User Manual

ManualsBrandsJuniper Systems ManualsEquipmentAllegro DAQ

Data Acquisition Expansion Pod 1

Data Acquisition

Expansion Pod

™

User’s Guide

Contents

Chapter 1: Introduction ................................................. 2

Physical Description ...........................................................................2

DAQPod Features ..............................................................................2

Chapter 2: Before Connecting the Data Acquisition

Expansion Pod ............................................................... 3

Compatible Data Acquisition Cards ....................................................3

Recommended Mating Connector ......................................................3

Understanding Signal Differences from Standard E Series Devices ..3

NI DAQCard signals not available with the DAQ

Expansion Pod ......................................................................4

Sensor excitation .........................................................................4

Chapter 3: Connecting the Expansion Pod ................. 6

Connector Diagram and Pinout Chart ................................................6

Recommended Software to Gather and Analyze Data .......................7

Chapter 4: Finding More Information ........................... 9

Chapter 5: Signal Descriptions .................................. 10

I/O Connector Signal Descriptions ..................................................10

Chapter 6: Configuration Switches ............................ 15

Default Switch Settings ....................................................................15

Conﬁguring Switches ........................................................................16

Continuously enable the Sensor Excitation Output ...................16

Use DIO7 to enable/disable Sensor Excitation Output ..............17

Bypass the Sensor Excitation (Output Analog Out 0 rather than

the Sensor Excitation) .........................................................17

Enable current limit monitoring ..................................................18

Disable current limit monitoring and reconnect the PFI5 signal

to the 50-pin connector .......................................................18

Locating Switches on the Schematic ................................................19

Appendix: DAQ Expansion Pod Schematic ............... 20

Summary of content (28 pages)

PAGE 1
Data Acquisition Expansion Pod™ User’s Guide Contents Chapter 1: Introduction ................................................. 2 Physical Description ...........................................................................2 DAQPod Features ..............................................................................2 Chapter 2: Before Connecting the Data Acquisition Expansion Pod ............................................................... 3 Compatible Data Acquisition Cards ......................
PAGE 2
Chapter 1: Introduction The Allegro CX™, combined with the Data Acquisition Expansion Pod™ (“DAQ Expansion Pod™”), places the functionality of National Instruments’ DAQCard into the palm of your hand. The DAQ Expansion Pod maintains the environmental seal of the Allegro CX unit while still bringing you the interface capability of the NI DAQCard. The DAQ Expansion Pod takes advantage of the NI DAQCard’s wide range of data acquisition capabilities.
PAGE 3
Chapter 2: Before Connecting the Data Acquisition Expansion Pod This chapter contains instructions for connecting to the DAQ Expansion Pod. It tells you how to—  Find a compatible data acquisition card  Find the necessary mating connector  Recognize signal modiﬁcations Review this section before installing or running any software or making any connections to the expansion pod.
PAGE 4
rugged environmental seal. The connector’s large size makes wiring easy, and its universal design lets you integrate a variety of test and measurement applications. The standard NI DAQCard output is designed for a 68-pin connector; the D connector on the DAQ Expansion Pod only has 50-pins. This means that some of the NI E Series DAQCard signals do not connect with the 50-pin connector. The next section lists NI DAQCard signals that have been changed or eliminated to adapt to the 50-pin connector.
PAGE 5
CAUTION: Damage can occur to the Allegro CX or NI DAQCard if these constraints are not followed. 1) The output voltage must be between 0 and + 4.8V. Setting a negative voltage may damage the DAQ Expansion Pod excitation circuit. 2) Voltages too near supply rails (over 4.8V) will result in digital noise that adversely affects sensors. 3) Output current is limited to a maximum of 200mA.
PAGE 6
Chapter 3: Connecting the Expansion Pod This chapter provides the following:  A diagram of the 50-pin D connector  A chart with pinout assignments for the connector  Software recommendations for the DAQ Expansion Pod ▲ Connector Diagram and Pinout Chart The following diagram illustrates the pinout for the 50-pin D connector as viewed from the outside of the DAQ Expansion Pod. The chart on the next page shows the pinouts assigned to each row.
PAGE 7
Row 1 Row 2 Row 3 1 – DGND 18 – GPCTR0_OUT 34 – FREQ_OUT 2 – PFI8 19 – PFI7 35 – PFI6 3 – PFI9 20 – GPCTR1_OUT 36 – PFI5 4 – PFI4 21 – PFI3 37 – +5V 5 – PFI2 22 – DGND 38 – PFI1 6 – SCANCLK 23 – DIO2 39 – PFI0 7 – DIO7 24 – DIO3 40 – +5V 8 – DIO6 25 – DIO4 41 – DIO1 9 – DIO5 26 – DGND 42 – DIO0 10 – AIGND 27 – ACH14 43 – AIGND 11 – AISENSE 28 – ACH13 44 – ACH6 12 – AIGND 29 – ACH12 45 – ACH5 13 – DAC_1_OUT 30 – ACH11 46 – ACH4 14 – AIGND 31 – ACH10 47 – ACH3 15 –
PAGE 8
 Article: “What is the LabVIEW PDA module?” Site: http://www. ni.com/labview/what_is_pda  Article: “Build Rugged Mobile Test Instruments Using LabVIEW PDA and the Allegro CX” Site: http://zone.ni.com/devzone/conceptd.
PAGE 9
Chapter 4: Finding More Information To ﬁnd more information about the DAQ Expansion Pod, the Allegro CX, NI DAQCards, LabVIEW, or LabVIEW PDA, use the resources listed in the chart below. For help with . . . Data Acquisition Expansion Pod Contact Juniper Systems® Technical Support Phone: 435-753-1714, 8 am to 5 pm MST Email: techsupport@junipersys.com Allegro CX Juniper Systems, Inc.
PAGE 10
Chapter 5: Signal Descriptions ▲ I/O Connector Signal Descriptions The following table describes the signals found on the I/O connectors. The information is based on documentation provided in the National Instruments E Series help ﬁle (http://sine.ni.com/nips/cds/ view/p/lang/en/nid/1038).  NOTE: The ﬁrst two signals (SENSOR EXC and A1) have been added to the original chart to show the additional functions of the DAQ Expansion Pod.
PAGE 11
Signal name Reference Direction Description Standard National Instruments E Series DAQCard Signals AI SENSE — AO 1 AO GND Output Analog Channel 1 Output—This pin supplies the voltage output of AO channel 1. AO GND — AO Ground The AO voltages are referenced to these pins. All three ground references—AI GND, AO GND, and D GND—are connected on the device. D GND — Digital Ground These pins supply the reference for the digital signals at the I/O connector as well as the +5 VDC supply.
PAGE 12
Signal name Reference Direction Description PFI 1/AI D GND REF TRIG Input PFI 1—As an input, this pin is a PFI. Output AI Reference Trigger Signal—As an output, this pin is the ai/ ReferenceTrigger signal. In pretrigger applications, a lowto-high transition indicates the initiation of the posttrigger conversions. AI REF TRIG is not used in posttrigger applications. PFI 2/AI D GND CONV CLK Input PFI 2—As an input, this pin is a PFI.
PAGE 13
Signal name Reference PFI 5/AO SAMP CLK D GND PFI 6/AO START TRIG D GND Direction Description Input PFI 5—As an input, this pin is a PFI. Output AO Sample Clock Signal—As an output, this pin is the ao/ SampleClock signal. A high-to-low edge on AO SAMP indicates that the AO primary group is being updated. Input PFI 6—As an input, this pin is a PFI. Output AO Start Trigger Signal—As an output, this pin is the ao/ StartTrigger signal.
PAGE 14
Signal name Reference Direction Description CTR 0 OUT D GND Output Counter 0 Output Signal—As an output, this pin emits the Ctr0InternalOutput signal. CTR 1 OUT D GND Output Counter 1 Output Signal—This pin emits the Ctr1InternalOutput signal. FREQ OUT D GND Output Frequency Output Signal—This output is from the frequency generator. Table used with permission from National Instruments.
PAGE 15
Chapter 6: Conﬁguration Switches The conﬁguration switches in the DAQ Expansion Pod let you conﬁgure how the pod functions. This chapter describes the default settings of the switches and how to reconﬁgure them.  CAUTION: Incorrect conﬁguration may result in damage to the pod and to any connected peripheral device. Please review all of the information in this chapter before making conﬁguration changes.
PAGE 16
The chart below shows the name and default setting of each switch. Switch # Switch Name Default Setting 1 I_FLAG OFF 2 PFI5_OUT ON 3 OPA_EN_H OFF 4 DIO7_OUT ON 5 SENSOR_EXC ON 6 EXC_BYPASS OFF With the switches in their default positions, the DAQ Expansion Pod is conﬁgured as follows:  The current limit monitoring of the Sensor Excitation Output is disabled.  PFI 5 is connected directly to the 50-pin D connector.  The Sensor Excitation is enabled continuously.
PAGE 17
Switch # Name Setting Result Sensor Excitation control is enabled continuously 3 OPA_EN_H OFF 4 DIO7_OUT ON 5 SENSOR_EXC ON 6 EXC_BYPASS OFF The Sensor Excitation Output is enabled; the Sensor Excitation Bypass is disabled Use DIO7 to enable/disable Sensor Excitation Output The conﬁguration switches let you program the DIO7 to enable or disable the Sensor Excitation Output circuitry. Switch 3 conﬁgures DIO 7 as the Sensor Excitation enabler.
PAGE 18
Switch # Switch Name Switch Settings Result Sensor Excitation control is enabled continuously 3 OPA_EN_H OFF 4 DIO7_OUT ON 5 SENSOR_EXC OFF 6 EXC_BYPASS ON Sensor Excitation Output disabled; Sensor Excitation Bypass enabled  CAUTION: Switch 5 and Switch 6 should NEVER be in the “ON” position at the same time. This could damage the NI DAQCard. Enable current limit monitoring The internal circuitry of the Sensor Excitation Output provides a Current Limit Flag.
PAGE 19
▲ Locating Switches on the Schematic The Appendix shows a ﬁve-page schematic. The schematic provides an in-depth view of the DAQ Expansion Pod, including switch settings. A table at the beginning of the the Appendix lists each switch’s designator as it appears in the schematic.
PAGE 20
Appendix: DAQ Expansion Pod Schematic The next ﬁve pages shows the schematic used to build the DAQ Expansion Pod. The following table shows the reference designators associated with each conﬁguration switch in the schematic.
PAGE 21
                          
PAGE 22
                                                                            
PAGE 23
                                                                            
PAGE 24
                                                                              24 User’s Guide
PAGE 25
                                                    
PAGE 26
PAGE 27
PAGE 28
DAQCard, LabVIEW, LabVIEW PDA, NI DAQCard, and National Instruments are either trademarks or registered trademarks of National Instruments, Inc. in the United States and/or other countries. Positronic Industries is a registered trademark of Positronic Industries. Allegro CX, DAQ Expansion Pod, Data Acquisition Expansion Pod, and Juniper Systems are trademarks or registered trademarks of Juniper Systems, Inc. Information in this document is subject to change without notice. © 08-2006 Juniper Systems, Inc.