTSI Triggers Connecting Signals I/O Connector Figure 4-1. 68-Pin I/O Connector Pin Assignment for the NI PCI-6110/6111 Figure 4-2. 50-Pin Connector Pin Assignments for the NI PCI-61 10/6111 I/O Connector Signal Descriptions Table 4-2. Signal Descriptions for I/O Connector Pins Page Page Table 4-3. I/O Signal Summary for the NI PCI-6110/6111 Table 4-3. I/O Signal Summary for the NI PCI-6110/6111 (Continued) Connecting Analog Input Signals Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Differential Measurements Differential Connection Considerations Differential Connections for Ground-Referenced Signal Sources Figure 4-4. Differential Input Connections for G round-Referenced Signals Differential Connections for Nonreferenced or Floating Signal Sources Common-Mode Signal Rejection Considerations Working Voltage Range Analog Output Signal Connections Digital I/O Signal Connections Power Connections Timing Connections Programmable Function Input Connections DAQ Timing Connections TRIG1 Signal TRIG2 Signal Page STARTSCAN Signal Page CONVERT* Signal AIGATE Signal SISOURCE Signal SCANCLK Signal EXTSTROBE* Signal Waveform Generation Timing Connections WFTRIG Signal UPDATE* Signal UISOURCE Signal General-Purpose Timing Signal Connections GPCTR0_SOURCE Signal GPCTR0_GATE Signal GPCTR0_OUT Signal GPCTR0_UP_DOWN Signal GPCTR1_SOURCE Signal GPCTR1_GATE Signal GPCTR1_OUT Signal GPCTR1_UP_DOWN Signal Page FREQ_OUT Signal Field Wiring Considerations Page Calibration Loading Calibration Constants Self-Calibration External Calibration A Specifications Analog Input Input Characteristics Accuracy Information Transfer Characteristics Amplifier Characteristics Dynamic Characteristics Stability Analog Output Output Characteristics Transfer Characteristics Voltage Output Dynamic Characteristics Stability Digital I/O Timing I/O General-Purpose Up/Down Counter/Timers Frequency Scaler Triggers Analog Trigger Digital Trigger External Input for Digital or Analog Trigger (PFI0/TRIG1) Page Environmental Safety Electromagnetic Compatibility CE Compliance Page Figure B-1. 68-Pin Connector Pin Assignment for the NI PCI-611 0/6111 Figure B-2. 50-Pin Connector Pin Assignment for the NI PCI-611 0/6111 C Common Questions General Information Installing and Configuring Analog Input and Output Timing and Digital I/O Page Page D Technical Support and Professional Services Page Glossary Numbers/Symbols A B C D E F G H I K L M N O P Page R S T U V W Index Symbols Numerics A B C D E F G H I K L M N O Q R S T U V W