National Instruments Network Card NI 2590 2591 User Manual

Computer-Based  
Instruments  
NI 2590/2591 User Manual  
NI 2590/2591 User Manual  
November 2000 Edition  
Part Number 322387B-01  
 
 
Important Information  
Warranty  
The NI 2590 and NI 2591 switch modules and accessories are warranted against defects in materials and workmanship for a  
period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its  
option, repair or replace equipment that proves to be defective during the warranty period. This warranty includes parts and labor.  
The media on which you receive National Instruments software are warranted not to fail to execute programming instructions,  
due to defects in materials and workmanship, for a period of 90 days from date of shipment, as evidenced by receipts or other  
documentation. National Instruments will, at its option, repair or replace software media that do not execute programming  
instructions if National Instruments receives notice of such defects during the warranty period. National Instruments does not  
warrant that the operation of the software shall be uninterrupted or error free.  
A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside of  
the package before any equipment will be accepted for warranty work. National Instruments will pay the shipping costs of  
returning to the owner parts which are covered by warranty.  
National Instruments believes that the information in this document is accurate. The document has been carefully reviewed  
for technical accuracy. In the event that technical or typographical errors exist, National Instruments reserves the right to  
make changes to subsequent editions of this document without prior notice to holders of this edition. The reader should consult  
National Instruments if errors are suspected. In no event shall National Instruments be liable for any damages arising out of  
or related to this document or the information contained in it.  
EXCEPT AS SPECIFIED HEREIN, NATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AND SPECIFICALLY DISCLAIMS ANY  
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR  
NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER. NATIONAL  
INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS, OR INCIDENTAL OR  
CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. This limitation of the liability of National Instruments will  
apply regardless of the form of action, whether in contract or tort, including negligence. Any action against National Instruments  
must be brought within one year after the cause of action accrues. National Instruments shall not be liable for any delay in  
performance due to causes beyond its reasonable control. The warranty provided herein does not cover damages, defects,  
malfunctions, or service failures caused by owners failure to follow the National Instruments installation, operation, or  
maintenance instructions; owners modification of the product; owners abuse, misuse, or negligent acts; and power failure or  
surges, fire, flood, accident, actions of third parties, or other events outside reasonable control.  
Copyright  
Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical, including  
photocopying, recording, storing in an information retrieval system, or translating, in whole or in part, without the prior written  
consent of National Instruments Corporation.  
Trademarks  
CVI, IVI, LabVIEW, National Instruments, ni.com, and PXIare trademarks of National Instruments Corporation.  
Product and company names mentioned herein are trademarks or trade names of their respective companies.  
WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS  
(1) NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL  
OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL  
COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE  
EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN.  
(2) IN ANY APPLICATION, INCLUDING THE ABOVE, RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS  
CAN BE IMPAIRED BY ADVERSE FACTORS, INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL  
POWER SUPPLY, COMPUTER HARDWARE MALFUNCTIONS, COMPUTER OPERATING SYSTEM SOFTWARE  
FITNESS, FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION,  
INSTALLATION ERRORS, SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS, MALFUNCTIONS OR  
FAILURES OF ELECTRONIC MONITORING OR CONTROL DEVICES, TRANSIENT FAILURES OF ELECTRONIC  
SYSTEMS (HARDWARE AND/OR SOFTWARE), UNANTICIPATED USES OR MISUSES, OR ERRORS ON THE PART OF  
THE USER OR APPLICATIONS DESIGNER (ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER  
COLLECTIVELY TERMED SYSTEM FAILURES). ANY APPLICATION WHERE A SYSTEM FAILURE WOULD  
CREATE A RISK OF HARM TO PROPERTY OR PERSONS (INCLUDING THE RISK OF BODILY INJURY AND DEATH)  
SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM  
FAILURE. TO AVOID DAMAGE, INJURY, OR DEATH, THE USER OR APPLICATION DESIGNER MUST TAKE  
REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES, INCLUDING BUT NOT LIMITED TO  
BACK-UP OR SHUT DOWN MECHANISMS. BECAUSE EACH END-USER SYSTEM IS CUSTOMIZED AND DIFFERS  
FROM NATIONAL INSTRUMENTS' TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER  
MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT  
EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS, THE USER OR APPLICATION DESIGNER IS  
ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE SUITABILITY OF NATIONAL  
INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A  
SYSTEM OR APPLICATION, INCLUDING, WITHOUT LIMITATION, THE APPROPRIATE DESIGN, PROCESS AND  
SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION.  
 
Compliance  
FCC/Canada Radio Frequency Interference Compliance*  
Determining FCC Class  
The Federal Communications Commission (FCC) has rules to protect wireless communications from interference.  
The FCC places digital electronics into two classes. These classes are known as Class A (for use in industrial-  
commercial locations only) or Class B (for use in residential or commercial locations). Depending on where it is  
operated, this product could be subject to restrictions in the FCC rules. (In Canada, the Department of  
Communications (DOC), of Industry Canada, regulates wireless interference in much the same way.)  
Digital electronics emit weak signals during normal operation that can affect radio, television, or other wireless  
products. By examining the product you purchased, you can determine the FCC Class and therefore which of the two  
FCC/DOC Warnings apply in the following sections. (Some products may not be labeled at all for FCC; if so, the  
reader should then assume these are Class A devices.)  
FCC Class A products only display a simple warning statement of one paragraph in length regarding interference and  
undesired operation. Most of our products are FCC Class A. The FCC rules have restrictions regarding the locations  
where FCC Class A products can be operated.  
FCC Class B products display either a FCC ID code, starting with the letters EXN,  
or the FCC Class B compliance mark that appears as shown here on the right.  
Consult the FCC web site http://www.fcc.gov for more information.  
FCC/DOC Warnings  
This equipment generates and uses radio frequency energy and, if not installed and used in strict accordance with the  
instructions in this manual and the CE Mark Declaration of Conformity**, may cause interference to radio and  
television reception. Classification requirements are the same for the Federal Communications Commission (FCC)  
and the Canadian Department of Communications (DOC).  
Changes or modifications not expressly approved by National Instruments could void the users authority to operate  
the equipment under the FCC Rules.  
Class A  
Federal Communications Commission  
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15  
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the  
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency  
energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to  
radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in  
which case the user will be required to correct the interference at his own expense.  
Canadian Department of Communications  
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.  
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du  
Canada.  
Class B  
Federal Communications Commission  
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15  
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a  
residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed  
and used in accordance with the instructions, may cause harmful interference to radio communications. However,  
there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful  
interference to radio or television reception, which can be determined by turning the equipment off and on, the user  
is encouraged to try to correct the interference by one or more of the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and receiver.  
 
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.  
Consult the dealer or an experienced radio/TV technician for help.  
Canadian Department of Communications  
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.  
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du  
Canada.  
European Union - Compliance to EEC Directives  
Readers in the EU/EEC/EEA must refer to the Manufacturer's Declaration of Conformity (DoC) for information**  
pertaining to the CE Mark compliance scheme. The Manufacturer includes a DoC for most every hardware product  
except for those bought for OEMs, if also available from an original manufacturer that also markets in the EU, or  
where compliance is not required as for electrically benign apparatus or cables.  
*
Certain exemptions may apply in the USA, see FCC Rules §15.103 Exempted devices, and §15.105(c).  
Also available in sections of CFR 47.  
** The CE Mark Declaration of Conformity will contain important supplementary information and instructions  
for the user or installer.  
 
Conventions  
The following conventions are used in this manual:  
<>  
Angle brackets that contain numbers separated by an ellipsis represent a  
range of values associated with a bit or signal namefor example,  
DBIO<3..0>.  
This icon denotes a note, which alerts you to important information.  
This icon denotes a caution, which advises you of precautions to take to  
avoid injury, data loss, or a system crash.  
This icon denotes a warning, which advises you of precautions to take to  
avoid being electrically shocked.  
italic  
Italic text denotes variables, emphasis, a cross reference, or an introduction  
to a key concept. This font also denotes text that is a placeholder for a word  
or value that you must supply.  
monospace  
Text in this font denotes text or characters that you should enter from the  
keyboard, sections of code, programming examples, and syntax examples.  
This font is also used for the proper names of disk drives, paths, directories,  
programs, subprograms, subroutines, device names, functions, operations,  
variables, filenames and extensions, and code excerpts.  
 
Chapter 1  
NI 2591 Front Connector.................................................................................1-4  
Software Choices ...........................................................................................................1-5  
National Instruments Application Software....................................................1-5  
Chapter 2  
PXI Triggers....................................................................................................2-7  
External Trigger Input.......................................................................2-7  
Modes................................................................................................2-8  
Initiating Scanning...........................................................................................2-8  
Multiboard Triggering.....................................................................................2-8  
Appendix A  
Specifications  
Appendix B  
Servicing Your Module  
© National Instruments Corporation  
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Contents  
Appendix C  
Appendix D  
Technical Support Resources  
Glossary  
Index  
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1
Routing Signals  
with Your NI 2590/2591  
This manual describes the electrical and mechanical characteristics of the  
NI 2590, a 1 × 4, 50 , 1.3 GHz multiplexer module, and the NI 2591,  
a 1 × 4, 50 , 4.0 GHz multiplexer module, for the PXI bus. It contains  
information concerning their installation and operation.  
About the NI 2590/2591  
This section summarizes the features and operation of the NI 2590/2591  
switch module; refer to Chapter 2, NI 2590/2591 Operation, for more  
complete details. In addition, refer to Appendix A, Specifications,  
for detailed specifications of the switch module.  
The NI 2590/2591 are general-purpose, 4-channel, high-bandwidth  
multiplexing switches.  
The NI 2590 uses single-pole double-throw high-bandwidth relays capable  
of switching signals from DC to 1.3 GHz. The characteristic impedance of  
the channels is 50 Ω. The maximum rated voltage of the switch is 24 VDC,  
and the maximum rated current is 1 ADC.  
The NI 2591 uses a self-contained relay module consisting of three  
high-bandwidth relays capable of switching signals from DC to 4 GHz. The  
characteristic impedance of the channels is 50 Ω. The maximum rated DC  
voltage of the module is 30 V. The maximum rated current is 0.33 A.  
Triggers  
Two triggers are used for handshaking between the NI 2590/2591 switches  
and other PXI instruments. The scanner advanced trigger indicates when  
the module has closed all the necessary switches for the next scan and the  
switches have settled, or debounced.  
© National Instruments Corporation  
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Chapter 1  
Routing Signals with Your NI 2590/2591  
The external trigger input trigger is generated by another instrument or by  
software and causes the NI 2590/2591 to advance to the next entry in the  
scan list. The triggers can be routed to any of the PXI TTL triggers or to the  
PXI star trigger.  
Refer to Chapter 2, NI 2590/2591 Operation, for more information on  
triggers.  
RF Switching Precautions  
The NI 2590/2591 is a reflective switch, meaning that any channels not  
switched to the common channel are unterminated, and any signal on an  
unterminated channel will be reflected to its source. For most low-power  
switching applications this is not a problem. However, operation with an  
unterminated output can damage some high-power RF sources. Consult  
your RF source documentation for more information about connecting to  
unterminated channels.  
Caution Always disconnect all signals from the front connectors and power down the  
PXI chassis before removing the NI 2590/2591 from the chassis. Observe electrostatic  
discharge handling precautions during and after removal of the module, or when  
connecting and disconnecting signals on the front panel.  
Warning Do not exceed the channel-to-ground voltage rating. Any connections that  
exceed the maximum voltage for the NI 2590/2591 can result in an electrical shock hazard  
and damage to the switch module and any or all of the modules connected to the PXI  
backplane. National Instruments is not liable for any damages or injuries resulting from  
exceeding maximum voltage ratings. Refer to Appendix A, Specifications, for information.  
Contact Protection  
Caution The contacts of the relay are rated for a life of 5 × 106 mechanical operations  
when operated with no signal or a very small signal present. At full rated power1 A at  
24 VDC for the NI 2590 and 0.33 A at 30 VDC for the NI 2591the life of the switch is  
downgraded to 100,000 operations. If your setup allows, it is always best to turn off the  
input signals connected to the switch module during the switching operation to avoid  
contact arcing within the switch. Switching large inductive loads can also cause contact  
arcing. In such instances, install a flyback diode or varistor across the inductance to protect  
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Chapter 1  
Routing Signals with Your NI 2590/2591  
Connecting Signals  
The front of the NI 2590 module has five push-onSMB connectors for  
signal connections. The NI 2591 has five SMA female connectors. The  
center connection, labeled COM, is connected in a through path to one of  
the other four connections depending on the software instructions sent to  
the switch.  
NI 2590 Front Connector  
The following diagram shows the NI 2590 front connector. Table 1-1  
describes the connector signals.  
2590  
1×4 1.3 GHz Mux  
CH0  
CH1  
COM  
CH2  
CH3  
Figure 1-1. NI 2590 Front Connector  
© National Instruments Corporation  
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Routing Signals with Your NI 2590/2591  
NI 2591 Front Connector  
The following diagram shows the NI 2591 front connector. Table 1-1  
describes the connector signals.  
2591  
4 4 GHz Mux  
1×  
0
1
C
O
M
2
3
Figure 1-2. NI 2591 Front Connector  
Table 1-1. Front Connector Signal Description  
Signal Name  
Type  
Description  
CH<0..3>  
Input/Output  
ChannelsWhere signals are connected to the switch  
module  
COM  
Input/Output  
CommonThe common for the respective channel  
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Chapter 1  
Routing Signals with Your NI 2590/2591  
Software Choices  
You have several options to choose from when programming your National  
Instruments switch module. You can use the NI-SWITCH driver software  
or National Instruments application software.  
NI-SWITCH Driver Software  
The NI-SWITCH instrument driver is an Interchangeable Virtual  
Instrument (IVI)-compliant instrument driver that is bundled with the  
module at no cost.  
NI-SWITCH features a set of operations and attributes that exercise all  
the functionality of the switching hardware, including configuration,  
opening/closing, and scanning. In addition, NI-SWITCHNI-SWITCH  
comes with an interactive soft front panel and online documentation.  
NI-SWITCH eliminates the need to understand complex register  
programming and interrupt handling in the Microsoft operating systems,  
and frees you to focus on creating your test system.  
National Instruments Application Software  
LabVIEW and LabWindows/CVI are innovative program development  
software packages for data acquisition and control applications. LabVIEW  
uses graphical programming, whereas LabWindows/CVI enhances  
traditional programming languages. Both packages include extensive  
libraries for data acquisition, instrument control, data analysis, and  
graphical data presentation. Using LabVIEW or LabWindows/CVI can  
significantly reduce the development time for your data acquisition and  
control application.  
LabVIEW features interactive graphics, a state-of-the-art user interface,  
and a powerful graphical programming language. The LabVIEW  
NI-SWITCH VI Library, a series of virtual instruments (VIs) for using  
LabVIEW with National Instruments switch hardware, is included with  
the NI-SWITCH driver.  
LabWindows/CVI features interactive graphics, a state-of-the-art user  
interface, and uses the ANSI standard C programming language. The  
LabWindows/CVI NI-SWITCH Library, a series of functions for using  
LabWindows/CVI with National Instruments switch hardware, is included  
with the NI-SWITCH driver.  
© National Instruments Corporation  
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Chapter 1  
Routing Signals with Your NI 2590/2591  
Third-Party Software  
The NI-SWITCH instrument driver also includes support files for  
Microsoft Visual C++ and Microsoft Visual Basic. See the NI-SWITCH  
Software Readme File for version support information.  
Cabling and Accessory Requirements  
National Instruments recommends the use of cables and accessories with  
50 characteristic impedance with the NI 2590/2591.  
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2
NI 2590/2591 Operation  
This chapter contains safety instructions and a functional overview of the  
NI 2590/2591 switch modules. It also explains the operation of each  
functional unit making up the switch module.  
Safety Instructions  
Cautions Do not operate damaged equipment. The safety protection features built into this  
instrument can become impaired if the instrument becomes damaged in any way. If the  
instrument is damaged, do not use it until service-trained personnel can check its safety.  
If necessary, return the instrument to National Instruments for service and repair to ensure  
Do not operate this instrument in a manner that contradicts the information specified in this  
document. Misuse of this instrument could result in a shock hazard.  
Do not substitute parts or modify equipment beyond what is described in Appendix B,  
Servicing Your Module. Because of the danger of introducing additional hazards, do not  
install unauthorized parts or modify the instrument. Return the instrument to National  
Instruments for service and repair to ensure that its safety is not compromised.  
Connections that exceed any of the maximum signal ratings on the NI 2590/2591 can  
create a shock or fire hazard or can damage any or all of the devices connected to the  
NI 2590/2591. National Instruments is not liable for any damages or injuries resulting  
from incorrect signal connections.  
Clean instrument and accessories by brushing off light dust with a soft, nonmetallic brush.  
Remove other contaminants with a stiff nonmetallic brush. The unit must be completely  
dry and free from contaminants before returning to service.  
© National Instruments Corporation  
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NI 2590/2591 User Manual  
 
       
Chapter 2  
NI 2590/2591 Operation  
Functional Overview  
The following block diagrams illustrate the key functional components of  
the NI 2590 and NI 2591 switch modules.  
The major components of the NI 2590/2591 are as follows:  
General-purpose high-frequency relays  
Switch control circuitry  
Random scanning  
PXIbus interface  
Triggers  
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Chapter 2  
NI 2590/2591 Operation  
Front Panel  
MUX23  
MUX01  
MUX0123  
Scan Memory  
PXI  
Interface  
Triggers  
Relay Control  
PXIbus Connector  
Figure 2-1. NI 2590 Module Block Diagram  
© National Instruments Corporation  
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Chapter 2  
NI 2590/2591 Operation  
Front Panel  
High–  
Frequency  
Relay  
4 GHz  
Relay Module  
Control  
Lines  
DECODER  
Scan Memory  
PXI  
Interface  
Triggers  
Relay Control  
PXI Bus Connector  
Figure 2-2. NI 2591 Module Block Diagram  
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Chapter 2  
NI 2590/2591 Operation  
Relay Operation  
NI 2590 Operation  
The NI 2590 has four channels, CH0 through CH3, any one of which can  
be connected to the single common channel (COM) by closing the  
appropriate relays.  
You can control the relays individually, or you can use higher-level  
commands to energize the correct relays to connect a channel (such as  
CH0) to COM. Only one channel can be connected to the common channel  
at any time, and it is not possible to connect one channel to another channel  
bypassing the common channel.  
The NI 2590 relays are single-side stable. When power is removed from the  
relay coil, the relay returns to its de-energized state. When all three relays  
are de-energized, the default connection is from CH0 to COM, as shown in  
Figure 2-1. To connect CH2 to COM, you energize MUX0123; to connect  
CH3 to COM, you energize MUX0123 and MUX23. You can specify the  
channel to connect to COM and let the NI-Switch driver energize the  
appropriate relays for you. Refer to the NI-SWITCH Software User Manual  
for further information.  
NI 2591 Operation  
The NI 2591 is very similar to the NI 2590 in some respects, but different  
in others. The NI 2591 has 4 channels, CH0 through CH3, any one of which  
can be connected to the single COM by closing the appropriate relays.  
The NI 2591 does not allow for control of the individual relays. You must  
use the high-level commands to connect the channels, such as CH2 to  
COM. Only one channel can be connected to the common channel at any  
time, and it is not possible to connect one channel to another channel,  
bypassing the common channel. The default (power off) connection of the  
NI 2591 is CH3 to COM. Refer to Figure 2-2 to see how the connections in  
the NI 2591 are made.  
© National Instruments Corporation  
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Chapter 2  
NI 2590/2591 Operation  
Switch Control Circuitry  
The switch control circuitry (SCC) is responsible for opening and closing  
relays on the NI 2590/2591. You can load commands for the SCC into scan  
memory using the driver software you received with your kit. Consult the  
online help or your software documentation for specific information on the  
appropriate commands. There are two reasons for storing the commands in  
memory before the SCC can process them:  
Both the operate and release times for the NI 2590/2591 are 15 ms.  
Using memory storage, the software can send multiple commands to  
the SCC without having to wait for a relay action to complete.  
The memory is used to store a scan list necessary for hardware  
random scanning.  
Random Scanning  
The NI 2590/2591 can perform random scanning. In random scanning,  
the switch module can open or close relays in any order.  
The scan list is downloaded to onboard memory. Commands in the scan  
list can perform the following actions:  
Open or close relays  
Wait for an external trigger  
Generate a scanner advanced trigger  
Generate a breakpoint interrupt  
You can use the driver software to configure the switch module for  
continuous or one-time scanning. In continuous scanning, the switch  
module cycles through the scan list until you disable scanning. For  
one-time scanning, the switch module runs through the scan list only once.  
You can also use software commands to clear the scan list or reset it to the  
beginning at any time.  
The onboard control logic for the NI 2590/2591 switch module gives you  
direct access to open and close the relays, and also the ability to download  
up to 1,024 random scanning instructions. The software included with the  
module automatically configures the NI 2590/2591 and downloads the scan  
list to hardware for you. The scan list itself downloads directly into the  
memory of the module to deliver the fastest scan possible with no controller  
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NI 2590/2591 Operation  
intervention. You can configure the switch module to process the scan list  
once or to continuously loop through the scan list.  
PXI Interface  
You can configure and control your NI 2590/2591 switch module through  
the PXI interface, taking advantage of PXI features. The NI 2590/2591  
uses the PXI TTL triggers to synchronize scanning with a measurement  
device such as the NI 5102 (PXI) 20 MS/s oscilloscope, or the NI 5411  
for PXI arbitrary waveform generator.  
PXI Triggers  
External Trigger Input  
The NI 2590/2591 can use an external trigger input to advance between  
scan setups in a scan list. Using the driver software, you can configure the  
switch module to route the external trigger from any of the PXI TTL trigger  
lines or the PXI star trigger. Alternatively, you can use a software  
command to trigger the switch module.  
All external trigger lines are compatible with TTL voltage levels and are  
edge sensitive. The minimum pulse width from the PXI TTL triggers and  
PXI star trigger is 70 ns.  
Scanner Advanced  
The NI 2590/2591 can generate a scanner advanced trigger to indicate  
when the switch module is set up and ready to take measurements. Using  
the driver software, you can configure the switch module to route the  
scanner advanced (SCANADV) trigger to any PXI TTL trigger line or to  
the PXI star trigger. You can configure the switch module to generate the  
SCANADV trigger when a relay has settled (or debounced).  
Because the NI 2590/2591 has open-collector drivers on the PXI TTL  
trigger lines, you can have multiple switch modules using the same trigger  
line in the multiboard SCANADV mode.  
© National Instruments Corporation  
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Chapter 2  
NI 2590/2591 Operation  
Modes  
SCANADV has two modes of operation. In its default mode, the  
SCANADV trigger asserts for 1 µs after the relay has debounced. You  
can also configure the switch module for handshaking mode, in which the  
SCANADV trigger goes high after a relay settles, and the SCANADV  
trigger goes low after the external trigger input asserts. You can use this  
handshaking mode for multiboard scanning.  
Note The NI 2590/2591 ignores external triggers when it is not in a wait-for-trigger state  
while scanning.  
Initiating Scanning  
When you use the NI 2590/2591 to initiate a scan, make sure the  
measurement device is armed (waiting for trigger) before enabling  
scanning on the switch module. Enabling scanning causes the first  
switch(es) in the scan list to close and generates a scanner advanced  
trigger after the relay switches have settled or debounced.  
When you use the measurement device to initiate a scan, make sure  
scanning is enabled on the NI 2590/2591 before the measurement device  
starts to take measurements. This ensures that the switch module has the  
correct signal routed and that the switch module is waiting for an external  
trigger from the measurement device.  
Always configure the triggers in a system before configuring the  
measurement device or the NI 2590/2591 for scanning. When triggers  
are configured, a state change or pulse could occur on the trigger line.  
This is also possible when you reset the switch module.  
Multiboard Triggering  
You can use multiple NI 2590/2591 switch modulesor multiple other  
National Instruments switch modules such as the NI 2503together in  
conjunction with an instrument such as a National Instruments  
oscilloscope/digitizer. In multiple switch-module systems, be sure to  
identify one switch module as the master switch module.  
All other switch modules for the system are identified as slave switch  
modules. The master switch module can route an external trigger from the  
front connector to a PXI backplane trigger. In addition, the master switch  
module can route the SCANADV trigger from the PXI backplane to either  
the front connector or another backplane trigger. This functionality makes  
NI 2590/2591 User Manual  
2-8  
ni.com  
 
     
Chapter 2  
NI 2590/2591 Operation  
it possible to wire external triggers from/to only one switch module in the  
system, which simplifies the wiring scheme.  
Note The NI 2590/2591 does not support triggers on the front panel connector. If the  
trigger signal is external to the chassis, you must use a different National Instruments  
switch module, such as the NI 2503, as the master switch module.  
For more information, refer to the NI-SWITCH Software User Manual.  
© National Instruments Corporation  
2-9  
NI 2590/2591 User Manual  
 
A
Specifications  
This appendix lists the specifications for the NI 2590/2591 switch module.  
These specifications are typical at 25 °C unless otherwise noted.  
NI 2590  
Input Characteristics  
Number of relays.................................... 3  
Common-mode voltage  
Channel to earth.............................. 24 VDC  
Maximum switching voltage  
AC................................................... 24 Vrms  
DC................................................... 24 VDC  
Maximum switching capacity per channel  
DC................................................... 1 A at 24 V  
AC................................................... 1 Arms at 24 V  
Maximum switching  
power per channel .................................. 24 W  
Contact on resistance (initial) ................ 100 mmax  
Contact material ..................................... Gold-clad silver  
RF Performance Characteristics  
Characteristic impedance (Z0)................ 50 Ω  
Insertion loss at:  
< 100 MHz...................................... < 0.4 dB  
< 500 MHz...................................... < 0.9 dB  
< 1.3 GHz........................................ < 1.5 dB  
© National Instruments Corporation  
A-1  
NI 2590/2591 User Manual  
 
     
Appendix A  
Specifications for NI 2590  
VSWR at:  
< 100 MHz.......................................< 1.15  
< 500 MHz.......................................< 1.35  
< 1.3 GHz ........................................< 1.5  
Isolation:  
< 500 MHz.......................................< 62 dB  
< 1.3 GHz ........................................< 50 dB  
Risetime..................................................< 300 ps  
Signal delay ............................................< 3 ns  
Maximum RF carry power  
at 900 MHz .............................................10 W  
Note Refer to the cautions and warning in the RF Switching Precautions and Contact  
Protection sections of Chapter 1, Routing Signals with Your NI 2590/2591, for important  
information about using your NI 2590/2591 with high-power signals.  
Dynamic Characteristics  
Relay operate time (at 20 °C)  
Typical.............................................15 ms  
Relay release time (at 20 °C)  
Typical.............................................15 ms  
Expected life  
Mechanical (no load).......................5 × 106 operations  
Electrical at maximum  
switching capacity ...........................105 operations  
Caution Exceeding the maximum switching capability will decrease the expected life  
of the NI 2590/2591.  
PXI Bus Interface  
Slave  
NI 2590/2591 User Manual  
A-2  
ni.com  
 
Appendix A  
Specifications for NI 2590  
PXI Trigger Bus  
Trigger lines ........................................... 8  
Star trigger.............................................. 1  
Power Requirement  
+5 VDC  
Minimum (all relays opened).......... 350 mA  
Maximum (all relays closed) .......... 0.6 A  
Physical  
Dimensions............................................. 10 by 16 by 4 cm  
(3.9 by 6.3 by 1.6 in.)  
Weight.................................................... 240 g (8.5 oz)  
I/O connector.......................................... 5 SMB female  
Environment  
Operating temperature ..........................0 to 50 °C  
Storage temperature..............................20 to 70 °C  
Relative humidity................................... 5 to 85% noncondensing  
Maximum altitude.................................. 2,000 m  
Certifications and Compliances  
CE Mark Compliance  
See the Declaration of Conformity sheet accompanying product.  
© National Instruments Corporation  
A-3  
NI 2590/2591 User Manual  
 
Appendix A  
Specifications for NI 2591  
NI 2591  
Input Characteristics  
Number of relays ....................................3  
Common-mode voltage  
Channel to earth...............................30 Vrms or DC  
Maximum switching voltage  
AC....................................................30 Vrms  
DC....................................................30 VDC  
Maximum switching capacity per channel  
DC....................................................30 VDC at 0.33 ADC  
AC....................................................30 Vrms at 0.33 Arms  
Maximum switching  
power per channel...................................10 W  
Contact on resistance (initial).................200 mmax  
Contact material......................................Gold  
RF Performance Characteristics  
Characteristic impedance (Z0) ................50 Ω  
Insertion loss at:  
< 2.5 GHz ........................................< 0.6 dB  
< 4 GHz ...........................................< 0.9 dB  
VSWR at:  
< 2.5 GHz ........................................< 1.3  
< 4 GHz ...........................................< 1.5  
Isolation:  
< 2.5 GHz ........................................< 60 dB  
< 4 GHz ...........................................< 55 dB  
Maximum RF carry power  
at 900 MHz .............................................10 W  
NI 2590/2591 User Manual  
A-4  
ni.com  
 
Appendix A  
Specifications for NI 2591  
Note Refer to the safety information in Chapter 2, NI 2590/2591 Operation, for important  
information about using your NI 2591 with high-power signals.  
Dynamic Characteristics  
Relay operate time (at 20 °C)  
Typical ............................................ 15 ms  
Relay release time (at 20 °C)  
Typical ............................................ 15 ms  
Expected life  
Mechanical (no load) ...................... 5 × 106 operations  
Electrical at maximum  
switching capacity........................... 105 operations  
Caution Exceeding the maximum switching capability will decrease the expected life of  
the NI 2591.  
Power Requirement  
+5 VDC  
Maximum (all relays closed) .......... 250 mW  
Physical  
Weight.................................................... 1.1 kg  
Dimensions............................................. 10 by 16 by 4 cm  
(3.9 by 6.3 by 1.6 in.)  
I/O connector.......................................... 5 SMA female per bank  
Environment  
Operating temperature ..........................0 to 50 °C  
Storage temperature..............................20 to 70 °C  
Relative humidity................................... 5 to 85% noncondensing  
© National Instruments Corporation  
A-5  
NI 2590/2591 User Manual  
 
Appendix A  
Specifications for NI 2591  
Electromagnetic compatibility  
(EMC) emissions.............................Refer to the document supplied  
with the chassis for compliance  
to relevant directives.  
EMI..................................................FCC Class A compliant  
Maximum altitude...................................2,000 m  
Certifications and Compliances  
CE Mark Compliance  
See the Declaration of Conformity sheet accompanying product.  
NI 2590/2591 User Manual  
A-6  
ni.com  
 
B
Servicing Your Module  
This appendix describes procedures for servicing your NI 2590/2591  
module.  
Replacing the NI 2590 Relay Module  
The NI 2590 is constructed so that the relay module can be replaced when  
the relays fail. The life of the relay is nominally 105 operations when  
switching the maximum rated load.  
You can order an RF 2590 replacement relay module for your NI 2590 from  
National Instruments. The replacement kit contains the fully assembled  
module.  
1
2
3
5
4
1
2
Header  
Relay Module  
3
4
Screws  
SMB Connectors  
5
Hex Nuts and Washers  
Figure B-1. NI 2590 Parts Locator Diagram  
© National Instruments Corporation  
B-1  
NI 2590/2591 User Manual  
 
       
Appendix B  
Servicing Your Module  
Follow these instructions to replace the failed module as shown in  
Figure B-1.  
1. Ground yourself with a grounding strap or a ground connected to  
your PXI chassis. Properly grounding yourself prevents damage to  
your PXI module from electrostatic discharge.  
2. Remove the two Phillips-head screws that fasten the NI 2590 relay  
module board to the module carrier.  
3. Remove the hex nuts and washers from the SMB connectors on the  
front panel.  
4. Gently disconnect the rear of the module from the header, then  
carefully remove the module.  
5. Install the replacement module and screws in reverse order, taking care  
not to damage the connector pins on the module.  
Replacing the NI 2591 Relay Module  
The NI 2591 is constructed so that the relay module can be replaced when  
the relays fail. The life of the relay is nominally 105 operations when  
switching the maximum rated load.  
You can order an RF 2591 replacement relay module for your NI 2591 from  
National Instruments. The replacement kit contains the fully assembled  
module.  
NI 2590/2591 User Manual  
B-2  
ni.com  
 
Appendix B  
Servicing Your Module  
3
2
1
1
Hex Nuts and Washers  
2
Relay Module  
3
Base Card  
Figure B-2. RF 2591 Replacement Relay Module  
Follow these instructions to replace the failed module as shown in  
Figure B-2.  
1. Ground yourself with a grounding strap or a ground connected to your  
PXI chassis. Properly grounding yourself prevents damage to your PXI  
module from electrostatic discharge.  
2. Remove the four Phillips-head screws and nuts that fasten the NI 2591  
relay module to the module carrier.  
3. Remove the hex nuts and washers from the SMA connectors on the  
front panel.  
4. Remove the PXI ejector handle screw that secures the front panel.  
5. Remove the module from the base card.  
6. Install the replacement module and screws in reverse order, taking care  
not to damage the connector pins on the module.  
© National Instruments Corporation  
B-3  
NI 2590/2591 User Manual  
 
 
C
Common Questions  
This appendix addresses common questions you may have while using  
your NI 2590/2591 switch module.  
What should I do if the software detects the module but the switches do  
not switch?  
Verify that the switches do not switch. Close your application program  
and then launch the soft front panel as described in the Set up and Test  
document you received with your kit. The soft front panel shows the state  
of each relay on the module. Try closing and opening the switches.  
Also be sure to check the return codes of the NI-Switch operation to ensure  
that there are no errors (negative value) or warnings (positive value). You  
can also use the NI-Spy utility to check for error codes.  
Finally, verify that your code is correct. For reference, see the examples  
described in the NI-SWITCH Software User Manual. The NI-Switch driver  
also ships with several examples in source code. Compare your algorithm  
to those in the examples.  
What should I do if scanning does not work?  
First, ensure that you have configured the switch module and the instrument  
to match trigger lines. The output trigger of the instrument should connect  
to the trigger input of the switch module. In addition, the scanner advanced  
trigger of the switch module should be connected to the input trigger of the  
instrument.  
If the switch module is used to initiate the scan, make sure the scope or arb  
is waiting for a trigger before enabling scanning on the switch module. This  
is the recommended method for hardware scanning.  
If the scope or arb is used to initiate the scan, enable scanning on the switch  
module before configuring the scope or arb to start taking measurements.  
Also be sure to check the return codes of the NI-Switch operation to ensure  
that there are no errors (negative value) or warnings (positive value). You  
can also use the NI-Spy utility to check for error codes.  
© National Instruments Corporation  
C-1  
NI 2590/2591 User Manual  
 
 
Appendix C  
Common Questions  
Finally, verify that your code is correct. For reference, see the examples  
described in the NI-SWITCH Software User Manual. The NI-Switch driver  
also ships with several examples in source code. Compare your algorithm  
to the ones in the examples.  
Do I need to program the switch module myself?  
The NI 2590/2591 comes with the NI-Switch driver software, which  
exports the full functionality of the module. NI-Switch handles the  
complex issues of direct memory access, interrupts, and operating  
system interfacing.  
NI 2590/2591 User Manual  
C-2  
ni.com  
 
D
Technical Support Resources  
Web Support  
National Instruments Web support is your first stop for help in solving  
installation, configuration, and application problems and questions. Online  
problem-solving and diagnostic resources include frequently asked  
questions, knowledge bases, product-specific troubleshooting wizards,  
manuals, drivers, software updates, and more. Web support is available  
through the Technical Support section of ni.com  
NI Developer Zone  
The NI Developer Zone at ni.com/zone is the essential resource for  
building measurement and automation systems. At the NI Developer Zone,  
you can easily access the latest example programs, system configurators,  
tutorials, technical news, as well as a community of developers ready to  
share their own techniques.  
Customer Education  
National Instruments provides a number of alternatives to satisfy your  
training needs, from self-paced tutorials, videos, and interactive CDs to  
instructor-led hands-on courses at locations around the world. Visit the  
Customer Education section of ni.com for online course schedules,  
syllabi, training centers, and class registration.  
System Integration  
If you have time constraints, limited in-house technical resources, or other  
dilemmas, you may prefer to employ consulting or system integration  
services. You can rely on the expertise available through our worldwide  
network of Alliance Program members. To find out more about our  
Alliance system integration solutions, visit the System Integration section  
of ni.com  
© National Instruments Corporation  
D-1  
NI 2590/2591 User Manual  
 
   
Appendix D  
Technical Support Resources  
Worldwide Support  
National Instruments has offices located around the world to help address  
your support needs. You can access our branch office Web sites from the  
Worldwide Offices section of ni.com. Branch office Web sites provide  
up-to-date contact information, support phone numbers, e-mail addresses,  
and current events.  
If you have searched the technical support resources on our Web site and  
still cannot find the answers you need, contact your local office or National  
Instruments corporate. Phone numbers for our worldwide offices are listed  
at the front of this manual.  
NI 2590/2591 User Manual  
D-2  
ni.com  
 
Glossary  
Prefix  
p-  
Meaning  
pico-  
Value  
1012  
109  
106  
103  
106  
n-  
nano-  
micro-  
milli-  
µ-  
m-  
M-  
G-  
mega-  
giga-  
109  
Numbers and Symbols  
°
degrees  
%
>
ohms  
percent  
greater than  
less than  
<
A
A
amperes  
AC  
ADC  
ANSI  
alternating current  
amperes direct current  
American National Standards Institute  
© National Instruments Corporation  
G-1  
NI 2590/2591 User Manual  
 
 
Glossary  
B
breakpoint  
a specified point in program code where the program pauses to perform  
some action; a breakpoint interrupt can be added to a scan list for  
debugging or other special needs.  
bus  
the group of conductors that interconnect individual circuitry in a computer.  
Typically, a bus is the expansion vehicle to which I/O or other devices are  
connected. Examples of PC buses are the ISA and PCI bus.  
C
C
Celsius  
channel  
pin or wire lead on the multiplexer to which you apply or from which you  
read the signal  
common  
a channel that is typically the output of a switch module  
contact bounce  
the intermittent switching that occurs when the movable metal parts of a  
relay make or break contact  
D
DC  
direct current  
debounced  
device  
indicates when the contact bounce has ended. See contact bounce.  
a plug-in module, board, or pad that can contain multiple channels and  
conversion devices. Some examples of devices are computers,  
multimeters, multiplexers, oscillators, operator interfaces, and  
counters.  
diode  
an electronic component that acts primarily as a one-way valve  
drivers/driver software  
software that controls a specific hardware device such as a switch module  
E
external trigger  
a voltage pulse from an external source that triggers an event such as  
A/D conversion  
NI 2590/2591 User Manual  
G-2  
ni.com  
 
Glossary  
F
flyback voltage  
the voltage spike generated the instant current stops flowing through an  
inductor  
H
handshaking  
the use of two trigger lines between two instruments, such as a switch and  
a DMM, to synchronize their actions  
Hz  
hertzthe number of scans read or updates written per second  
I
in.  
inches  
Interchangeable  
Virtual Instrument  
an advanced architecture for instrument drivers that includes features such  
as simulation and state caching  
I/O  
input/outputthe transfer of data to/from a computer system involving  
communications channels, operator interface devices, and/or data  
acquisition and control interfaces  
ISA  
IVI  
Industry Standard Architecture  
See Interchangeable Virtual Instrument.  
N
NI-Switch  
an IVI-based instrument driver that supports the National Instruments line  
of switch modules  
P
PXI  
PCI with extensions for instrumentation  
© National Instruments Corporation  
G-3  
NI 2590/2591 User Manual  
 
Glossary  
R
random scanning  
scanning the channels in a mux in any order  
reflective switch  
a switch architecture in which the unused channels are NOT terminated in  
the characteristic impedance of the system. The unused channels are open  
circuits.  
relay  
rms  
a switch that connects or disconnects the signal to a common through the  
physical movement of a metal arm  
root mean squarethe square root of the average value of the square of the  
instantaneous signal amplitude; a measure of signal amplitude  
S
s
seconds  
scan  
the data acquisition of signals connected to multiple channels of a  
multiplexer. Typically, the measurement device uses a trigger to advance  
the multiplexer to the next channel in the scan.  
scan list  
a list of channels supplied to NI-Switch that indicates the order in which  
channels will be scanned  
scanner advanced  
trigger  
the trigger generated by the switch module when scanning. The trigger  
occurs after the switch module has closed a switch and the switch has  
settled.  
SCC  
switch control circuitry  
SMB  
sub-miniature snap-on connector  
soft front panel  
a graphical program included with NI-Switch that you can use to  
interactively control the switch  
T
trigger  
any event that causes or starts some form of data capture  
Transistor-Transistor Logic  
TTL  
NI 2590/2591 User Manual  
G-4  
ni.com  
 
Glossary  
V
V
volts  
varistor  
VDC  
VI  
an electrical resistor whose resistance depends on the applied voltage  
volts, direct current  
virtual instrument(1) a combination of hardware and/or software  
elements, typically used with a PC, that has the functionality of a classic  
stand-alone instrument (2) a LabVIEW software module (VI), which  
consists of a front panel user interface and a block diagram program  
VSWR  
Voltage Standing Wave Ratio. The impedance match of the device to the  
overall system.  
W
W
watts  
wire  
data path between nodes  
© National Instruments Corporation  
G-5  
NI 2590/2591 User Manual  
 
Index  
B
E
block diagrams  
NI 2590, 2-3  
NI 2591, 2-4  
environment specifications  
NI 2590, A-3  
NI 2591, A-5 to A-6  
external trigger input, 1-2, 2-7  
C
F
cables and accessories, 1-6  
certification and compliances  
NI 2590, A-3  
front connector  
NI 2590 front connector (figure), 1-3  
NI 2591 front connector (figure), 1-4  
signal descriptions (table), 1-4  
NI 2591, A-6  
CH<0..3> signal (table), 1-4  
COM signal (table), 1-4  
common questions about NI 2590/2591,  
C-1 to C-2  
I
input characteristics  
NI 2590, A-1  
connectors  
front connector  
NI 2591, A-4  
NI 2590 (figure), 1-3  
NI 2591 (figure), 1-4  
overview, 1-3  
signal descriptions for front connectors  
(table), 1-4  
L
LabVIEW and LabWindows/CVI software, 1-5  
contact protection, 1-2  
conventions used in manual, vi  
customer education, D-1  
M
maintaining the NI 2590. See servicing the  
NI 2590/2591.  
multiboard triggering, 2-8 to 2-9  
D
debouncing of switches, 1-1  
dynamic characteristics  
NI 2590, A-2  
N
National Instruments application software, 1-5  
NI 2590/2591 switch module. See also operation  
of NI 2590/2591.  
NI 2591, A-5  
block diagrams, 2-3 to 2-4  
cabling and accessories, 1-6  
common questions, C-1 to C-2  
connecting signals, 1-3  
© National Instruments Corporation  
I-1  
NI 2590/2591 User Manual  
 
 
Index  
contact protection, 1-2  
front connectors (figures), 1-3 to 1-4  
overview, 1-1  
physical specifications  
NI 2590, A-3  
NI 2591, A-5  
parts locator diagram  
NI 2590, B-1  
power requirement specifications  
NI 2590, A-3  
NI 2591, B-3  
NI 2591, A-5  
replacing relay module  
NI 2590, B-1 to B-2  
NI 2591, B-2 to B-3  
RF switching precautions, 1-2  
servicing, B-1 to B-3  
software choices, 1-5 to 1-6  
triggers, 1-1 to 1-2  
programming. See NI-Switch instrument  
driver; software choices.  
PXI interface, 2-7 to 2-9  
bus interface specifications, A-2  
initiating scanning, 2-8  
multiboard triggering, 2-8 to 2-9  
PXI triggers, 2-7 to 2-8  
external trigger input, 1-2, 2-7  
modes of operation, 2-8  
overview, 1-1  
NI Developer Zone, D-1  
NI-Switch instrument driver, 1-5, C-2  
scanner advanced, 1-1, 2-7  
trigger bus specifications, A-3  
O
operation of NI 2590/2591, 2-1 to 2-9  
block diagrams  
Q
NI 2590, 2-3  
NI 2591, 2-4  
questions about NI 2590/2591, C-1 to C-2  
functional overview, 2-2  
PXI interface, 2-7 to 2-9  
initiating scanning, 2-8  
multiboard triggering, 2-8 to 2-9  
PXI triggers, 2-7 to 2-8  
random scanning, 2-6 to 2-7  
relay operation  
NI 2590, 2-5  
NI 2591, 2-5  
safety instructions, 2-1  
switch control circuitry, 2-6  
R
random scanning, 2-6 to 2-7  
reflective switch, 1-2  
relay module, replacing  
NI 2590, B-1 to B-2  
NI 2591, B-2 to B-3  
relay operation  
NI 2590, 2-5  
NI 2591, 2-5  
RF performance characteristics  
NI 2590, A-1 to A-2  
NI 2591, A-4 to A-5  
RF switching precautions, 1-2  
P
parts locator diagram  
NI 2590, B-1  
NI 2591, B-3  
NI 2590/2591 User Manual  
I-2  
ni.com  
 
Index  
input characteristics  
NI 2590, A-1  
NI 2591, A-4  
physical  
NI 2590, A-3  
NI 2591, A-5  
power requirement  
NI 2590, A-3  
S
safety instructions, 2-1  
scanner advanced trigger  
modes of operation, 2-8  
overview, 1-1  
purpose and use, 2-7  
scanning  
common questions, C-1 to C-2  
initiating, 2-8  
NI 2591, A-5  
PXI bus interface, A-2  
PXI trigger bus, A-3  
RF performance characteristics  
NI 2590, A-1 to A-2  
NI 2591, A-4 to A-5  
switch control circuitry, 2-6  
switches do not switch, C-1  
system integration, by National  
Instruments, D-1  
random scanning, 2-6 to 2-7  
servicing the NI 2590/2591, B-1 to B-3  
parts locator diagram  
NI 2590, B-1  
NI 2591, B-3  
replacing relay module  
NI 2590, B-1 to B-2  
NI 2591, B-2 to B-3  
signal descriptions for front connector  
(table), 1-4  
software choices, 1-5 to 1-6  
National Instruments application  
software, 1-5  
NI-Switch instrument driver, 1-5  
third-party software, 1-6  
specifications, A-1 to A-6  
certification and compliances  
NI 2590, A-3  
T
technical support resources, D-1 to D-2  
third-party software, 1-6  
triggering, multiboard, 2-8 to 2-9  
triggers. See PXI triggers.  
W
NI 2591, A-6  
dynamic characteristics  
NI 2590, A-2  
Web support from National Instruments, D-1  
Worldwide technical support, D-2  
NI 2591, A-5  
environment  
NI 2590, A-3  
NI 2591, A-5 to A-6  
© National Instruments Corporation  
I-3  
NI 2590/2591 User Manual  
 

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