National Instruments 320174B-01 - Manuals

Contents © National Instruments Corporation ix Lab-NB User Manual Figures Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware ............................................................................................................ 1-3 Figure 2-1. Parts Loc...

Contents Lab-NB User Manual x © National Instruments Corporation Table 4-4. Bipolar Input Mode A/D Conversion Values (Two’s Complement Coding) .... 4-38Table 4-5. Analog Output Voltage Versus Digital Code .................................................... 4-53Table 4-6. Analog Output Voltage Versu...

© National Instruments Corporation xi Lab-NB User Manual About This Manual This manual describes the mechanical and electrical aspects of the Lab-NB and containsinformation concerning its installation and operation. The Lab-NB is a low-cost multifunctionanalog, digital, and timing I/O board for Maci...

About This Manual Lab-NB User Manual xii © National Instruments Corporations • The Glossary contains an alphabetical list and description of terms used in this manual,including abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms. • The Index alphabetically lists topics covered in...

About This Manual © National Instruments Corporation xiii Lab-NB User Manual • Your DAQ hardware user manuals—These manuals have detailed information about theDAQ hardware that plugs into or is connected to your computer. Use these manuals forhardware installation and configuration instructions, spe...

© National Instruments Corporation 1-1 Lab-NB User Manual Chapter 1Introduction This chapter describes the Lab-NB, lists what you need to get started, software programmingchoices, optional equipment, and explains how to unpack the Lab-NB. About the Lab-NB Thank you for buying the National Instrument...

Introduction Chapter 1 Lab-NB User Manual 1-2 © National Instruments Corporation What You Need to Get Started To set up and use your Lab-NB board, you will need the following: Lab-NB board Lab-NB User Manual One of the following software packages and documentation: NI-DAQ software for MacintoshLabVI...

Chapter 1 Introduction © National Instruments Corporation 1-3 Lab-NB User Manual NI-DAQ Driver Software The NI-DAQ driver software is included at no charge with all National Instruments DAQhardware. NI-DAQ is not packaged with SCXI or accessory products, except for the SCXI-1200.NI-DAQ has an extens...

Introduction Chapter 1 Lab-NB User Manual 1-4 © National Instruments Corporation 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 andinefficien...

Chapter 1 Introduction © National Instruments Corporation 1-5 Lab-NB User Manual The Lab-NB I/O connector is a 50-pin male ribbon cable header. The manufacturer partnumbers used by National Instruments for this header are as follows: • Electronic Products Division/3M (part number 3596-5002) • T&...

© National Instruments Corporation 2-1 Lab-NB User Manual Chapter 2Configuration and Installation This chapter describes how to configure and install the Lab-NB into your Macintosh computer,and also includes signal connections to the Lab-NB and cable wiring. Board Configuration The Lab-NB contains t...

Chapter 2 Configuration and Installation © National Instruments Corporation 2-3 Lab-NB User Manual Factory Default Jumper Settings The Lab-NB is shipped from the factory with the following configuration: • Jumpers W1 and W2–bipolar analog output • Jumper W3–bipolar analog input Table 2-1 lists all t...

Configuration and Installation Chapter 2 Lab-NB User Manual 2-4 © National Instruments Corporation W2 A B C W1 Channel 1 Channel 0 A B C Figure 2-2. Bipolar Output Jumper Configuration Unipolar Output Selection You can select the unipolar (0 to 10 V) output configuration for either analog output cha...

Chapter 2 Configuration and Installation © National Instruments Corporation 2-5 Lab-NB User Manual W3 A B C Figure 2-4. Bipolar Input Jumper Configuration Unipolar Input Selection You can select the unipolar (0 to 10 V) input configuration by setting the following jumper: Analog Input W3 B-C This co...

Configuration and Installation Chapter 2 Lab-NB User Manual 2-6 © National Instruments Corporation Warning: Connections that exceed any of the maximum ratings of input or output signals on the Lab-NB may result in damage to the Lab-NB board and to the Macintoshcomputer. This includes connecting any ...

Chapter 2 Configuration and Installation © National Instruments Corporation 2-7 Lab-NB User Manual Signal Connection Descriptions Pin Signal Name Description 1-8 ACH<0..7> Analog input channels 0 through 7 (single-ended). 9 AIGND Analog input ground. 10 DAC0 OUT Voltage output signal for analo...

Configuration and Installation Chapter 2 Lab-NB User Manual 2-8 © National Instruments Corporation cause conversions to occur; it cannot be used as a monitor to detect conversions caused by theonboard sample-interval timer. The following input ranges and maximum ratings apply to inputs ACH<0..7&g...

Chapter 2 Configuration and Installation © National Instruments Corporation 2-9 Lab-NB User Manual Analog Output Signal Connections Pins 10 through 12 of the I/O connector are analog output signal pins. Pins 10 and 12 are the DAC0 OUT and DAC1 OUT signal pins. DAC0 OUT is the voltageoutput signal fo...

Configuration and Installation Chapter 2 Lab-NB User Manual 2-10 © National Instruments Corporation Digital I/O Signal Connections Pins 13 through 37 of the I/O connector are digital I/O signal pins. Digital I/O on the Lab-NB isdesigned around the 82C55A integrated circuit. The 82C55A is a general-p...

Chapter 2 Configuration and Installation © National Instruments Corporation 2-11 Lab-NB User Manual Figure 2-9 illustrates signal connections for three typical digital I/O applications. 14 PA0 22 PB0 30 PC0 13 DGND Lab-NB Board Switch I/O Connector +5 V +5 V LED TTL Signal Port B PB<7..0> Port...

Configuration and Installation Chapter 2 Lab-NB User Manual 2-12 © National Instruments Corporation Table 2-2. Port C Signal Assignments Programming Mode Group A Group B PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 Mode 0 I/O I/O I/O I/O I/O I/O I/O I/O Mode 1 Input I/O I/O IBF A STB A * INTR A STB B * IBFB B IN...

Configuration and Installation Chapter 2 © National Instruments Corporation 2-14 Lab-NB User Manual Mode 1 Input Timing The following figure illustrates the timing specifications for an input transfer in mode 1. DATA RD * INTR IBF STB * T1 T2 T4 T7 T6 T3 T5 Name Description Minimum Maximum T1 STB* p...

Chapter 2 Configuration and Installation © National Instruments Corporation 2-15 Lab-NB User Manual Mode 1 Output Timing The following figure illustrates the timing specifications for an output transfer in mode 1. WR* OBF* INTR ACK* DATA T1 T2 T3 T4 T5 T6 Name Description Minimum Maximum T1 WR* = 0 ...

Configuration and Installation Chapter 2 Lab-NB User Manual 2-16 © National Instruments Corporation Mode 2 Bidirectional Timing The following figure illustrates the timing specifications for bidirectional transfers in mode 2. T1 T6 T7 T3 T4 T10 T2 T5 T8 T9 WR * OBF * INTR ACK * STB * IBF RD * DATA N...

Chapter 2 Configuration and Installation © National Instruments Corporation 2-17 Lab-NB User Manual Timing Connections Pins 38 through 48 of the I/O connector are connections for timing I/O signals. The timing I/O ofthe Lab-NB is designed around the 8253 Counter/Timer integrated circuit. Two of thes...

Configuration and Installation Chapter 2 Lab-NB User Manual 2-20 © National Instruments Corporation text Minimum 50 nsec EXTUPDATE* DAC OUTPUT UPDATE TMRINTUP DACWRT text Figure 2-14. Waveform Generation Timing with the EXTUPDATE* Signal Since a rising edge on the EXTUPDATE* signal always sets the T...

© National Instruments Corporation 3-1 Lab-NB User Manual Chapter 3Theory of Operation This chapter contains a functional overview of the Lab-NB and explains the operation of eachfunctional unit making up the Lab-NB. Functional Overview The block diagram in Figure 3-1 shows a functional overview of ...

Theory of Operation Chapter 3 Lab-NB User Manual 3-2 © National Instruments Corporation The following are the major components making up the Lab-NB board: • NuBus interface circuitry • Analog input and DAQ circuitry • Analog output circuitry • Digital I/O circuitry • Timing I/O circuitry DAQ functio...

Chapter 3 Theory of Operation © National Instruments Corporation 3-3 Lab-NB User Manual The starting-address-detecting circuitry on the Lab-NB matches address lines 23 through 21 tothe starting address specified by the slot in which the Lab-NB board is installed. The remainingaddress lines (19 throu...

Theory of Operation Chapter 3 Lab-NB User Manual 3-4 © National Instruments Corporation Analog Input Circuitry The analog input circuitry consists of an input multiplexer, a software-programmable gainamplifier, a 12-bit ADC, and a 12-bit FIFO memory that is sign-extended to 16 bits. The input multip...

Chapter 3 Theory of Operation © National Instruments Corporation 3-5 Lab-NB User Manual multichannel (scanned) data acquisition. Scanned data acquisition uses a counter toautomatically switch between analog input channels during data acquisition. DAQ timing consists of signals that initiate a DAQ op...

Theory of Operation Chapter 3 Lab-NB User Manual 3-6 © National Instruments Corporation DAQ Rates Maximum DAQ rates (number of samples per second) are determined by the conversion periodof the ADC plus the sample-and-hold acquisition time. During multichannel scanning, the DAQrates are further limit...

Chapter 3 Theory of Operation © National Instruments Corporation 3-7 Lab-NB User Manual The recommended DAQ rates given in Table 3-2 assume that voltage levels on all the channelsincluded in the scan sequence are within range for the given gain and are driven by low-impedance sources. The signal ran...

Theory of Operation Chapter 3 Lab-NB User Manual 3-8 © National Instruments Corporation DAC0 DAC1 DAC Configuration Register Ref Coding Coding Ref DAC0 OUT AGND DAC1 OUT EXTUPDATE* 5 V Internal Reference DAC0WR Data DAC1WR Counter A2 CNFGWR TWOSDA0 TMRWGN1 TWOSDA1 TMRWGN0 TWOSDA0 TWOSDA1 12 I/O Conn...

Chapter 3 Theory of Operation © National Instruments Corporation 3-9 Lab-NB User Manual corresponding to an LSB change in the digital code word. For both unipolar and bipolar output,one LSB corresponds to the following formula: 10 V 4, 096 Digital I/O Circuitry The digital I/O circuitry is designed ...

© National Instruments Corporation 4-1 Lab-NB User Manual Chapter 4Register-Level Programming This chapter describes in detail the address and function of each of the Lab-NB control and statusregisters. This chapter also includes important information about register-level programming theLab-NB. Note...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-2 © National Instruments Corporation Table 4-1. Macintosh Slot Addresses Slot Number Starting Address (Hex) Ending Address (Hex) 24-Bit Mode 9 0090 0000 009F FFFF A 00A0 0000 00AF FFFF B 00B0 0000 00BF FFFF C 00C0 0000 00CF FFFF D 00D0 0000 0...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-3 Lab-NB User Manual Table 4-2. Lab-NB Register Map Offset Register Name Address (Hex) Type Size Analog Input Register Group A/D Configuration Register 0 8000 Write-only 16-bit Status Register 0 8000 Read-only 8-bit A/D FIFO R...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-4 © National Instruments Corporation Register Sizes The Macintosh permits three different memory word sizes for memory read and writeoperations–byte (8-bit), half-word (16-bit), and word (32-bit). Table 4-2 shows the word sizes ofthe Lab-NB r...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-5 Lab-NB User Manual Analog Input Register Group The four registers making up the Analog Input Register Group control the analog input circuitryand are used for reading from the A/D FIFO. The A/D Configuration Register selects...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-6 © National Instruments Corporation A/D Configuration Register The A/D Configuration Register indicates the input channel to be read and the gain for theanalog input circuitry. Address: Base address + 0 8000 (hex) Type: Write-only Word Size:...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-7 Lab-NB User Manual Bit Name Description (continued) 8 PRETRIG Pretrigger Bit—This bit is used to set the pretriggering feature onthe Lab-NB. It also supersedes any setting in the EXTTRIGEN bitdescribed earlier. If PRETRIG is...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-8 © National Instruments Corporation Bit Name Description (continued) Channel Scanning later in this chapter for the correct sequenceinvolved in setting the SCANEN bit. 3–1 GAIN<2..0> Gain Bit—These three bits select the gain setting as...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-9 Lab-NB User Manual Status Register The Status Register indicates the status of the current A/D conversion. The bits in this registerdetermine if a conversion is being performed or if data is available and any errors have bee...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-10 © National Instruments Corporation A/D FIFO Register Reading the A/D FIFO Register returns the next A/D conversion value stored in the A/D FIFO.Whenever the A/D FIFO Register is read, the value read is removed from the A/D FIFO, therebyfre...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-11 Lab-NB User Manual A/D FIFO Register (continued) Bit Map: Two’s complement binary mode 15 14 13 12 11 10 9 8 Sign Extension Bits D11 D10 D9 D8 7 6 5 4 3 2 1 0 D7 D6 D5 D4 D3 D2 D1 D0 Bit Name Description 15– 0 D<15..0>...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-12 © National Instruments Corporation A/D Clear Register The ADC can be reset by writing to this register. This operation clears the FIFO and loads thelast conversion value into the FIFO. All error bits in the Status Register are cleared as w...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-13 Lab-NB User Manual Analog Output Register Group The four registers making up the Analog Output Register Group are used for loading the two12-bit DACs in the two analog output channels. DAC0 controls analog output channel 0....

Register-Level Programming Chapter 4 Lab-NB User Manual 4-14 © National Instruments Corporation DAC Configuration Register This register determines if data written to the DACs is in straight binary or two’s complementform. It also configures the DACs to output data automatically at a rate controlled...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-15 Lab-NB User Manual DAC0 and DAC1 Data Registers Writing to these registers loads the corresponding analog output channel DAC, thereby updatingthe voltages generated by the analog output channels. The voltage is updated imme...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-16 © National Instruments Corporation 8253 Counter/Timer Register Groups The eight registers making up the two Counter/Timer Register Groups access the two onboard8253 Counter/Timers. Each 8253 has three counters. For convenience, the two Cou...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-17 Lab-NB User Manual Counter A0 Data Register The Counter A0 Data Register is used for loading and reading back contents of 8253(A)counter 0. Address: Base address + 4 0000 (hex) Type: Read-and-write Word Size: 8-bit Bit Map:...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-18 © National Instruments Corporation Counter A1 Data Register The Counter A1 Data Register is used for loading and reading back contents of 8253(A)counter 1. Address: Base address + 4 0010 (hex) Type: Read-and-write Word Size: 8-bit Bit Map:...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-19 Lab-NB User Manual Counter A2 Data Register The Counter A2 Data Register is used for loading and reading back contents of 8253(A)counter A2. Address: Base address + 4 0020 (hex) Type: Read-and-write Word Size: 8-bit Bit Map...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-20 © National Instruments Corporation Counter A Mode Register The Counter A Mode Register determines the operation mode for each of the three counters onthe 8253(A) chip. The Counter A Mode Register selects the counter involved, its read/load...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-21 Lab-NB User Manual Counter B0 Data Register The Counter B0 Data Register is used for loading and reading back the contents of 8253(B)counter 0. Address: Base address + 4 8000 (hex) Type: Read-and-write Word Size: 8-bit Bit ...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-22 © National Instruments Corporation Counter B1 Data Register The Counter B1 Data Register is used for loading and reading back the contents of 8253(B)counter 1. Address: Base address + 4 8010 (hex) Type: Read-and-write Word Size: 8-bit Bit ...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-23 Lab-NB User Manual Counter B2 Data Register The Counter B2 Data Register is used for loading and reading back the contents of 8253(B)counter 2. Address: Base address + 4 8020 (hex) Type: Read-and-write Word Size: 8-bit Bit ...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-24 © National Instruments Corporation Counter B Mode Register The Counter B Mode Register determines the operation mode for each of the three counters onthe 8253(B) chip. The Counter B Mode Register selects the counter involved, its read/load...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-25 Lab-NB User Manual 82C55A Digital I/O Register Group Digital I/O on the Lab-NB uses an 82C55A integrated circuit. The 82C55A is a general-purposePPI containing 24 programmable I/O pins. These pins represent the three 8-bit ...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-26 © National Instruments Corporation Port A Register Reading the Port A Register returns the logic state of the eight digital I/O lines constitutingport A, that is, PA<0..7>. If port A is configured for output, the Port A Register can ...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-27 Lab-NB User Manual Port B Register Reading the Port B Register returns the logic state of the eight digital I/O lines constituting portB, that is, PB<0..7>. If port B is configured for output, the Port B Register can ...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-28 © National Instruments Corporation Port C Register Port C is special in the sense that it can be used as an 8-bit I/O port like port A and port B ifneither port A nor port B is used in handshaking (latched) mode. If either port A or port B...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-29 Lab-NB User Manual Digital Control Register The Digital Control Register can be used to configure port A, port B, and port C as inputs oroutputs as well as selecting simple mode (basic I/O) or handshaking mode (strobed I/O)...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-30 © National Instruments Corporation Interrupt Control Register Group This group is made up of two registers. Writing to the Interrupt Control Register enables theinterrupt facility on the Lab-NB. The Interrupt Status Register contains infor...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-31 Lab-NB User Manual Interrupt Control Register Setting bits of this register causes an interrupt to occur when the current process is complete. Address: Base address + 1 0000 (hex) Type: Write-only Word Size: 8-bit Bit Map: ...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-32 © National Instruments Corporation Bit Name Description (continued) the Timer Interrupt Clear Register. This interrupt allows waveformgeneration on the analog output because the same signal that setsthe interrupt also updates the DAC outpu...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-33 Lab-NB User Manual Interrupt Status Register The Interrupt Status Register indicates the status of the Interrupt Control Register bits and theinterrupt lines. Address: Base address + 1 0000 (hex) Type: Read-only Word Size: ...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-34 © National Instruments Corporation Timer Interrupt Clear Register Writing to the Timer Interrupt Clear Register clears the TIMERUP bit in the Interrupt StatusRegister. The Timer Interrupt Clear Register can be used to service any timer-rel...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-35 Lab-NB User Manual Configuration EPROM The Configuration EPROM is an onboard read-only memory that contains information requiredby the Macintosh operating system. The Macintosh system Slot Manager reads theConfiguration EPR...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-36 © National Instruments Corporation 4. Write 0000 (hex) to the A/D Configuration Register (16-bit write). 5. Write 00 (hex) to the A/D Clear Register (8-bit write). 6. Read the data from the A/D FIFO Register (16-bit read). Ignore the data....

Chapter 4 Register-Level Programming © National Instruments Corporation 4-37 Lab-NB User Manual 1. Select analog input channel and gain. The analog input channel and gain are selected by writing to the A/D Configuration Register.See the A/D Configuration Register bit description earlier in this chap...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-38 © National Instruments Corporation used for A/D timing, the DAVAIL bit should be set after 12 msec or after a rising edge inEXTCONV*, whichever occurs later. An A/D FIFO overflow condition occurs if more than 16 conversions are initiated a...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-39 Lab-NB User Manual Clearing the Analog Input Circuitry The analog input circuitry can be cleared by writing to the A/D Clear Register, which leaves theanalog input circuitry in the following state: • Analog input error flag...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-40 © National Instruments Corporation Programming in Controlled Acquisition Mode The following programming steps are required for a DAQ operation in controlled acquisitionmode: 1. Select analog input channel, gain, and timebase source for cou...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-41 Lab-NB User Manual 3. Program counters A0 and A1. This step involves programming counter A0 to generate periodic conversion pulses andprogramming counter A1 to interrupt on terminal count mode (mode 0). Counter A0 of the 82...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-42 © National Instruments Corporation Use the following programming sequence to program the sample-interval counter. All writes are8-bit write operations. All values given are hexadecimal. a. Write 34 to the Counter A Mode Register (select co...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-43 Lab-NB User Manual Programming in Freerun Acquisition Mode Freerun acquisition mode uses only counter A0 as the sample-interval counter. The number ofA/D conversions that have occurred (that is, the sample count) is maintai...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-44 © National Instruments Corporation c. Write the most significant byte of the timebase count to the Counter B Data Register. For example, programming a timebase of 10 µsec requires a timebase count of 10 µsec 0.5 µsec = 20 µsec 3. Program c...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-45 Lab-NB User Manual 7. Service the DAQ operation. Once the DAQ operation is started by writing the most significant byte of the sample interval tothe Counter A0 Data Register, the operation must be serviced by reading the A/...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-46 © National Instruments Corporation Using the EXTTRIG Signal to Terminate a Multiple A/D Conversion DAQ Operation(Pretrigger Mode) If the PRETRIG bit is set in the ADC Command Register, EXTTRIG functions as a stop triggerfor a multiple A/D ...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-47 Lab-NB User Manual 4. Clear the A/D circuitry. 5. Program counter A1 and enable EXTCONV* and EXTTRIG input. 6. Service the DAQ operation. Each of these programming steps is explained as follows. 1. Disable EXTCONV* and EXTT...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-48 © National Instruments Corporation To program the counters, use the following programming sequence: a. Write 70 (hex) to the Counter A Mode Register (select counter A1, mode 0). This step sets the output of counter A1 (OUTA1) low, which in...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-49 Lab-NB User Manual Pretrigger Mode The following programming steps are required for a DAQ operation in controlled acquisitionmode using EXTCONV*. In the following programming sequence, EXTTRIG is used as apretrigger signal;...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-50 © National Instruments Corporation 4. Clear the A/D circuitry. Before the DAQ operation is started, the A/D FIFO must be emptied in order to clear any oldA/D conversion results. Empty the A/D FIFO after the counters are programmed becausep...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-51 Lab-NB User Manual Two error conditions may occur during a DAQ operation: an overflow error or an overrun error.These error conditions are reported through the Status Register and should be checked every timethe Status Regi...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-52 © National Instruments Corporation channel 3, channel 2, channel 1, channel 0, channel 3, channel 2, channel 1, channel 0,channel 3, and so on. Note: Select the analog input channel and gain in the following order: 1. Write the configurati...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-53 Lab-NB User Manual by jumper settings described in Chapter 2, Configuration and Installation. Table 4-5 shows theoutput voltage versus digital code for a unipolar analog output configuration. Table 4-6 showsthe voltage vers...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-54 © National Instruments Corporation Table 4-6. Analog Output Voltage Versus Digital Code (Bipolar Mode, Two’s Complement Coding) Digital Code Voltage Output (Decimal) (Hex) (V ref = 10 V) -2,048 F800 -5.0 V -1,024 FC00 -2.5 V 0 0000 0.0 V 1...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-55 Lab-NB User Manual 3. Install an interrupt service routine. You must install an interrupt service routine for the slot containing the Lab-NB. Consult theInside Macintosh manual for information regarding the installation of ...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-57 Lab-NB User Manual Register Descriptions and Programming Examples The following figures show the two control-word formats used to completely program the82C55A. The control-word flag determines which control-word format is b...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-59 Lab-NB User Manual Example 2. Configure port A for input, port B and port C for output: • Write 90 (hex) to the Digital Control Register. • Write 8-bit data to port B or port C. Read 8-bit data from port A as appropriate. E...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-62 © National Instruments Corporation Port C status-word bit definitions for output (port A and port B): 7 6 5 4 3 2 1 0 OBFA* INTEA I/O I/O INTRA INTEB* OBFB INTRB Bit Name Description 7 OBFA* Output Buffer Full for Port A—Low indicates that...

Register-Level Programming Chapter 4 Lab-NB User Manual 4-64 © National Instruments Corporation Port C status-word bit definitions for bidirectional data path (port A only): 7 6 5 4 3 2 1 0 OBFA* INTE1 IBFA INTE2 INTRA I/O I/O I/O Bit Name Description 7 OBFA* Output Buffer Full—Low indicates that th...

Chapter 4 Register-Level Programming © National Instruments Corporation 4-65 Lab-NB User Manual Mode 2 Programming Example Example 1. Configure port A in mode 2: • Write C0 (hex) to the Digital Control Register. • Wait for bit 7 of port C (OBFA*) to be cleared, indicating that the data last written ...

© National Instruments Corporation 5-1 Lab-NB User Manual Chapter 5Calibration This chapter discusses the calibration procedures for the Lab-NB analog input and analog outputcircuitry. The Lab-NB is calibrated at the factory before shipment. To maintain the 12-bit accuracy of theLab-NB analog input ...

Calibration Chapter 5 Lab-NB User Manual 5-2 © National Instruments Corporation Calibration Trimpots The Lab-NB has six trimpots for calibration. The location of these trimpots on the Lab-NBboard is shown in the partial diagram of the board in Figure 5-1. 1 2 3 4 5 1 R6 2 R7 3 R8 4 R9 5 R10 6 R1 Fig...

Chapter 5 Calibration © National Instruments Corporation 5-3 Lab-NB User Manual Analog Input Calibration To null out error sources that compromise the quality of measurements, you must calibrate theanalog input circuitry by adjusting the following potential sources of error: • Offset errors • Gain e...

Calibration Chapter 5 Lab-NB User Manual 5-4 © National Instruments Corporation Input Range V -fs V +fs - 1 1 LSB 0.5 LSB -5 to +5 V -5 V +4.99756 V 2.44 mV 1.22 mV 0 to 10 V 0 V +9.99756 V 2.44 mV 1.22 mV Board Configuration The calibration procedure differs if you select either bipolar or unipolar...

Chapter 5 Calibration © National Instruments Corporation 5-5 Lab-NB User Manual b. Take analog input readings from channel 0 at a gain of 1, and adjust trimpot R10 until the ADC readings flicker evenly between 2,046 and 2,047. Alternatively, you can average anumber of readings (approximately 100) an...

Calibration Chapter 5 Lab-NB User Manual 5-6 © National Instruments Corporation Offset error in the analog output circuitry is the total of the voltage offsets contributed by eachcomponent in the circuitry. This error appears as a voltage difference between the desiredvoltage and the actual output v...

Chapter 5 Calibration © National Instruments Corporation 5-7 Lab-NB User Manual c. Adjust trimpot R9 until the output voltage read is -5 V.2. Adjust the Analog Output Gain Adjust the analog output gain by measuring the output voltage generated with the DAC set atpositive full-scale (4,095). This out...

Calibration Chapter 5 Lab-NB User Manual 5-8 © National Instruments Corporation For analog output channel 1: a. Connect the voltmeter between DAC1 OUT (pin 12 on the I/O connector) and AOGND (pin 11). b. Set the analog output channel to 0 V by writing 0 to the DAC. c. Adjust trimpot R9 until the out...

© National Instruments Corporation A-1 Lab-NB User Manual Appendix ASpecifications This appendix lists the specifications of the Lab-NB. These specifications are typical at 25° C unless otherwisestated. The operating temperature range is 0° to 70° C. Analog Input Number of input channels...............

Specifications Appendix A Lab-NB User Manual A-2 © National Instruments Corporation normally called nonlinearity, because relative accuracy ensures that the sum of quantization uncertainty and A/Dconversion error does not exceed a given amount. Integral nonlinearity in an ADC is an often ill-defined...

Appendix A Specifications © National Instruments Corporation A-3 Lab-NB User Manual Voltage offset ......................................................................±60 µV/° C Explanation of Analog Output Specifications Relative accuracy in a D/A system is the same as nonlinearity, because no un...

Specifications Appendix A Lab-NB User Manual A-4 © National Instruments Corporation Physical Board dimensions........................................................................27.62 by 10.16 cm (10.875 by 4.0 in.)I/O connector .......................................................................

© National Instruments Corporation E-1 Lab-NB User Manual Appendix ECustomer Communication ___________________________________________________ For your convenience, this appendix contains forms to help you gather the information necessaryto help us solve technical problems you might have as well as ...

Technical Support Form ___________________________________________________ Photocopy this form and update it each time you make changes to your software or hardware, and use the completedcopy of this form as a reference for your current configuration. Completing this form accurately before contactin...

Documentation Comment Form ___________________________________________________ National Instruments encourages you to comment on the documentation supplied with our products. Thisinformation helps us provide quality products to meet your needs. Title: Lab-NB User Manual Edition Date: September 1995 ...

© National Instruments Corporation Glossary-1 Lab-NB User Manual Glossary ___________________________________________________ Prefix Meaning Value p- pico- 10 -12 n- nano- 10 -9 µ- micro- 10 -6 m- milli- 10 -3 k- kilo- 10 3 M- mega- 10 6 G- giga- 10 9 ° degrees Ω ohms % percent A amperes A/D analog-...

© National Instruments Corporation Index- 1 Lab-NB User Manual Index Numbers/Symbols +5 V signal (table), 2-782C55A Digital I/O Register group, 4-25 to 4-29 control words. See control words.Digital Control Register, 4-29digital I/O circuitry block diagram, 3-9OKI 82C55A data sheet, D-1 to D-17overvi...