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USER GUIDE
BNC-2121 Connector Accessory
for 660X Devices
What You Need to Get Started
The BNC-2121 connector accessory is a terminal block that connects
signals to a 660X counter device and can be used to test features of
a 660X device. Use this guide to install and connect signals to a BNC-2121
connector accessory for testing or for performing counter applications.
For specific information about using a 660X device, refer to the 660X User
Manual.
You need the following items to install and use the BNC-2121 connector
accessory.
❑
BNC-2121 connector accessory
❑
BNC-2121 Connector Accessory for 660X Devices User Guide
❑
660X device
❑
660X User Manual
❑
68-position cable, such as the SH68-68-D1 or R6868
❑
BNC cables
❑
Wire no larger than 24 AWG
❑
Wire strippers
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Table of Contents
Related Manuals for National Instruments BNC-2121
Summary of Contents for National Instruments BNC-2121
- Page 1 The BNC-2121 connector accessory is a terminal block that connects signals to a 660X counter device and can be used to test features of a 660X device. Use this guide to install and connect signals to a BNC-2121 connector accessory for testing or for performing counter applications.
- Page 2 Connecting the BNC-2121 to a 660X Device You can use a BNC-2121 with any installed 660X device. Connect one end of a 68-position cable to a 660X device and the other end to the I/O connector on the BNC-2121, as shown in Figure 1.
- Page 3 5 Frequency Output Spring 13 Digital Line LED State Indicator LED State Indicator 14 BNC Connectors for Terminal Counters 0 and 1 6 +5 V Output Spring Terminal Figure 2. BNC-2121 Front Panel © National Instruments Corporation BNC-2121 Connector Accessory for 660X Devices...
- Page 4 Overview of Connecting to the BNC-2121 The BNC-2121 has two main areas of connectivity: the PFI lines and the user-defined functions. The PFI lines include bidirectional spring terminals, PFI <0..39>, and bidirectional BNC connectors, PFI <32..39>. Both connection types provide access to the respective PFI lines on the 660X device. The digital I/O indicators reflect the state of the dedicated digital I/O P.<0..7>...
- Page 5 BNC-2121. Connect the other wire of the wire pair to the ground of the peripheral device and the other end to the ground (GND) spring terminal closest to the signal.
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Page 6: Testing User-Defined Functions
Trigger spring terminal. The digital trigger also can simulate a channel Z pulse for quadrature encoder functions. The lowpass filter on the BNC-2121 is designed to remove glitches on the trigger output. If you want to use unconditional trigger output to test the... - Page 7 LED is off, the channel is in the low state. Using the BNC-2121 to Perform Counter Applications This section explains how to connect signals to the BNC-2121 to test, demonstrate, and perform counter applications with a 660X device. To find the correct application to perform, refer to the 660X User Manual.
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Page 8: Single Period Measurement
The counter counts the rising edges on SOURCE while GATE is active. Release the Digital Trigger button to drive GATE into a low state. The counter value is latched for a software read. BNC-2121 Connector Accessory for 660X Devices ni.com... -
Page 9: Two-Signal Edge-Separation Measurement
Press the Digital Trigger button to generate a single pulse. One pulse is generated on OUT of the counter when the trigger is received. To see the signal, connect an oscilloscope or analog input device to OUT of the selected counter. © National Instruments Corporation BNC-2121 Connector Accessory for 660X Devices... -
Page 10: Retriggerable Single Pulse Generation
Press the Digital Trigger button to drive GATE into a high state. Release the Digital Trigger button to drive GATE into a low state. To see the signal, connect an oscilloscope or analog input device to OUT of the selected counter. BNC-2121 Connector Accessory for 660X Devices ni.com... -
Page 11: Buffered Semi-Period Measurement
To ensure valid measurement data, discard the first value because the counter may Note be armed between active edges. The counter is latched at each active GATE edge (rising or falling) and the counter resets to zero. © National Instruments Corporation BNC-2121 Connector Accessory for 660X Devices... -
Page 12: Buffered Pulse-Width Measurement
SOURCE of the selected counter. Connect a wire from the Trigger spring terminal to GATE of the selected counter. The counter increments on each active SOURCE edge and latches at each active GATE edge. BNC-2121 Connector Accessory for 660X Devices ni.com... -
Page 13: Miscellaneous Functions
Connect a wire from the Trigger spring terminal to the selected PFI line and use it to produce the start trigger. Note You can use this method for any counter application. © National Instruments Corporation BNC-2121 Connector Accessory for 660X Devices... -
Page 14: Specifications
Specifications This section lists the specifications of the BNC-2121. These specifications are typical at 25 °C unless otherwise noted. PFI <0..39> Spring terminals........40 positions, wire no larger than 24 AWG BNC connectors........8 for PFI <32..39> User-Defined Field connections ........6 BNC connectors Spring terminals........6 positions, wire no larger than... -
Page 15: Digital Input/Output
660X device, which provides 1 A Physical Dimensions..........27.2 by 11.2 by 5.21 cm (10.69 by 4.41 by 2.05 in.) I/O connector.......... 68-pin male SCSI-II type BNC connectors ........14 Spring terminal plugs ......72 © National Instruments Corporation BNC-2121 Connector Accessory for 660X Devices... -
Page 16: Electromagnetic Compatibility
Directive (EMC) ........89/336/EEC Note Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, click Declarations of Conformity Information at ni.com/hardref.nsf/ BNC-2121 Connector Accessory for 660X Devices ni.com... -
Page 17: Technical Support Resources
Technical Support Resources NI 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... - Page 18 *322640C-01* trademarks of National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on...