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USB-2533 User's Guide - from Measurement Computing

1. J7 Table 21 40 pin header connector pin out J7 on the board Pin Function Pin Function 1 GND 2 XAPCR input scan clock 3 4 4 5 1 6 5 7 2 8 9 10 A7 11 GND 12 TTL TRG 13 BO 14 B4 15 B1 16 B5 17 B2 18 B6 19 B3 20 B7 21 GND 22 5 V see Note 7 23 Co 24 C4 25 C1 26 C5 27 C2 28 C6 29 C3 30 C7 31 GND 32 TMR1 33 TMRO 34 CNT1 35 CNTO 36 CNT3 37 CNT2 38 GND 39 GND 40 GND J8 Table 22 40 pin header connector pin out J8 on the board Pin Function Pin Function 1 13 V see Note 8 2 13 V see Note 8 3 NC 4 NC 5 AGND 6 AGND 7 NC 8 NC 9 NC 10 NC 11 AGND 12 AGND 13 SelfCal 14 SGND low level sense not for general use 15 AGND 16 AGND 17 TTL TRG 18 XDPCR output scan clock 19 XAPCR input scan clock 20 GND digital 21 GND digital 22 GND digital 23 NC 24 NC 25 5 V see Note 7 26 AUX PWR output reserved 27 NC 28 NC 29 NC 30 NC 31 32 NC 33 NC 34 NC 35 NC 36 NC 37 NC 38 NC 39 NC 40 NC Note 7 5 V output 20 tolerance 2mA USB powered 10mA using external power Note 8 13 V outputs 10 tolerance mA USB powered 5 mA using external power 59 Specifications USB 2533 User s Guide TC connector pin out TB7 TC CHO TC CH 1 TC CH2 TC CH 3 Figure 31 TC terminal pin out labeled TB7 60 Measurement Computing Corporation 10 Commerce Way Suite 10
2. Voltage range Accuracy Temperature coefficient Noise cts of reading 96 ppm of reading ppm range C RMS range 23 10 1 year 10 10 0 031 0 008 14 8 2 0 5 V to5 V 0 031 0 009 1449 3 0 2Vto2V 0 03196 0 01096 14 10 2 0 l1VtolV Note 1 0 031 0 02 14 12 3 5 Note 2 500 mV to 500 mV 0 031 0 04 14 18 5 5 200 mV to 200 mV 0 036 0 075 14 12 8 0 100 mV to 100 mV 0 042 0 15 14 18 14 0 Note 1 Specifications assume differential input single channel scan 1 MHz scan rate unfiltered CMV 0 0 30 minute warm up exclusive of noise range is FS to FS 50 USB 2533 User s Guide Specifications Note 2 Noise reflects 10 000 samples at 1 MHz typical differential short Thermocouples Table 3 TC types and accuracy Note 3 TC type Temperature range Accuracy Noise typical C J 200 to 760 1 7 0 2 K 200 to 1200 1 8 0 2 T 200 to 400 1 8 0 2 E 270 to 650 1 7 0 2 R 50 to 1768 4 8 1 5 S 50 to 1768 4 7 1 5 N 270 to 1300 2 7 0 3 B 300 to 1400 3 0 1 0 Note 3 Assumes 16384 oversampling applied CMV 0 0V 60 minute warm up still environment and 25 ambient temperature excludes thermocouple error 0 C for all types except 1000 PS 9V 1AEPS 2500 power supply for external power Digital input output Table 4 Digital input output
3. Hardware an log trig Perm ete e t tre i e teen eee e ede et re Digital Software based triggering Stop trigger modes Pre triggering and post triggering modes Counter etie poem el d 0858 2533 User s Guide Mapped channels Counter modes Debounce 100d6 5 RERO AIRE DP E P E 33 Encoder mode gn DURER RR nS eU S 36 Timer Outputs us ec e Re A e AR e e p i Aol Ava ua asia e do uo fessa 40 Example Timer Outputs P RO SER REN 40 Using detection setpoints for output control esee eene eene rennen ener 40 What are detection setpoints iie ederet E Yr ied Mee EU SE epe ote praedi bae ee er d 40 Setpoint config rati n OVeEVIEW o 41 Setpoint Config Uralionk e RE ee DR URP E OR I eb f CER eter neon 42 Using tlie s tpoint Status register eee P eR 43 Example s of control RE NE e e ah ee A E eS 43 Detection setpoint details FIRSTPORTC or timer update latency osi enie ere ea e s 46 Mechanical emen e RE a RU 48 Chapter 4 Calibrating the USB 2533 11 49 Chapter 5 SPOCITIC Atl OMS iis ee EP 50 Analoemnput
4. 14 USB 2533 User s Guide Installing the USB 2533 40 pin header connector pin outs Analog channels pin out J5 and J6 2 49 edge of the header is closest to the center of the USB Er 2533 Pins 2 and 40 are labeled on the board silkscreen 1 39 40 pin header connectors pin out labeled J5 and J6 64 channel single ended mode Analog channel Pin J5 Pin Analog channel Analog channel Pin J6 Pin Analog channel acH27 1 2 acho AcH3 2 achso ACH26 3 II 4 ACH18 ACH35 3 II 4 51 AcND 5 XC 6 5 AcHss ACH3 7 8 ACH 1 ACH42 7 II 8 50 ACH2 9 10 10 ACH34 9 10 57 17 11 II 12 25 AGND 11 II 12 ACH16 13 ESI 14 ACH24 ACH41 13 14 56 achi 15 Ey o 16 acho AcHss 15 16 Ace ACHO 17 18 ACH8 ACH40 17 18 AGND AGND 19 II 20 AGND ACH32 19 II 20 23 21 22 47 21 22 55 ACH22 23 II 24 ACH30 ACH39 23 II 24 AGND ACH7 25 ESI 26 15 ACH46 25 26 6 27 II 28 14 ACH38 27 II 28 54 AGND 29 II 30 ACH AGND 29 II 30 6 ACH29 31 32 20 ACH45 31 32 5 AcH2s aces AcHs 34 AcHi3 35 Eg AcH44 12 37 II 38 AGND ACH36 37 II 38 AGND AGND 39 ES 40 AGND AGND 39 40 AGND 15 USB 2533 User s Guide Installing the USB 2533 40 pin header conne
5. Configuring the hardware Connecting the board for I O operations Connectors cables main I O connector sess enne sene 68 pin SCSI connector differential and single ended pin outs P5 TB 100 terminal board connector to SCSI connector pin 40 pin be der connector pin outs csset ett UR UR e EUR OH e RUE REESE Four channel TC terminal pin out TB7 eeeesesssseeseeeeeeeeee nnne Cabling ud em aei eroe est i b edid o ba eeu Field wiring and signal termination Using multiple USB 25338 per PO neni Hee mdp nre ore ro Shira Eb eigo Chapter 3 Functional Deta ils 2 tere ez ccu ina da esa cece cu 21 U USB 2533 components 5 bi e era i D e a e dile ate eie 21 USB 2533 block diagrami e ac eU e ete e c na Se 23 Synchronous I O mixing analog digital and counter scanning esee 24 Analog input Analog input scanning Thermocouple inp t Tips for making accurate temperature measurements 27 Digital IO in etm beh to Ae e UR He teta Digital input scanning Digital outputs and pattern generation bU PI VD
6. When setting a detection window keep a scan period in mind This applies to analog inputs and counter inputs Quickly changing analog input voltages can step over a setpoint window if not sampled often enough There are three possible solutions for overcoming this problem Shorten the scan period to give more timing resolution on the counter values or analog values Widen the setpoint window by increasing limit A and or lowering limit B Acombination of both solutions 1 and 2 could be made 47 0898 2533 User s Guide Functional Details Mechanical drawing 4 906 440 3 519 91 786 275 427 R 060 TYP ae 3PLCS le i s 7 i i aK iF m re 275 LOH Teg 190 342 156 TYP 1 334 780 5 730 7 PLCS 5 9 i sal 15 EE 2 344 551 Je 1 736 p 623 e2 f 2 630 ao 40146 s ell fell d Y S NMooooooo amp 1 282 529 1 275 j pom f 400 _ LL 190 1 562 3 528 4 678 5 178 6 000 Figure 30 Circuit board dimensions 48 Chapter 4 Calibrating the USB
7. Example diagram of detection signals for channels 1 2 and 3 Each channel in the scan group can have one detection setpoint There can be no more than 16 total setpoints total applied to channels within a scan group Detection setpoints act on 16 bit data only Since the USB 2533 has 32 bit counters data is returned 16 bits at a time The lower word the higher word or both lower and higher words can be part of the scan group Each counter input channel can have one detection setpoint for the counter s lower 16 bit value and one detection setpoint for the counter s higher 16 bit value Setpoint configuration You program all setpoints as part of the pre acquisition setup similar to setting up an external trigger Since each setpoint acts on 16 bit data each has two 16 bit compare values a high limit Jimit and a low limit limit B These limits define the setpoint window There are several possible conditions criteria and effectively three update modes as explained in the following configuration summary Set high limit You can set the 16 bit high limit limit A when configuring the USB 2533 through software Set low limit You can set the 16 bit low limit limit B when configuring the USB 2533 through software Set criteria Inside window Signal is below 16 bit high limit and above 16 bit low limit Outside window Signal is above 16 bit high limit or below 16 bit low limit Greater than value Signal is above 16
8. Sampling digital inputs for every analog sample in a scan group on page 26 for more information In both modes adding digital input scans has no affect on the analog scan rate limitations If no analog inputs are being scanned the digital inputs can sustain rates up to 4 MHz Higher rates up to 12 MHz are possible depending on the platform and the amount of data being transferred Digital outputs and pattern generation Digital outputs can be updated asynchronously at anytime before during or after an acquisition You can use two of the 8 bit ports to generate a digital pattern at up to 4 MHz The USB 2533 supports digital pattern generation The digital pattern can be read from PC RAM 28 0858 2533 User s Guide Functional Details Higher rates up to 12 MHz are possible depending on the platform and the amount of data being transferred Digital pattern generation is clocked using an internal clock The on board programmable clock generates updates ranging from once every 1 second to 1 MHz independent of any acquisition rate Triggering Triggering can be the most critical aspect of a data acquisition application The USB 2533 supports the following trigger modes to accommodate certain measurement situations Hardware analog triggering The USB 2533 uses true analog triggering in which the trigger level you program sets an analog DAC which is then compared in hardware to the analog input level on the selected cha
9. USB cable 2 meter length Optional components Cables and signal conditioning accessories that are compatible with the USB 2533 are not included with USB 2533 orders and must be ordered separately If you ordered any of the following products with your board they should be included with your shipment USB 2533 User s Guide Installing the USB 2533 PS 9V1AEPS 2500 power supply Cables 35 m CA 68 3R 68 35 3 feet CA 68 65 6 feet CAOFF x Signal conditioning accessories MCC provides signal termination products for use with the USB 2533 Refer to the Field wiring and signal termination section for a complete list of compatible accessory products Additional documentation In addition to this hardware user s guide you should also receive the Quick Start Guide available in PDF at www mccdaq com PDFmanuals DA Q Software Quick Start pdf This booklet supplies a brief description of the software you received with your USB 2533 and information regarding installation of that software Please read this booklet completely before installing any software or hardware Unpacking the USB 2533 As with any electronic device you should take care while handling to avoid damage from static electricity Before removing the USB 2533 from its packaging ground yourself using a wrist strap or by simply touching the computer chassis or other grounded object to eliminate any stored static charge
10. data acquisition starts when the trigger is received and the acquisition stops when the stop trigger event is received Fixed pre trigger with post trigger stop event In this mode you set the number of pre trigger readings to acquire The acquisition continues until a stop trigger event occurs 30 0898 2533 User s Guide Functional Details No pre trigger infinite post trigger In this mode no pre trigger data is acquired Instead data is acquired beginning with the trigger event and is terminated when you issue a command to halt the acquisition Fixed pre trigger with infinite post trigger You set the amount of pre trigger data to acquire Then the system continues to acquire data until the program issues a command to halt acquisition Counter inputs Four 32 bit counters are built into the USB 2533 Each counter accepts frequency inputs up to 20 MHz USB 2537 counter channels can be configured as standard counters or as multi axis quadrature encoders The counters can concurrently monitor time periods frequencies pulses and other event driven incremental occurrences directly from pulse generators limit switches proximity switches and magnetic pick ups Counter inputs can be read asynchronously under program control or synchronously as part of an analog or digital scan group When reading synchronously all counters are set to zero at the start of an acquisition When reading asynchronously counters may be c
11. 22 3 A tee A 50 IER 50 Thermocouples a aei rere et 51 Digital input output Counters Input sequencer Trigger sources and modes Frequency pulse generators ree Dip ie n Pb eerte tug Power consumption External power USB specifications Environmental Mechanical Signal I O connectors and pin out 68 pin SCSI connector pin outs 40 pin header connector pin outs TC connector pin out TB7 Preface About this User s Guide What you will learn from this user s guide This user s guide describes the Measurement Computing USB 2533 data acquisition device and lists the specifications Conventions in this user s guide For more information on Text presented in a box signifies additional information and helpful hints related to the subject matter you are reading Caution Shaded caution statements present information to help you avoid injuring yourself and others damaging your hardware or losing your data bold text Bold text is used for the names of objects on a screen such as buttons text boxes and check boxes italic text Italic text is used for the names of manuals and help topic titles and to emphasize a word or phrase Where to find more information For additional information relevant to the operation of your hardware refer to the Documents subdirectory where you installed the MCC DAQ softwar
12. 2533 If you need a higher timing resolution shorten the scan period Wiring for two encoders Figure 22 shows the single ended connections for two encoders Differential connections do not apply 45 VDC pin 19 Ground to Digital Common Pin 35 36 or 40 Counter 0 CNTO pin 5 To Encoder 1 A Counter 1 CNT1 pin 39 To Encoder 1 B Counter 2 CNT2 pin 4 To Encoder 2 A Counter 3 CNT3 pin 38 To Encoder 2 B Encoder 1 Encoder 2 Figure 22 Two encoders connected to pins on the SCSI connector Connections can instead be made to the associated screw terminals of a connected TB 100 terminal connector option 39 0858 2533 User s Guide Functional Details Each signal A B can be connected as a single ended connection with respect to the common digital ground GND Both encoders can draw their power from the 5 V power output pin 19 on the 68 pin SCSI connector Connect each encoder s power input to 5 V power Connect the return to digital common GND on the same connector Make sure that the current output spec is not violated With the encoders connected in this manner there is no relative positioning information available on encoder 1 or 22 since there is no Z signal connection for either Therefore only distance traveled and velocity can be measured for each encoder Timer outputs Two 16 bit timer outputs are built into the USB 2533 Each timer i
13. AGND 40 AGND 57 0858 2533 User s Guide Specifications J6 Table 19 40 pin header connector pinout labeled J6 on the board 64 channel single ended mode Pin Function Pin Function 1 ACH43 2 59 3 ACH35 4 51 5 AGND 6 58 7 ACH42 8 50 9 ACH34 10 ACH57 11 AGND 12 ACH49 13 ACH41 14 ACH56 15 ACH33 16 ACH48 17 ACH40 18 AGND 19 ACH32 20 ACH63 21 ACH47 22 ACH55 23 ACH39 24 AGND 25 ACH46 26 ACH62 27 ACH38 28 ACH54 29 AGND 30 ACH61 31 ACH45 32 ACH53 33 ACH37 34 ACH60 35 ACH44 36 ACH52 37 ACH36 38 AGND 39 AGND 40 AGND Table 20 40 pin header connector pinout labeled J6 on the board 32 channel differential mode Pin Function Pin Function 1 ACH19 LO 2 ACH27 LO 3 ACH19 HI 4 ACH27 HI 5 AGND 6 ACH26 LO 7 ACH18 LO 8 26 HI 9 ACH18 HI 10 ACH25 LO 11 AGND 12 ACH25 HI 13 ACH17 LO 14 ACH24 LO 15 ACH17 HI 16 ACH24 17 ACH16LO 18 AGND 19 ACH16 HI 20 ACH31 LO 21 ACH23 LO 22 23 ACH23 HI 24 AGND 25 ACH22 LO 26 ACH30 LO 27 ACH22 HI 28 29 AGND 30 ACH29 LO 31 ACH21 LO 32 29 HI 33 ACH21 34 ACH28 LO 35 ACH20 LO 36 ACH28 37 ACH20 38 AGND 39 AGND 40 AGND 58 0858 2533 User s Guide Specifications
14. B At that time we are again outside the limit low and the update process repeats itself Hysteresis mode can also be done with a timer output instead of a FIRSTPORTC digital output port Channel 3 analog input voltage rj e i Detection 30h 9 70h 30h FIRSTPORTC Figure 27 Channel 3 in hysteresis mode Detecting setpoints on a totalizing counter In the following figure Channel 1 is a counter in totalize mode Two setpoints define a point of change for Detect 1 as the counter counts upward The detect output is high when inside the window greater than Limit B the low limit but less than Limit A the high limit In this case the Channel 1 setpoint is defined for the 16 lower bits of channel 1 s 32 bit value The FIRSTPORTC digital output port could be updated on a True condition the rising edge of the detection signal You can also update timer outputs with a value 45 0858 2533 User s Guide Functional Details 65535 Atthis point you can update FIRSTPORTC Limit A Limit B Logical output Figure 28 Channel 1 in totalizing counter mode inside the window setpoint Detection Detection setpoint details Controlling digital and timer outputs You can program each setpoint with an 8 bit digital output byte and corresponding 8 bit mask byte When the setpoint criteria is met the FIRSTPORTC digital outpu
15. Computing Corporation products are not designed with the components required and are not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people HM USB 2533 doc Table of Contents Preface About this User s Guide eres eene enne nn nnn nn nn intr intr astra assa sinas snas s nas tenete sena nna 6 What you will learn from this user s guide 6 Conventions in this user s gulde 3 iini ERR RERO ERU On RR EUR p rud 6 Where to find more information 3 adno tonta be n etat e dr 6 Chapter 1 Introducing the 2533 7 Overview USBz2533 feat res ute eto eae aito ere eu FO ree RE FR eh 7 Software features ice ecce d e tr i o eee vedete e red tock e e dere as 7 Chapter 2 Installing the USB 2533 sue tnc eo Gamma Enn anna nea tenants 8 What comes with your USB 2533 shipment HATA Wares RP Optional components IRURE RE ER hoes Signal conditioning accessories Additional doc tientation tet NEP RYE EROS EET ae TE ee YEN IHE Unpacking the USB 2533 5 eed ret d eee seer eed dedere 9 Installing the Software oce tenet pep Eae beatis e 9 Installing the USB22533 delet elle e red RE ILE Pob er MR ae
16. Programmable 12 bit resolution Latency 350 ns typical Accuracy 0 5 of reading 2 mV offset maximum Noise 2 mV RMS typical Single channel analog software trigger The first analog input channel in the scan is the analog trigger channel Input signal range Anywhere within range of the trigger channel Trigger level Programmable 16 bit resolution Latency One scan period maximum External single channel digital trigger TTL trigger input Input signal range 15 V to 15 V maximum Trigger level TTL level sensitive Minimum pulse width 50 ns high 50 ns low Latency One scan period maximum Digital Pattern Triggering 8 bit or 16 bit pattern triggering on any of the digital ports Programmable for trigger on equal not equal above or below a value Individual bits can be masked for don t care condition Latency One scan period maximum Counter Totalizer Triggering Counter totalizer inputs can trigger an acquisition User can select to trigger on a frequency or on total counts that are equal not equal above or below a value or within outside of a window rising falling edge Latency One scan period maximum Frequency pulse generators Table 8 Frequency pulse generator specifications Channels 2 x 16 bit Output waveform Square wave Output rate 1 MHz base rate divided by 1 to 65535 programmable High level output voltage 2 0 minimum 1 0 mA 2 9
17. a 16 bit counter counter low one channel can be scanned at the 12 MHz rate When used as a 32 bit counter counter high two sample times are used to return the full 32 bit result Therefore a 32 bit counter can only be sampled at a 6 MHz maximum rate If you only want the upper 16 bits of a 32 bit counter then you can acquire that upper word at the 12 MHz rate The counter counts up and does not clear on every new sample However it does clear at the start of a new scan command The counter rolls over on the 16 bit counter low boundary or on the 32 bit counter high boundary Clear on read mode The counter counts up and is cleared after each read By default the counter counts up and only clears the counter at the start of a new scan command The final value of the counter the value just before it was cleared is latched and returned to the USB 2533 Stop at the top mode The counter stops at the top of its count The top of the count is FFFF hex 65 535 for the 16 bit mode and FFFFFFFF hex 4 294 967 295 for the 32 bit mode 32 bit or 16 bit Sets the counter type to either 16 bits or 32 bits The type of counter only matters if the counter is using the stop at the top mode otherwise this option is ignored Latch on map Sets the signal on the mapped counter input to latch the count By default the start of scan signal a signal internal to the USB 2533 pulses once every scan period to indicate the start of a scan g
18. arming the acquisition Using the setpoint status register You can use the setpoint status register to check the current state of the 16 possible setpoints In the register Setpoint O is the least significant bit and Setpoint 15 is the most significant bit Each setpoint is assigned a value of 0 or 1 A value of 0 indicates that the setpoint criteria is not met in other words the condition is False value of 1 indicates that the criteria has been met in other words the condition is True In the following example the criteria for setpoints 0 1 and 4 is satisfied True but the criteria for the other 13 setpoints has not been met Setpoint 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 False 0 lt lt lt Most significant bit Least significant bit gt gt gt From the above table we have 10011 binary or 19 decimal derived as follows Setpoint 0 having a True state shows 1 giving us decimal 1 Setpoint 1 having a True state shows 1 giving us decimal 2 Setpoint 4 having a True state shows 1 giving us decimal 16 For proper operation the setpoint status register must be the last channel in the scan list Examples of control outputs Detecting on analog input and FIRSTPORTC updates Update mode Update on True and False Criteria Channel 4 inside window Channel 4 is programmed with reference to two
19. eliminate extraneous noise or switch induced transients Encoder input signals must be within 5 V to 10 V and the switching threshold is TTL 1 3V Quadrature encoders generally have three outputs A B and Z The A and B signals are pulse trains driven by an optical sensor inside the encoder As the encoder shaft rotates a laminated optical shield rotates inside the encoder The shield has three concentric circular patterns of alternating opaque and transparent windows through which an LED shines There is one LED and one phototransistor for each of the concentric circular patterns One phototransistor produces the A signal another phototransistor produces the B signal and the last phototransistor produces the Z signal The concentric pattern for A has 512 window pairs or 1024 4096 etc When using a counter for a trigger source use a pre trigger with a value of at least 1 Since all counters start at zero with the initial scan there is no valid reference in regard to rising or falling edge Setting a pre trigger to 1 or more ensures that a valid reference value is present and that the first trigger is legitimate 36 0858 2533 User s Guide Functional Details The concentric pattern for B has the same number of window pairs as A except that the entire pattern is rotated by 1 4 of a window pair Thus the B signal is always 90 degrees out of phase from the A signal The A and B signals pulse 512 times or 1024 4096 etc per com
20. for acquired data Thermocouple input You can configure up to four analog inputs on the USB 2533 to accept a TC input Built in cold junction sensors are provided for each of the screw terminal connectors and any TC type can be attached to any of the four thermocouple channels When measuring TCs the USB 2533 can operate in an averaging mode taking multiple readings on each channel applying digital filtering and cold junction compensation and then converting the readings to temperature As result the USB 2533 measures channels with TCs attached at a rate from 50 Hz to 10 kHz depending on how much over sampling is selected Additionally a rejection frequency can be specified in which over sampling occurs during one cycle of either 50 Hz or 60 Hz providing a high level of 50 Hz or 60 Hz rejection Tips for making accurate temperature measurements Use as much oversampling as possible Warm up the USB 2533 for 60 minutes including TC wires so that it is thermally stabilized This warm up time enables the CJC thermistors to more accurately measure the junction at the terminal block Make sure the surrounding environment is thermally stabilized and ideally around 20 C to 30 If the board s ambient temperature is changing due to a local heating or cooling source then the TC junction temperature may be changing and the CJC thermistor will have a larger error Use small diameter instrument grade TC wire Small diam
21. of Scan FIRSTPORTC Figure 29 Example of FIRSTPORTC latency By applying a setpoint on analog input channel 2 that setpoint gets evaluated every 10 us with respect to the sampled data for channel 2 Due to the pipelined architecture of the analog to digital converter system the setpoint cannot be evaluated until 2 us after the ADC conversion In the example above the FIRSTPORTC digital output port can be updated no sooner than 2 us after channel 2 has been sampled or 3 us after the start of the scan This 2 us delay is due to the pipelined ADC architecture The setpoint is evaluated 2 us after the ADC conversion and then FIRSTPORTC can be updated immediately The detection circuit works on data that is put into the acquisition stream at the scan rate This data is acquired according to the pre acquisition setup scan group scan period etc and returned to the PC Counters are latched into the acquisition stream at the beginning of every scan The actual counters may be counting much faster than the scan rate and therefore only every 10 100 or count shows up in the acquisition data As a result you can set a small detection window on a totalizing counter channel and have the detection setpoint stepped over since the scan period was too long Even though the counter value stepped into and out of the detection window the actual values going back to the PC may not This is true no matter what mode the counter channel is in
22. scanning bandwidth as long as there is at least one analog channel in the scan group The 16 bits of digital input are sampled for every analog sample in the scan group This allows up to 1 MHz digital input sampling while the 1 MHz analog sampling bandwidth is aggregated across many analog input channels The scan period be made much longer than 6 us up to 1 second The maximum scan frequency is one divided by 6 us or 166 666 Hz Note that digital input channel sampling is not done during the dead time of the scan period where no analog sampling is being done either 26 0858 2533 User s Guide Functional Details Start of Scan Start of Scan Start of Scan Start of Scan n a C2 C2 C1 C1 C1 co co co co BEBE ERES ARE ARE E 012 5111315 0 2 5 111315 012 5 11 13 15 012 5 11113 15 1us i Sean Period Figure 11 Analog and digital scanning once per scan mode example If the three counter channels are all returning 32 bit values and the digital input channel is returning a 1 bit value then 18 samples are returned to the PC every scan period with each sample being 16 bits Each 32 bit counter channel is divided into two 16 bit samples one for the low word and the other for the high word If the maximum scan frequency is 166 666 Hz then the data bandwidth streaming into the PC is 3 MS s Some slower PCs may have a problem with data bandwidths greater than 6 MS s The USB 2533 has an onboard 1 MS buffer
23. to T1 the debounce time setting for this example Therefore the output stays high and does not change state during time period T2 T3 During time period the input signal is stable for a time period equal to T1 meeting the debounce requirement The output is held at the high state This is the same state as the input T4 At anytime during time period T4 the input can change state When this happens the output will also change state At the end of time period T4 the input changes state going low and the output follows this action by going low T5 During time period 5 the input signal again has disturbances that cause the input to not meet the debounce time requirement The output does not change state T6 After time period T6 the input signal has been stable for the debounce time and therefore any edge on the input after time period T6 is immediately reflected in the output of the debounce module Debounce mode comparisons Figure 16 shows how the two modes interpret the same input signal which exhibits glitches Notice that the trigger before stable mode recognizes more glitches than the trigger after stable mode Use the bypass option to achieve maximum glitch recognition 34 0858 2533 User s Guide Functional Details Debounce Debounce 1 Debounce j Time Time Time r cc Input i Trigger Before Stable Trigger After Stable bog 1
24. you would set the analog input voltage to a start value that is less than 40 9 V 1 V 2 V 2 2 5 Digital triggering A separate digital trigger input line is provided TTL TRG allowing TTL level triggering with latencies guaranteed to be less than 1 us You can program both of the logic levels 1 or 0 and the rising or falling edge for the discrete digital trigger input Software based triggering The three software based trigger modes differ from hardware analog triggering and digital triggering because the readings analog digital or counter are checked by the PC in order to detect the trigger event 29 0898 2533 User s Guide Functional Details Analog triggering You can select any analog channel in the scan as the trigger channel You can program the trigger level the rising or falling edge and hysteresis Pattern triggering You can select any scanned digital input channel pattern to trigger an acquisition including the ability to mask or ignore specific bits Counter triggering You can program triggering to occur when one of the counters meets or exceeds a set value or is within a range of values You can program any of the included counter channels as the trigger source Software based triggering usually results in a long period of inactivity between the trigger condition being detected and the data being acquired However the USB 2533 avoids this situation by using pre trigger data When softwar
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26. 1 1 1 1 r 1 1 1 1 1 i 1 1 1 1 1 1 1 1 Figure 16 Example of two debounce modes interpreting the same signal Debounce times should be set according to the amount of instability expected in the input signal Setting a debounce time that is too short may result in unwanted glitches clocking the counter Setting a debounce time too long may result in an input signal being rejected entirely Some experimentation may be required to find the appropriate debounce time for a particular application To see the effects of different debounce time settings simply view the analog waveform along with the counter output This can be done by connecting the source to an analog input Use trigger before stable mode when the input signal has groups of glitches and each group is to be counted as one The trigger before stable mode recognizes and counts the first glitch within a group but rejects the subsequent glitches within the group if the debounce time is set accordingly The debounce time should be set to encompass one entire group of glitches as shown in the following diagram Debounce Time Input Trigger Before Stable Trigger After Stable Figure 17 Optimal debounce time for trigger before stable mode Trigger after stable mode behaves more like a traditional debounce function rejecting glitches and only passing state transitions after a required period of stability Trigger after stable mode is used wi
27. 2533 Every range of a USB 2533 device is calibrated at the factory using a digital NIST traceable calibration method This method works by storing a correction factor for each range on the unit at the time of calibration For analog inputs the user can adjust the calibration of the board while it is installed in the acquisition system This does not destroy the factory calibration supplied with the board This is accomplished by having two distinct calibration tables in the USB 2533 on board which contains the factory calibration and the other which is available for field calibration You can perform field calibration automatically in seconds with InstaCal and without the use of external hardware or instruments Field calibration derives its traceability through an on board reference which has a stability of 0 00596 per year Note that a two year calibration period is recommended for USB 2533 boards You should calibrate the USB 2533 using InstaCal after the board has fully warmed up The recommended warm up time is 30 minutes For best results calibrate the board immediately before making critical measurements The high resolution analog components on the board are somewhat sensitive to temperature Pre measurement calibration ensures that your board is operating at optimum calibration values 49 Chapter 5 Specifications Typical for 25 unless otherwise specified Specifications in italic text are guarante
28. If any components are missing or damaged notify Measurement Computing Corporation immediately by phone fax or e mail Phone 508 946 5100 and follow the instructions for reaching Tech Support Fax 508 946 9500 to the attention of Tech Support Email techsupport mccdaq com Installing the software Refer to the Quick Start Guide for instructions on installing the software on the Measurement Computing Data Acquisition Software CD This booklet is available in PDF at www mccdaq com PDFmanuals DA Q Software Quick Start pdf We recommend that you download the latest Windows Update onto your computer before installing and operating the USB 2533 USB 2533 User s Guide Installing the USB 2533 Installing the USB 2533 To connect the USB 2533 to your system turn your computer on and connect the USB cable to a USB port on your computer or to an external USB hub that is connected to your computer The USB cable provides power and communication to the USB 2533 When you connect the USB 2533 to a computer for the first time a Found New Hardware dialog opens when the operating system detects the device When the dialog closes the installation is complete The power LED bottom LED blinks during device detection and initialization and then remains solid as long as the USB 2533 has sufficient power If the power provided from the USB is not sufficient the LED turns off indicating you need a PS 9V1AEPS 2500 power supply When
29. Outside the window high forces one output designated Output 2 outside the window low forces another output designated as Output 1 Detect Rising Edge Detect Falling Edge Condition True Condition False Channel ___ Input Criteria Condition Action A digital detect signal is used to indicate when a signal condition is True or False for example whether or not the signal has met the defined criteria The detect signals can be part of the scan group and can be measured as any other input channel thus allowing real time data analysis during an acquisition The detection module looks at the 16 bit data being returned on a channel and generates another signal for each channel with a setpoint applied Detect for Channel 1 Detect2 for Channel 2 and so on These signals serve as data markers for each channel s data It does not matter whether that data is volts counts or timing A channel s detect signal shows a rising edge and is True 1 when the channel s data meets the setpoint criteria The detect signal shows a falling edge and is False 0 when the channel s data does not meet the setpoint criteria The True and False states for each setpoint criteria are explained in the Using the setpoint status register section on page 43 Criteria input signal is equal to X Action driven by condition Compare X to Setpoint definition choose one Update conditions True only True then output value 1 If False th
30. TL TRG CNTO CNT2 TMRO XAPCR XDPCR 13 USB 2533 User s Guide Installing the USB 2533 TB 100 terminal board connector to SCSI connector pin out SCSI connector pin out assignments for TB 7 terminal board connector differential analog signals in parentheses TB2 screw terminals SCSI pin TB1 screw terminal SCSI pin 45V 19 ACHO ACHO HI 68 GND id 8 ACHO LO 34 18 AGND id Al 52 ACH1 HI 33 A2 17 ACH9 ACH1 LO 66 A3 51 AGND id A4 16 ACH 2 HI 65 A5 50 ACH10 ACH2 LO 31 A6 15 AGND f A7 49 ACH3 HI 30 BO 14 ACH11 63 1 48 AGND iid B2 13 ACH4 ACH4 HI 28 B3 47 ACH12 ACH4 LO 61 B4 12 AGND ii B5 46 5 5 60 6 11 ACH13 5 LO 26 B7 45 AGND pu CO 10 ACH6 ACH6 25 C1 44 ACH14 ACH6 LO 58 C2 9 AGND di 43 ACH7 ACH7 HI 57 C4 8 ACH15 ACH7 LO 23 C5 42 NC 56 C6 7 SGND 62 C7 41 POSREF reserved for self calibration 20 TTLTRG 6 NC 55 GND NEGREF reserved for self calibration 54 CNTO 5 AGND T CNT1 39 NC 22 CNT2 4 AGND T CNT3 38 NC 21 TMRO 3 AGND E TMR1 37 XAPCR 2 XDPCR 1 GND Tf GND EGND t Digital common ground pins on the SCSI connector are 35 36 and 40 Analog common ground pins on the SCSI connector are 24 27 29 32 59 64 and 67 T EGND is connected to the SCSI connector shell
31. USB 2533 64 Single ended 32 Differential Analog Inputs includes 4 Thermocouple Inputs 24 Digital 1 0 Four 32 bit Counter Input Channels Ww Fa MEASUREMENT 4 W v COMPUTING USB 2533 Multifunction Measurement and Control User s Guide Wa A a AT Un MEASUREMENT COMPUTING Document Revision 6 January 2011 Copyright 2011 Measurement Computing Corporation Your new Measurement Computing product comes with a fantastic extra Management committed to your satisfaction Thank you for choosing a Measurement Computing product and congratulations You own the finest and you can now enjoy the protection of the most comprehensive warranties and unmatched phone tech support It s the embodiment of our mission To provide data acquisition hardware and software that will save time and save money Simple installations minimize the time between setting up your system and actually making measurements We offer quick and simple access to outstanding live FREE technical support to help integrate MCC products into a DAQ system Limited Lifetime Warranty Most MCC products are covered by a limited lifetime warranty against defects in materials or workmanship for the life of the product to the original purchaser unless otherwise noted Any products found to be defective in material or workmanship will be repaired replaced with same or similar device or refunded at MCC s discretion For specific information please refer
32. and stayed there for the required amount of time therefore the output transitions high If the input signal does not stabilize in the high state long enough no transition would have appeared on the output and the entire disturbance on the input would have been rejected T3 During time period T3 the input signal remained steady No change in output is seen T4 During time period T4 the input signal has more disturbances and does not stabilize in any state long enough No change in the output is seen T5 At the end of time period T5 the input signal has transitioned low and stayed there for the required amount of time therefore the output goes low Trigger before stable mode In the trigger before stable mode the output of the debounce module immediately changes state but will not change state again until a period of stability has passed For this reason the mode can be used to detect glitches Figure 15 Debounce module Trigger before stable mode The following time periods T1 through T6 pertain to the above drawing T1 In the illustrated example the input signal is low for the debounce time equal to T1 therefore when the input edge arrives at the end of time period 1 it is accepted and the output of the debounce module goes high Note that a period of stability must precede the edge in order for the edge to be accepted T2 During time period T2 the input signal is not stable for a length of time equal
33. annels 0 and 1 to directly measure TCs In this mode oversampling is programmable up to 16384 oversamples per channel in the scan group When oversampling is applied it is applied to all analog channels in the scan group including temperature and voltage channels Digital channels are not oversampled If you want 256 oversamples then each analog channel in the scan group takes 256 and the returned 16 bit value represents an average of 256 consecutive 1 us samples of that channel The acquisition is triggered and 16 bit values each representing an average of 256 stream to the PC via the USB cable Since two of the channels in the scan group are temperature channels you need the acquisition engine to read a cold junction compensation CJC temperature every scan Start of Scan Start of Scan Start of Scan Start of Scan TC CJC TC TC mi cJc TC a _ osc TC CJC TC 12 13 5 11 0 Y 1 33 Ios s 9 114 Programmable gt Averaging Scan up to 256 Period Figure 9 Analog channel scanning of voltage and temperature inputs example Since the targeted number of oversamples is 256 in this example each analog channel in the scan group requires 256 microseconds to return one 16 bit value The oversampling is also done for CJC temperature measurement channels making the minimum scan period for this example 7 X 256 us or 1792 us The maximum scan frequency is the inverse of this nu
34. atic electricity can damage some electronic components Semiconductor devices are especially susceptible to ESD damage Connecting the board for I O operations Connectors cables main I O connector The following table lists the board connectors applicable cables and compatible accessory products for the USB 2533 Board connectors cables and compatible hardware Parameter Specification Connector type Main connector 68 pin standard SCSI type III female connector Auxiliary connectors Four 40 pin header connectors Compatible cables main connector CA 68 3R 68 pin ribbon cable 3 feet CA 68 3S 68 pin shielded round cable 3 feet CA 68 6S 68 pin shielded round cable 6 feet Compatible cables 40 pin connectors C40FF x Compatible accessory products using the TB 100 terminal connector CA 68 3R 68 35 or CA 68 6S cables Compatible accessory products using the CIO MINI40 C40FF x cable 11 0898 2533 User s Guide Installing the USB 2533 68 pin SCSI connector differential and single ended pin outs P5 The 68 pin SCSI connector labeled P5 on board provides 16 single ended analog channels or eight differential analog channels Refer to the 40 pin header connector pin outs section starting on page 15 to learn the pin outs for accessing up to 64 single ended 32 differential analog channels using the P5 and P6 connectors Caution Avoid redundant co
35. bit low limit so 16 bit high limit is not used Less than value Signal is below 16 bit high limit so 16 bit low limit is not used Equal to value Signal is equal to 16 bit high limit and limit is not used The equal to mode is intended for use when the counter or digital input channels are the source channel You should only use the equal to16 bit high limit limit A mode with counter or digital input channels as the channel source If you want similar functionality for analog channels then use the inside window mode Hysteresis mode Outside the window high forces output 2 until an outside the window low condition exists then output 1 is forced Output 1 continues until an outside the window high condition exists The cycle repeats as long as the acquisition is running in hysteresis mode 42 0858 2533 User s Guide Functional Details Set output channel None Update FIRSTPORTC Update timerx Update modes Update on True only Update on True and False Set values for output FIRSTPORTC value or timer value when input meets criteria FIRSTPORTC value or timer value when input does not meet criteria By default FIRSTPORTC comes up as a digital input You may want to initialize FIRSTPORTC to a known state before running the input scan to detect the setpoints When using setpoints with triggers other than immediate hardware analog or TLL the setpoint criteria evaluation begins immediately upon
36. ctors pin out labeled J5 and J6 32 channel differential mode Analog channel Pin J5 Pin Analog channel Analog channel Pin J6 Pin Analog channel ACHI1LO 9 9 ACH27LO ACH10LO 3 4 ACH10HI 9 4 ACH27HI AGND 5 6 AGND AGND 5 II 6 ACH26LO 7 8 ACHi8LO 7 8 26 2 9 II 10 210 8 9 10 2510 ACH9HI 11 II 12 ACH9LO AGND 11 II 12 ACH25 HI ACH8HI 13 14 ACH8LO ACH17LO 13 14 ACH24 LO ACH1HI 15 16 ACH1LO 17 15 II 16 ACH24 HI 17 18 ACHOLO ACH16LO 17 18 AGND AGND 19 II 20 AGND 19 20 ACH31LO 5 21 22 151 ACH23LO 21 22 ACH14HI 23 II 24 1410 23 23 II 24 AGND 25 ACH7LO ACH22LO 25 26 ACH30LO ACH6HI 27 II 28 ACH6LO 22 27 II 28 AGND 29 30 AGND 29 30 ACH29LO ACH13LO 81 II 32 ACH12HI ACH21LO 81 II 32 ACH29HI ACH12LO 33 ESI 34 5 21 33 I 34 2810 ACH5LO 35 II 36 ACH4 HI ACH20LO 35 II 36 ACH28HI ACH4LO 37 II 38 AGND 20 37 II 38 AGND AGND 39 40 AGND AGND 39 40 AGND 16 0898 2533 User s Guide Installing the USB 2533 Digital ports counters timers triggers and pacer clocks pin out J7 and J8 You can use the 40 pin connector heade
37. e C Program Files Measurement Computing DAQ by default or search for your device on our website at www mccdaq com Chapter 1 Introducing the USB 2533 Overview USB 2533 features The USB 2533 is supported under popular Microsoft Windows operating systems The USB 2533 board is a multifunction measurement and control board designed for the USB bus The USB 2533 provides either 32 differential or 64 single ended analog inputs with 16 bit resolution from its 40 pin connectors It offers seven software selectable analog input ranges of 10 V 5 V 2 V 1 V 0 5 V 0 2 V and 0 1V You can configure up to four of the analog inputs as differential thermocouple TC inputs The board has 24 high speed lines of digital I O two timer outputs and four 32 bit counters It provides up to 4 MHz scanning on all digital input lines You can operate all analog I O digital I O and counter timer I O synchronously Software features For information on the features of InstaCal and the other software included with your USB 2533 refer to the Quick Start Guide that shipped with your device Higher rates up to 12 MHz are possible depending on the platform and the amount of data being transferred 7 Chapter 2 Installing the USB 2533 What comes with your USB 2533 shipment As you unpack your USB 2533 verify that the following components are included Hardware USB 2533 with seven standoffs
38. e leave the shield at the other end of the thermocouple unconnected Caution Connecting the shield to common at both ends results in a ground loop Averaging Certain acquisition programs apply averaging after several samples have been collected Depending on the nature of the noise averaging can reduce noise by the square root of the number of averaged samples Although averaging can be effective it suffers from several drawbacks Noise in measurements only decreases as the square root of the number of measurements reducing RMS noise significantly may require many samples Thus averaging is suited to low speed applications that can provide many samples Only random noise is reduced or eliminated by averaging Averaging does not reduce or eliminate periodic signals Digital I O Twenty four TTL level digital I O lines are included in each USB 2533 You can program digital I O in 8 bit groups as either inputs or outputs and scan them in several modes see Digital input scanning below You can access input ports asynchronously from the PC at any time including when a scanned acquisition is occurring Digital input scanning Digital input ports can be read asynchronously before during or after an analog input scan Digital input ports can be part of the scan group and scanned along with analog input channels Two synchronous modes are supported when digital inputs are scanned along with analog inputs Refer to Example 4
39. e based triggering is used and the PC detects the trigger condition which may be thousands of readings after the actual occurrence of the signal the USB 2533 driver automatically looks back to the location in memory where the actual trigger causing measurement occurred and presents the acquired data that begins at the point where the trigger causing measurement occurs The maximum inactive period in this mode equals one scan period Set pre trigger 0 when using counter as trigger source When using a counter for a trigger source you should use a pre trigger with a value of at least 1 Since all counters start at zero with the first scan there is no valid reference in regard to rising or falling edge Setting a pre trigger to 1 or more ensures that a valid reference value is present and that the first trigger will be legitimate Stop trigger modes You can use any of the software trigger modes explained previously to stop an acquisition For example you can program an acquisition to begin on one event such as a voltage level and then stop on another event such as a digital pattern Pre triggering and post triggering modes The USB 2533 supports four modes of pre triggering and post triggering providing a wide variety of options to accommodate any measurement requirement When using pre trigger you must use software based triggering to initiate an acquisition No pre trigger post trigger stop event In this simple mode
40. ed by design Analog input Table 1 Analog input specifications A D converter type Successive approximation Resolution 16 bits Number of channels 64 single ended 32 differential software selectable Input ranges SW programmable Bipolar 10 V 5 V 2 V 1 V 0 5 V 0 2 V 0 1 V Maximum sample rate 1 MHz Nonlinearity integral 2 LSB maximum Nonlinearity differential 1 LSB maximum A D pacing Onboard input scan clock external source XAPCR Trigger sources and modes See Table 7 Acquisition data buffer 1 MSample Configuration memory Programmable I O Maximum usable input voltage Range 10 V 5 V 2 1 V 10 5 V maximum 40 5 V common mode voltage CMV Vin Range 0 2 0 1 V 2 1 maximum Signal to noise distortion 72 dB typical for X10 V range 1 kHz fundamental Total harmonic distortion 80 dB typical for 10 V range 1 kHz fundamental Calibration Auto calibration calibration factors for each range stored onboard in non volatile RAM CMRR 60 Hz 70 dB typical DC to 1 kHz Bias current 40 pA typical 0 to 35 Crosstalk 75 dB typical DC to 60Hz 65 dB typical 10kHz Input impedance 10 MQ single ended 20 MQ differential Absolute maximum input voltage 30 Accuracy Table 2 Analog input accuracy specifications
41. efour channel TC screw terminal block Two LED indicators USB and power Figure 6 USB 2533 components 21 0858 2533 User s Guide Functional Details SCSI 68 pin P5 connector The 68 pin SCSI connector includes pins for the following 16 single ended eight differential analog inputs 64 single ended 32 differential analog inputs available only from J5 and J6 40 pin connectors 24 digital I O Four counter inputs Two timer outputs Input scan pacer clock I O Output scan pacer clock I O TTL trigger self calibration 45 VDC analog commons digital commons 40 pin headers J5 J6 J7 J8 Four 40 pin headers J5 through J8 provide alternative connections to the signals of the SCSI connector Up to 64 single ended 32 differential analog inputs are available from J5 and J6 connectors as well You can get a female connector for each header by connecting a C40FF x cable 40 pin header to female 40 pin header to each header 9 slot screw terminal TB7 You can use the on board screw terminal connector TB7 to connect up to four TC inputs TB7 uses the following analog channels to obtain its four differential channels TC CHO CH 8 TC CHI CH 1 CH 9 TC CH2 CH 2 CH 10 TC CH3 CH 3 CH 11 When using the thermocouple channels do not connect signals to the associated channels on the SCSI connector or J5 External power connec
42. en perform no action True and False If True then output value 1 False then output value 2 True only True then output value 1 Window non nside B X A Jf False then perform no action hysteresis mode Outside B gt X or X gt A True and False True then output value 1 If False then output value 2 Hysteresis mode forced update If X gt A is True then output value 2 until X lt B is True then output value 1 fX B is True then output value 1 until X gt A is True then output value 2 This is saying a If the input signal is outside the window high then output value 2 until the signal goes outside the window low and b if the signal is outside the window ow then output value 1 until the signal goes outside the window high There is no change to the detect signal while within the window Equal to A X A Limit A or LimitB Below A X lt A Above B X gt B Above A X gt A Window Below B X lt B Both hysteresis mode conditions are checked when in hysteresis mode The detect signal has the timing resolution of the scan period as seen in the diagram below The detect signal can change no faster than the scan frequency 1 scan period 41 0858 2533 User s Guide Functional Details Detectl Detect2 Detect3 Acquisition stream i Scan Group H 1 2 3 4 Scan Figure 24
43. encoder s output driver to pull down with more current Wiring to one encoder Figure 20 shows the connections for one encoder to a module The following figure illustrates connections for one encoder to a 68 pin SCSI connector on a USB 2533 The A signal must be connected to an even numbered channel and the associated B signal must be connected to the next higher odd numbered channel For example if A were connected to CTRO B would be connected to ppm 5 VDC pin 19 Ground to Digital Common pin 35 36 40 To ground of external power source Counter 0 CNTO 5 To Encoder Counter 1 CNT1 39 To Encoder Counter 2 CNT2 4 To Encoder 2 ENCODER Figure 20 Encoder connections to pins on the SCSI connector Connections can instead be made to the associated screw terminals of a connected TB 100 terminal connector option The A signal must be connected to an even numbered channel and the associated B signal must be connected to the next higher odd numbered channel For example if A were connected to counter 0 then B would be connected to counter 1 If the encoder stops rotating but is vibrating due to it being mounted to a machine you can use the debounce feature to eliminate false edges Choose an appropriate debounce time and apply it to each encoder channel Refer to the Debounce modes section in the Functional Details chapter in this
44. er channels may return only the lower 16 bits of count value if that is sufficient for the application They could also return the full 32 bit result if necessary Similarly the digital input channel could be the full 24 bits if desired or only eight bits if that is sufficient If the three counter channels are all returning 32 bit values and the digital input channel is returning a 16 bit value then 13 samples are being returned to the PC every scan period with each sample being 16 bits The 32 bit counter channels are divided into two 16 bit samples one for the low word and the other for the high word If the maximum scan frequency is 166 666 Hz then the data bandwidth streaming into the PC is 2 167 MS s Some slower PCs may have a problem with data bandwidths greater than 6 MS s The USB 2533 has an onboard 1 MS buffer for acquired data Example Sampling digital inputs for every analog sample in a scan group The scan is programmed pre acquisition and is made up of six analog channels Ch2 Ch5 Ch11 Ch13 Ch15 and four digital channels 16 bits of digital input three counter inputs Each of the analog channels can have a different gain The acquisition is triggered and the samples stream to the PC via the USB cable Each analog channel requires one microsecond of scan time therefore the scan period can be no shorter than 6 us for this example All of the digital channels are sampled at the start of scan and do not require additional
45. eter TC wire has less effect on the TC junction at the terminal block because less heat is transferred from the ambient environment to the junction Use shielded TC wire see Shielding on page 28 with the shield connected to analog common to reduce noise The USB 2533 has several analog common pins on both the 68 pin connector and the 40 pin connectors and the TB 7 has one analog common screw terminal You can also minimize the effect of noise by averaging readings see Averaging on page 28 or combining both shielding and averaging Refer to 68 pin SCSI connector differential and single ended pin outs P5 on page 12 40 pin header connector pin outs on page 15 and Four channel TC terminal pin out TB7 on page 18 for the locations of these analog common pins 27 USB 2533 User s Guide Functional Details Make sure the USB 2533 is mounted on a flat surface Be careful to avoid loading down the digital outputs too heavily 21 mA Heavy load down causes significant heat generation inside the unit and increase the CJC thermistor error Shielding Use shielded TC wire with the shield connected to analog common to further reduce noise The USB 2533 has one analog common screw terminal on TB7 and several analog common pins on the headers see Connecting the board for I O operations starting on page 11 You can connect the shield of a shielded thermocouple to one of the analog commons When this connection is mad
46. imum Programmable parameters per scan Programmable channels random order programmable gain Depth 512 locations Onboard channel to channel scan rate Analog 1 MHz maximum Digital 4 MHz if no analog channels are enabled 1 MHz with analog channels enabled External input scan clock XAPCR maximum rate Analog 1 MHz Digital 4 MHz if no analog channels are enabled 1 MHz with analog channels enabled Clock signal range Logical zero 0 V to 0 8 V Logical one 2 4 V to 5 0 V Minimum pulse width 50 ns high 50 ns low Note 4 The maximum scan clock rate is the inverse of the minimum scan period The minimum scan period is equal to 1 us times the number of analog channels If a scan contains only digital channels then the minimum scan period is 250 ns Some platforms can sustain scan rates up to 83 33 ns for digital only scans 52 0858 2533 User s Guide Specifications Trigger sources and modes Table 7 Trigger sources and modes Input scan trigger sources Single channel analog hardware trigger Single channel analog software trigger External single channel digital trigger TTL TRG input Digital Pattern Trigger Counter Totalizer Trigger Input scan triggering modes Single channel analog hardware trigger The first analog input channel in the scan is the analog trigger channel Input signal range 10 V to 10 V maximum Trigger level
47. in connector specifications Connector type 68 pin standard SCSI TYPE III female connector P5 four 40 pin headers J5 J6 J7 J8 AMP 2 103328 0 Temperature measurement connector 4 channel TC screw terminal block TB7 Phoenix MPT 0 5 9 2 54 Compatible cables for the 68 pin SCSI connector CA 68 3R 68 pin ribbon cable 3 feet CA 68 3S 68 pin shielded round cable 3 feet CA 68 6S 68 pin shielded round cable 6 feet Compatible cables for the 40 pin header connectors C40FF Compatible accessory products for the 68 pin SCSI TB 100 termination board with screw terminals connector RM TB 100 19 inch rack mount kit for TB 100 Compatible accessory products for the 40 pin header CIO MINI40 connectors 54 0858 2533 User s Guide Specifications 68 pin SCSI connector pin outs Table 15 68 pin SCSI connector pin out labeled P5 on the board single ended mode Pin Function Pin Function 68 ACHO 34 ACH8 67 AGND 33 ACH1 66 ACH9 32 AGND 65 ACH2 31 ACH10 64 AGND 30 63 11 29 AGND 62 SGND low level sense not for general use 28 ACH4 61 ACH12 27 AGND 60 ACH5 26 ACH13 59 AGND 25 ACH6 58 ACH14 24 AGND 57 ACH7 23 ACH15 56 NC 22 NC 55 NC 21 NC 54 NEGREF reserved for self calibration 20 POSREF reserved for self ca
48. its default of 1 us However if you are scanning multiple channels and one or more channels are connected to a high impedance source you may get better results by increasing the settling time Remember that increasing the settling reduces the maximum acquisition rate You can set the settling time to 1 us 5 us 10 or 1 ms Example Analog channel scanning of voltage inputs Figure 8 shows a simple acquisition The scan is programmed pre acquisition and is made up of six analog channels Ch1 Ch3 Ch4 Ch6 and Ch7 Each of these analog channels can have a different gain The acquisition is triggered and the samples stream to the PC Using the default settling time each analog channel requires one microsecond of scan time therefore the scan period can be no shorter than 6 us for this example The scan period can be made much longer than 6 us up to s The maximum scan frequency is 1 divided by 6 us or 166 666 Hz 24 USB 2533 User s Guide Functional Details Start of Scan Start of Scan Start of Scan Start of Scan prm o 1 4 e r 4 e 7 1 3 4 e 7 1 us Scan Period Figure 8 Analog channel scan of voltage inputs example Example Analog channel scanning of voltage and temperature inputs Figure 9 shows a programmed pre acquisition scan made up of six analog channels ChO Ch1 Ch5 Ch11 Ch12 Ch13 Each of these analog channels can have a different gain You can program ch
49. leared on each read count up continually or count until the 16 bit or 32 bit limit has been reached See the counter mode descriptions below 5V 5V 10 KQ 68 SCSI Counter Connector 1 2 KQ Figure 12 Typical USB 2533 counter channel Mapped channels A mapped channel is one of four counter input signals that can get multiplexed into a counter module The mapped channel can participate with the counter s input signal by gating the counter latching the counter and so on The four possible choices for the mapped channel are the four counter input signals post debounce A mapped channel can be used to gate the counter decrement the counter latch the current count to the count register Usually all counter outputs are latched at the beginning of each scan within the acquisition However you can use a second mapped channel to latch the counter output 31 0898 2533 User s Guide Functional Details Counter modes A counter can be asynchronously read with or without clear on read The asynchronous read signals strobe when the lower 16 bits of the counter are read by software The software can read the counter s high 16 bits some time later after reading the lower 16 bits The full 32 bit result reflects the timing of the first asynchronous read strobe Totalize mode The Totalize mode allows basic use of a 32 bit counter While in this mode the channel s input can only increment the counter upward When used as
50. libration 53 GND 19 5 V see Note 6 52 A1 18 51 17 A2 50 A5 16 A4 49 A7 15 A6 48 B1 14 BO 47 B3 13 B2 46 B5 12 B4 45 B7 11 B6 44 C1 10 43 C3 9 C2 42 C5 8 C4 41 C7 7 C6 40 GND 6 TTL TRG 39 ONT1 5 CNTO 38 CNT3 4 CNT2 37 TMR1 3 TMRO 36 GND 2 XAPCR input scan clock 35 GND 1 XDPCR output scan clock 55 USB 2533 User s Guide Specifications Table 16 68 pin SCSI connector pin out labeled P5 on the board differential mode Pin Function Pin Function 68 ACHOHI 34 ACHO LO 67 AGND 33 HI 66 ACH1LO 32 AGND 65 ACH2HI 31 ACH2 LO 64 AGND 30 HI 63 ACH3 LO 29 AGND 62 SGND low level sense not for general use 28 61 ACHALO 27 AGND 60 ACH5 HI 26 ACH5 LO 59 AGND 25 ACH6 HI 58 ACH6 LO 24 AGND 57 ACH7HI 23 ACH7 LO 56 NC 22 NC 55 NC 21 NC 54 NEGREF reserved for self calibration 20 POSREF reserved for self calibration 53 GND 19 5 V see Note 6 52 AM 18 A0 51 17 A2 50 A5 16 A4 49 A7 15 A6 48 B1 14 BO 47 B3 13 B2 46 B5 12 B4 45 B7 11 B6 44 C1 10 CO 43 9 C2 42 C5 8 C4 41 C7 7 C6 40 GND 6 TTL TRG 39 CNT1 5 CNTO 38 CNT3 4 CNT2 37 TMR1 3 TMRO 36 GND 2 XAPCR input scan clock 35 GND 1 XDPCR output scan clock Note 6 5 V outp
51. manual for additional information regarding debounce times You can get the relative position and velocity from the encoder However during an acquisition you cannot get data that is relative to the Z position until the encoder locates the Z reference 38 0858 2533 User s Guide Functional Details Note that the number of Z reference crossings can be tabulated If the encoder was turning in only one direction then the Z reference crossings equal the number of complete revolutions This means that the data streaming to the PC is relative position period I velocity and revolutions A typical acquisition might take six readings off of the USB 2533 as illustrated below The user determines the scan rate and the number of scans to take Scan 1 Scan2 Scan3 Scan Period Figure 21 USB 2533 acquisition of six readings per scan Digital channels do not take up analog channel scan time In general the output of each channel s counter is latched at the beginning of each scan period called the start of scan Every time the USB 2533 receives a start of scan signal the counter values are latched and are available to the USB 2533 The USB 2533 clears all counter channels at the beginning of the acquisition This means that the values returned during scan period 1 are always zero The values returned during scan period 2 reflect what happened during scan period 1 The scan period defines the timing resolution for the USB
52. mber 558 Hz For accurate measurements you must associate TC and CJC channels properly The TC channels must immediately follow their associated CJC channels in the channel array For accurate TC readings associate CJCO with TCO CJC1 with TC1 and TC2 and CJC2 with TC3 Example Analog and digital scanning once per scan mode The scan is programmed pre acquisition and is made up of six analog channels Ch2 Ch5 Ch11 Ch13 Ch15 and four digital channels 16 bits of digital IO three counter inputs Each of the analog channels can have a different gain 25 0898 2533 User s Guide Functional Details The acquisition is triggered and the samples stream to the PC via the USB cable Each analog channel requires one microsecond of scan time Therefore the scan period can be no shorter than 6 us for this example All of the digital channels are sampled at the start of scan and do not require additional scanning bandwidth as long as there is at least one analog channel in the scan group The scan period can be made much longer than 6 us up to 1 second The maximum scan frequency is one divided by 6 us or 166 666 Hz Start of Scan Start of Scan Start of Scan Start of Scan Li t C2 C2 C1 col co ico D D D 0 2 5 11135 2 5 111 13 15 12 5 111 13 15 12 5 111 13 115 l Sean Period Figure 10 Analog and digital scanning once per scan mode example The count
53. minimum 400 pA Low level output voltage 0 4 maximum 400 pA Power consumption Table 9 Power consumption specifications Note 5 Power consumption per board 2400 mW 53 USB 2533 User s Guide Specifications External power Table 10 External power specifications Note 5 Connector Switchcraft RAPC 712 Power range 6 to 16 VDC used when USB port supplies insufficient power or when an independent power supply is desired Over voltage 20 V for 10 seconds maximum Note 5 An optional power supply MCC p n PS 9V1AEPS 2500 is required if the USB port cannot supply adequate power USB 2 0 ports are by USB 2 0 standards required to supply 2500 mW nominal at 5 V 500 mA USB specifications Table 11 USB specifications USB device type USB 2 0 high speed mode 480 Mbps if available recommended otherwise USB 1 1 full speed mode 12 Mbps Device compatibility USB 2 0 recommended or USB 1 1 Environmental Table 12 Environmental specifications Operating temperature range 30 C to 70 C Storage temperature range 40 C to 80 C Relative humidity 0 to 95 non condensing Mechanical Table 13 Mechanical specifications Vibration MIL STD 810E cat 1 and 10 Dimensions 152 4 mm W x 150 62 mm D 6 0 x 5 93 Weight 147 g 0 32 Ibs Signal I O connectors and pin out Table 14 Ma
54. module There are 16 different debounce times In either debounce mode the debounce time selected determines how fast the signal can change and still be recognized The two debounce modes are trigger after stable and trigger before stable discussion of the two modes follows Inverter Bypass Debounce Bypass Trigger Before Stable From SCSI Connector To Counters Buffer Inverter Figure 13 Debounce model block diagram Trigger after stable mode In the trigger after stable mode the output of the debounce module does not change state until a period of stability has been achieved This means that the input has an edge and then must be stable for a period of time equal to the debounce time Input Output Figure 14 Debounce module trigger after stable mode The following time periods T1 through T5 pertain to Figure 14 In trigger after stable mode the input signal to the debounce module is required to have a period of stability after an incoming edge in order for that edge to be accepted passed through to the counter module The debounce time for this example is equal to T2 and T5 the example above the input signal goes high at the beginning of time period but never stays high for a period of time equal to the debounce time setting equal to T2 for this example 33 USB 2533 User s Guide Functional Details T2 At the end of time period T2 the input signal has transitioned high
55. nnections Make sure there is no signal conflict among the SCSI pins the 40 pin header connector pins J5 J8 and the TB7 TC connections Failure to do so could possibly cause equipment damage and or personal injury 68 pin SCSI connector pin out labeled P5 on the board 16 channel single ended mode Signal name ACHO AGND ACH9 ACH2 AGND ACH11 SGND ACH12 5 AGND ACH14 ACH7 NC NC NEGREF reserved for self calibration GND Al A3 A5 A7 B1 B3 B5 B7 C1 C3 C5 C7 GND CNT1 CNT3 TMR1 GND GND ODN o Signal name ACH8 ACH1 AGND ACH10 AGND ACH4 AGND ACH13 ACH6 AGND ACH15 NC NC POSREF reserved for self calibration 5 AO A2 A4 A6 BO B2 B4 B6 CO C2 C4 C6 TTL TRG CNTO CNT2 TMRO XAPCR XDPCR 0858 2533 User s Guide Installing the USB 2533 68 pin SCSI connector pin out labeled P5 on the board 8 channel differential mode Signal name ACHO HI AGND ACH1 LO ACH HI AGND LO SGND ACH4 LO ACH5 AGND ACH6 LO ACH7 HI NC NC NEGREF reserved for self calibration GND A1 A3 A5 A7 B1 B3 B5 B7 C1 C3 C5 C7 GND CNT1 CNT3 TMR1 GND GND ODN Signal name ACHO LO ACH1 HI AGND ACH2 LO HI AGND ACH4 AGND ACH5 LO ACH6 HI AGND ACH7 LO NC NC POSREF reserved for self calibration 5 AO A2 A4 A6 BO B2 B4 B6 co C2 T
56. nnel This guarantees an analog trigger latency that is less than us You can select any analog channel as the trigger channel but the selected channel must be the first channel in the scan You can program the trigger level the rising or falling edge and hysteresis A note on the hardware analog level trigger and comparator change state When analog input voltage starts near the trigger level and you are performing a rising or falling hardware analog level trigger the analog level comparator may have already tripped before the sweep was enabled If this is the case the circuit waits for the comparator to change state However since the comparator has already changed state the circuit does not see the transition To resolve this problem do the following 1 Setthe analog level trigger to the threshold you want 2 Apply an analog input signal that 15 more than 2 5 of the full scale range away from the desired threshold This ensures that the comparator is in the proper state at the beginning of the acquisition 3 Bring the analog input signal toward the desired threshold When the input signal is at the threshold some tolerance the sweep will be triggered 4 Before re arming the trigger move the analog input signal to a level that is more than 2 5 of the full scale range away from the desired threshold For example if you are using the 2 V full scale range gain 5 and you want to trigger at 1 V on the rising edge
57. nter inputs while generating digital pattern outputs at the same time Digital and counter inputs do not affect the overall A D rate because these inputs use no time slot in the scanning sequencer For example one analog input channel can be scanned at the full 1 MHz A D rate along with digital and counter input channels Each analog channel can have a different gain and counter and digital channels do not need additional scanning bandwidth as long as there is at least one analog channel in the scan group Digital input channel sampling is not done during the dead time of the scan period where no analog sampling 15 being done either Analog input The USB 2533 has a 16 bit 1 MHz A D coupled with 64 single ended or 32 differential analog inputs Seven software programmable ranges provide inputs from 10 V to 100 mV full scale Analog input scanning The USB 2533 has several scanning modes to address various applications You can load the 512 location scan buffer with any combination of analog input channels analog input channels in the scan buffer are measured sequentially at 1 us per channel by default For example in the fastest mode with a us settling time for the acquisition of each channel a single analog channel can be scanned continuously at 1 MS s two analog channels can be scanned at 500 kS s each 16 analog input channels can be scanned at 62 5 kS s Settling time For most applications leave the settling time at
58. p n CA USB2 0 is used to connect the USB 2533 to a USB port on the host PC Four channel TC terminal pin out TB7 You can use the TB7 terminal block to connect up to four thermocouples The first TC channel uses ACHO analog channel 0 for its positive lead and ACHS for its negative lead The second TC channel uses ACHI and ACHO and so on as indicated in Figure 2 HOOL c HO OL LHO L 0 HO OL Figure 2 TC terminal pin out labeled TB7 18 USB 2533 User s Guide Installing the USB 2533 Cabling Use a CA 68 3R 68 pin ribbon expansion cable Figure 3 or a 68 35 3 foot or 68 65 6 foot 68 pin shielded expansion cable Figure 4 to connect signals to the USB 2533 s 68 pin SCSI connector The stripe identifies pin 1 Figure 3 CA 68 3R cable Figure 4 CA 68 3S and 68 65 cable Use one or more C40FF x ribbon cable s Figure 5 to connect signals to one or more of the USB 2533 s 40 pin header connectors The red stripe 2 identifies pin 1 40 39 40 pin Female 40 pin Female IDC Connector IDC Connector Figure 5 C40FF x cable 19 USB 2533 User s Guide Installing the USB 2533 Field wiring and signal termination You can use the following Measurement Computing screw terminal board to terminate field signals and route them into the USB 2533 board using the CA 68 3R CA 68 3S or CA 68 6S cable TB 100 Termination board
59. plete rotation of the encoder The concentric pattern for the Z signal has only one transparent window and therefore pulses only once per complete rotation Representative signals are shown in the following figure Qe DR n B Figure 19 Representation of quadrature encoder outputs A B and Z As the encoder rotates the or B signal indicates the distance the encoder has traveled The frequency of A or B indicates the velocity of rotation of the encoder If the Z signal is used to zero a counter that is clocked by A then that counter gives the number of pulses the encoder has rotated from its reference The Z signal is a reference marker for the encoder It should be noted that when the encoder is rotating clockwise as viewed from the back A will lead B and when the encoder is rotating counterclockwise A lags behind B If the counter direction control logic is such that the counter counts upward when A leads B and counts downward when A lags B then the counter gives direction control as well as distance from the reference Maximizing encoder accuracy If there are 512 pulses on A then the encoder position is accurate to within 360 512 You can get even greater accuracy by counting not only rising edges on A but also falling edges on giving position accuracy to 360 degrees 1024 You get maximum accuracy counting rising and falling edges on A and on B since B al
60. power supply sold separately when there is insufficient power from the USB port However you can use this power supply in any scenario 10 USB 2533 User s Guide Installing the USB 2533 Caution Avoid redundant connections Ensure there is no signal conflict between SCSI pins and the associated header pin J5 J8 Also make sure there is no conflict between theTB7 TC connections and the SCSI and or the 40 pin header connections Failure to do so could possibly cause equipment damage and or personal injury Also turn off power to all devices connected to the system before making connections Electrical shock or damage to equipment can result even under low voltage conditions Information on signal connections General information regarding signal connection and configuration is available in the Guide to Signal Connections This document is available on our web site at www mccdag com signals signals pdf Caution Always handle components carefully and never touch connector pins or circuit components unless you are following ESD guidelines in an appropriate ESD controlled area These guidelines include using properly grounded mats and wrist straps ESD bags and cartons and related procedures Avoid touching board surfaces and onboard components Only handle boards by their edges Make sure the USB 2533 does not come into contact with foreign elements such as oils water and industrial particulate discharge of st
61. roup latches the count so the count is updated each time a scan is started Gating on mode Sets the gating option to on for the mapped channel enabling the mapped channel to gate the counter Any counter can be gated by the mapped channel When the mapped channel is high the counter is enabled When the mapped channel is low the counter is disabled but holds the count value The mapped channel can be any counter input channel other than the counter being gated Decrement on mode Sets the counter decrement option to on for the mapped channel The input channel for the counter increments the counter and you can use the mapped channel to decrement the counter 32 USB 2533 User s Guide Functional Details Debounce modes Each channel s output can be debounced with 16 programmable debounce times from 500 ns to 25 5 ms The debounce circuitry eliminates switch induced transients typically associated with electro mechanical devices including relays proximity switches and encoders There are two debounce modes as well as a debounce bypass as shown in Figure 13 In addition the signal from the buffer can be inverted before it enters the debounce circuitry The inverter is used to make the input rising edge or falling edge sensitive Edge selection is available with or without debounce In this case the debounce time setting is ignored and the input signal goes straight from the inverter or inverter bypass to the counter
62. rs labeled J7 and J8 to connect digital ports counters timers triggers pacer clocks and other signals Digital channel GND A0 A1 A2 A3 GND BO B1 B2 B3 GND CO C1 C2 C3 GND TMRO CNTO CNT2 GND Pin c N Pin 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 Digital channel XAPCR A4 A5 A6 A7 TTL TRG B4 B5 B6 B7 5V C4 C5 C6 C7 TMR1 CNT1 CNT3 GND GND Signal 13 V NC AGND NC NC AGND SelfCal AGND TTL TRG XAPCR GND digital NC 5 Pin 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 USB 2533 40 pin header connectors pin out labeled J7 and J8 J8 Pin 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 Signal 13 V NC AGND NC NC AGND SGND AGND XDPCR GND digital GND digital NC AUX PWR NC NC NC NC NC NC NC 17 USB 2533 User s Guide Installing the USB 2533 Using CAOFF x cables to obtain 40 pin female connectors In this example a cable is connected to all of the 40 pin headers 75 76 J7 and J8 The result is four female 40 pin connectors that together have more signal connectivity than the SCSI connector 40 pin female 40FF x header cables USB cable Figure 1 Four C40FF x cables connected to J5 through J8 40 pin connectors In all scenarios a USB cable MCC
63. s capable of generating a different square wave with a programmable frequency in the range of 16 Hz to 1 MHz 5V Timer Generator 68 SCSI Connector 100 Q Figure 23 Typical USB 2533 timer channel Example Timer outputs Timer outputs are programmable square waves The period of the square wave can be as short as 1 us or as long as 65535 us Refer to the table below for examples of timer output frequencies Timer output frequency examples Divisor Timer output frequency 1 MHz 100 10 kHz 1000 1 kHz 10000 100 Hz 65535 15 259 Hz The two timer outputs can generate different square waves The timer outputs can be updated asynchronously at any time Using detection setpoints for output control What are detection setpoints With the USB 2533 s setpoint configuration feature you can configure up to 16 detection setpoints associated with channels in a scan group Each setpoint can update the following allowing for real time control based on acquisition data FIRSTPORTC digital output port with a data byte and mask byte timers 40 0858 2533 User s Guide Functional Details Setpoint configuration overview You can program each detection setpoint as one of the following Single point referenced Above below or equal to the defined setpoint Window dual point referenced Inside or outside the window Window dual point referenced hysteresis mode
64. setpoints limit A and limit B which define a window for that channel Channel Condition State of detect signal Action 4 Within window True When Channel 4 s analog input voltage is within the between limit A and window update FIRSTPORTC with 70h limit B for channel 4 False When the above stated condition is False channel 4 analog input voltage is outside the window update FIRSTPORTC with 30h 43 0858 2533 User s Guide Functional Details beeseeeceneneeeneneesesesesses sno en esesesesseseceseenen 32767 Limit A for channel 4 Limit B for channel 4 h i SC PEREP IRR S 0 Channel 4 input voltage i FIRSTPORTC Me 3 ie UE e 1 Detection signal for channel 4 Figure 25 Analog inputs with setpoints update on True and False You can program control outputs programmed on each setpoint and use the detection for channel 4 to update the FIRSTPORTC digital output port with one value 70 h in the example when the analog input voltage is within the shaded region and a different value when the analog input voltage is outside the shaded region 30 h in the example Detection on an analog input timer output updates Update Mode Update on True and False Criteria Used Inside window The figure below shows how a setpoint can be used to update a timer output Channel 3 is an analog input channel A setpoint is applied using update on True and False wi
65. so has 512 pulses This gives a position accuracy of 3607 2048 These different modes are known as X2 and X4 Connecting the USB 2533 to an encoder You can use up to two encoders with each USB 2533 in your acquisition system Each A and B signal can be made as a single ended connection with respect to common ground 37 0858 2533 User s Guide Functional Details Differential applications are not supported For single ended applications Connect signals A B and Z to the counter inputs on the USB 2533 Connect each encoder ground to GND You can also connect external pull up resistors to the USB 2533 counter input terminal blocks by placing a pull up resistor between any input channel and the encoder power supply Choose a pull up resistor value based on the encoder s output drive capability and the input impedance of the USB 2533 Lower values of pull up resistors cause less distortion but also cause the encoder s output driver to pull down with more current Connecting external pull up resistors to the USB 2533 For open collector outputs you can connect external pull up resistors to the USB 2533 s counter input terminal blocks You can place a pull up resistor between any input channel and the provided 5 V power supply Choose a pull up resistor value based on the encoder s output drive capability and the input impedance of the USB 2533 Lower values of pull up resistors cause less distortion but also cause the
66. specifications Number of I O 24 Ports Three banks of eight Each port is programmable as input or output Input scanning modes Two programmable Asynchronous under program control at any time relative to input scanning Synchronous with input scanning Input characteristics 220 Q series resistors 20 pF to common Logic keeper circuit Holds the logic value to 0 or 1 when there is no external driver Input protection 15 kV ESD clamp diodes parallel Input high 2 0 V to 5 0 V Input low 0 to 0 8 Output high gt 2 0 V Output low 0 8 V Output current Output 1 0 mA per pin sourcing more current may require a PS 9V1AEPS 2500 power supply option Digital input pacing Onboard clock external input scan clock XAPCR Digital output pacing Four programmable sources Onboard output scan clock independent of input scan clock Onboard input scan clock External output scan clock XDPCR independent of external input scan clock XAPCR External input scan clock XAPCR Digital input trigger sources and modes See Table 7 Digital output trigger sources Start of input scan Sampling update rate 4 MHz maximum rates up to 12 MHz are sustainable on some platforms Pattern generation output Two of the 8 bit ports can be configured for 16 bit pattern generation The pattern can also be updated synchronously with an acquisition at up
67. t port can be updated with the given byte and mask You can also program each setpoint a timer update value In hysteresis mode each setpoint has two forced update values Each update value can drive one timer or the FIRSTPORTC digital output port In hysteresis mode the outputs do not change when the input values are inside the window There is one update value that gets applied when the input values are less than the window and a different update value that gets applied when the input values are greater than the window Update on True and False uses two update values The update values can drive FIRSTPORTC or timer outputs FIRSTPORTC digital outputs can be updated immediately upon setpoint detection FIRSTPORTC or timer update latency Setpoints allow timers or FIRSTPORTC digital outputs to update very quickly Exactly how fast an output can update is determined by these factors scan rate synchronous sampling mode type of output to be updated For example you set an acquisition to have a scan rate of 100 kHz which means each scan period is 10 us Within the scan period you sample six analog input channels These are shown in the following figure as channels 1 through 6 The ADC conversion occurs at the beginning of each channel s 1 us time block 46 0858 2533 User s Guide Functional Details 1 1 2 3 4 5 6 1T 2 3 4 5 6 es li Start of Scan Start
68. th a criteria of inside the window where the signal value is inside the window when simultaneously less than Limit A but greater than Limit B Whenever the channel 3 analog input voltage is inside the setpoint window condition True TimerO is updated with one value and whenever the channel 3 analog input voltage is outside the setpoint window condition False timerO will be updated with a second output value Limit channel 3 Channel 3 analog input voltage Limit B for channel 3 Detection signal Figure 26 Timer output update on True False 44 USB 2533 User s Guide Functional Details Using the hysteresis function Update mode N A the hysteresis option has a forced update built into the function Criteria used Window criteria for above and below the set limits The figure below shows analog input Channel 3 with a setpoint which defines two 16 bit limits Limit A High and Limit B Low These are being applied in the hysteresis mode and FIRSTPORTC is updated accordingly In this example Channel 3 s analog input voltage is being used to update FIRSTPORTC as follows When outside the window low below limit B FIRSTPORTC is updated with 30 h This update remains in effect until the analog input voltage goes above Limit A When outside the window high above limit A FIRSTPORTC is updated with 30 h This update remains in effect until the analog input signal falls below limit
69. th electro mechanical devices like encoders and mechanical switches to reject switch bounce and disturbances due to a vibrating encoder that is not otherwise moving The debounce time should be set short enough to accept the desired input pulse but longer than the period of the undesired disturbance as shown in Figure 18 35 0858 2533 User s Guide Functional Details Debounce Time 1 Trigger Before Stable f l Trigger After Stable Figure 18 Optimal debounce time for trigger after stable mode Encoder mode Rotary shaft encoders are frequently used with CNC equipment metal working machines packaging equipment elevators valve control systems and in a multitude of other applications in which rotary shafts are involved The encoder mode allows the USB 2533 to make use of data from optical incremental quadrature encoders In encoder mode the USB 2533 accepts single ended inputs When reading phase A phase B and index Z signals the USB 2533 provides positioning direction and velocity data The USB 2533 can receive input from up to two encoders The USB 2533 supports quadrature encoders with a 16 bit counter low or a 32 bit counter high counter 20 MHz frequency and X1 X2 and X4 count modes With only phase A and phase B signals two channels are supported with phase phase B and index Z signals channel is supported Each input can be debounced from 500 ns to 25 5 ms total of 16 selections to
70. the board is first powered on there is usually a momentary delay before the power LED begins to blink or come on solid Connect external power if used before connecting the USB cable to the computer If you are using a PS 9V1 AEPS 2500 power supply connect the external power cable to the USB 2533 before connecting the USB cable to the computer This allows the USB 2533 to inform the host computer when the USB cable is connected that the board requires minimal power from the computer s USB port In general all standoffs should be used to mount the board to a metal frame The standoff at this location The standoff at this location connects to the USB connects to the USB 4 533 s internal chassis chassis for shunting plane for shunting electrostatic discharge electrostatic discharae Caution Do not disconnect any device from the USB bus while the computer is communicating with the USB 2533 or you may lose data and or your ability to communicate with the USB 2533 Configuring the hardware hardware configuration options on the USB 2533 are software controlled You can select some of the configuration options using InstaCal such as the analog input configuration 64 single ended or 32 differential channels and the edge used for pacing when using an external clock Once selected any program that uses the Universal Library initializes the hardware according to these selections You need a PS 9V AEPS 2500
71. to 4 MHz 51 USB 2533 User s Guide Specifications Counters Counter inputs can be scanned based on an internal programmable timer or an external clock source Table 5 Counter specifications Channels Four independent Resolution 32 bit Input frequency 20 MHz maximum Input signal range 5 V to 10 V Input characteristics 10 pull up 15 kV ESD protection Trigger level TTL Minimum pulse width 25 ns high 25 ns low De bounce times 16 selections from 500 ns to 25 5 ms positive or negative edge sensitive glitch detect mode or de bounce mode Time base accuracy 50 ppm 0 to 50 C Counter read pacer Onboard input scan clock external input scan clock XAPCR Trigger sources and modes See Table 7 Programmable mode Counter Counter mode options Totalize clear on read rollover stop at all Fs 16 bit or 32 bit any other channel can gate the counter Input sequencer Analog digital and counter inputs can be scanned based on either an internal programmable timer or an external clock source Table 6 Input sequencer specifications Scan clock sources two see Note 4 Internal Analog channels from 1 us to 1 sec in 20 83 ns steps Digital channels and counters from 250 ns to 1 sec in 20 83 ns steps External TTL level input XAPCR Analog channels down to 1 us minimum Digital channels and counters down to 250 ns min
72. to the terms and conditions of sale Harsh Environment Program Any Measurement Computing product that is damaged due to misuse or any reason may be eligible for replacement with the same or similar device for 50 of the current list price I O boards face some harsh environments some harsher than the boards are designed to withstand Contact MCC to determine your product s eligibility for this program 30 Day Money Back Guarantee Any Measurement Computing Corporation product may be returned within 30 days of purchase for a full refund of the price paid for the product being returned If you are not satisfied or chose the wrong product by mistake you do not have to keep it These warranties are in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular application The remedies provided herein are the buyer s sole and exclusive remedies Neither Measurement Computing Corporation nor its employees shall be liable for any direct or indirect special incidental or consequential damage arising from the use of its products even if Measurement Computing Corporation has been notified in advance of the possibility of such damages Trademark and Copyright Information TracerDAQ Universal Library Measurement Computing Corporation and the Measurement Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation Windows Microsoft and Vis
73. tor Although the USB 2533 is powered by a USB port on a host PC an external power connector is available when the host PC s USB port cannot supply adequate power or if you prefer to use a separate power source Connect the optional PS 9V 1 AEPS 2500 power supply to the external power supply connector This power supply plugs into a standard 120 VAC outlet and supplies 9 VDC 1 A power to the USB 2533 22 0858 2533 User s Guide Functional Details USB 2533 block diagram Figure 7 is a simplified block diagram of the USB 2533 This board provides all of the functional elements shown in the figure 32 DI 64 SE Prog Gain analog input amplifier Analog channel input protection One TTL trigger input 512 step one analog random access input pacer clock channel gain sequencer Sequencer reset timer outputs Programmable sequencer timebase Four 32 bit 1us to 6 hours counter inputs um Three 8 bit digital ports controller USB controller Configurable Configurable PLD EEPROM Connect the optional power supply and up to 16 analog inputs are PS 9V1AEPS 2500 Pins for all DIO counters timers also on the SCSI connector if the USB cannot supply enough power Figure 7 USB 2533 functional block diagram 23 USB 2533 User s Guide Functional Details Synchronous I O mixing analog digital and counter scanning The USB 2533 can read analog digital and cou
74. ual Studio are either trademarks or registered trademarks of Microsoft Corporation LabVIEW is a trademark of National Instruments CompactFlash is a registered trademark of SanDisk Corporation XBee and XBee PRO are trademarks of MaxStream Inc other trademarks are the property of their respective owners Information furnished by Measurement Computing Corporation is believed to be accurate and reliable However no responsibility is assumed by Measurement Computing Corporation neither for its use nor for any infringements of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or copyrights of Measurement Computing Corporation All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form by any means electronic mechanical by photocopying recording or otherwise without the prior written permission of Measurement Computing Corporation Notice Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and or devices without prior written consent from Measurement Computing Corporation Life support devices systems are devices or systems which a are intended for surgical implantation into the body or b support or sustain life and whose failure to perform can be reasonably expected to result in injury Measurement
75. ut 20 tolerance 2m A USB powered 10mA using external power 40 pin header connector pin outs 40 39 This edge of the header is closest to the center of the USB 2533 Pins 2 and 40 are labeled on the board silkscreen 56 0858 2533 User s Guide Specifications J5 Table 17 40 pin header connector pinout labeled J5 on the board 64 channel single ended mode Pin Function Pin Function 27 2 ACH19 3 ACH26 4 ACH18 5 AGND 6 AGND 7 8 ACH11 9 ACH2 10 ACH10 11 ACH17 12 ACH25 13 ACH16 14 ACH24 15 ACH1 16 ACH9 17 ACHO 18 ACH8 19 AGND 20 AGND 21 ACH23 22 ACH31 23 ACH22 24 ACH30 25 ACH7 26 ACH15 27 ACH6 28 ACH14 29 AGND 30 ACH21 31 ACH29 32 ACH20 33 ACH28 34 5 35 ACH13 36 ACH4 37 ACH12 38 AGND 39 AGND 40 AGND Table 18 40 pin header connector pinout labeled J5 on the board 32 channel differential mode Pin Function Pin Function 1 ACH11 LO 2 ACH11 HI 3 ACH10 LO 4 ACH10 HI 5 AGND 6 AGND 7 ACH HI 8 ACH3 LO 9 ACH2 HI 10 ACH2 LO 11 HI 12 ACH9 LO 13 ACH8 HI 14 ACH8 LO 15 HI 16 ACH1 LO 17 HI 18 ACHO LO 19 AGND 20 AGND 21 15 22 ACH15 LO 23 ACH14 HI 24 ACH14 LO 25 ACH7 HI 26 ACH7 LO 27 ACH6 HI 28 ACH6 LO 29 AGND 30 31 ACH13LO 32 ACH12 HI 33 ACH12LO 34 ACH5 HI 35 ACH5 LO 36 ACH4 HI 37 ACH4 LO 38 AGND 39
76. with screw terminals A 19 inch rack mount kit RM TB 100 for the TB 100 termination board is also available You can use the following screw terminal board with the C40FF x cable CIO MINI40 40 pin screw terminal board Details on these products are available on our web site Using multiple USB 2533s per PC USB 2533 features can be replicated up to four times as up to four devices can be connected a single host PC The serial number on each USB 2533 distinguishes one from another You can operate multiple USB 2533 boards synchronously To do this set up one USB 2533 with the pacer pin you want to use XAPCR or XDPCR configured for output Set up the USB 2533 boards you want to synchronize to this board with the pacer pin you want to use XAPCR or XDPCR configured for input Wire the pacer pin configured for output to each of the pacer input pins that you want to synchronize 20 Chapter 3 Functional Details This chapter contains detailed information on all of the features available from the board including adiagram and explanations of physical board components afunctional block diagram information on how to use the signals generated by the board diagrams of signals using default or conventional board settings USB 2533 components These USB 2533 components are shown in Figure 6 One USB port One external power connector One 68 pin SCSI connector Four 40 pin headers 75 J6 77 and J8 On

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