Important Information Warranty The SCXI-1161 is 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.
National Instruments Documentation ... xi Related Documentation... xii Customer Communication ... xii Chapter 1 Introduction About the SCXI-1161 ... 1-1 What You Need to Get Started ... 1-1 Software Programming Choices ... 1-2 National Instruments Application Software ... 1-2 NI-DAQ Driver Software ... 1-3 Register-Level Programming ...
This manual describes the electrical and mechanical aspects of the SCXI-1161 and contains information concerning its operation and programming. The SCXI-1161 is a member of the National Instruments Signal Conditioning eXtensions for Instrumentation (SCXI) Series modules for the National Instruments data acquisition plug-in boards.
SCXI-1161 User Manual Appendix C, Customer Communication, contains forms you can use to request help from National Instruments or to comment on our products. The Glossary contains an alphabetical list and description of terms used in this manual, including abbreviations, acronyms, metric prefixes, mnemonics, and symbols.
The Glossary lists abbreviations, acronyms, mnemonics, symbols, and terms. National Instruments Documentation The SCXI-1161 User Manual is one piece of the documentation set for your data acquisition (DAQ) and SCXI system. You could have any of several types of manuals, depending on the hardware and software in your system.
The following National Instruments manual contains detailed information for the register-level programmer: • This manual is available from National Instruments by request. Using NI-DAQ, LabView, or LabWindows/CVI is as easy as using the low-level programming described in the register-level programmer manual.
Chapter 1 Introduction Software Programming Choices There are several options to choose from when programming your National Instruments DAQ or SCXI hardware. You can use LabVIEW, LabWindows/CVI, ComponentWorks, VirtualBench, NI-DAQ, or register-level programming. National Instruments Application Software LabVIEW features interactive graphics, a state-of-the-art user interface, and a powerful graphical programming language.
An example of a low-level function is writing directly to registers on the DAQ device. NI-DAQ does not sacrifice the performance of National Instruments DAQ devices because it lets multiple devices operate at their peak performance.
Chapter 1 Introduction Register-Level Programming The final option for programming any National Instruments DAQ hardware is to write register-level software. Writing register-level programming software can be very time-consuming and inefficient, and is not recommended for most users. Even if you are an experienced register-level programmer, consider...
The manufacturer part number National Instruments uses for this header is as follows: • The mating connector for the SCXI-1161 rear signal connector is a 50-position polarized ribbon-socket connector with strain relief. National Instruments uses a polarized or keyed connector to prevent inadvertent upside-down connection to the SCXI-1161.
Chapter 1 Introduction Unpacking Your SCXI-1161 module is shipped in an antistatic package to prevent electrostatic damage to the module. Electrostatic discharge can damage several components on the module. To avoid such damage in handling the module, take the following precautions: •...
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Thumbscrew Arc Suppressor Pads Strain Relief Bar Strain Relief Tightening Screws Warning Label Screw Thumbscrew Terminals FRONT Product Name Assembly Number Rear Signal Connector SCXIbus Connector Grounding Screw Serial Number REAR...
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If the device is damaged, turn the device off and do not use until service-trained personnel can check its safety. If necessary, return the device to National Instruments for service and repair to ensure that its safety is not compromised.
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To connect the safety earth ground to the safety ground solder lug, run an earth ground wire in the cable from the signal source to the terminal block. National Instruments is NOT liable for any damages or injuries resulting from inadequate safety earth ground connections.
Jumper W2 carries the SCXIbus MISO line, after buffering, to the SERDATOUT signal on the rear signal connector. Jumpers W3, W4, and W5 select whether the SCXI-1161 is to be connected to a DIO-type board or to an MIO-type board. DIO-type boards are National Instruments boards that have only digital inputs and outputs.
It does not matter which of the SCXI-1161s that are cabled to the data acquisition board has the pullup connected. Set jumper W1 to position 3 on all of the other SCXI-1161 modules that are cabled to the data acquisition board. If too many pullup resistors are attached to the SERDATOUT line, the drivers cannot drive the line low.
SCXI-1161-DIO-type boards and MIO-type boards. All three jumpers have labels indicating the DIO and the MIO configurations. If you want to use the SCXI-1161 with a DIO-type board, place all three jumpers in the DIO position, the factory setting. If you want to use the SCXI-1161 with an MIO-type board, place all three jumpers in the MIO position.
SCXI chassis for specific instructions and warnings. 1. Turn off the computer that contains the data acquisition board or 2. Turn off the SCXI chassis. Do not insert the SCXI-1161 into a 3. After you have connected your signals to the screw terminals, insert 4.
Screw Terminal Connections The SCXI-1161 has 24 screw terminals for easy signal connection to the inputs. Each input consists of a common (COM) position, a normally closed (NC) position, and a normally open (NO) position. At power up and at reset, the SCXI-1161 COM positions on all the channels connect to the NC positions.
To determine where to place each arc suppressor, refer to Tables 3-1 and 3-2, which indicate the channel and suppressor pad assignments. SCXI-1161 User Manual Inductive Load Table 3-1. Arc Suppressor Placement, COM to NO COM to NO...
Rear Signal Connector Note: If you will use the SCXI-1161 with a National Instruments data acquisition board and cable assembly, you do not need to read the remainder of this chapter. If you will also use the SCXI-1180 feedthrough panel, the SCXI-1343 rear screw terminal adapter, or the SCXI-1351 one-slot cable extender with the SCXI-1161, read this section.
Chapter 3 Signal Connections Rear Signal Connector Signal Descriptions Table 3-3 shows the rear signal connector signal descriptions. 24 or 50 26 or 47 SCXI-1161 User Manual Table 3-3. Rear Signal Connector Signal Descriptions Signal Name DIG GND SERDATIN SERDATOUT...
PC-LPM-16/PnP board, and the Lab-LC board, respectively. When you configure the SCXI-1161 for a DIO-type board, the digital I/O signals of the SCXI-1161 match the digital I/O lines of the DIO-24 and DIO-96 boards. When you use the SCXI-1161 with an SCXI-1348 cable assembly, the SCXI-1161 signals match the digital lines of the DIO-32F board.
Chapter 3 Signal Connections Table 3-4 lists the pin equivalences. For more information, consult the installation guide of your cable. Table 3-4. SCXIbus to SCXI-1161 Rear Signal Connector to Data Acquisition Board Pin Equivalences SCXIbus SCXI-1161 Line Rear Signal Connector...
Theory of Operation This chapter contains a functional overview of the SCXI-1161 module and explains the operation of each functional unit making up the SCXI-1161. Functional Overview The block diagram in Figure 4-1 shows the key functional components of the SCXI-1161.
• • The SCXI-1161 module is dedicated to switching and controlling power signal sources. The theory of operation of each of the SCXI-1161 components is explained in the rest of this chapter. Digital Interface Figure 4-2 shows a diagram of the SCXI-1161 and SCXIbus digital interface circuitry.
The Data Register is a 2-byte serial-in, parallel-out shift register with relay drive capabilities. The Data Register controls the state of the SCXI-1161 relays. The complete descriptions of the register bits are given in the SCXI Register-Level Programmers Manual. At reset or at power up, the relays are set to the NC position.
However, each time a relay changes its state, the Data Register is rewritten to. Refer to the SCXI-1161 Register-Level Programmers Manual for further details.
Specifications This appendix lists the specifications for the SCXI-1161. These are typical at 25° C and 50% humidity unless otherwise stated. The operating temperature range is 0° to 50° C. Channel Rating Maximum switching capacity (resistive load) Switching current...8 A maximum per channel Channel on resistance ...175 m...
Customer Communication This appendix describes the comprehensive resources available to you in the Technical Support section of the National Instruments Web site and provides technical support telephone numbers for you to use if you have trouble connecting to our Web site or if you do not have internet access.
Web sites from If you have trouble connecting to our Web site, please contact your local National Instruments office or the source from which you purchased your National Instruments product(s) to obtain support. For telephone support in the United States, dial 512 795 8248. For...
National Instruments for technical support helps our applications engineers answer your questions more efficiently. If you are using any National Instruments hardware or software products related to this problem, include the configuration forms from their user manuals. Include additional pages if necessary.
Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. ™ Title: SCXI -1161 User Manual Edition Date: March 1999 Part Number: 320514C-01 Please comment on the completeness, clarity, and organization of the manual.
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