BNC-2121 Connector Accessory for 660X Devices User Guide
Contents
1. sss Quadrature Encoder Spring terminals sees Channel A Channel B output channels eeseesss Puls swidth i idet R solution nette e Digital Trigger Number of signals sse Spring terminals sees Lowpass filter esee Function Generator Square wave Frequency range see Rise time eee ether ete BNC 2121 Connector Accessory for 660X Devices 14 40 positions wire no larger than 24 AWG 8 for PFI lt 32 39 gt 6 BNC connectors 6 positions wire no larger than 24 AWG Channel A leads Channel B when the encoder knob is turned 90 clockwise l us 24 pulses per revolution 1 TRG signal for triggering 1 position f 15 Hz TTL compatible 10 Hz 1 MHz 10 deviation over entire frequency range 250 ns ni com Fall time etes 50 ns Spring terminal 1 position Output voltage eeeeeee Refer to Figure 3 Square Wave Vpeak to peak Volts wo 1 0 1 MHz 10 kHz 5 kHz 2 kHz 1 kHz 680 Hz Hz Figure 3 Typical Maximum Voltages versus Load Impedances Digital Input Output LED state indicators 8 1 per digital line on PFI lt 0 7 gt Power Requirement 3 VIDC EJ iiic cereo cies cen 200 mA sourced from 662. 1 Connect a wire from the spring terminal to SOURCE of the selected counter Connect a wire from the Trigger spring terminal to GATE of the selected counter Press and hold the Digital Trigger button to drive GATE into a high state The counter counts the pulses on SOURCE as long as GATE is high Release the Digital Trigger button to drive GATE into a low state The counting halts and retains its value until you press the Digital Trigger button again and counting continues Single Period Measurement To take a single period measurement complete the following steps 1 In the C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter Connect a wire from the spring terminal to GATE of the selected counter The counter counts the rising edges on SOURCE between two active GATE edges The period is this count multiplied by the period of SOURCE Single Pulse Width Measurement To take a single pulse width measurement complete the following steps 1 In the C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter Connect a wire from the Trigger spring terminal to GATE of the selected counter Press the Digital Trigger button to drive GATE into a high state 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
3. 660X User Manual BNC 2121 Connector Accessory for 660X Devices 2 ni com A L3 8 Eig j wr NATIONAL PFI LINES 0 39 gt INSTRUMENTS BNC 2121 PwRO d 3 Ip rc op ja Ope Ti DIGITAL VO INDICATORS BL jjo j Jolie 15 Poo Pot eno O O Ja O ano Leja oj jo Opes TE P0 2 P0 3 sees o oj jo O mz i O O ono o oj jo O s P04 POS s ovr a Oj a O uev 5 O O R oj jo ofa P0 6 PO7 ev g ol lo O eo O O fap ovs ja ol la wane sso Holle loss PFI LINES 32 39 lo ffol ja o ee flours ja of lo O vens Beej ffol ja o se a o e Hofa OUTI UP DN1 PH Pra Pet E sour ja o O veros sel fe oja eno O o O ano sm lo oja Bes lo O ss eno O Oo Of ano ammo jlo O uere aeo ffo olse eno O o O ano amm o ofr aew o ofsa Oe eno O o O eno acm jo O eave sem jjo O ses RESERVE J Oo O nesenvez e GATEO SRCO Pris LES USER DEFINED FUNCTIONS ecooen usen excooene user2 p gt rricceR users IL users m users Quadrature Encoder 24 Pul
4. Measurement To perform buffered semi period measurement complete the following steps 1 Inthe C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Connect a wire from the spring terminal to GATE of the selected counter Each time GATE goes high the value of the counter is latched to a buffer Because buffered semi period measurement measures each phase of the pulse train you can detect changes in duty cycle hy Note To ensure valid measurement data discard the first value because the counter may 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 11 BNC 2121 Connector Accessory for 660X Devices Buffered Pulse Width Measurement To perform buffered pulse width measurement complete the following steps 1 Inthe C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Connect a wire from the spring terminal to GATE of the selected counter Each time GATE goes high the value of the counter is latched to a buffer 3 Note For buffered pulse width measurement the counter value obtained between the rising and falling edges of GATE is latched at the completion of each pulse width interval of GATE Buffered Two Signal Edge Separation Measurement To perform a buffered two signal edge separation measurement compl
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6. connections include the following e Six output spring terminals Encoder A Encoder B Trigger Square Wave m 5 V and GND e Controls for the outputs listed above Quadrature Encoder Digital Trigger Frequency Selection and Frequency Adjust Table lists the controls and the outputs associated with them Table 1 User Defined Function Controls and the Corresponding Outputs Controls Spring Terminal Outputs Quadrature Encoder Knob Encoder A Quadrature Encoder Knob Encoder B Digital Trigger Button Trigger Frequency Selection Ju Frequency Adjust e Six bidirectional user defined spring terminals USER lt 1 6 gt e Six user defined BNC connectors USER lt 1 6 gt hy Note The user defined spring terminals are internally mapped one to one to corresponding BNC connectors For example the USER 1 spring terminal is internally wired to the USER 1 BNC connector When you want BNC connections for counters other than 0 or 1 use the user defined connections BNC 2121 Connector Accessory for 660X Devices 4 ni com Connecting to the Spring Terminals Use the BNC 2121 connector accessory to access the PFI lines on a 660X device To make the connection complete the following steps 1 Using wire strippers strip the wire insulation no more than 7 mm 2 Connect a wire to a spring terminal on the BNC 2121 by depressing the orange tab and inserting the stripped end o
7. read BNC 2121 Connector Accessory for 660X Devices 8 ni com Two Signal Edge Separation Measurement To take a two signal edge separation measurement complete the following steps 1 Connect a wire from the spring terminal to UP DOWN of the selected counter 2 Inthe C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter As soon as UP DOWN goes active the counter counts the edges on SOURCE 3 Connect a wire from the Trigger spring terminal to GATE of the selected counter 4 Press the Digital Trigger button to drive GATE into an active state As soon as GATE goes active the counter value is latched for a software read ER Note UP DOWN and AUX LINE share the same PFI line on all counters Single Pulse Generation To generate a single pulse complete the following steps 1 In the C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter Specify the pulse delay and pulse width in the C interface or LabVIEW To see the signal connect an oscilloscope or analog input device to OUT of the selected counter Single Triggered Pulse Generation To generate a single triggered pulse complete the following steps 1 National Instruments Corporation In the C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter Specify the pulse delay and pulse width in the C interface or LabVIEW Connect a wire fr
8. spring terminal 2 Use the Frequency Selection switch to select a frequency range of 10 Hz 200 Hz 150 Hz 20 kHz or 14 kHz 1 MHz 3 Adjust the frequency within the range you selected by turning the Frequency Adjust knob Viewing the State of the DIO Lines The eight Digital I O indicators indicate the state of PFI lt 0 7 gt on a 660X device When the LED is lit the channel is in the high state When the 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 Counter program examples mentioned in this section are in the following locations e NI DAQ Measurement Studio CVI Samples DAQ Ctr e LabVIEW Program Files National Instruments LabVIEW Examples DAQ Counter NI TIO 11b National Instruments Corporation 7 BNC 2121 Connector Accessory for 660X Devices Simple Event Counting To perform simple event counting connect a wire from the spring terminal to SOURCE of the selected counter The 660X device counts the number of pulses that occur on SOURCE Alternatively you can connect a wire from the Trigger spring terminal to provide pulses on SOURCE Gated Event Counting To perform gated event counting complete the following steps
9. the spring terminal to SOURCE of counter 0 which is PFI 39 The counter counts the number of edges received during the interval defined by OUT of counter 1 The frequency measured is the number of counts divided by the duration of GATE in seconds Another counter pair also can be similarly used Simultaneously Starting Counters You can configure two or more counters to arm from the same start trigger using a software or hardware command To simultaneously arm two or more counters to perform single pulse generation complete the following steps 1 Configure two or more counters to generate a pulse after receiving a start trigger In software select a PFI line such as PFI 0 to receive the start trigger 2 To see the pulse on the outputs connect an oscilloscope or analog input device to OUT of the selected counters 3 Connect a wire from the Trigger spring terminal to the selected PFI line and use it to produce the start trigger hy Note You can use this method for any counter application National Instruments Corporation 13 BNC 2121 Connector Accessory for 660X Devices Specifications This section lists the specifications of the BNC 2121 These specifications are typical at 25 C unless otherwise noted PFI lt 0 39 gt Spring terminals esses BNC connectors sseeeeeeeeennne User Defined Field connections esee Spring terminals
10. 0X device which provides 1 A Power available at 5 V spring terminal 3596 600 mA sourced from 660X device which provides 1 A Physical Dimensions erret re renes 27 2 by 11 2 by 5 21 cm 10 69 by 4 41 by 2 05 in VO connector eene 68 pin male SCSI II type BNC connectors seeseese 14 Spring terminal plugs 72 National Instruments Corporation 15 BNC 2121 Connector Accessory for 660X Devices Environment Safety Operating temperature esses 0 to 50 C Storage temperature esses 20 to 70 C Relative humidity 10 to 9096 noncondensing This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use e TEC 61010 1 EN 61010 1 e UL3111 1 UL 61010B 1 e CAN CSA C222 No 1010 1 hy Note For UL and other safety certifications refer to the product label or to ni com Electromagnetic Compatibility CE C Tick and FCC Part 15 Class A Compliant Emissions eeeeeeeeeennennnnn EN 55011 Class A at 10 m FCC Part 15A above 1 GHz rmpiinity 5 uere ette etre teen EN 61326 1997 A2 2001 Table 1 Sy Note For EMC compliance you must operate this device with shielded cabling CE Compliance This product meets the essential requirements of applicable European
11. A USER GUIDE BNC 2121 Connector Accessory for 660X Devices 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 What You Need to Get Started 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 D D OC D ODO Wire strippers Qr NATIONAL p INSTRUMENTS 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 Figure 1 Connecting a BNC 2121 to a 660X Device nye Note If the power LED indicator does not light up check the cable connections to make sure the cable is connected securely Connecting Signals to the BNC 2121 Connect signals using the spring terminals or BNC connectors shown in Figure 2 For pinout diagrams and more specific information about connecting signals refer to the
12. BNC 2121 is designed to remove glitches on the trigger output If you want to use unconditional trigger output to test the debouncing filter on a 660X device flip the Filtering switch to the OFF position connect the trigger output to a PFI line and programmatically enable the debouncing filter on the 660X device For all other applications flip the Filtering switch to the ON position Measuring Position The BNC 2121 can produce 24 pulses per encoder revolution You can test this feature using the following programs e Cinterface TIOquadEncoderPosMeasure c located in Program Files National Instruments Measurement Studio CVI Samples DAQ Ctr LabVIEW Measure Position VI located in Program Files National Instruments LabVIEW Examples DAQ Counter NI TIO 11b BNC 2121 Connector Accessory for 660X Devices 6 ni com To measure position using counter 0 of a 660X device make the following connections 1 Connect a wire from channel A to SOURCE of counter 0 default PFI 39 2 Connect a wire from channel B to UP DOWN of counter 0 default PFI 37 3 Note Ifyou want to simulate a Z channel connect a wire from the Trigger spring terminal to GATE of counter 0 default PFI 38 Creating a Square Wave The BNC 2121 has a function generator that produces TTL compatible square waveforms To create a square wave complete the following steps 1 Access the square wave output by connecting signals to the
13. Directives as amended for CE Marking as follows Low Voltage Directive safety 73 23 EEC Electromagnetic Compatibility Directive EMC esee 89 336 EEC hy 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 16 ni com 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 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 email 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 For telephone support in the
14. ete the following steps 1 Inthe C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Connect a wire from the spring terminal to UP DOWN of the selected counter 3 Connect a wire from the Trigger spring terminal to GATE of the selected counter The counter counts the rising edges on SOURCE between the active edge of UP DOWN and the active edge of GATE The counter value latches at each active edge of GATE 4 Pressthe Digital Trigger button to drive GATE into a high state Press the Digital Trigger button several times to obtain multiple GATE edges Buffered Periodic Event Counting To perform buffered periodic event counting complete the following steps 1 Connect a wire from the spring terminal to SOURCE of the selected counter 2 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 12 ni com Miscellaneous Functions Use these functions with any of the counter applications described in this document Measuring Frequency To measure a frequency using counter pair 0 and 1 complete the following steps l In the C interface or in LabVIEW select GATE as the output of the other counter This selection allows OUT of counter 1 to be the GATE signal for counter 0 2 Connecta wire from
15. f the wire fully into the terminal Tip For the best performance use twisted pair wire Connect one wire of the wire pair from the signal on the peripheral device and the other end of the same twisted wire to the signal on the 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 UN Caution Make sure that no bare wire extends past the spring terminal Exposed wire increases the risk of a short circuit or a failure 3 Ifyou need to ground a signal a ground GND spring terminal is available between every two PFI lines For details about grounding a signal refer to the 660X User Manual The user defined functions area of the BNC 2121 has six user defined spring terminals USER lt 1 6 gt and six corresponding BNC connectors USER lt 1 6 gt Use these spring terminals for either input or output For example if you want to connect a BNC cable to GATE of a counter other than Counter 0 or 1 connect a wire from the GATE spring terminal on the 660X device to a user defined spring terminal USER 1 on the BNC 2121 and the signal is available through the corresponding BNC connector USER 1 The six other spring terminals ENCODER A ENCODER B TRIGGER 5 V and GND are used as signal outputs only Follow steps 1 and 2 in this section to connect the output wires to the appropriate spring terminals Use the corresponding contro
16. ls for each spring terminal given in Table 1 to regulate a signal Connecting to the BNC Connectors Use the eight BNC connectors to access PFI 32 39 on a 660X device Each line corresponds to SOURCE GATE OUT and UP DOWN of counter 0 or 1 National Instruments Corporation 5 BNC 2121 Connector Accessory for 660X Devices To make the connection complete the following steps 1 Insert one end of the BNC cable in one of the PFI lt 32 39 gt BNC connectors 2 Connect the other end of the BNC cable to the output device In addition to the BNC connectors associated with the PFI lines of the 660X device the BNC 2121 has six user defined BNC connectors USER lt 1 6 gt that are associated with six corresponding user defined spring terminals USER lt 1 6 gt You can use these BNC connectors for either input or output Testing User Defined Functions You can use the BNC 2121 to test the following features on the 660X device Producing a 5 V Pulse Use the digital trigger to test an application that counts or measures pulses Press the Digital Trigger button to produce a 5 V pulse for as long as the button is pressed causing the LED to light up When you release the button the trigger line goes low You can access the digital trigger by connecting a wire to the Trigger spring terminal The digital trigger also can simulate a channel Z pulse for quadrature encoder functions The lowpass filter on the
17. om the Trigger spring terminal to GATE of the selected counter 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 9 BNC 2121 Connector Accessory for 660X Devices Retriggerable Single Pulse Generation To generate a retriggerable single pulse complete the following steps 1 Inthe C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Specify the pulse delay and pulse width in the C interface or LabVIEW 3 Connect a wire from the Trigger spring terminal to GATE of the selected counter 4 Pressthe Digital Trigger button to generate a pulse Any time you want an additional pulse press the Digital Trigger button to generate a pulse on OUT of the counter ER Note A pulse is generated on every active GATE edge 5 To see the signal connect an oscilloscope or analog input device to OUT of the selected counter Continuous Pulse Train Generation To generate a continuous pulse train complete the following steps l Inthe C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Inthe C interface or in LabVIEW specify the frequency and duty cycle of the pulse train 3 To see the signal connect an oscilloscope or analog input device to OUT of the selected counter F
18. r respective companies For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD orni com patents 2001 2003 National Instruments Corp All rights reserved LLLI 322640C 01 Jun03
19. requency Shift Keying To perform frequency shift keying complete the following steps l Inthe C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Connect a wire from the Trigger spring terminal to GATE of the selected counter 3 Press the Digital Trigger button to drive GATE into a high state 4 Release the Digital Trigger button to drive GATE into a low state 5 To see the signal connect an oscilloscope or analog input device to OUT of the selected counter BNC 2121 Connector Accessory for 660X Devices 10 ni com Buffered Event Counting To perform buffered event counting complete the following steps 1 Inthe C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Connect a wire from the spring terminal to GATE of the selected counter Each time GATE goes high the value of the counter is latched to a buffer Buffered Period Measurement To perform buffered period measurement complete the following steps 1 Inthe C interface or in LabVIEW select an internal timebase as SOURCE of the selected counter 2 Connect a wire from the spring terminal to GATE of the selected counter 3 Note To ensure valid measurement data discard the first value because the counter may be armed between active edges The counter is latched at each active GATE edge rising or falling and the counter resets to zero Buffered Semi Period
20. ses rev A B gt C Q 14 kHz 1 MHz f N Digital Trigger TRIGGEI 150 Hz 20 kHz H J OFF ON 10 Hz 200 Hz X R Filtering pese o ror LE 6 5 V Output Spring Terminal 1 Warning Label 7 GND Terminal 15 User Defined BNC Connector 2 PFI Line Spring Terminal 8 Quadrature Encoder Knob 16 Spring Terminals for 3 Quadrature Encoder Output 9 Digital Trigger Button User Defined BNC Connectors Spring Terminals 10 Digital Trigger Filtering Switch 17 Frequency Selection Switch 4 Digital Trigger Output Spring 11 68 Position I O Connector 18 Frequency Adjust Knob Terminal 12 Power LED Indicator 19 Digital Trigger Line 5 Frequency Output Spring 13 Digital Line LED State Indicator LED State Indicator Terminal 14 BNC Connectors for Counters 0 and 1 National Instruments Corporation Figure 2 BNC 2121 Front Panel 3 BNC 2121 Connector Accessory for 660X Devices 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 lt 0 39 gt and bidirectional BNC connectors PFI lt 32 39 gt 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 lt 0 7 gt spring terminals The user defined function
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