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National Instruments DAQCard-1200 Network Card User Manual

1. GATEB2 CLKB2 GATEB2 h General Purpose CLKB2 gt Counter A OUTB2 OUTB2 imo 1 MHz Source GATEB1 m GATEB1 aa CLKB1 MUX Scan MUX Interval ii General Purpose CLKB1 OANIO Counter OUTB1 lt _ OUTB1 OUTBO CIRAD lt OUTBO GaTeBo GateBo CTR WAIL Data Timebase 8 Extension General 2 Purpose y 3 Counter __ CLKAO O 5 2 MHz o Q Source CLKBO m GATEAO 8 c 5 O c 82C53 Counter Timer Qa 8 Group B Sample O Interval S Counter OUTB1 OUTAO EXTCONV gt CLKA1 i y Sample A D Conversion Logic Counter f i gt GATEA1 EXTTRIG OUTA1 5V _ CLKA2 LM GATEA2 EXTUPDATE DAC Timing D A Conversion Logic lt d _ OUTA2 82C53 Counter Timer Group A Figure 4 3 Timing Circuitry DAQCard 1200 User Manual 4 4 National Instruments Corporation Chapter 4 Theory of Operation Each 82C53 contains three independent 16 bit counter timers and one 8 bit Mode Register Each counter has a CLK input pin a GATE input pin and an OUT output pin You can program all three counter timers to operate in several useful timing modes The first group of counter timers is called Group A and includes AO A1 and A2 You can use these three counters for internal data acquisition and DAC timing or you can instead use the three external timing signals EXTCONV EXTTRIG and
2. Address Bus Address Regi l p Dekoder B Register Selects Timing Interface B Read and Write Signals Control Lines Card m Information lt q Structure ag Dain Bus _ Data Yj internal Data Bus Buffers lt PCMCIA _ Control Registers ge _ _ Interrupt lt Interrupt Requests Control DAQCard 1200 User Manual Figure 4 2 PC Card 1 0 Interface Circuitry Block Diagram 4 2 National Instruments Corporation Timing Chapter 4 Theory of Operation When you first insert the card into your computer the system examines information stored in the DAQCard 1200 Card Information Structure CIS This data is used to configure the card appropriately for the system in which it is used When the system has assigned the card to a section of memory it updates the PC Card control registers and initializes the card The rest of the circuitry consists of address decoders data buffers T O channel interface timing control circuitry and interrupt control circuitry The DAQCard 1200 uses two 82C53 counter timer integrated circuits for internal data acquisition and DAC timing and for general purpose T O timing functions Figure 4 3 shows a block diagram of both groups of timing circuitry counter groups A and B National Instruments Corporation 4 3 DAQCard 1200 User Manual Chapter 4 Theory of Operation
3. gt j Dither data 2K 12 Bit Pgm Input PCMCIA gt ae lt _ gt O 8 8 FIFO A D Gain 4 Mux Channel K Interface Decode I ia 4 j p Circuitry Control Core Signals Logic A gt Calibration 3 T i E E lt O y 2 O A 1 PT 12 Bit 82C53 82C55A o _ gt D A O S L Ctr Timer Digital E S Group A Interface a Interrupt Interface _ P 8 a 12 Bit D A p 12V lt gt sv pone ies Curtin 3 E Timeb r Timer gt Converter b merase p Group B Time 2 MHz 20 MHz Divider Timebase Oscillator National Instruments Corporation Figure 4 1 DAQCard 1200 Block Diagram 4 1 DAQCard 1200 User Manual Chapter 4 Theory of Operation The major components of the DAQCard 1200 are as follows PC Card I O channel interface circuitry Analog input circuitry Analog output circuitry Digital I O circuitry Timing circuitry Calibration circuitry The internal data and control buses interconnect the components The rest of the chapter explains the theory of operation of each of the DAQCard 1200 components PC Card 1 0 Channel Interface Circuitry The PC Card I O channel interface circuitry consists of an address bus a data bus interrupt lines and several control and support signals Figure 4 2 shows the components making up the DAQCard 1200 PC Card I O channel interface circuitry PCMCIA I O Channel
4. Figure 4 5 Analog Output Circuitry Analog Output Circuitry Each analog output channel contains a 12 bit DAC The DAC in each analog output channel generates a voltage proportional to the 5 V reference provided in the Dual DAC chip multiplied by the 12 bit digital code loaded into the DAC The voltage output from the two DACs is available at the DAQCard 1200 I O connector DACOOUT and DACIOUT pins You can program each DAC channel for a unipolar voltage output or a bipolar voltage output range A unipolar output gives an output voltage range of 0 to 10 V A bipolar output gives an output voltage range of 5 V For unipolar output 0 V output corresponds to a digital code word of 0 For bipolar output 5 V output corresponds to a digital code word of F800 hex One LSB is the voltage increment corresponding to an LSB change in the digital code word For both outputs 10 V National Instruments Corporation 4 11 DAQCard 1200 User Manual Chapter 4 Theory of Operation Power On State Both analog outputs reach 0 V approximately 110 ms after card insertion During this 110 ms period the output voltage can swing from 2 to 5 V hp Warning Disconnect the analog outputs from the system before inserting the card in the PC Card slot This step ensures that you do not damage your system during the 110 ms before the output reaches 0 V DAC Timing There are two ways you can update the DAC voltages In the
5. Figure 3 17 Event Counting Application with External Switch Gating National Instruments Corporation 3 27 DAQCard 1200 User Manual Chapter 3 Signal Connections DAQCard 1200 User Manual Pulsewidth measurement is performed by level gating The pulse you want to measure is applied to the counter GATE input The counter is loaded with the known count and is programmed to count down while the signal at the GATE input is high The pulse width equals the counter difference loaded value minus read value multiplied by the CLK period Perform time lapse measurement by programming a counter to be edge gated An edge is applied to the counter GATE input to start the counter You can program the counter to start counting after receiving a low to high edge The time lapse since receiving the edge equals the counter value difference loaded value minus read value multiplied by the CLK period To perform frequency measurement program a counter to be level gated and count the number of falling edges in a signal applied to a CLK input The gate signal applied to the counter GATE input is of known duration In this case you program the counter to count falling edges at the CLK input while the gate is applied The frequency of the input signal then equals the count value divided by the gate period Figure 3 18 shows the connections for a frequency measurement application You can also use a second counter to generate the gate signal in this a
6. Figure 1 1 The Relationship between the Programming Environment NI DAQ and Your Hardware Register Level Programming The final option for programming any National Instruments DAQ hardware is to write register level software Writing register level programming software can be very time consuming and inefficient and is not recommended Even if you are an experienced register level programmer consider using NI DAQ LabVIEW or LabWindows CVI to program your National Instruments DAQ hardware Using the NI DAQ LabVIEW or LabWindows CVI software is as easy and as flexible as register level programming and can save weeks of development time DAQCard 1200 User Manual 1 4 National Instruments Corporation Chapter 1 Introduction Optional Equipment You can use the following National Instruments products with your DAQCard 1200 BNC 2081 CB 50 or CB 50LP I O connector block with a 0 5 or 1 0 m cable ER 8 ER 16 electromechanical relays PR50 50F or PR50 50M cables SC 2042 SC 2043 strain gauge and RTD accessories SCXI products For more information about optional equipment available from National Instruments refer to your National Instruments catalog or call the office nearest you Unpacking The DAQCard 1200 is shipped in an antistatic vinyl envelope when you are not using the DAQCard 1200 store it in this envelope Because the DAQCard 1200 is enclosed in a fully shielded case no additional electrostatic pre
7. Because both pretrigger and posttrigger modes use EXTTRIG input you can only use one mode at a time For interval scanning data acquisition counter B1 determines the scan interval Instead of using counter B1 you can externally time the scan interval through OUTB1 If you externally time the sample interval you should also externally time the scan interval Figure 3 15 shows an example of a multiple channel interval scanning data acquisition operation The scan interval and the sample interval are being timed externally through OUTB1 and EXTCONV Channels 1 and 0 of the input multiplexers are being scanned once during each scan interval The first rising edge of EXTCONV must occur a minimum of 50 ns after the rising edge on OUTB1 The first rising edge of EXTCONV after the rising edge of OUTB1 enables an internal GATE signal that allows conversions to occur The first conversion then occurs on the following falling edge of EXTCONV DAQCard 1200 User Manual 3 24 National Instruments Corporation Chapter 3 Signal Connections OUTB1 ee AE AE NP AP MP PP AN CONVERT GATE ADC CH gt lt tw 50 ns V PS tq 50 ns 4 tt T Doo T L CH1 cro CH1 CHO Figure 3 15 Interval Scanning Signal Timing Use the final external control signal EXTUPDATE to externally control updating the output voltage of the 12 bit DACs and or to generate an externally timed interrup
8. 150 All timing values are in nanoseconds Figure 3 11 Mode 2 Timing Specifications for Bidirectional Transfers National Instruments Corporation DAQCard 1200 User Manual Chapter 3 Signal Connections DAQ and General Purpose Timing Signal Connections Pins 38 through 48 of the front connector are connections for timing T O signals The DAQCard 1200 timing I O uses two 82C53 counter timer integrated circuits One circuit designated 82C53 A is used exclusively for DAQ timing and the other 82C53 B is available for general use You can use pins 38 through 40 and pin 43 to carry external signals for DAQ timing in place of the dedicated 82C53 A These signals are explained in the next section DAQ Timing Connections Pins 41 through 48 carry general purpose timing signals from 82C53 B These signals are explained in the General Purpose Timing Signal Connections section later in this chapter DAQ Timing Connections Each 82C53 counter timer circuit contains three counters Counter 0 on the 82C53 A counter timer referred to as AO is a sample interval counter in timed A D conversions Counter 1 on the 82C53 A counter timer referred to as Al is a sample counter in controlled A D conversions Therefore counter Al stops data acquisition after a predefined number of samples These counters are not available for general use Instead of counter AO you can use EXTCONV to externally time conversions Figure 3 12 shows the
9. Compatibility Power on state National Instruments Corporation A 5 Appendix A Specifications 0 10 V 5 V software selectable DC 0 5 Q typ 1 mA max per channel 80 mA momentary short circuit protection to ground 2 V to 5 V 0 V mV 20 us to 1 LSB accuracy 400 uVrms typ DC to 1 MHz 50 uV C 30 ppm C 24 I O three 8 bit ports uses the 82C55A PPI TTL All ports high impedance inputs DAQCara 1200 User Manual Appendix A Specifications Digital logic levels Level Min Max Input low voltage 0 3 V 0 8 V Input high voltage 2 2 V 5 3 V Output low voltage out 2 5 mA 0 4 V Output high voltage out 40 WA 4 2 V out 2 5 mA 3 7 V Output leakage current 0 lt Vout Vec 10 uA 10 yA Protection Jesencesevsencs deb sssevedeeoseedt essen 0 5 to 5 5 V powered on 0 5 V powered off Handshaking 0 00 eee eeeeeeeeeeereeeee eee 3 wire 2 port Data transfers cniri esens Interrupts programmed I O Timing 1 0 Number of channels eeecesseeseeeeee 3 counters timers Digital logic levels Level Min Max Input low voltage 0 3 V 0 8 V Input high voltage 2 2 V 5 3 V Output low voltage Mout 4 mA 0 45 V Output high voltage out 1 mA 3 7 V DAQCard 1200 User Manual A 6 National Instruments Corporation Protection Resolution Counters timers Compatibility
10. 3 3 to 3 4 signal descriptions 3 3 to 3 4 single ended connections floating signal sources RSE configuration 3 11 to 3 12 ground referenced signal sources NRSE configuration 3 12 to 3 13 when to use 3 11 National Instruments Corporation l 7 Index software programming choices 1 2 to 1 4 LabVIEW and LabWindows CVI 1 3 NI DAQ driver software 1 3 to 1 4 register level programming 1 4 software related resources E 2 specifications analog input A 1 to A 4 amplifier characteristics A 2 to A 3 dynamic characteristics A 3 input characteristics A 1 to A 2 stability A 4 transfer characteristics A 2 analog output A 4 to A 5 dynamic characteristics A 5 output characteristics A 4 stability A 5 transfer characteristics A 4 voltage output A 5 bus interface A 7 digital I O A 5 to A 6 environment A 8 physical A 7 power requirements A 7 timing I O A 6 to A 7 square wave generation 3 27 stability analog input specifications A 4 analog output specifications A 5 STB signal table 3 18 T technical support resources E 1 to E 2 theory of operation analog input 4 5 to 4 8 circuitry 4 6 to 4 8 data acquisition rates 4 9 to 4 10 data acquisition timing 4 8 to 4 9 DAQCard 1200 User Manual Index analog output 4 11 to 4 12 transfer characteristics circuitry 4 11 analog input specifications A 2 DAC timing 4 12 analog output specifications A 4 power on state 4 12 block diagram of
11. Chapter 4 Theory of Operation can scan any number of channels from eight to two Notice that the same gain setting is used for all channels in the scan sequence The programmable gain amplifier applies gain to the input signal allowing an analog input signal to be amplified before being sampled and converted thus increasing measurement resolution and accuracy The instrumentation amplifier gain is software selectable The DAQCard 1200 provides gains of 1 2 5 10 20 50 and 100 The dither circuitry when enabled adds approximately 0 5 LSB rms of white Gaussian noise to the signal to be converted to the ADC This addition is useful for applications involving averaging to increase the resolution of the DAQCard 1200 to more than 12 bits as in calibration In such applications which are often lower frequency in nature noise modulation is decreased and differential linearity is improved by the addition of the dither For high speed 12 bit applications not involving averaging dither should be disabled because it only adds noise When taking DC measurements such as when calibrating the board enable dither and average about 1 000 points to take a single reading This process removes the effects of 12 bit quantization and reduces measurement noise resulting in improved resolution Dither or additive white noise has the effect of forcing quantization noise to become a zero mean random variable rather than a deterministic function of input
12. Base clocks available Appendix A Specifications 0 5 to 5 5 V powered on 0 5 V powered off 16 bits TTL 2 MHz Base clock accuracy sees ese eeeeees 50 ppm max Max source frequency Min source pulse duration Min gate pulse duration Data transfers Digital Trigger Compatibility Response Pulse width Bus Interface Slave Power Requirement 5 VDC 45 Physical 150 mA operating 50 mA power down mode plus any current drawn through the I O connector 5 line DiMeNnsiONS e eee eect ceee cee eneceseeeeeee 8 56 by 5 40 cm 3 37 by 2 13 in PC Card type I O connector National Instruments Corporation A 7 DAQCara 1200 User Manual Appendix A Specifications Environment Operating temperature 00 ee 0 to 50 C Storage temperature 0 eee eee 55 to 150 C Relative humidity 0 eee 5 to 90 noncondensing DAQCard 1200 User Manual A 8 National Instruments Corporation Differences among the Lab PC the DAQPad 1200 and the DAQCard 1200 This appendix contains a summary of the functional differences among the Lab PC the DAQPad 1200 and the DAQCard 1200 The Lab PC is a plug in DAQ board for PCs It has jumpers for allocating of bus resources such as base address interrupt and DMA channels as well as analog input output resources such as input output mode and polarity It also has potentiometers for calibration The DAQPad 1200 is a DAQ device that plu
13. EXTUPDATE signal data acquisition timing 3 25 to 3 26 description table 3 3 maximum voltage input rating 3 26 updating DAC output figure 3 26 DAQCard 1200 User Manual 1 4 F floating signal sources differential connections 3 9 to 3 10 purpose and use 3 6 single ended connections RSE configuration 3 11 to 3 12 frequency measurement general purpose timing signal connections 3 28 illustration 3 29 G GATBO signal table 3 3 GATB1 signal table 3 3 GATB2 signal table 3 4 GATE signals general purpose timing signal connections 3 26 to 3 30 timing requirements signals figure 3 30 general purpose timing signal connections See also data acquisition timing connections event counting 3 27 frequency measurement 3 28 GATE CLK and OUT signals 3 26 to 3 30 pins 3 22 pulse generation 3 27 pulsewidth measurement 3 28 square wave generation 3 27 time lapse measurement 3 28 timing requirements for GATE CLK and OUT signals figure 3 30 ground referenced signal sources differential connections 3 8 to 3 9 purpose and use 3 6 to 3 7 recommended input configurations table 3 7 single ended connections NRSE configuration 3 12 to 3 13 National Instruments Corporation IBF signal table 3 18 input configurations differential connection considerations 3 7 to 3 8 floating signal sources differential connections 3 9 to 3 10 recommended input configurations table 3 7 ground referen
14. For more information on the effects of dither see Dither in Digital Audio Journal of the Audio Engineering Society The DAQCard 1200 uses a 12 bit successive approximation ADC The 12 bit resolution of the converter allows the converter to resolve its input range into 4 096 different steps The ADC has an input range of 5 V and 0 to 10 V When an A D conversion is complete the ADC clocks the result into the A D FIFO This FIFO serves as a buffer to the ADC The A D FIFO can collect up to 1 024 A D conversion values before any information is lost thus allowing software some extra time to catch up with the hardware If you store more than 1 024 samples in the A D FIFO before reading from the A D FIFO an error condition called A D FIFO overflow occurs and you lose A D conversion information The output from the ADC can be interpreted as either straight binary or two s complement depending on which input mode you select unipolar or bipolar In unipolar mode the data from the ADC is interpreted as a 12 bit straight binary number with a range of 0 to 4 095 In bipolar mode the data from the ADC is interpreted as a 12 bit two s complement number National Instruments Corporation 4 7 DAQCard 1200 User Manual Chapter 4 Theory of Operation with a range of 2 048 to 2 047 In this mode the MSB of the ADC result is modified to make it two s complement The output from the ADC is then sign extended to 16 bits causing eith
15. 30 pins 3 22 power connections 3 31 DAQ timing connections See data acquisition timing connections DAQCard 1200 block diagram 4 1 configuration See configuration differences between Lab PC DAQPad 1200 and DAQCard 1200 B 1 to B 2 installation 2 1 optional equipment 1 5 overview and features 1 1 to 1 2 power management modes C 1 to C 2 requirements for getting started 1 2 software programming choices 1 2 to 1 4 LabVIEW and LabWindows CVI application software 1 3 NI DAQ driver software 1 3 to 1 4 register level programming 1 4 theory of operation See theory of operation unpacking 1 5 DAQPad 1200 compared with Lab PC and DAQCard 1200 B 1 to B 2 data acquisition rates 4 9 to 4 10 maximum recommended rates table 4 10 settling time vs gain table 4 10 data acquisition timing circuitry 4 8 to 4 9 continuous data acquisition 4 8 National Instruments Corporation l 3 Index data acquisition operation 4 8 interval data acquisition 4 9 data acquisition timing connections 3 22 to 3 26 See also general purpose timing signal connections EXTCONV signal 3 22 to 3 24 EXTTRIG signal 3 22 to 3 24 EXTUPDATE signal 3 25 to 3 26 interval scanning 3 24 multiple channel interval scanning figure 3 25 pins 3 22 posttrigger and pretrigger modes 3 23 posttrigger timing figure 3 23 pretrigger timing figure 3 24 sample counter 3 22 sample interval counter 3 22 waveform generation timing s
16. 8 single ended 8 pseudodifferential or 4 differential software selectable ReSOlUHONY ve sciscteteicdcetedekticsets 12 bits 1 in 4 096 Max single channel sampling rate 100 kS s Input signal ranges Board ain Eea See Software Selectable Unipolar Bipolar 1 Oto l0V 5 V 2 Oto5 V 2 5 V 5 0to2 V 1 V 10 Otol V 500 mV 20 0 to 500 mV 250 mV 50 0 to 250 mV 100 mV 100 0 to 100 mV 50 mV Input coupling eee eee eeeeeeeneeeeee DC Type of ADG eripiet Successive approximation National Instruments Corporation A 1 DAQCard 1200 User Manual Appendix A Specifications DAQCard 1200 User Manual Maximum working voltage signal common Mode eeeeeeeeeee Negative input AISENSE should remain within 6 V bipolar or 6 to 2 V unipolar of AGND Overvoltage protection eee 35 V powered on and 25 V powered off Inputs protected oe eee eeeeeeeeeees lt ACHO0 ACH7 gt FIFO buffer Size ee eee eeeeee eres 1 024 samples Data transfers ceeeesseeeneeceteeeneeeenees Interrupts programmed I O Dither cies a aeaaea Eii Available Transfer Characteristics Relative aCCUracy ssseeeseseeeeesreereerereeee 0 5 LSB typ dithered 1 5 LSB max undithered PND eerren ne oee E S 1 LSB max No missing COdES eseeeeeeseeeeneeeeeeeees 12 bits guaranteed Offset error Pre gain error after calibration 10 uV max Pre gain error before ca
17. CONTROL DEVICES TRANSIENT FAILURES OF ELECTRONIC SYSTEMS HARDWARE AND OR SOFTWARE UNANTICIPATED USES OR MISUSES OR ERRORS ON THE PART OF THE USER OR APPLICATIONS DESIGNER ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER COLLECTIVELY TERMED SYSTEM FAILURES ANY APPLICATION WHERE A SYSTEM FAILURE WOULD CREATE A RISK OF HARM TO PROPERTY OR PERSONS INCLUDING THE RISK OF BODILY INJURY AND DEATH SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM FAILURE TO AVOID DAMAGE INJURY OR DEATH THE USER OR APPLICATION DESIGNER MUST TAKE REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES INCLUDING BUT NOT LIMITED TO BACK UP OR SHUT DOWN MECHANISMS BECAUSE EACH END USER SYSTEM IS CUSTOMIZED AND DIFFERS FROM NATIONAL INSTRUMENTS TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS THE USER OR APPLICATION DESIGNER IS ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE SUITABILITY OF NATIONAL INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A SYSTEM OR APPLICATION INCLUDING WITHOUT LIMITATION THE APPROPRIATE DESIGN PROCESS AND SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION Contents About This Manual Organization of This Manual 00 0 cece eeeceseeeeecseeeseceesaeceeceaecseceseeseceseseseeeeeeseaseneeeaes ix Conventions Use
18. DAQCard 1200 4 1 digital I O 4 13 U functional overview 4 1 to 4 2 unpacking the DAQCard 1200 1 5 PC card I O channel interface circuitry 4 2 to 4 3 V timing 4 3 to 4 5 time lapse measurement 3 28 voltage output specifications A 5 timing circuitry illustration 4 4 W theory of operation 4 3 to 4 5 timing I O specifications A 6 to A 7 timing signal connections See data acquisition timing connections general purpose timing signal connections timing specifications digital I O 3 18 to 3 21 mode input timing 3 19 mode 1 output timing 3 20 mode 2 bidirectional timing 3 20 to 3 21 Web support from National Instruments E 1 to E 2 online problem solving and diagnostic resources E 1 software related resources E 2 Worldwide technical support E 2 WRI signal table 3 18 DAQCard 1200 User Manual l 8 National Instruments Corporation
19. Management Modes within 110 ms of card insertion until the first update is performed on that DAC Short circuit protected to 80 mA DC impedance 0 5 Q Normal Mode Power Down Mode Analog Functional Defaults to bipolar 5 V Nonfunctional Draws negligible power Input RSE Protected to 35 V Protected to 25 V Impedance 4 7 kQ Impedance gt 1 GQ which is the input protection resistance Analog Functional Defaults to bipolar 5 V Nonfunctional Draws negligible power Output RSE Output of each DAC remains at0 V Output of each DAC is ideally 0 V but may get some negligible value Short circuit protected to 80 mA Assume impedance 0 5 Q National Instruments Corporation C 1 DAQCara 1200 User Manual Appendix C Power Management Modes Table C 1 DAQCard 1200 Power Management Modes Continued Normal Mode Power Down Mode Calibration Functional Both analog input and Nonfunctional Draws negligible power Circuitry analog output can be fully calibrated 5 V supply is ideally zero but gets The CALDACs default to 0 V negligible voltage The CALDACs default to 0 V Calibration constants digital values written into the CALDAC are not preserved and must be rewritten after entering normal mode Digital I O Functional Defaults to high impedance Functional Defaults to high impedance inputs for all ports Protected from inputs for all ports A B and C 0 5 to 5 5 V Prot
20. Select o Mux Counter Q lt S o O a Dither 5 Dither _Oircuitry Dither Enable DAQ Counter Timer a External Trigger Timing A Signals e O a External Convert EXTCONV OUTB1 Output B1 Figure 4 4 Analog Input Circuitry Analog Input Circuitry DAQCard 1200 User Manual The analog input circuitry consists of two analog input multiplexers mux counter gain select circuitry a software programmable gain amplifier a 12 bit ADC and a 12 bit FIFO memory that is sign extended to 16 bits The two input multiplexers route the input channels to the instrumentation amplifier in either RSE NRSE or DIFF mode The input multiplexers provide input overvoltage protection of 35 V powered on and 25 V powered off The mux counters control the input multiplexers The DAQCard 1200 can perform either single channel data acquisition or multiple channel scanned data acquisition These two modes are software selectable For single channel data acquisition you select the channel and gain before initiating data acquisition These gain and multiplexer settings remain constant during the entire data acquisition process For multiple channel data acquisition you select the highest numbered channel and gain before data acquisition is initiated Then the mux counter decrements from the highest numbered channel to channel 0 and repeats the process Thus you 4 6 National Instruments Corporation
21. amplifier converts two input signals to a signal that is the difference between the two input signals multiplied by the gain setting of the amplifier The amplifier output voltage is referenced to the DAQCard 1200 ground The DAQCard 1200 ADC measures this output voltage when it performs A D conversions All signals must be referenced to ground either at the source device or at the DAQCard 1200 If you have a floating source you must use a ground referenced input connection at the DAQCard 1200 If you have a grounded source you must use a nonreferenced input connection at the DAQCard 1200 Types of Signal Sources When configuring the input mode of the DAQCard 1200 and making signal connections you must first determine whether the signal source is floating or ground referenced This section describes these two types of signals Floating Signal Sources A floating signal source is not connected in any way to the building ground system but has an isolated ground reference point Some examples of floating signal sources are outputs of transformers thermocouples battery powered devices optical isolator outputs and isolation amplifiers You must tie the ground reference of a floating signal to the DAQCard 1200 analog input ground to establish a local or onboard reference for the signal Otherwise the measured input signal varies or appears to float An instrument or device that supplies an isolated output falls into the floating signal so
22. connections For configuration instructions refer to the Analog Input Configuration section of Chapter 2 Installation and Configuration National Instruments Corporation 3 11 DAQCard 1200 User Manual Chapter 3 Signal Connections Floating Signal Source C Front I O Connector 1 ACH 0 oO 2 ACH 1 So 3 ACH 2 So e 8 ACH 7 So 9 AISENSE AIGND Measured Voltage 11 AGND iv DAQCard 1200 in RSE Configuration O DAQCard 1200 User Manual Figure 3 5 Single Ended Input Connections for Floating Signal Sources Single Ended Connections for Grounded Signal Sources NRSE Configuration If you measure a grounded signal source with a single ended configuration you must configure the DAQCard 1200 in the NRSE input configuration The signal is connected to the positive input of the DAQCard 1200 instrumentation amplifier and the signal local ground reference is connected to the negative input of the DAQCard 1200 instrumentation amplifier Therefore you must connect the ground point of the signal to the AISENSE pin Any potential difference between the DAQCard 1200 ground and the signal ground appears as a common mode signal at both the positive and negative inputs of the instrumentation amplifier and is therefore rejected by the amplifier On the other hand if the input circuitry of the DAQCard 1200 is referenced to ground such as in the RSE co
23. is one piece of the documentation set for your data acquisition system You could have any of several types of manuals depending on the hardware and software in your system Use the manuals you have as follows National Instruments Corporation Getting Started with SCXI If you are using SCXI this is the first manual you should read It gives an overview of the SCXI system and contains the most commonly needed information for the modules chassis and software Your SCXI user manuals If you are using SCXI read these manuals next for detailed information about signal connections and module configuration They also explain in greater detail how the module works and contain application hints Your DAQ board user manuals These manuals have detailed information about the DAQ hardware that plugs into or is connected to your computer Use these manuals for hardware installation and configuration instructions specification information about your DAQ hardware and application hints Software manuals Examples of software manuals you may have are the LabVIEW and LabWindows CVI manual sets and the NI DAQ manuals After you set up your hardware system use either the application software LabVIEW or LabWindows CVI manuals or the NI DAQ manuals to help you write your application If you have a large and complicated system it is worthwhile to look through the software manuals before you configure your hardware Accessory manuals If you
24. sample counter 3 22 sample interval counter 3 22 sampling rate note 4 10 signal connections analog input signal connections bipolar and unipolar signal range vs gain table 3 5 common mode signal rejection 3 13 to 3 14 differential connections 3 7 to 3 8 floating signal sources 3 9 to 3 10 grounded signal sources 3 8 to 3 9 single ended connections 3 11 to 3 13 when to use 3 8 exceeding maximum input voltage ratings warning 3 4 floating signal sources 3 6 ground referenced signal sources 3 6 to 3 7 input configurations 3 7 to 3 14 instrumentation amplifier 3 5 to 3 6 National Instruments Corporation pins 3 4 recommended input configurations table 3 7 single ended connections floating signal sources RSE configuration 3 11 to 3 12 grounded signal sources NRSE configuration 3 12 to 3 13 when to use 3 11 types of signal sources 3 6 to 3 7 analog output signal connections 3 14 DAQ and general purpose timing signal connections data acquisition timing connections 3 22 to 3 26 general purpose timing connections 3 26 to 3 30 pins 3 22 power connections 3 31 digital I O signal connections illustration 3 16 pins 3 15 Port C pin connections 3 17 timing specifications 3 18 to 3 21 mode input timing 3 19 mode 1 output timing 3 20 mode 2 bidirectional timing 3 20 to 3 21 T O connector exceeding maximum ratings warning 3 1 pin assignments figure 3 2 signal descriptions table
25. through noisy environments Differential signal connections reduce picked up noise and increase common mode signal and noise rejection With these connections input signals can float within the common mode limits of the input instrumentation amplifier Differential Connections for Grounded Signal Sources Figure 3 3 shows how to connect a ground referenced signal source to a DAQCard 1200 configured for DIFF input Refer to the Analog Input Configuration section in Chapter 2 Installation and Configuration for configuration instructions 3 8 National Instruments Corporation Chapter 3 Signal Connections Grounded Signal Source Front I O Connector ACH 1 o2 _ v Measured Voltage Common Mode 4 ACH3 P _ g Noise Ground 4 ol6 ACH5 so Potential Vem ACH 7 8 oo 11 AGND Vv DAQCard 1200 in DIFF Configuration Figure 3 3 Differential Input Connections for Grounded Signal Sources With this type of connection the instrumentation amplifier rejects both the common mode noise in the signal and the ground potential difference between the signal source and the DAQCard 1200 ground which is shown as Vom in Figure 3 3 Differential Connections for Floating Signal Sources Figure 3 4 shows how to connect a floating signal source to a DAQCard 1200 that is configured for DIFF input Configuration instructions are included in the An
26. to unplug it from the DAQCard 1200 The DAQCard 1200 is now installed You are ready to make the appropriate connections to the I O connector cable as described in Chapter 3 Signal Connections and to install and configure your software National Instruments Corporation 2 1 DAQCard 1200 User Manual Chapter 2 Installation and Configuration Figure 2 1 shows an example of a typical configuration Portable Computer PCMCIA Socket O Cable Figure 2 1 A Typical Configuration for the DAQCard 1200 Configuration The DAQCard 1200 is completely software configurable refer to your software manuals to install and configure your software If you are using NI DAQ refer to your NI DAQ user manual or function reference manual The software installation and configuration instructions are in Chapter 1 Find the installation and system configuration section for your operating system and follow the instructions given there If you are using LabVIEW you do not need the NI DAQ manuals the software installation instructions are in your LabVIEW release notes After you have installed LabVIEW refer to the Data Acquisition VXI and GPIB Installation Notes section of Chapter 1 Required Configuration Installation and Upgrade Information of your LabVIEW Version 5 1 Addendum for software configuration instructions DAQCard 1200 User Manual 2 2 National Instruments Corporation Chapter 2 Installation an
27. 12 795 8248 For telephone support outside the United States contact your local branch office Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 284 5011 Canada Calgary 403 274 9391 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Greece 30 1 42 96 427 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 Norway 32 27 73 00 Singapore 2265886 Spain Barcelona 93 582 0251 Spain Madrid 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2377 1200 United Kingdom 01635 523545 DAQCard 1200 User Manual E 2 National Instruments Corporation Glossary Prefix Meanings Value p pico 10 712 n nano 10 u micro 10 6 m milli 10 3 k kilo 103 M mega 10 G giga 10 t tera 10 2 Numbers Symbols degrees Q ohms percent A A amperes AC alternating current ACH analog input channel signal A D analog to digital ADC analog to digital converter an electronic device often an integrated circuit that converts an analog voltage to a digital number National Instruments Corporation G 1 DAQCard 1200 User Manual Glossary AIGND AWG B
28. 2 stability A 4 transfer characteristics A 2 theory of operation 4 5 to 4 8 analog input modes configurations differential connection considerations 3 7 to 3 8 floating signal sources 3 9 to 3 10 ground referenced signal sources 3 8 to 3 9 recommended input configurations table 3 7 DIFF definition table 2 4 purpose and use 2 5 NRSE definition table 2 4 purpose and use 2 5 RSE definition table 2 4 purpose and use 2 4 analog input signal connections bipolar and unipolar signal range vs gain table 3 5 common mode signal rejection 3 13 to 3 14 differential connections description 3 7 to 3 8 floating signal sources 3 9 to 3 10 l 1 DAQCard 1200 User Manual grounded signal sources 3 8 to 3 9 single ended connections 3 11 to 3 13 when to use 3 8 exceeding maximum input voltage ratings warning 3 4 floating signal sources 3 6 ground referenced signal sources 3 6 to 3 7 input configurations 3 7 to 3 14 instrumentation amplifier 3 5 to 3 6 pins 3 4 recommended input configurations table 3 7 single ended connections floating signal sources RSE configuration 3 11 to 3 12 grounded signal sources NRSE configuration 3 12 to 3 13 purpose and use 3 11 when to use 3 11 types of signal sources 3 6 to 3 7 analog output circuitry 4 11 DAC timing 4 12 polarity configuration 2 5 to 2 6 settings table 2 5 power management modes table C 1 power on state 4 12 signal conn
29. Architecture Engineering Software Package external control signal to trigger A D conversions external interrupt signal farads first in first out memory buffer the first data stored is the first data sent to the acceptor FIFOs are often used on DAQ devices to temporarily store incoming or outgoing data until that data can be retrieved or output For example an analog input FIFO stores the results of A D conversions until the data can be retrieved into system memory a process that requires the servicing of interrupts and often the programming of the DMA controller This process can take several milliseconds in some cases During this time data accumulates in the FIFO for future retrieval With a larger FIFO longer latencies can be tolerated In the case of analog output a FIFO permits faster update rates because the waveform data can be stored on the FIFO ahead of time This again reduces the effect of latencies associated with getting the data from system memory to the DAQ device gate input signal National Instruments Corporation G 3 DAQCard 1200 User Manual Glossary hex in T O ISA LED LSB MB MSB NC NRSE DAQCard 1200 User Manual hexadecimal hertz the number of scans read or updates written per second inches input output the transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control interfaces Ind
30. CD CE CLK CMOS CMRR D A DAQ DC DGND DIFF DIN DAQCard 1200 User Manual analog input ground signal American Wire Gauge binary coded decimal Celsius card enable signal clock input signal complementary metallic oxide semiconductor common mode rejection ratio a measure of an instrument s ability to reject interference from a common mode signal usually expressed in decibels dB digital to analog data acquisition 1 collecting and measuring electrical signals from sensors transducers and test probes or fixtures and inputting them to a computer for processing 2 collecting and measuring the same kinds of electrical signals with A D and or DIO boards plugged into a computer and possibly generating control signals with D A and or DIO boards in the same computer direct current digital ground signal differential configuration digital input signal G 2 National Instruments Corporation DMA DNL DOUT EISA ESP EXTCONV EXTINT FIFO GATE Glossary direct memory access a method by which data can be transferred to from computer memory from to a device or memory on the bus while the processor does something else DMA is the fastest method of transferring data to from computer memory differential nonlinearity a measure in least significant bit of the worst case deviation of code widths from their ideal value of 1 LSB digital output signal Extended Industry Standard
31. CONV GATBO GATB1 OUTB2 CLKB2 DGND Figure 3 1 DAQCard 1200 1 0 Connector Pin Assignments 3 2 National Instruments Corporation Chapter 3 Signal Connections Signal Connection Descriptions The following table describes the connector pins on the DAQCard 1200 front I O connector by pin number and gives the signal name and the significance of each signal connector pin Pins Signal Name Direction Reference Description 1 8 ACH lt 0 7 gt AI AGND Analog Channel 0 through 7 Analog input channels 0 through 7 9 AISENSE AIGND AI AGND Analog Input Sense Analog Input Ground Connected to AGND in RSE mode analog input sense in NRSE mode 10 DACOOUT AO AGND DACO Output Voltage output signal for analog output channel 0 11 AGND N A N A Analog Ground Analog output ground reference for analog output voltages This signal is the bias current return point for differential measurements 12 DACIOUT AO AGND DACI Output Voltage output signal for analog output channel 1 13 DGND N A N A Digital Ground Voltage ground reference for the digital signals and the 5 V supply 14 21 PA lt 0 7 gt DIO DGND Port A 0 through 7 Bidirectional data lines for port A PA7 is the MSB and PAO is the LSB 22 29 PB lt 0 7 gt DIO DGND Port B 0 through 7 Bidirectional data lines for port B PB7 is the MSB and PBO is the LSB 30 37 PC lt 0 7 gt DIO DGND Port C 0 through 7 Bidire
32. DAQ DAQCard 1200 User Manual Multifunction 1 0 Card for the PCMCIA Bus Sr NATIONAL ri October 1999 Editi gt INSTRUMENTS Part ee Rott Worldwide Technical Support and Product Information www natinst com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 7940100 Worldwide Offices Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 284 5011 Canada Calgary 403 274 9391 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Greece 30 1 42 96 427 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 Norway 32 27 73 00 Singapore 2265886 Spain Barcelona 93 582 0251 Spain Madrid 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2377 1200 United Kingdom 01635 523545 For further support information see the Technical Support Resources appendix To comment on the documentation send e mail to techpubs natinst com Copyright 1995 1999 National Instruments Corporation All rights reserved Important Information Warranty The DAQ Card 1200 is warranted against defects in materials and workmanship for a period of one year from the date of shipment as
33. Digital 1 0 Connections DAQCard 1200 In Figure 3 8 port A is configured for digital output and ports B and C are configured for digital input Digital input applications include receiving TTL signals and sensing external device states such as the switch in Figure 3 8 Digital output applications include sending TTL signals and driving external devices such as the LED shown in Figure 3 8 DAQCard 1200 User Manual 3 16 National Instruments Corporation Chapter 3 Signal Connections Port C Pin Connections The signals assigned to port C depend on how the 82CS55A is configured In mode 0 or no handshaking configuration port C is configured as two 4 bit I O ports In modes 1 and 2 or handshaking configuration port C is used for status and handshaking signals with zero two or three lines available for general purpose I O Table 3 3 summarizes the port C signal assignments for each configuration Note Table 3 3 shows both the port C signal assignments and the terminology correlation between different documentation sources The 82C55A terminology refers to the different 82C55A configurations as modes whereas NI DAQ and LabVIEW documentation refers to them as handshaking and no handshaking These signal assignments are the same for all four 82C55A PPIs Table 3 3 Port C Signal Assignments Configuration Terminology Signal Assignments 82C55A DAQCard 1200 NI DAQ User Man
34. EXTUPDATE for data acquisition and DAC timing The second group of counter timers is called Group B and includes BO B1 and B2 You can use counters BO and B1 for internal data acquisition and DAC timing or you can use the external timing signal CLKB1 for analog input timing If you are not using Counters BO and B1 for internal timing you can use these counters as general purpose counter timers Counter B2 is reserved for external use as a general purpose counter timer For a more detailed description of Counter Group A and Counters BO and B1 refer to the following Analog Input and Analog Output sections Analog Input The DAQCard 1200 has eight channels of analog input with software programmable gain and 12 bit A D conversion The DAQCard 1200 also contains data acquisition timing circuitry for automatic timing of multiple A D conversions and includes advanced options such as external triggering gating and clocking Figure 4 4 shows a block diagram of the analog input circuitry National Instruments Corporation 4 5 DAQCard 1200 User Manual Chapter 4 Theory of Operation ACHO ACH1 ACH2 ACH3 ACH4 ACH5 ACH6 ACH7 AISENSE ryyyyyyy AIGND 1 0 Connector EXTTRIG A D tk Data 12 Bit Paa sampe gt ADC Ao A D FIFO 8 3 CON 8 Data V oO Data 7 a 3 8 hael WRT RD g Gain
35. If you select a bipolar range the two s complement coding is selected In this mode 5 V input corresponds to F800 hex 2 048 decimal and 5 V corresponds to TFF hex 2 047 decimal If you select a unipolar mode the straight binary coding is selected In this mode 0 V input corresponds to 0 hex and 10 V corresponds to FFF hex 4 095 decimal National Instruments Corporation 2 3 DAQCard 1200 User Manual Chapter 2 Installation and Configuration Analog Input Mode The DAQCard 1200 has three different input modes referenced single ended RSE non referenced single ended NRSE and differential DIFF Single ended configuration provides eight input channels DIFF configuration provides four input channels Table 2 2 describes these configurations Table 2 2 Analog Input Modes for the DAQCard 1200 Analog Input Modes Description RSE Referenced single ended mode provides eight single ended inputs with the negative input of the instrumentation amplifier referenced to AISENSE AIGND which is tied to ground through about 200 resistance default setting NRSE Non referenced single ended configuration provides eight single ended inputs with the negative input of the instrumentation amplifier tied to AISENSE AIGND and not connected to ground DIFF Differential mode provides four differential inputs with the positive input of the instrumentation amplifier tied to channels 0 2 4 or 6 and the nega
36. M2 but if the computer has only has one serial port IRQ3 should be usable I run a memory utility and it appears there is no memory available for Card Services What should I do You should remove your memory manager by commenting it out of the CONFIG SYS file Next you can rerun the memory utility Memory managers often consume an enormous amount of memory and you will need to determine what memory is really usable by Card Services When you have determined what memory is available for Card Services reinstall your memory manager and make the necessary changes to provide Card Services with the memory needed We suggest that you use the minimum amount of memory for Card Services namely 4 to 12 kB which frees more memory for the memory manager D 3 DAQCard 1200 User Manual Appendix D PC Card Questions and Answers Resource Conflicts 1 How do I resolve conflicts between my memory manager and Card Services Card Services can usually use memory space that is not being used for real RAM on the system Even when this is the case you should still exclude the memory addresses used by Card Services from use by any memory manager that may be installed DAQCard 1200 User Manual D 4 National Instruments Corporation Technical Support Resources This appendix describes the comprehensive resources available to you in the Technical Support section of the National Instruments Web site and provides technical support tele
37. OSt 8 IN ssesceisessrerectioteaber ate vtesunet 100 pV C Gain temperature coefficient 0 40 ppm C Analog Output Output Characteristics Number of Channels eee 2 voltage ReSOLUtION ccccecceeceeessceceesesteeeeceseneee 12 bits 1 in 4 096 Max update rate cc eeeesseseseerereeeeeeneees 20 kS s Type Of DAC orii nS teen Double buffered Data transfers eeeeesseeeneeceseeeneeeeeees Interrupts programmed I O Transfer Characteristics Relative accuracy INL 0 0 0 cee 0 5 LSB typ 1 LSB max DNE sce scl EEE Bo 0 5 LSB typ 0 9 LSB max MOMNOtonicity eee eee eeseceeeeeseeeseeeeeeeees 12 bits guaranteed Offset error After calibration 0 5 mV max Before calibration cccccceceeeeeeee 75 mV max Gain error relative to internal reference After calibration eee 0 02 of reading max Before calibration eee 2 of reading max Tf you perform simultaneous AI and AO reliable continuous rates are limited to 0 5 to 1 kS s and is configuration dependent DAQCard 1200 User Manual A 4 National Instruments Corporation Voltage Output Output impedance ee eeeeeeeee Current drive Protection Power on state 0 gt 110 ms to 110 ms Dynamic Characteristics Settling time to full scale step Stability Offset temperature coefficient Gain temperature coefficient 0 Digital 1 0 Number of channels
38. TRIG f tty gt tg 50 ns minimum VIL EXTCONV CONVERT gt ty Ay tw 50 ns minimum gt tt Me Pee ye es A a Figure 3 13 Posttrigger DAQ Timing In the pretrigger mode EXTTRIG serves as a stop trigger signal Data is acquired both before and after the stop trigger occurs A D conversions are software enabled which initiates the data acquisition operation However the sample counter is not started until a rising edge is sensed on the EXTTRIG input Conversions remain enabled until the sample counter counts to zero The maximum number of samples acquired after the stop trigger is limited to 65 535 The number of samples acquired before the trigger is limited only by the size of the memory buffer available for data acquisition National Instruments Corporation 3 23 DAQCard 1200 User Manual Chapter 3 Signal Connections Figure 3 14 shows a pretrigger data acquisition timing sequence using EXTTRIG and EXTCONV The data acquisition operation has been initiated through software Notice that the sample counter has been programmed to allow five conversions after the rising edge on the EXTTRIG signal Additional transitions on the EXTTRIG line have no effect until you initiate a new data acquisition sequence tw VIH EXTTRIG Aw gt tw 50 ns minimum VIL EXTCONV Vf ON Nef Vf Ved CONVERT A A i i A i Figure 3 14 Pretrigger DAQ Timing
39. age at the front panel I O connector You can configure each analog output channel for either unipolar or bipolar output A unipolar configuration has a range of 0 to 10 V at the analog output A bipolar configuration has a range of 5 to 5 V at the analog output If you select a bipolar range for a D A conversion DAC the two s complement coding is selected In this mode data values written to the analog output channel range from F800 hex 2 048 decimal to 7FF hex 2 047 decimal If you select a unipolar range for a DAC you are selecting the straight binary coding In this mode data values written to the analog output channel range from 0 to FFF hex 4 095 decimal Digital 1 0 Configuration The DAQCard 1200 uses the MSM82C55 programmable peripheral interface PPI This chip provides 24 digital lines in the form of three ports A B and C On power up all three ports reset to high impedance inputs For information about configuring the MSM82C55 see the DAQ Timing Connections section of Chapter 3 Signal Connections J Caution The DAQCard 1200 DIO lines are not pulled up or pulled down If you are using these lines as digital outputs add 10 kQ resistors to 5 V or DGND depending on your application to the DIO line s you are using Counter Configuration DAQCard 1200 User Manual You can use the MSM82C53A counter timers for general purpose timing applications such as pulse and square wave generation event counting a
40. alog Input Configuration section of Chapter 2 Installation and Configuration National Instruments Corporation 3 9 DAQCard 1200 User Manual Chapter 3 Signal Connections 1 ACHO ome ACH 2 3 so 5 ACH 4 Floating so Signal yv S ACH 6 Source 4 co ACH 1 2 So _ Vm Measured Voltage 4 ACH3 ae 100 ka so 6 ACH5 Bias so Current Return 8 AGRE so Paths 11 AGND Front I O Connector Yo o o o DAQCard 1200 in DIFF Configuration DAQCard 1200 User Manual Figure 3 4 Differential Input Connections for Floating Sources The 100 KQ resistors shown in Figure 3 4 create a return path to ground for the bias currents of the instrumentation amplifier If there is no return path the instrumentation amplifier bias currents charge stray capacitances resulting in uncontrollable drift and possible saturation in the amplifier A resistor from each input to ground as shown in Figure 3 4 provides bias current return paths for an AC coupled input signal If the input signal is DC coupled you need only the resistor that connects the negative signal input to ground This connection does not lower the input impedance of the analog input channel 3 10 National Instruments Corporation Chapter 3 Signal Connections Single Ended Connection Considerations Single ended connections are those in which all DAQCard 1200 analog input sig
41. are using accessory products read the terminal block and cable assembly installation guides They explain how to physically connect the relevant pieces of the system Consult these guides when you are making your connections SCXI chassis manuals If you are using SCXI read these manuals for maintenance information on the chassis and installation instructions xi DAQCard 1200 User Manual About This Manual Related Documentation The following documents contain information that you may find helpful as you read this manual e Your NI DAQ or LabVIEW software manuals for PC compatibles e Your computer operating manual which explains how to insert cards into the PC Card slot e Dither in Digital Audio by John Vanderkooy and Stanley P Lipshitz Journal of the Audio Engineering Society Vol 35 No 12 Dec 1987 DAQCard 1200 User Manual xii National Instruments Corporation Introduction This chapter describes the DAQCard 1200 lists what you need to get started the optional software and optional equipment and explains how to unpack the DAQCard 1200 About the DAQCard 1200 Thank you for your purchase of the National Instruments DAQCard 1200 The DAQCard 1200 is a low cost low power analog input analog output digital I O and timing I O card for PCs equipped with a Type II PC Card slot The card contains a 12 bit successive approximation ADC with eight inputs which you can configure as eight single ended or
42. at is compliant to version 2 0 or higher Operation 1 My PC Card works when inserted before power on time but it does not work when hot inserted What is wrong You may have an interrupt conflict If you have a utility such as MSD EXE run it to determine the allocated interrupts then refer to question 5 in the Resources section MSD EXE is usually shipped with Microsoft Windows National Instruments Corporation D 1 DAQCard 1200 User Manual Appendix D PC Card Questions and Answers Resources My computer locks up when I use a PC Card What should I do This usually happens because Card Services allocated an unusable interrupt level to the PC Card For example on some computers interrupt level 11 is not routed to PC Cards If Card Services is not aware of this it may assign interrupt 11 to a PC Card even though the interrupt is not usable When a call uses the interrupt the interrupt never occurs and the computer locks up waiting for a response For information about how to locate an interrupt that is free to be used refer to question 4 in the Resources section Is there a way I can conserve power on my PC Card when it is not in use Yes If you are using NI DAQ for PC compatibles version 4 8 0 or later a DOS utility called DAQPOWER_EXE will switch all National Instruments PC Cards between normal mode and power down mode Power up and power down icons are also installed for Windows users
43. ation or through software control in a freerun operation Continuous Data Acquisition In a continuous data acquisition operation samples are taken at regular sample intervals without any delays Therefore each sample is taken with the same sample interval This applies to both single channel and multiple channel data acquisition in either freerun or controlled operation The sample interval is either controlled externally by EXTCONV or internally by counter AO of the timing circuitry 4 8 National Instruments Corporation Chapter 4 Theory of Operation Interval Data Acquisition In an interval data acquisition operation a new period called the interval cycle is defined Within each interval cycle a predefined number of samples is taken at regular sample intervals and conversions are stopped for the remainder of the interval cycle A data acquisition operation consists of back to back interval cycles In single channel interval data acquisition you select the number of samples you want in each interval cycle from a single channel In multiple channel interval data acquisition the channels are scanned once during each interval cycle The interval cycle timing can be externally controlled through OUTB1 or controlled internally by counter B1 of the timing circuitry For an example of a multiple channel interval data acquisition operation refer to the description of interval scanning signal timing in the DAQ Timing Connections section
44. cation NI DAQ Driver Software The NI DAQ driver software is included at no charge with all National Instruments DAQ hardware NI DAQ has an extensive library of functions that you can call from your application programming environment These functions include routines for analog input A D conversion buffered data acquisition high speed A D conversion analog output D A conversion waveform generation digital I O counter timer operations SCXI RTSI self calibration messaging and acquiring data to extended memory NI DAQ also internally addresses many of the complex issues between the computer and the plug in board such as programming interrupts and DMA controllers NI DAQ maintains a consistent software interface among its different versions so that you can change platforms with minimal modifications to your code Figure 1 1 illustrates the relationship between NI DAQ and LabVIEW and LabWindows CVI You can see that the data acquisition parts of Lab VIEW and LabWindows CVI are functionally equivalent to the NI DAQ software National Instruments Corporation 1 3 DAQCard 1200 User Manual Chapter 1 Introduction Conventional Programming LabVIEW LabWindows CVI Environment PC Macintosh or PC or PC Macintosh or Sun SPARCstation Sun SPARCstation Sun SPARCstation NI DAQ Driver Software Jo DAQ Personal or lt gt Computer SCXI Hardware i Workstation
45. cautions are necessary However for your own safety and to protect the DAQCard 1200 never attempt to touch the pins of the connectors National Instruments Corporation 1 5 DAQCard 1200 User Manual Installation and Configuration This chapter describes how to install and software configure the DAQCard 1200 Installation There are two basic steps to installing the DAQCard 1200 1 You must have Card amp Socket Services 2 0 or a later version on your computer 2 Insert the DAQCard 1200 and attach the I O cable The DAQCard 1200 has two connectors a 68 pin PCMCIA bus connector on one end and a 50 pin I O connector on the other end Insert the PCMCIA bus connector into any available Type II PC Card slot until the connector is seated firmly Notice that the card is keyed so that it can be inserted only one way If your computer supports hot insertion you may insert or remove the DAQCard 1200 at any time whether your computer is powered on or off You can use either a 50 pin female or a 50 pin male cable to plug into the DAQCard 1200 For more information on these products see the Optional Equipment section in Chapter 1 Introduction Notice that the cable is keyed so that you can insert it only one way Be careful not to put strain on the I O cable when inserting it into and removing it from the DAQCard 1200 Always grasp the cable by the connector you are plugging or unplugging Never pull directly on the I O cable
46. ced signal sources differential connections 3 8 to 3 9 recommended input configurations table 3 7 installation DAQCard 1200 2 1 unpacking the DAQCard 1200 1 5 instrumentation amplifier 3 5 to 3 6 interval scanning data acquisition description 3 24 multiple channel interval scanning figure 3 25 INTR signal table 3 18 T O connector exceeding maximum ratings warning 3 1 pin assignments figure 3 2 L Lab PC compared with DAQPad 1200 and DAQCard 1200 B 1 to B 2 LabVIEW and LabWindows CVI application software 1 3 manual See documentation mode input timing 3 19 mode 1 output timing 3 20 mode 2 bidirectional timing 3 20 to 3 21 National Instruments Corporation l 5 Index National Instruments Web support E 1 to E 2 NI DAQ driver software 1 3 to 1 4 NRSE input configuration 2 5 definition table 2 4 recommended input configurations table 3 7 single ended connections for ground referenced signal sources 3 12 to 3 13 0 OBF signal table 3 18 online problem solving and diagnostic resources E 1 operation of DAQCard 1200 See theory of operation optional equipment 1 5 OUT signals general purpose timing signal connections 3 26 to 3 30 timing requirements signals figure 3 30 OUTBO signal table 3 3 OUTB signal DAQ timing connections 3 24 description table 3 3 maximum voltage input rating 3 26 OUTB2 signal table 3 4 P PA lt 0 7 gt signals descri
47. cneecaecaensecnaeenees 3 24 Figure 3 15 Interval Scanning Signal Timing eee eee eeee cee ceeeeaecneceeeeeeees 3 25 Figure 3 16 EXTUPDATE Signal Timing for Updating DAC Output 3 26 Figure 3 17 Event Counting Application with External Switch Gating 0 00 3 27 Figure 3 18 Frequency Measurement Application cece eee eeeeeeesee ce ceseeseeeees 3 29 Figure 3 19 General Purpose Timing Signals 0 00 0 ce eeeeeceeeseeeseceeeeseeseceeeeeeees 3 30 Figure 4 1 DAQCard 1200 Block Diagram 0 00 eeeeeeceeeeeeneceeeeeeeees 4 1 Figure 4 2 PC Card I O Interface Circuitry Block Diagram eee eee 4 2 Figure 4 3 Timing CmUcuitry cn sse scesessencsseesssepcheteeties ca pseshvte cs rera E aSa i s 4 4 Figure 4 4 Analog Input Circuitry cece cee ceee cre csseeecenecneceseeesenseeeseeseeeeees 4 6 Figure 4 5 Analog Output Circuitry ee cee eeceseeeeeeeeeceeeseecaeesaecaeaeesaeeaees 4 11 Figure 4 6 Digital I O Circuitry eee cece cseeeeeceeeseecnecaecneseseeeeneseereneeees 4 13 Tables Table 2 1 Analog T O Setting Sorner een e r A E TR E coves 2 3 Table 2 2 Analog Input Modes for the DAQCard 1200 s sesseseesesesseseseesesesesseesee 2 4 Table 3 1 Bipolar and Unipolar Analog Input Signal Range Versus Gain 3 5 Table 3 2 Recommended Input Configurations for Ground Referenced and Floating Signal SOULCES eee ee ceeeeeceeeeeeeeeceseeeseeseecaecnaeeaeenaees 3 7 Table 3 3 Port C Signal Assignments 000 0 ec eee
48. ctional data lines for port C PC7 is the MSB and PCO is the LSB 38 EXTTRIG DI DGND External Trigger External control signal to trigger a DAQ operation 39 EXTUPDATE DI DGND External Update External control signal to update DAC outputs 40 EXTCONV DIO DGND External Convert External control signal to time A D conversions DI and drive SCANCLK when you use SCXI DO 41 OUTBO DO DGND Output BO Voltage output signal of counter BO 42 GATBO DI DGND Gate BO External control signal for gating counter BO 43 OUTB1 DIO DGND Output B1 Voltage output signal of counter B1 when selected as output DO This is the external control signal for timing an interval cycle when selected as input DI 44 GATB1 DI DGND Gate B1 External control signal for gating counter B1 National Instruments Corporation 3 3 DAQCard 1200 User Manual Chapter 3 Signal Connections Pins Signal Name Direction Reference Description 45 CLKB1 DI DGND Clock B1 External control clock signal for counter B1 46 OUTB2 DO DGND Counter B2 Voltage output signal of counter B2 47 GATB2 DI DGND Gate B2 External control signal for gating counter B2 48 CLKB2 DI DGND Clock B2 External control clock signal for counter B2 49 5 V DO DGND 5 Volts Fused for up to 1 A of 5 V supply but limit current to 250 mA 50 DGND N A N A Digital Ground Voltage ground reference for the digital signals and the 5 V sup
49. ctions Digital 1 0 Signal Connections AN Caution The DAQCard 1200 DIO lines are not pulled up or pulled down If you are using these lines as digital outputs add 10 kQ resistors to 5 V or DGND depending on your application to the DIO line s you are using Pins 13 through 37 of the front connector are digital I O signal pins Digital I O on the DAQCard 1200 uses the 82C55A integrated circuit The 82C55A is a general purpose peripheral interface containing 24 programmable I O pins These pins represent the three 8 bit ports PA PB and PC of the 82C55A Pins 14 through 21 are connected to the digital lines PA lt 0 7 gt for digital I O port A Pins 22 through 29 are connected to the digital lines PB lt 0 7 gt for digital I O port B Pins 30 through 37 are connected to the digital lines PC lt 0 7 gt for digital I O port C Pin 13 DGND is the digital ground pin for all three digital I O ports Refer to Appendix A Specifications for signal voltage and current specifications National Instruments Corporation 3 15 DAQCard 1200 User Manual Chapter 3 Signal Connections Figure 3 8 illustrates signal connections for three typical digital I O applications Port C PC lt 0 7 gt gt o 22 PBO O TTL Signal Pore PB lt 0 7 gt m IN 29 P87 oe gt 13 5 V LED A y DGND Port A ad PA lt 0 7 gt Je 30 PAO 1 O Connector T Figure 3 8
50. d Configuration If you are using LabWindows CVI the software installation instructions are in Part 1 Introduction to LabWindows CVI of the Getting Started with LabWindows CVI manual After you have installed LabWindows CVI refer to Chapter 1 Configuring LabWindows CVI of the LabWindows CVI User Manual for software configuration instructions Then follow DAQ configuration instructions in your NI DAQ user manual Analog Input Configuration At startup the DAQCard 1200 defaults to the following configuration e Referenced single ended input mode e 5 V analog input range Table 2 1 lists the available analog I O configurations for the DAQCard 1200 and shows the default settings Table 2 1 Analog 1 0 Settings Parameter Configuration Analog Input Bipolar 5 V default setting Polarity Unipolar 0 10 V Analog Input Mode Referenced single ended RSE default setting Non referenced single ended NRSE Differential DIFF The analog input circuitry is software configurable AN Warning Connections including power signals to ground and vice versa that exceed any of the maximum signal ratings on the DAQCard 1200 can damage your card and computer National Instruments is not liable for any damages or injuries resulting from incorrect signal connections Analog Input Polarity You can select the analog input on the DAQCard 1200 for either a unipolar range 0 to 10 V or a bipolar range 5 to 5 V
51. d in This Manual eee ee ceeceeeceeceeeeeeeseeceeceeesaecaeaececeeeeeeeseees x National Instruments Documentation ssseseseesseeessstesrsetstsrereerrsreeresreresrsreresserresreererent xi Related Documentations iiis sc seessss season ess dsbscensssdetseceesceptsseesscedlagessssbssssnstevaassenstee cb ones xii Chapter 1 Introduction About the DAQCard 1200 0 0 i i eree eostas E a Naa R 1 1 What You Need to Get Started issii sree eT aers s 1 2 Software Programming Choices ssesesseseeeesesreseseeersrestsrresreteseetesrsresresertesrerrsreeeesrereses 1 2 LabVIEW and LabWindows CVI Application Software eee 1 3 NI DAQ Driver Software ccccccccssececscecessecesseeecesseceseeeecsesseeeseeensseeeeneaees 1 3 Register Level Programming csseesceceeceeseceeeecesecesceceeeecseceeaceeeesaeeeeeennes 1 4 Optional Equipment oee a e0s Beeca noe ee AES tenes ev EEEE o aa aai 1 5 Unpacking ee rrt rri scnens stead ones ese aa rear oE Ee Eo Eere aa Dee seis bbe SESE ate neat aep cs 1 5 Chapter 2 Installation and Configuration SEAIN i Estne a AOne ONENE EPEE ESE EEEE EE EENT EE OE EEEN 2 1 Configuration s hinge ee A ena ee 2 2 Analog Input Configuration 2 0 eee eecceseecsecssecseceseesecesceseceseseseeeeaeseneeaes 2 3 Analog Input Polarity 0 0 cece eseeecseeesecseesececeseceeeseeereneeeeneeaes 2 3 Analog Input Modes asini ginta Rn OE R EAEE E 2 4 RSE Input Eight Channels Default Setting 2 4 NRSE Input Eight Channels 0 eee
52. dix A Specifications lists the specifications of the DAQCard 1200 Appendix B Differences among the Lab PC the DAQPad 1200 and the DAQCard 1200 contains a summary of the functional differences among the Lab PC the DAQPad 1200 and the DAQCard 1200 Appendix C Power Management Modes describes the power management modes of the DAQCard 1200 Appendix D PC Card Questions and Answers contains a list of common questions and answers relating to PC Card operation Appendix E Technical Support Resources contains forms you can use to request help from National Instruments or to comment on our products and manuals ix DAQCard 1200 User Manual About This Manual e The Glossary contains an alphabetical list and description of terms used in this manual including abbreviations acronyms metric prefixes mnemonics and symbols e The Jndex contains an alphabetical list of key terms and topics in this manual including the page where you can find each one Conventions Used in This Manual lt gt ZN aN bold italic italic monospace NI DAQ PC DAQCard 1200 User Manual The following conventions are used in this manual Angle brackets enclose the name of a key on the keyboard for example lt shift gt Angle brackets containing numbers separated by an ellipsis represent a range of values associated with a bit or signal name for example DBIO lt 3 0 gt This icon to the left of bold italicized te
53. ected from 0 5 to 5 5 V Counters Functional Initialize to undefined states Functional Initialize to undefined states Individual counters of the 82C53 must be fully programmed before use Protected from 0 5 to 5 5 V Individual counters of the 82C53 must be fully programmed before use Protected from 0 5 to 5 5 V DAQCard 1200 User Manual C 2 National Instruments Corporation PC Card Questions and Answers This appendix contains a list of common questions and answers relating to PC Card operation The questions are grouped according to the type of information requested You may find this information useful if you are having difficulty with the PC Card system software configuration Configuration 1 DoI need to use my PC Card configuration utility to configure the National Instruments PC Cards No We recommend that you do not configure our PC Cards using PC Card Control or an equivalent PC Card configuration utility Use the configuration utilities included with the NI DAQ driver software to properly configure your card The appropriate utilities are WOAQCONF for Windows users or DAQCONF for DOS users 2 What should I do if my computer does not have Card and Socket Services version 2 0 or later Contact the manufacturer of your computer or of your PC Card adapter and request the latest Card and Socket PC Card driver Our NI DAQ software will work with any Card and Socket Service driver th
54. ections Mode 1 Output Timing Figure 3 10 shows the timing specifications for an output transfer in mode 1 T3 WRT T4 lt ____ gt OBF Ti Ae INTR T6 lt gt ACK T5 DATA lt t _ gt T2 Name Description Minimum Maximum Tl WRT 0 to INTR 0 250 T2 WRT to output 200 T3 WRT 1 to OBF 0 150 T4 ACK 0 to OBF 1 150 T5 ACK pulse width 100 T6 ACK 1 to INTR 1 150 All timing values are in nanoseconds Figure 3 10 Mode 1 Timing Specifications for Output Transfers Mode 2 Bidirectional Timing Figure 3 11 shows the timing specifications for bidirectional transfers in mode 2 DAQCard 1200 User Manual 3 20 National Instruments Corporation Chapter 3 Signal Connections T1 WRT T6 A OBF INTR J T7 A ACK T3 kK STB pa lt gt T10 T4 IBF noA T2 T5 T8 T9 P gt a gt 4 gt DATA E Name Description Minimum Maximum T1 WRT to OBF 0 150 T2 Data before STB 1 20 T3 STB pulse width 100 T4 STB 0 to IBF 1 150 T5 Data after STB 1 50 T6 ACK 0 to OBF 1 150 T7 ACK pulse width 100 T8 ACK 0 to output 150 T9 ACK 1 to output float 20 250 T10 RD 1 to IBF 0
55. ections 3 14 specifications A 4 to A 5 dynamic characteristics A 5 output characteristics A 4 stability A 5 transfer characteristics A 4 voltage output A 5 theory of operation 4 11 to 4 12 DAQCard 1200 User Manual l 2 bus interface specifications A 7 C calibration 5 1 to 5 3 EEPROM storage 5 1 equipment requirements 5 2 higher gains 5 2 overview 5 1 power management modes table C 2 using the 1200_Calibrate function 5 2 to 5 3 CLK signals general purpose timing signal connections 3 26 to 3 30 timing requirements signals figure 3 30 CLKB1 signal table 3 4 CLKB2 signal table 3 4 common mode signal rejection considerations 3 13 to 3 14 configuration analog input analog I O settings table 2 3 default settings 2 3 exceeding maximum ratings warning 2 3 input modes 2 4 to 2 5 input polarity 2 3 analog output polarity 2 5 to 2 6 counter timers 2 6 digital I O 2 6 PC Card D 1 typical configuration figure 2 2 Counter 0 on 82C53 A counter timer 3 22 Counter 1 on 82C53 A counter timer 3 22 counter timers configuration 2 6 power management modes table C 2 theory of operation 4 3 to 4 5 National Instruments Corporation D DAC OUTPUT UPDATE signal 3 25 to 3 26 DACOOUT signal table 3 3 DACIOUT signal table 3 3 DACWRT signal 3 26 DAQ and general purpose timing signal connections DAQ timing connections 3 22 to 3 26 general purpose timing connections 3 26 to 3
56. eeeeeeeseeseceeeeeeees 2 5 DIFF Input Four Channels cecceecesscceeeecereeeneceneeeeeees 2 5 Analog Output Configuration cee eee csecseeseeseeeeceeeeseeeseseeeseeeseeeeeeeeeaes 2 5 Analog Output Polarity 2 0 ceceeseseeeeeceeceseaeceeceeeeeeeeeeeaeeaees 2 6 Digital 1 O Conte urat on eies on aea E E E tates 2 6 Counter Configuration cee eeeecescesseseeesececeseeecesceeeeseeeaecaeceaesaeeseeeeseaeeaees 2 6 Chapter 3 Signal Connections W O COMME COR i vedere ces cones a oaee E aE a EEEo E EE EE EE eerste eer 3 1 Signal Connection DescriptionS esesesseseseeeresereesreeesrssrstssertesterrstenrerenrerinrenersrersee 3 3 Analog Input Signal Connections eee eceeeeeceseeeseceeeaeceeceseeeeeeseeereeeeeees 3 4 National Instruments Corporation v DAQCard 1200 User Manual Contents Types of Signal Sources eee ceceseeeeceseeseceseeeeecaeeeaecaeesaecneenaes 3 6 Floating Signal Sources eee cece eeeeeeeeeeeeeceeeaeeneenaee 3 6 Ground Referenced Signal Sources 0 ceeeseseeseeeeeeeees 3 6 Input Configurations sssi ie i eea sE 3 7 Differential Connection Considerations DIFF Configuration sesseossessessssstsssesessteeseeseeseesseese 3 7 Differential Connections for Grounded Signal Sources 3 8 Differential Connections for Floating Signal Sources 3 9 Single Ended Connection ConsiderationS 0 eee 3 11 Single Ended Connections for Floating Signal Sources RSE Configuration iepure en
57. eeo dsceseedsstegeysieesteateebessey EEAS NES SPIS ERES E EER 4 8 Data Acquisition Operation 0 0 0 cesses ceseeeeceseeeeeeeeeeeseeeeeeeenes 4 8 Continuous Data ACqUISIION eee cee cee ceeceeeeeceseeeeneeeeeeeeeeaes 4 8 Interval Data ACQUISITION cece ceteeteceeeeseeeeeeeeeeeeeseeeeeeneeeaes 4 9 Data A Cquisition Rates oo 5c 05 coscen fests uist oen r nre ae E e ESE S HENRI RSE 4 9 DAQCard 1200 User Manual vi National Instruments Corporation Contents Analog Output naseer nei ioan Aden a EEE Gals cbics tuk eE ESEE E OSSEA OEREN 4 11 Analog Output CircUltry s sccsoes ses gesseeessssehsseesscestsnessstescanasevvessscasttenas jensteseessees 4 11 Power On States sciic 3 dee tk shies Neh Ea E E oe Mode yete cect R eels 4 12 DAC TIMING orior nina e e E E E eee E A 4 12 Digital WO Zonia e eeno ne Bate MO a Se ik Ne ats 4 13 Chapter 5 Calibration Calibration at Higher Gains 22 s0 ssscsescesessepessescssesssevscssacesneobecsceesessaessnsaseussansosenss 5 2 Calibration Equipment Requirements eee eececeesceeeeeeeeseeeeceseeeeeeneeeaeeaeecaesnaeeaees 5 2 Using the Calibration Function eee ceesecseceseeeceseesecesceseeseeeeeseeeseseaeeseseaeenaenaes 5 2 Appendix A Specifications Appendix B Differences among the Lab PC the DAQPad 1200 and the DAQCard 1200 Appendix C Power Management Modes Appendix D PC Card Questions and Answers Appendix E Technical Support Resources Glossary Index Figures Figure 1 1 The Relationsh
58. equence 3 25 to 3 26 DATA signal table 3 18 DGND signal table 3 3 3 4 diagnostic resources online E 1 DIFF input configuration 2 5 definition table 2 4 recommended input configurations table 3 7 differential connections description 3 7 to 3 8 DIFF configuration considerations 3 7 to 3 8 floating signal sources 3 9 to 3 10 ground referenced signal sources 3 8 to 3 9 when to use 3 8 digital I O circuitry 4 13 configuration 2 6 power management modes table C 2 specifications A 5 to A 6 DAQCard 1200 User Manual Index digital I O signal connections illustration 3 16 pins 3 15 Port C pin connections 3 17 timing specifications 3 18 to 3 21 mode input timing 3 19 mode 1 output timing 3 20 mode 2 bidirectional timing 3 20 to 3 21 documentation conventions used in manual x National Instruments documentation xi organization of manual ix x related documentation xii dynamic characteristics analog input specifications A 3 analog output specifications A 5 E EEPROM storage of calibration data 5 1 environment specifications A 8 equipment optional 1 5 event counting application 3 27 with external switch gating figure 3 27 EXTCONV signal description table 3 3 interval scanning data acquisition 3 24 maximum voltage input rating 3 26 timing connections 3 22 to 3 24 EXTTRIG signal data acquisition timing 3 22 to 3 24 description table 3 3 maximum voltage input rating 3 26
59. er a leading 0 or a leading F hex to be added depending on the coding and the sign Thus data values read from the FIFO are 16 bits wide Data Acquisition Timing DAQCard 1200 User Manual A data acquisition operation refers to the process of taking a sequence of A D conversions when the sample interval the time between successive A D conversions is carefully timed A data acquisition operation can either acquire a finite number of samples controlled run or an infinite number of samples freerun The DAQCard 1200 unit can perform both single channel data acquisition and multiple channel scanned data acquisition in two modes continuous and interval The data acquisition timing circuitry consists of various clocks and timing signals that control the data acquisition operation Data acquisition timing consists of signals that initiate a data acquisition operation time the individual A D conversions gate the data acquisition operation and generate scanning clocks The data acquisition operation can either be timed by the timing circuitry or by externally generated signals These two modes are software configurable Data Acquisition Operation Data acquisition operations are initiated either externally through EXTTRIG or through software control The data acquisition operation is terminated either internally by counter A1 of the 82C53 A counter timer circuitry which counts the total number of samples taken during a controlled oper
60. esecseceseceeceeeseceeceeceseeseeeeseseeeeeens 3 17 Table 4 1 Analog Input Settling Time Versus Gain eee eeeeeeereeeeeeeeenes 4 10 Table 4 2 DAQCard 1200 Maximum Recommended Data Acquisition Rates 4 10 Table C 1 DAQCard 1200 Power Management Modes 0 0 0 0 es eeeeseeeeeseeeseeees C 1 DAQCard 1200 User Manual viii National Instruments Corporation About This Manual This manual describes the mechanical and electrical aspects of the DAQCard 1200 and contains information concerning its installation and operation The DAQCard 1200 is a compact low cost low power analog input analog output digital and timing I O card for IBM PC XT PC AT and compatible computers that are equipped with a Type II PC Card socket Organization of This Manual The DAQCard 1200 User Manual is organized as follows National Instruments Corporation Chapter 1 Introduction describes the DAQCard 1200 lists what you need to get started the optional software and optional equipment and explains how to unpack the DAQCard 1200 Chapter 2 Installation and Configuration describes how to install and software configure the DAQCard 1200 Chapter 3 Signal Connections describes the signals on the DAQCard 1200 I O connector Chapter 4 Theory of Operation explains the operation of each functional unit of the DAQCard 1200 Chapter 5 Calibration discusses the calibration procedures for the DAQCard 1200 analog I O circuitry Appen
61. evidenced by receipts or other documentation National Instruments will at its option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor The media on which you receive National Instruments software are warranted not to fail to execute programming instructions due to defects in materials and workmanship for a period of 90 days from date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period National Instruments does not warrant that the operation of the software shall be uninterrupted or error free A Return Material Authorization RMA number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty National Instruments believes that the information in this document is accurate The document has been carefully reviewed for technical accuracy In the event that technical or typographical errors exist National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition The reader should consult National Instr
62. first mode the DAC output voltage is updated as soon as you write to the corresponding DAC This is called the immediate update mode In the second mode the DAC output voltage does not change until a low level is detected either from counter A2 of the timing circuitry or from EXTUPDATE This mode is useful for waveform generation These two modes are software selectable F Note Configure both the DACs in either immediate update mode or later update mode Do not configure the DACs in a combination of both modes because doing so can result in premature updates on the waveform generation DAC whenever the immediate update DAC is updated Also if a waveform generation update occurs between an LSB write and an MSB write of the DAC in the immediate update mode you will receive an incorrect value from that DAC until the MSB is written Both of these effects are minimal at high waveform update rates DAQCard 1200 User Manual 4 12 National Instruments Corporation Chapter 4 Theory of Operation Digital 1 0 The digital I O circuitry has an 82C55A integrated circuit The 82C55A is a general purpose programmable peripheral interface PPI containing 24 programmable I O pins These pins represent the three 8 bit I O ports A B and C of the 82C55A as well as PA lt 0 7 gt PB lt 0 7 gt and PC lt 0 7 gt on the DAQCard 1200 I O connector Figure 4 6 shows the digital I O circuitry ZN
63. four differential channels The DAQCard 1200 also has two 12 bit DACs with voltage outputs 24 lines of TTL compatible digital I O and three 16 bit counter timer channels for timing I O The specially designed standard 50 pin I O connector for the DAQCard 1200 enables you to connect all your analog digital and timing signals directly to the card The DAQCard 1200 is fully software configurable and calibrated so that you can easily install the card and begin your acquisition The small size and weight of the DAQCard 1200 coupled with its low power consumption make this card ideal for use in portable computers making portable data acquisition practical The card requires very little power when operating thus extending the life of your computer batteries In addition the low cost and multifunctional nature of a system based on the DAQCard 1200 makes it ideal for laboratory work in industrial and academic environments The multichannel analog input is useful in signal analysis and data logging The 12 bit ADC is useful in high resolution applications such as chromatography temperature measurement and DC voltage measurement You can use the analog output channels to generate experimental stimuli or for machine and process control and analog function generation You can use the 24 TTL compatible digital I O line for switching external devices such as transistors and solid state relays for reading the status of external digital logic and for ge
64. gs into the parallel port of the computer It is functionally identical to the Lab PC In addition there are no jumpers for bus resource allocation this is done at configuration time with software It also has no potentiometers because it is software calibrated It is a jumperless and a potless unit The DAQPad 1200 is register compatible with the Lab PC It has a few additional registers for calibration purposes The DAQCard 1200 is register compatible with the DAQPad 1200 and the Lab PC and functionally identical to it Register level software developed for the Lab PC works directly on a configured DAQCard 1200 However you calibrate the DAQCard 1200 with software instead of potentiometers National Instruments Corporation B 1 DAQCara 1200 User Manual Appendix B Differences among the Lab PC the DAQPad 1200 and the DAQCard 1200 The following table summarizes the differences among the three products Functionality Lab PC DAQPad 1200 DAQCard 1200 Bus resource allocation Jumpers Software Software automatic Calibration Potentiometers Software Software DMA Uses DMA Cannot use DMA Cannot use DMA Waveform generation Can do waveform Cando waveform Should do either generation on one generationonone immediate update on both DAC and DAC and or waveform generation immediate updates immediate on both but not a on the other DAC updates on the combination See other Chapter 4 Theory of Operation f
65. h as pulse and square wave generation event counting and pulsewidth time lapse and frequency measurement For these applications the CLK and GATE signals at the front T O connector control the counters The single exception is counter BO 3 26 National Instruments Corporation Chapter 3 Signal Connections which has an internal 2 MHz clock Refer to the DAQCard 1200 Register Level Programmer Manual for programming information The GATE CLK and OUT signals for counters B1 and B2 are available at the I O front connector The GATE and CLK pins are internally pulled up to 5 V through a 100 kQ resistor Refer to Appendix A Specifications for signal voltage and current specifications You perform pulse and square wave generation by programming a counter to generate a timing signal at its OUT output pin Perform event counting by programming a counter to count rising or falling edges applied to any of the 82C53 CLK inputs You can then read the counter value to determine the number of edges that have occurred You can gate counter operations on and off during event counting Figure 3 17 shows connections for a typical event counting operation in which a switch is used to gate the counter on and off ATL F 5 V 10 kQ Signal Source CLK OUT oo o GATE Switch Counter from Group B 13 DGND 1 O Connector a V DAQCard 1200
66. in Chapter 3 Signal Connections Data Acquisition Rates Maximum data acquisition rates number of samples per second are determined by the conversion period of the ADC plus the sample and hold acquisition time During multiple channel scanning the data acquisition rates are further limited by the settling time of the input multiplexers and programmable gain amplifier After the input multiplexers are switched the amplifier must be allowed to settle to the new input signal value to within 12 bit accuracy before you perform an A D conversion or 12 bit accuracy will not be achieved The settling time is a function of the gain selected Table 4 1 shows the recommended settling time for each gain setting during multiple channel scanning Table 4 2 shows the maximum recommended data acquisition rates for both single channel and multiple channel data acquisition For single channel scanning this rate is limited only by the ADC conversion period plus the sample and hold acquisition time which is specified at 10 us 11 us if EXTCONV is used National Instruments Corporation 4 9 DAQCard 1200 User Manual Chapter 4 Theory of Operation For multiple channel data acquisition observing the data acquisition rates in Table 4 2 ensures 12 bit accuracy Table 4 1 Analog Input Settling Time Versus Gain Gain Setting Settling Time Recommended 1 2 5 10 10 us max 20 12 us typ 15 us max 50 25 us typ 30 us max 100 60 us ty
67. ing may damage the DAQCard 1200 and the computer National Instruments is nor liable for any damages resulting from such signal connections DAQCard 1200 User Manual 3 4 National Instruments Corporation Chapter 3 Signal Connections Table 3 1 Bipolar and Unipolar Analog Input Signal Range Versus Gain Input Signal Range Gain Setting Bipolar Unipolar 1 5 V Oto 10 V 2 42 5 V 0to5V 5 1 V 0to2V 10 500 mV Otol V 20 250 mV 0 to 500 mV 50 100 mV 0 to 200 mV 100 50 mV 0 to 100 mV How you connect analog input signals to the DAQCard 1200 depends on how you configure the card analog input circuitry and the type of input signal source With different DAQCard 1200 configurations you can use the instrumentation amplifier in different ways Figure 3 2 shows a diagram of the DAQCard 1200 instrumentation amplifier Vm Vin Vin GAIN Instrumentation Amplifier Vv Measured Voltage Figure 3 2 DAQCard 1200 Instrumentation Amplifier National Instruments Corporation DAQCard 1200 User Manual Chapter 3 Signal Connections DAQCard 1200 User Manual The instrumentation amplifier applies gain common mode voltage rejection and high input impedance to the analog input signals connected to the DAQCard 1200 Signals are routed to the positive and negative inputs of the instrumentation amplifier through input multiplexers on the DAQCard 1200 The instrumentation
68. ion DACs with the factory constants or the user defined constants stored in the EEPROM or perform your own calibration and directly load these constants into the calibration DACs To use the Calibrate_1200 function for analog input calibration you must ground an analog input channel at the front connector for offset calibration and apply an accurate voltage reference to another input channel for gain calibration For analog output calibration the DACO and DAC outputs must be wrapped back and applied to two other analog input channels 5 2 National Instruments Corporation Chapter 5 Calibration When you perform analog input calibration you must first configure the ADC for referenced single ended RSE mode and for the correct polarity at which you want to perform data acquisition When you perform analog output calibration you must first configure the analog input circuitry for RSE and for bipolar polarity and you must configure the analog output circuitry for the correct polarity at which you want to perform output waveform generation Refer to the NI DAQ Function Reference Manual for PC Compatibles for more details on the Calibrate_1200 function National Instruments Corporation 5 3 DAQCard 1200 User Manual Specifications Analog Input This appendix lists the specifications for the DAQCard 1200 These specifications are typical at 25 C unless otherwise noted Input Characteristics Number of channels 00 0 0
69. ip between the Programming Environment NI DAQ and Your Hardware ccccccccccesssscccesessseceecesseceeceserseeeeeeeas 1 4 Figure 2 1 A Typical Configuration for the DAQCard 1200 0 eee eeeeeeeees 2 2 National Instruments Corporation vii DAQCard 1200 User Manual Contents Figure 3 1 DAQCard 1200 I O Connector Pin Assignments eee eee eee 3 2 Figure 3 2 DAQCard 1200 Instrumentation Amplifier eee eeeeeeee 3 5 Figure 3 3 Differential Input Connections for Grounded Signal Sources 3 9 Figure 3 4 Differential Input Connections for Floating Sources ee 3 10 Figure 3 5 Single Ended Input Connections for Floating Signal Sources 3 12 Figure 3 6 Single Ended Input Connections for Grounded Signal Sources 3 13 Figure 3 7 Analog Output Signal Connections 00 0 0 eee eeeeseesee cee cneeeseeeeeneees 3 14 Figure 3 8 Digital I O Connections oo cece eeeeseeeeceeceeeeeeeeeeeseesaecaeeaeesecneeeeeees 3 16 Figure 3 9 Mode 1 Timing Specifications for Input Transfers eee 3 19 Figure 3 10 Mode 1 Timing Specifications for Output Transfers 3 20 Figure 3 11 Mode 2 Timing Specifications for Bidirectional Transfers 3 21 Figure 3 12 EXTCONV Signal Timing oo eee eeeeeeecreeseesaeceeeeseeecneeneeees 3 22 Figure 3 13 Posttrigger DAQ Timing eee ec eceseeeeeceeeeecaeesaecesesaeceenseeneensees 3 23 Figure 3 14 Pretrigger DAQ Timing 0 eee cece ceeeeeeceseeeeeeseecae
70. kao PA lt 0 7 gt Dat DATA lt 0 7 gt 8 pl A Decode PB lt 0 7 i i 4 x gt lt gt Circuitry big RD WRT 8 oO 2 82C55A t _ gt 2 PC lt 0 7 gt E gt Programmable 8 lt gt Peripheral 8 re Interface E 2 8 Pzd g g e 5 5 a lt tr 2 ic PCO Se nterrup gt Control PC3 Figure 4 6 Digital 1 0 Circuitry All three ports on the 82C55A are TTL compatible When enabled the digital output ports are capable of sinking 2 4 mA of current and sourcing 2 6 mA of current on each digital I O line When the ports are not enabled the digital I O lines act as high impedance inputs National Instruments Corporation 4 13 DAQCard 1200 User Manual Calibration This chapter discusses the calibration procedures for the DAQCard 1200 analog I O circuitry However the DAQCard 1200 is factory calibrated and National Instruments can recalibrate your card if necessary To maintain the 12 bit accuracy of the DAQCard 1200 analog input and analog output circuitry recalibrate at 6 month intervals There are two ways to perform calibrations e Use the NI DAQ Calibrate_1200 function This is the simpler method e Use your own register level writes to the calibration DACs and the EEPROM The DAQCard 1200 is software calibrated so there are no calibration trimpots The calibration process involves reading offset and gain errors from the analog input and analog output sections and writing values t
71. lassic stand alone instrument 2 a LabVIEW software module VI which consists of a front panel user interface and a block diagram program Vin volts input high Vit volts input low Vin volts in Vou volts output high VoL volts output low DAQCard 1200 User Manual G 6 National Instruments Corporation Index Numbers 5 V signal table 3 4 1200_Calibrate function 5 2 to 5 3 A ACH lt 0 7 gt signal description table 3 3 signal ranges 3 4 bipolar and unipolar analog input table 3 5 ACK signal table 3 18 AGND signal analog input signal connections 3 4 description table 3 3 AISENSE AIGND signal analog common signal 3 4 description table 3 3 amplifier characteristic specifications A 2 to A 3 analog input See also analog input modes analog input signal connections circuitry 4 6 to 4 8 configuration analog I O settings table 2 3 default settings 2 3 input modes 2 4 to 2 5 input polarity 2 3 data acquisition rates 4 9 to 4 10 maximum recommended rates table 4 10 settling time vs gain table 4 10 data acquisition timing 4 8 to 4 9 continuous data acquisition 4 8 data acquisition operation 4 8 interval data acquisition 4 9 National Instruments Corporation polarity configuration 2 3 settings table 2 3 power management modes table C 1 specifications A 1 to A 4 amplifier characteristics A 2 to A 3 dynamic characteristics A 3 input characteristics A 1 to A
72. libration Post gain error after calibration Post gain error before calibration After calibration Before calibration ccccceceeeeee Gain with gain error adjusted to 0 at gain Lo Amplifier Characteristics Input impedance Normal powered on cessceeeeeee Powered Off anirnar ai Overload senean granen es A 2 20 mV max 1 mV max 200 mV max Gain error relative to calibration reference 0 02 of reading max 2 of reading max 0 8 of reading max 100 GQ in parallel with 50 pF 4 7 k min 4 7 k min National Instruments Corporation Appendix A Specifications Input bias current eee eee 100 pA Input offset current eee 100 pA CMRR seeni a 70 dB DC to 60 Hz Dynamic Characteristics Bandwidth Small signal 3 dB Gain Bandwidth 1 10 250 kHz 20 150 kHz 50 60 kHz 100 30 kHz Settling time to full scale step Accuracy 0 024 1 LSB 10 us max 12 us typ 15 us max 25 us typ 30 us max 100 60 us typ 80 us max System noise not including quantization error Gain Dither Off Dither On 1 50 0 3 LSBrms 0 5 LSBrms 100 0 5 LSBrms 0 7 LSBrms National Instruments Corporation A 3 DAQCara 1200 User Manual Appendix A Specifications Stability Recommended warm up time 15 minutes Offset temperature coefficient Pre Sales ieee aan shes 15 uVv C P
73. n be rejected The common mode input range for the DAQCard 1200 depends on the size of the differential input signal Vai Vins Vin_ and the gain setting of the instrumentation amplifier In unipolar mode the differential input range is 0 to 10 V In bipolar mode the differential input range is 5 to 5 V Vin should remain within a range of 6 to 6 V in bipolar mode and 6 to National Instruments Corporation 3 13 DAQCard 1200 User Manual Chapter 3 Signal Connections 2 V in unipolar mode V should remain within a range of 6 to 11 V in either mode Analog Output Signal Connections Pins 10 through 12 of the front connector are the analog output signals DACOOUT AGND and DACIOUT DACOOUT is the voltage output signal for analog output channel 0 DAC1OUT is the voltage output signal for analog output channel 1 AGND is the ground reference point for both analog output channels and analog input The following output ranges are available e Output signal range Bipolar output 5 V Unipolar output 0 to 10 V Maximum load current 1 mA for 12 bit linearity per DAC Figure 3 7 shows how to make analog output signal connections Load Load VOUT 1 Front I O Connector Analog Output Channels DAQCard 1200 DAQCard 1200 User Manual Figure 3 7 Analog Output Signal Connections 3 14 National Instruments Corporation Chapter 3 Signal Conne
74. nal Connections Power Connections Pin 49 of the I O connector supplies 5 V from the DAQCard 1200 power supply This pin is referenced to DGND You can use the 5 V to power external digital circuitry e Power rating 250 mA at 5 V maximum fused to 1 A AN Warning Do not directly connect this 5 V power pin to analog or digital ground or to any other voltage source on the DAQCard 1200 or any other device Doing so can damage the DAQCard 1200 or your PC National Instruments is not liable for any damage due to incorrect power connections Pin 49 is fused for up to 1 A but should be limited to 250 mA The fuse is a thermally resettable fuse which has an internal thermostat This thermostat opens when the current exceeds 1 A and the temperature rises After some time the thermostat cools down the switch closes and the 5 V is available once more Opening this fuse does not necessarily damage the DAQCard 1200 If you do not receive 5 V check for any shorts between the 5 V power pin and ground National Instruments Corporation 3 31 DAQCard 1200 User Manual Theory of Operation This chapter explains the operation of each functional unit of the DAQCard 1200 Functional Overview The block diagram in Figure 4 1 shows a functional overview of the DAQCard 1200
75. nals are referenced to one common ground The input signals are tied to the positive input of the instrumentation amplifier and their common ground point is tied to the negative input of the instrumentation amplifier When the DAQCard 1200 is configured for single ended input NRSE or RSE eight analog input channels are available You can use single ended input connections when the following criteria are met by all input signals e Input signals are high level greater than 1 V e Leads connecting the signals to the DAQCard 1200 are less than 15 ft e All input signals share a common reference signal at the source If any of the preceding criteria is not met you should use DIFF input configuration You can software configure the DAQCard 1200 for two different types of single ended connections RSE configuration and NRSE configuration Use the RSE configuration for floating signal sources in this case the DAQCard 1200 provides the reference ground point for the external signal Use the NRSE configuration for ground referenced signal sources in this case the external signal supplies its own reference ground point and the DAQCard 1200 should not supply one Single Ended Connections for Floating Signal Sources RSE Configuration Figure 3 5 shows how to connect a floating signal source to a DAQCard 1200 configured for single ended input You must configure the DAQCard 1200 analog input circuitry for RSE input to make these types of
76. nd pulse width time lapse and frequency measurement For information about configuring the MSM82C53A see the DAQ Timing Connections section of Chapter 3 Signal Connections 2 6 National Instruments Corporation Signal Connections This chapter describes the signals on the DAQCard 1200 I O connector 1 0 Connector Figure 3 1 shows the pin assignments for the DAQCard 1200 I O connector This connector is attached to the ribbon cable that extends from the PC Card slot when the card is installed and the cable connected AN Warning Connections including power signals to ground and vice versa that exceed any of the maximum ratings of input or output signals on the DAQCard 1200 can damage the DAQCard 1200 and the PC National Instruments is nort liable for any damages resulting from any such signal connections National Instruments Corporation 3 1 DAQCard 1200 User Manual Chapter 3 Signal Connections DAQCard 1200 User Manual ACHO ACH2 ACH4 ACH6 AISENSE AIGND AGND DGND PA1 PA3 PA5 PA7 PB1 PB3 PB5 PB7 PC1 PC3 PC5 PC7 EXTUPDATE OUTBO OUTB1 CLKB1 GATB2 5 V P 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 ACH ACH3 ACH5 ACH7 DACOOUT DAC1OUT PAO PA2 PA4 PA6 PBO PB2 PB4 PB6 PCO PC2 PC4 PC6 EXTTRIG EXT
77. nei 3 11 Single Ended Connections for Grounded Signal Sources NRSE Configuration esseeeseeeeeeereeesreerseseees 3 12 Common Mode Signal Rejection Considerations 3 13 Analog Output Signal Connections eee cececeeeeeeseeeeseeceeceeeaeeeenseeeees 3 14 Digital I O Signal Connections eee eeceeeseesee ce cneceseeeeeeeseneeaes 3 15 Port C Pin Connections isitici iiien riko o rer 3 17 Timmg Specifications scss cecsissesssesesescnesdetoscsvessscesssensossevsoseesces 3 18 Mode 1 Input Timing 00 eee cee ceeceeeeseeereeeeees 3 19 Mode 1 Output Timing ee eee esee ce cneeeeensensees 3 20 Mode 2 Bidirectional Timing 0 0 eee eee ceeeeeeeeeeeeee 3 20 DAQ and General Purpose Timing Signal Connections 00 0 0 eee eee 3 22 DAQ Timing Connections 0 0 0 0 eee eceeeeeeeseecseceesseceeaececeseeseeesees 3 22 General Purpose Timing Signal Connections 0 0 0 0 eee eeeeeeeee 3 26 POWer COnMeCtiOns sisson senser eene eeen En e EER E s 3 31 Chapter 4 Theory of Operation Functional Overview vrscs ss scc cscs cssccsces ces oTo sas Tie pora EOE EEES k TEEKS EEOAE EREE ea TEEST 4 1 PC Card I O Channel Interface Circuitry eee cece ceeeeeeceeeeeeeeeeeeeecaeeeaecaeesaecseesaees 4 2 Pan 52 sss eee Se Aes a nc Re ed 4 3 Analog TPt rsen en vate dt baton AT deeusen teh woneet eine omtevie tae asserts 4 5 Analog Input Circuitry 0 0 eee ee ceeeeeceeeeeeeeseeesecaeecaecsaesaeceecnsecesesseeeeeeaeeeas 4 6 DatacACquisitvon TIMIDO oes o
78. nerating interrupts You can use the counter timers to synchronize events generate pulses and measure frequency and time The DAQCard 1200 used in conjunction National Instruments Corporation 1 1 DAQCard 1200 User Manual Chapter 1 Introduction with the PC is a versatile cost effective and portable platform for laboratory test measurement and control The DAQCard 1200 is shipped with NI DAQ a National Instruments complete DAQ driver that handles every function listed on the data sheet for our DAQ hardware Using NI DAQ you can start your application quickly and easily without having to program the card at the register level Utilities shipped with NI DAQ also can help you conserve additional power by configuring the DAQCard 1200 in the power down mode See Appendix C Power Management Modes for a description of the power management modes Detailed specifications of the DAQCard 1200 are in Appendix A Specifications What You Need to Get Started To set up and use your DAQCard 1200 you will need the following items Q DAQCard 1200 DAQCard 1200 I O cable Q Q DAQCard 1200 User Manual Q One of the following software packages and documentation LabVIEW for Macintosh LabVIEW for Windows LabWindows CVI for Windows NI DAQ for Macintosh NI DAQ for PC compatibles 0 Your computer Software Programming Choices There are several options to choose from when programming your National Ins
79. nfiguration this difference in ground potentials appears as an error in the measured voltage Figure 3 6 shows how to connect a grounded signal source to a DAQCard 1200 configured in the NRSE configuration For configuration instructions see the Analog Input Configuration section in Chapter 2 Installation and Configuration 3 12 National Instruments Corporation Chapter 3 Signal Connections Ground Referenced Signal Source Noise Common Mode 6 Q Vem 1 ACH 0 o oo 2 ACH 1 o so ACH 2 4 oS so ACH 7 f of 8 o a o Measured AISENSE AIGND Voltage 11 AGND TTT Front I O Connector DAQCard 1200 in NRSE Input Configuration 7 Figure 3 6 Single Ended Input Connections for Grounded Signal Sources Common Mode Signal Rejection Considerations Figures 3 3 and 3 6 show connections for signal sources that are already referenced to some ground point with respect to the DAQCard 1200 In these cases the instrumentation amplifier can reject any voltage caused by ground potential differences between the signal source and the DAQCard 1200 In addition with differential input connections the instrumentation amplifier can reject common mode noise pickup in the leads connecting the signal sources to the DAQCard 1200 The common mode input range of the DAQCard 1200 instrumentation amplifier is the magnitude of the greatest common mode signal that ca
80. nual Chapter 3 Signal Connections this case is triggered by a low level on the EXTUPDATE line The counter interrupt signal interrupts the PC This interrupt is generated on the rising edge of EXTUPDATE The DACWRT signal writes a new value to the DAC EXTUPDATE DAC OUTPUT UPDATE tw 50 ns min E _ foo Counter Interrupt DACWRT Figure 3 16 EXTUPDATE Signal Timing for Updating DAC Output The following rating applies to the EXTCONV EXTTRIG OUTB1 and EXTUPDATE signals e Absolute maximum voltage input rating 0 5 to 5 5 V with respect to DGND For more information concerning the various modes of data acquisition and analog output refer to your NI DAQ manual or to Chapter 4 Theory of Operation F Note You should configure both DACs in either immediate update mode or in later update mode but not in a combination of the two modes Although you can configure the DACs in a combination of modes doing so can result in glitches on the immediate update DAC if the update rate on the waveform DAC is high Please refer to the Analog Output section in Chapter 4 Theory of Operation for details on this b DAQCard 1200 User Manual ehavior General Purpose Timing Signal Connections General purpose timing signals include the GATE CLK and OUT signals for the three 82C53 B counters The 82C53 counter timers can be used for general purpose applications suc
81. o the appropriate calibration DACs to null the errors There are four calibration DACs associated with the analog input section and four calibration DACs associated with the analog output section two for each output channel After the calibration process is complete each calibration DAC is at a known value Because these values are lost when the card is powered down they are stored in the onboard EEPROM for future reference The factory information occupies one half of the EEPROM and is write protected The lower half of the EEPROM contains user areas for calibration data There are four different user areas When the DAQCard 1200 is powered on or when the conditions under which it is operating change you must load the calibration DACs with the appropriate calibration constants If you use the DAQCard 1200 with NI DAQ and LabVIEW or LabWindows CVI the factory calibration constants are automatically loaded into the calibration DAC the first time a function pertaining to the DAQCard 1200 is called and then each time you change your configuration You can instead choose to load the calibration DACs with calibration constants from the user areas in the EEPROM or you can recalibrate the DAQCard 1200 and load these constants directly into the calibration DACs National Instruments Corporation 5 1 DAQCard 1200 User Manual Chapter 5 Calibration Calibration at Higher Gains The DAQCard 1200 has a maximum gain error of 0 8 This mean
82. onfiguration is useful when measuring ground referenced signal sources Considerations in using the NRSE configuration are discussed in Chapter 3 Signal Connections Notice that in this mode the return path of the signal is through the negative terminal of the amplifier available at the connector through the pin AISENSE AIGND DIFF Input Four Channels DIFF input means that each input signal has its own reference and the difference between each signal and its reference is measured The signal and its reference are each assigned an input channel With DIFF input configuration the DAQCard 1200 can monitor four different analog input signals Considerations for using the DIFF configuration are discussed in Chapter 3 Signal Connections Notice that the signal return path is through the negative terminal of the instrumentation amplifier and through channel 1 3 5 or 7 depending on which channel pair you select Analog Output Configuration You can set the analog output on the DAQCard 1200 to either bipolar or unipolar configurations Parameter Configuration Analog Output CHO Polarity Bipolar 5 V default setting Unipolar 0 10 V Analog Output CH1 Polarity Bipolar 5 V default setting Unipolar O 10 V National Instruments Corporation 2 5 DAQCard 1200 User Manual Chapter 2 Installation and Configuration Analog Output Polarity The DAQCard 1200 has two channels of analog output volt
83. or more information FIFO size 512 samples 1 024 samples 1 024 samples Maximum single channel 83 3 K samples s 100 K samples s 100 K samples s acquisition rate Power management modes 150 mA operating 50 mA power down mode Fuse Regular 250 mA Regular 250 mA Thermal 1 0 A DAQCard 1200 User Manual B 2 National Instruments Corporation Power Management Modes This appendix describes the power management modes of the DAQCard 1200 e Normal Mode This is the normal operating mode of the DAQCard 1200 in which all the circuits are fully functional This mode draws about 150 mA from the 5 V supply about 750 mW e Power Down Mode In this mode the digital circuitry is powered on and is functional The analog input and output circuits are powered down by setting the PWRDOWN bit in the PCMCIA Card Configuration and Status Register You can set the PWRDOWN bit by using the DAQPOWER utility that is shipped with NI DAQ Use DAQPOWER D to power down and DAQPOWER U to power up the DAQCard 1200 This utility is also available in Windows and is installed whenever you install NI DAQ Typically the analog supplies are not reduced to zero negligible power is supplied to the analog circuits This mode draws about 50 mA from the 5 V supply about 250 mW Table C 1 shows the effects of different power management modes on the DAQCard 1200 circuits Table C 1 DAQCard 1200 Power
84. p 80 us max Table 4 2 DAQCard 1200 Maximum Recommended Data Acquisition Rates Sampling Acquisition Mode Gain Setting Rate Single channel 1 2 5 10 20 50 100 100 0 kS s Multiple channel 1 2 5 10 100 kS s 20 83 3 kS s 50 40 0 kS s 100 16 6 kS s The recommended data acquisition rates in Table 4 2 assume that voltage levels on all the channels included in the scan sequence are within range for the given gain and are driven by low impedance sources i Note If you use external conversions for single channel acquisitions the maximum sampling rate is 90 kS s DAQCard 1200 User Manual 4 10 National Instruments Corporation Analog Output Chapter 4 Theory of Operation The DAQCard 1200 has two channels of 12 bit D A output Each analog output channel can provide unipolar or bipolar output The DAQCard 1200 also contains timing circuitry for waveform generation timed either externally or internally Figure 4 5 shows the analog output circuitry Dat pi r gt Two s Complement z DACOWRT Data DACO m DACOOUT S 8 a 2 gt AGND c s S 3 5 2 y Internal 2 eference 3 5 Counter 4 External Update E EXTUPDATE g 8 Q 8 o lt o gt DAC1 gs DAC1OUT e S Two s Complement gt 5 rer Q o E lt a Control Q signal Dual DAC Chip z
85. phone numbers for you to use if you have trouble connecting to our Web site or if you do not have internet access NI Web Support To provide you with immediate answers and solutions 24 hours a day 365 days a year National Instruments maintains extensive online technical support resources They are available to you at no cost are updated daily and can be found in the Technical Support section of our Web site at www natinst com support Online Problem Solving and Diagnostic Resources e KnowledgeBase A searchable database containing thousands of frequently asked questions FAQs and their corresponding answers or solutions including special sections devoted to our newest products The database is updated daily in response to new customer experiences and feedback e Troubleshooting Wizards Step by step guides lead you through common problems and answer questions about our entire product line Wizards include screen shots that illustrate the steps being described and provide detailed information ranging from simple getting started instructions to advanced topics e Product Manuals A comprehensive searchable library of the latest editions of National Instruments hardware and software product manuals e Hardware Reference Database A searchable database containing brief hardware descriptions mechanical drawings and helpful images of jumper settings and connector pinouts e Application Notes A library with more than 100 shor
86. ply Indicates that the signal is active low AI Analog Input DI Digital Input DIO Digital Input Output AO Analog Output DO Digital Output N A Not Applicable The connector pins are grouped into analog input signal pins analog output signal pins digital I O signal pins timing I O signal pins and power connections Signal connection guidelines for each of these groups are described in the following sections Analog Input Signal Connections Pins through 8 are analog input signal pins for the 12 bit ADC Pin 9 AISENSE AIGND is an analog common signal You can use this pin as a signal ground connection to the DAQCard 1200 in RSE mode or as a return path in NRSE mode Pin 11 AGND is the bias current return point for differential measurements Pins through 8 are tied through 4 7 KQ series resistances to the eight single ended analog input channels of the input multiplexer Pins 2 4 6 and 8 are also tied to an input multiplexer for DIFF mode The signal ranges for inputs ACH lt 0 7 gt at all possible gains are shown in Table 3 1 Exceeding the input signal range will not damage the input circuitry as long as the maximum input voltage rating of 35 V powered on and 25 V powered off is not exceeded The DAQCard 1200 is guaranteed to withstand inputs up to the maximum input voltage rating hp Warning Exceeding the input signal range distorts input signals Exceeding the maximum input voltage rat
87. pplication In this case program the second counter for a one slot mode This configuration requires an external inverter to make the output pulse of the second counter active high 3 28 National Instruments Corporation Chapter 3 Signal Connections Signal Source 5 V 10 KQ CLK OUT GATE Gate Source Counter Dap 1 O Connector fo VV DAQCard 1200 National Instruments Corporation Figure 3 18 Frequency Measurement Application 3 29 DAQCard 1200 User Manual Chapter 3 Signal Connections Figure 3 19 shows the timing requirements for the GATE and CLK input signals and the timing specifications for the OUT output signals of the 82C53 Vv H CLK Vv gt towh Dk tow a toutg E toute tgwi towh towl tgsu gh tgwh tgwi toutg toute clock period clock high level clock low level gate setup time gate hold time gate high level gate low level output delay from clock output delay from gate 380 ns min 230 ns min 150 ns min 100 ns min 50 ns min 150 ns min 100 ns min 300 ns max 400 ns max DAQCard 1200 User Manual Figure 3 19 General Purpose Timing Signals The GATE and OUT signals in Figure 3 19 are referenced to the rising edge of the CLK signal National Instruments Corporation Chapter 3 Sig
88. ption table 3 3 digital I O signal connections 3 15 PB lt 0 7 gt signals description table 3 3 digital I O signal connections 3 15 DAQCard 1200 User Manual Index PC Card configuration D 1 T O channel interface circuitry block diagram 4 2 theory of operation 4 2 to 4 3 operation D 1 to D 2 resource conflicts D 4 resources D 2 to D 3 PC lt 0 7 gt signals description table 3 3 digital I O signal connections 3 15 physical specifications A 7 pin assignments for I O connector figure 3 2 polarity analog input 2 3 analog output 2 6 bipolar and unipolar signal range vs gain table 3 5 Port C signal assignments table 3 17 posttrigger data acquisition timing figure 3 23 posttrigger mode 3 23 power connections 3 31 power requirement specifications A 7 power management modes circuitry effects table C 1 to C 2 normal mode C 1 power down mode C 1 power on state 4 12 pretrigger data acquisition timing figure 3 24 pretrigger mode 3 23 problem solving and diagnostic resources online E 1 pulse generation 3 27 pulsewidth measurement 3 28 DAQCard 1200 User Manual l 6 R RD signal table 3 18 referenced single ended mode See RSE input register level programming 1 4 requirements for getting started 1 2 RSE input configuration 2 4 definition table 2 4 recommended input configurations table 3 7 single ended connections for floating signal sources 3 11 to 3 12 S
89. s that if the card is calibrated at a gain of 1 and if the gain is switched to 100 a maximum of 32 LSB error may result in the reading Therefore when you are recalibrating the DAQCard 1200 you should perform gain calibration at all other gains 2 5 10 20 50 and 100 and store the corresponding values in the user gain calibration data area of the EEPROM thus ensuring a maximum error of 0 02 at all gains The DAQCard 1200 is factory calibrated at all gains and NI DAQ automatically loads the correct values into the calibration DACs whenever you switch gains Calibration Equipment Requirements The equipment you use to calibrate the DAQCard 1200 should have a 0 001 rated accuracy which is 10 times as accurate as the DAQCard 1200 However calibration with only four times the accuracy as the DAQCard 1200 and a 0 003 rated accuracy is acceptable The inaccuracy of the calibration equipment results only in gain error offset error is unaffected Calibrate the DAQCard 1200 to a measurement accuracy of 0 5 LSBs which is within 0 012 of its input range For analog input calibration use a precision DC voltage source such as a calibrator with the following specifications e Voltage approximately 4 V bipolar 9 V unipolar e Accuracy 0 001 standard 0 003 acceptable Using the Calibration Function DAQCard 1200 User Manual NI DAQ contains the Calibrate_1200 function with which you can either load the calibrat
90. t There are two update modes immediate update and delayed update In immediate update mode the analog output is updated as soon as a value is written to the DAC If you select the delayed update mode a value is written to the DAC however the corresponding DAC voltage is not updated until a low level on the EXTUPDATE signal is sensed Furthermore an interrupt is generated whenever a rising edge is detected on the EXTUPDATE bit The interrupt service routine can write the next value to the DAC When the EXTUPDATE signal goes low the DAC will subsequently be updated Therefore you can perform externally timed interrupt driven waveform generation on the DAQCard 1200 Notice that the EXTUPDATE signal is level sensitive that is if you perform writes to the DAC when EXTUPDATE is low the DAC is updated immediately Also notice that when EXTUPDATE is low the signal is susceptible to noise caused by switching of other lines Because the signal is TTL compatible the lower noise margin for logical 0 can result in transitions to a logical 1 due to noise and thereby generate false interrupts Therefore the width of EXTUPDATE pulse should be as short as possible and greater than 50 ns Figure 3 16 illustrates a waveform generation timing sequence using the EXTUPDATE signal and the delayed update mode The DACs are updated by a high level on the DAC OUTPUT UPDATE signal which in National Instruments Corporation 3 25 DAQCard 1200 User Ma
91. t papers addressing specific topics such as creating and calling DLLs developing your own instrument driver software and porting applications between platforms and operating systems National Instruments Corporation E 1 DAQCard 1200 User Manual Software Related Resources e Instrument Driver Network A library with hundreds of instrument drivers for control of standalone instruments via GPIB VXI or serial interfaces You also can submit a request for a particular instrument driver if it does not already appear in the library e Example Programs Database A database with numerous non shipping example programs for National Instruments programming environments You can use them to complement the example programs that are already included with National Instruments products e Software Library A library with updates and patches to application software links to the latest versions of driver software for National Instruments hardware products and utility routines Worldwide Support National Instruments has offices located around the globe Many branch offices maintain a Web site to provide information on local services You can access these Web sites from www nat inst com worldwide If you have trouble connecting to our Web site please contact your local National Instruments office or the source from which you purchased your National Instruments product s to obtain support For telephone support in the United States dial 5
92. timing requirements for the EXTCONV input A falling edge on the EXTCONV initiates an A D conversion tw _ gt VIH EXTCONV j VA lt Ww VIL A tw 250 ns minimum A D Conversion starts within 125 ns from this point DAQCard 1200 User Manual Figure 3 12 EXTCONV Signal Timing The external control signal EXTTRIG can either start a data acquisition sequence or terminate an ongoing data acquisition sequence depending on the mode posttrigger or pretrigger These modes are software selectable 3 22 National Instruments Corporation Chapter 3 Signal Connections In the posttrigger mode EXTTRIG serves as an external trigger that initiates a data acquisition sequence When you use counter AO to time sample intervals a rising edge on EXTTRIG starts counter AO and the data acquisition sequence When you use EXTCONV to time sample intervals data acquisition is enabled on a rising edge of EXTTRIG followed by a rising edge on EXTCONV The first conversion occurs on the next falling edge of EXTCONV Further transitions on the EXTTRIG line have no effect until a new data acquisition sequence is established Figure 3 13 shows a possible controlled data acquisition sequence using EXTCONV and EXTTRIG The rising edge of EXTCONV that enables external conversions must occur a minimum of 50 ns after the rising edge of EXTTRIG The first conversion occurs on the next falling edge of EXTCONV VIH EXT
93. tive input tied to channels 1 3 5 or 7 respectively thus pairing channels 0 1 2 3 4 5 6 7 DAQCard 1200 User Manual 2 4 National Instruments Corporation While reading the following paragraphs you may find it helpful to refer to the Analog Input Signal Connections section of Chapter 3 Signal Connections which contains diagrams showing the signal paths for the three configurations These three modes are software selectable RSE Input Eight Channels Default Setting RSE input means that all input signals are referenced to a common ground point that is also tied to the DAQCard 1200 analog input ground The RSE configuration is useful for measuring floating signal sources See the Types of Signal Sources section of Chapter 3 Signal Connections for more information With the RSE configuration the DAQCard 1200 can monitor eight different analog input channels Considerations for using the RSE configuration are discussed in Chapter 3 Signal Connections Notice that in RSE mode the return path of the signal is through analog ground at the connector through the AISENSE AIGND pin Chapter 2 Installation and Configuration NRSE Input Eight Channels NRSE input means that all signals are referenced to the same common mode voltage which is allowed to float with respect to the analog ground of the DAQCard 1200 This common mode voltage is subsequently subtracted out by the instrumentation amplifier NRSE c
94. to access either of these two power management modes Refer to Appendix C Power Management Modes for more information on these modes DAQCard 1200 User Manual How do I determine if I have a memory conflict If no PC Cards are working at all it is probably because a memory window is not usable Card Services uses a 4 kB memory window for its own internal use If the memory cannot be used then Card Services cannot read the Card Information Structure CIS from the card s EPROM which means it cannot identify cards There are two different methods you can use when Card Services has a problem reading the CIS First you can determine which memory window Card Services is using and then exclude that window from use by Card Services and or the memory manager Second you can attempt to determine all of the memory that Card Services can possibly use and then exclude all but that memory from use by Card Services How do I determine all of the memory that Card Services can use One way to find out which memory addresses Card Services can use is to run a utility such as MSD EXE that scans the system and tells you how the system memory is being used For example if you run such a memory utility and it tells you that physical addresses C0000 to COFFF D 2 National Instruments Corporation National Instruments Corporation Appendix D PC Card Questions and Answers are being used for ROM access then yo
95. truments plug in DAQ and SCXI hardware You can use LabVIEW LabWindows CVI or NI DAQ DAQCard 1200 User Manual 1 2 National Instruments Corporation Chapter 1 Introduction LabVIEW and LabWindows CVI Application Software LabVIEW and LabWindows CVI are innovative program development software packages for data acquisition and control applications LabVIEW uses graphical programming whereas LabWindows CVI enhances traditional programming languages Both packages include extensive libraries for data acquisition instrument control data analysis and graphical data presentation LabVIEW features interactive graphics a state of the art user interface and a powerful graphical programming language The LabVIEW Data Acquisition VI Library a series of VIs for using LabVIEW with National Instruments boards is included with LabVIEW The LabVIEW Data Acquisition VI Libraries are functionally equivalent to the NI DAQ software LabWindows CVI features interactive graphics and a state of the art user interface and uses the ANSI standard C programming language The LabWindows CVI Data Acquisition Library a series of functions for using LabWindows CVI with National Instruments boards is included with your NI DAQ software kit The LabWindows CVI Data Acquisition libraries are functionally equivalent to the NI DAQ software Using LabVIEW or LabWindows CVI software will greatly reduce the development time for your data acquisition and control appli
96. ts outside reasonable control Copyright Under the copyright laws this publication may not be reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation Trademarks CVI DAQCard DAQPad LabVIEW nat inst com National Instruments NI DAQ and RTSI are trademarks of National Instruments Corporation Product and company names mentioned herein are trademarks or trade names of their respective companies WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS 1 NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN 2 IN ANY APPLICATION INCLUDING THE ABOVE RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS CAN BE IMPAIRED BY ADVERSE FACTORS INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL POWER SUPPLY COMPUTER HARDWARE MALFUNCTIONS COMPUTER OPERATING SYSTEM SOFTWARE FITNESS FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION INSTALLATION ERRORS SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS MALFUNCTIONS OR FAILURES OF ELECTRONIC MONITORING OR
97. u know that C8000 D3FFF is an invalid range for Card Services and should be changed to CA000 D3FFF How can I find usable I O addresses Finding usable I O addresses is done by trial and error Of the three resources used memory I O interrupts I O conflicts will be low You can use either DAQCONF EXE in DOS or WDAQCONF in Windows to diagnose I O space conflicts When you have configured DAQCONF or WDAQCONF for a particular I O space save the configuration If there is a conflict the configuration utility will report an error describing the conflict How do I find usable interrupt levels Some utilities such as MSD EXE will scan the system and display information about what is using hardware interrupts If you have such a utility you can run it to determine what interrupts Card Services can use Card Services needs an interrupt for itself as well as one interrupt for each PC Card socket in the system For example in a system with two PC Card sockets at least three interrupts should be allocated for use by Card Services Keep in mind that utilities such as MSD EXE will sometimes report that an interrupt is in use when it really is not For example if the computer has one serial port COM1 and one parallel port LPT1 you know that IRQs 4 and 7 are probably in use In general IRQ5 is used for LPT2 but if the computer does not have two parallel ports IRQ5 should be usable IRQ3 is used for CO
98. ual LabVIEW PC7 PC6 PCS PC4 PC3 PC2 PC1 PCO Mode 0 No T O T O T O T O T O T O T O T O Basic I O Handshaking Mode 1 Handshaking T O T O IBF STB INTR STBg IBFBg INTRg Strobed Input Mode 1 Handshaking OBF ACK T O T O INTR ACKg OBFg INTRg Strobed Output Mode 2 Handshaking OBF ACK IBF STB INTR T O T O T O Bidirectional Bus Indicates that the signal is active low Subscripts A and B denote port A or port B handshaking signals National Instruments Corporation 3 17 DAQCard 1200 User Manual Chapter 3 Signal Connections Timing Specifications Use the handshaking lines STB and IBF to synchronize input transfers Use the handshaking lines OBF and ACK to synchronize output transfers The following signals are used in the timing diagrams shown later in this chapter Name Type Description STB Input Strobe Input A low signal on this handshaking line loads data into the input latch IBF Output Input Buffer Full A high signal on this handshaking line indicates that data has been loaded into the input latch This is primarily an input acknowledge signal ACK Input Acknowledge Input A low signal on this handshaking line indicates that the data written from the specified port has been accepted This signal is primarily a response from the external device that it has received the data from the DAQCard 1200 OBF Output Output Buffer Full A lo
99. uments if errors are suspected In no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NATIONAL INSTRUMENTS MAKES NO WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CUSTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA PROFITS USE OF PRODUCTS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty provided herein does not cover damages defects malfunctions or service failures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other even
100. urce category Ground Referenced Signal Sources A ground referenced signal source is connected in some way to the building system ground and is therefore already connected to a common ground point with respect to the DAQCard 1200 assuming that the PC is plugged into the same power system Nonisolated outputs of instruments and devices that plug into the building power system fall into this category 3 6 National Instruments Corporation Chapter 3 Signal Connections The difference in ground potential between two instruments connected to the same building power system is typically between mV and 100 mV but can be much higher if power distribution circuits are not properly connected The connection instructions that follow for grounded signal sources eliminate this ground potential difference from the measured signal CF Note If you power both the DAQCard 1200 and your PC with a floating power source such as a battery your system may be floating with respect to earth ground In this case treat all of your signal sources as floating sources Input Configurations You can configure the DAQCard 1200 for one of three input modes RSE NRSE or DIFF The following sections discuss the use of single ended and differential measurements and considerations for measuring both floating and ground referenced signal sources Table 3 2 summarizes the recommended input configurations for both types of signal sources Table 3 2 Recommended Inp
101. ustry Standard Architecture light emitting diode least significant bit megabytes of memory most significant bit not connected signal nonreferenced single ended mode all measurements are made with respect to a common NRSE measurement system reference but the voltage at this reference can vary with respect to the measurement system ground G 4 National Instruments Corporation OUT P PCMCIA PPI RMA rms SCXI TTL Glossary output signal an expansion bus architecture that has found widespread acceptance as a de facto standard in notebook size computers It originated as a specification for add on memory cards written by the Personal Computer Memory Card International Association programmable peripheral interface random access memory Return Material Authorization root mean square samples seconds Signal Conditioning eXtensions for Instrumentation the National Instruments product line for conditioning low level signals within an external chassis near sensors so only high level signals are sent to DAQ boards in the noisy PC environment transistor transistor logic National Instruments Corporation G 5 DAQCard 1200 User Manual Glossary V V volts VCC positive supply voltage from the PCMCIA bus usually 5V Voc volts direct current VI virtual instrument 1 a combination of hardware and or software elements typically used with a PC that has the functionality of a c
102. ut Configurations for Ground Referenced and Floating Signal Sources Type of Signal Recommended Input Configuration Ground Referenced DIFF nonisolated outputs plug in instruments NRSE Floating DIFF with bias resistors batteries thermocouples isolated outputs RSE Differential Connection Considerations DIFF Configuration Differential connections are those in which each DAQCard 1200 analog input signal has its own reference signal or signal return path These connections are available when you configure the DAQCard 1200 in the DIFF mode Each input signal is tied to the positive input of the instrumentation amplifier and its reference signal or return is tied to the negative input of the instrumentation amplifier National Instruments Corporation 3 7 DAQCard 1200 User Manual Chapter 3 Signal Connections DAQCard 1200 User Manual When you configure the DAQCard 1200 for DIFF input each signal uses two of the multiplexer inputs one for the signal and one for its reference signal Therefore only four analog input channels are available when using the DIFF configuration You should use the DIFF input configuration when any of the following conditions is present e Input signals are low level less than 1 V e Leads connecting the signals to the DAQCard 1200 are greater than 15 ft e Any of the input signals requires a separate ground reference point or return signal e The signal leads travel
103. w signal on this handshaking line indicates that data has been written from the specified port INTR Output Interrupt Request This signal becomes high when the 82C55A requests service during a data transfer Set the appropriate interrupt enable signals to generate this signal RD Internal Read This signal is the read signal generated from the parallel port interface circuitry WRT Internal Write This signal is the write signal generated from the parallel port interface circuitry DATA Bidirectional Data Lines at the Specified Port This signal indicates when the data on the data lines at a specified port is or should be available DAQCard 1200 User Manual 3 18 National Instruments Corporation Mode 1 Input Timing Chapter 3 Signal Connections Figure 3 9 shows the timing specifications for an input transfer in mode 1 T1 A T2 T4 m lt gt STB T7 IBF T6 INTR RD Al DATA Name Description Minimum Maximum T1 STB pulse width 100 T2 STB 0 to IBF 1 150 T3 Data before STB 1 20 T4 STB 1 to INTR 1 150 T5 Data after STB 1 50 T6 RD 0 to INTR 0 200 T7 RD 1 to IBF 0 150 All timing values are in nanoseconds National Instruments Corporation Figure 3 9 Mode 1 Timing Specifications for Input Transfers DAQCard 1200 User Manual Chapter 3 Signal Conn
104. xt denotes a note which alerts you to important information This icon to the left of bold italicized text denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash This icon to the left of bold italicized text denotes a warning which advises you of precautions to take to avoid being electrically shocked Bold italic text denotes an activity objective note caution or warning Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text from which you supply the appropriate word or value as in NI DAQ 6 x Text in this font denotes text or characters that you should literally enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables file names and extensions and for statements and comments taken from programs NI DAQ is used in this manual to refer to the NI DAQ software for PC compatibles unless otherwise stated PC refers to the IBM PC XT PC AT Personal System 2 and laptop compatible computers which are equipped with a Type II 5 V capable slot and a PCMCIA standard version 2 0 or later bus interface X National Instruments Corporation About This Manual National Instruments Documentation The DAQCard 1200 User Manual

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