Omega Products DAQ-802 Installation Manual

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DAQ-801/802

Data Acquisition System

For 16 bit ISA compatible machines

Users Manual

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OMEGA ENGINEERING, INC., warrants this unit to be free of defects in materials and workmanship fo r a period of 13

DAQ-800 Users Manual 2

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year product warranty

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DAQ-800 Users Manual 3

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DAQ-800 Users Manual 4

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Table of Contents

4 Theory of Operation

31

3.3.2 Differential Input

30

3.3.1 Single Ended Input

3 Field Wiring

2.5 After Completing Configuration

25

2.4.2 Changing Resources with Device Manager

24

2.4.1 Using the "Add New Hardware Wizard"

2.4 Installation under Windows95/98®

23

2.3.4 Timer0 Internal/External Clock Selection

21

2.3.3 Bipolar/Unipolar Output Range Selection

20

2.3.2 D/A Voltage Reference

18

2.3.1 I/O Base Address Selection

2.3 Configuring the DAQ-801/802

2.2 Auxiliary Connector Cable

2.1 Unpacking

2 Hardware Configuration and Initial Setup

1 Introduction

DAQ-800 Users Manual 5

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1.1 Analog Input Features

1.2 Analog Output Features

1.3 Digital I/O

1.4 Counter/Timer

1.5 Interrupts

1.6 Software Support

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1.7 Power Requirements

1.8 Applications

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1.9 DAQ-801/802 Specifications

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8
9

91.1.1 Gain Selection Ranges ..............................................

101.1.2 Source and Trigger Mode for Analog-to-Digital Conversions .............

101.1.3 Scan List ........................................................

111.1.4 Sampling Rate ....................................................

111.1.5 Data FIFO .......................................................

12
12
12
13
14
14
14
15

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3.1 I/O Terminal Connection

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3.2 D37 Connector Pin Diagrams

3.3 Analog Input Field Wiring

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3.4 Analog Output Field Wiring

3.5 Timer/Counter Field Wiring

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17
17
17
18

24

26

27
27
29
30

32
33

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34

6.5 Programming Examples

6.4 Accessing the Timer/Counter

47

6.3.2 Mode 1 ( Timing Applications)

47

6.3.1 Mode 0 (Event Counting)

6.3 Mode Definition

46

6.2.2 Read Operation

46

6.2.1 Write Operation

6.2 Functional Description

6.1 Introduction

6 8254 Timer/Counter

5.9 Analog Trigger Example

44

5.8.4 Base + 8000, Board Enable/Disable

44

5.8.3 Base + C..F, 82C55 Programmable Peripheral Interface chip

44

5.8.2 Base +A / B, DA1

44

5.8.1 Base + 8 / 9, DA0

5.8 Remaining Base Addresses

5.7 Base + 7, Scan Channel Register

5.6 Base + 6, 4-Bit Digital I/O

5.5 Base + 5 , Interrupt Status Register

5.4 Base + 4, Status Register

5.3 Base + 3, Index Registers

5.2 Base + 2, Index Register

5.1 Base + 0 / 1, Data FIFO

5 Address Map

4.5 Timer/Counter

4.4 Digital I/O

4.3 Analog Output

4.2 Analog Input

4.1 Signal Flow

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DAQ-800 Users Manual 6

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35
36
37
37

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38
39
39
40
42
43
43
43
44

44

45
45
45

47

47
49

List of Figures and Tables

46

Table 6-2. Control Word Modes of Operation

45

Table 6-1. Control Word Read/Write Actions

39

Table 5-2. Data FIFO Gain Values

38

Table 5-1. DAQ-800 Series Address Map

21

Table 2-2. DA1 Output Voltage Ranges

21

Table 2-1. DA0 Output Voltage Ranges

9

Table 1-2. Bipolar Analog Input Voltage Ranges

9

Table 1-1. Unipolar Analog Input Voltage Ranges

34

Figure 4-1. DAQ-801/802 Signal Flow Block Diagram

33

Figure 3-7. Timer/Counter Field Wiring

32

Figure 3-6. Analog Output Field Wiring

31

Figure 3-5. Differential Analog Input Field Wiring

30

Figure 3-4. Single-Ended Analog Input Field Wiring

29

Figure 3-3. D37 Pin Diagrams

28

Figure 3-2. Connection of UIO-37 Terminal Blocks to DAQ-800 Series Connectors

27

Figure 3-1. UIO-37 Screw Terminal Block

23

Figure 2-6. Internal/External Clock Selection Jumper

22

Figure 2-5. Bipolar/Unipolar Output Range Selection Jumper

20

Figure 2-4. D/A Voltage Reference Jumper

19

Figure 2-3. I/O Base Address Selection

18

Figure 2-2. I/O Base Address Selection Switches

17

Figure 2-1. Auxiliary Connector Cable

8

Figure 1-1. Component Layout Diagram

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DAQ-800 Users Manual 7

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1 Introduction

The DAQ-801 and DAQ-802 are cost effective high speed data acquisition boards that plug

DAQ-800 Users Manual 8

into ISA expansi on slots in IBMTM compatible personal computers. The DAQ-800 series circuit
board provides 12-bit analog input, 32-bit digital input/output (I/O) and three 16-bit
programmable timer/counters. Each version of the DAQ-800 series board has it's own
selectable gain range. The DAQ-801 is software programmable for gains of 1, 10, 100 or 1000.
The DAQ-802 is software programmable for gains of 1, 2, 4 or 8.

The maximum sampling r ate of the DAQ- 801/802 is 40KHz. The anal og and d igital I/Os and
the external trigger, clock and reference si gnals are connected via a 37-pi n "D" type connector
which is compatible with the Keithley MetraByteTM DAS-1600. An auxiliary D37 connector is
employed to support an additional 24-bits of digital I/O. The component layout diagram for
the DAQ-800 series circuit board is depicted in Figure 1-1.

DAQ-800

20MHz

1234

ADC1241

FIFO

FIFO

sw2

56

D/A

D/A

PGA

J2

5

1

8

4

MUX

J3

3

1

8254

8255

J4

Axiliary I/O

1
3

FPGA3042

sw1

1234

Base I/O Address

56

Figure 1-1. Component Layout Diagram

1.1 Analog Input Features

DAQ-800 Users Manual 9

The DAQ-801/802 uses one 12 bit analog-to-digital converter (ADC) to support 8 differential
(positive and negative connections) or 8 single ended analog input signals. Selection of either
single ended or differential analog inputs is software programmable. The DAQ-800 series
ADC can be configured to receive analog input voltages within the ranges of 0 to +5V or ±5V.

1.1.1 Gain Selection Ranges

The DAQ-801 provides gains of 1, 10, 100 and 1000 versus the DAQ-802, w hich provides gains
of 1, 2, 4 and 8. Tabl es 1-1 and 1- 2 show the analog input unipolar and bi polar voltage ranges
for the respective gain range.

DAQ-802 DAQ-801

GainInput RangeGainInput Range

10 to +5V10 to +5V
20 to +2.5V100 to +500mV
40 to + 1.25V1000 to +50mV
80 to +0.625V1,0000 to +5mV

Table 1-1. Unipolar Analog Input Voltage Ranges

For a gain setting of 1, the 12-bi t resolution (4096 count) provides a least signif icant bit (LSB)
value of ±1.22 mV in the 0 to +5V range.

DAQ-802 DAQ-801

GainInput RangeGainInput Range

1-5 V to +5 V1-5V to +5V
2-2.5 V to +2.5V10-500mV to +500mV
4-1.25 V to +1.25V100-50mV to +50mV
8-0.625V to +0.625V1,000-5mV to +5mV

Table 1-2. Bipolar Analog Input Voltage Ranges

For a gain setting of 1, the 12-bit resolution (±4096 count) provides a least signif icant bi t (LSB)
value of ±1.22mV in the ±5V range.

1.1.2 Source and Trigger Mode for Analog-to-Digital Conversions

Upon initial power up, the DAQ-801/802 is in idle mode and no conversions are performed.

DAQ-800 Users Manual 10

Conversions begin upon receiving a trigger. Two types of triggers are available: internal
trigger and external trigger. The internal trigger is initiated by a software program, whereas
the external trigger is connected through hardware. The external trigger type can be either
TTL or analog. The TTL trigger input comes from pi n 25 on the main connector. The analog
trigger channel is the start channel in the scan list and it's trigger voltage is set by D/A
channel 1. When a trigger is initiated, the ADC immediately converts the analog signal into
12-bit digital data which is stored in the data FIFO (First In First Out) register. In addition to
varied triggering sources, a triggering mode is available to select whether conversions and
channel scans are completed only once or multiple times. Trigger source and trigger mode
types are software selectable.

Triggering functions are summarized as follows:

(a) Trigger sources (internal/external) :



Internal software trigger



External TTL trigger on falling or rising edge



External analog trigger with low to high or high to low transition

For the external TTL trigger, the default trigger pin on the main D37 connector is pin 25.

(b) Trigger mode:



Single -- one scan/conversion for each trigger



Continuous -- continuous scanning/conversions for one trigger

1.1.3 Scan List

The DAQ-801/802 scan list function performs high speed A/D conversions from channel to
channel enabling the user to digitize and collect data from several analog input channels
almost simultaneousl y. The scan FIF O must be programmed w ith the start and stop channel s
and also according to the scan sequence desired. When the scan list function is initiated, A/D
conversion begins from the start channel. After the conversion is completed, digitized data is
entered into the data FIFO an d the b oard sel ects the next locati on to repe at the same task. T his
process continues until the stop channel is reached. Before the scan list function is called, the
FPGA registers must be written with the start and stop channels and their corresponding
gains. If the user specifies the start and stop channels to be the same, then single channel
acquisition mode occurs. Otherwise, the scan is sequential and incremental by one. For single
trigger mod e, i t scans once and then stops. In continuous mode, scanning continues at a speed
set by the sampling rate until the desired number of scan times is reached.

1.1.4 Sampling Rate

DAQ-800 Users Manual 11

When digitizing the analog signal, one user selectable parameter is the sampling rate which
determines how fast the analog signal is digitized. The minimum sampling rate must be at
least two times the input signal frequency to accurately recover digitized data from the
original analog input signal. The maximum sampling rate of the DAQ-801/802 is 65KHz
without auto zero ca l i bration and 3 9KHz with auto ze r o calibrati on an d i s d e r i ve d f r om the on
board 8254 chip which has three 16-bi t timer/counters. The clock input to timer1 is 2.5MHz.
Timer1 and timer2 are cascaded to generate the sampling rate pulse which in turn triggers
A/D conversion.

1.1.5 Data FIFO

DAQ-801/802 uses a data FIFO register between the output of the ADC and the ISA bus to
buffer data from the ADC output. Unlike conventional A/D boards where the di gitized data
output is fetched directly to the PC memory, the output data from the ADC is fed into the
FIFO first for temporary storage. The length of the FIFO register is 1024 sampling points and
the register circuit provides hardware flags for half full, full and empty signals. Utilizing these
signals, the b oard ca n genera te an inter rupt to the PC when the FIFO i s ha lf f ull . Once the PC
interrupt is complete, the interrupt service routine program uses the "MOVE STRING"
instruction to move the FIFO da ta directly in to PC memory at a very high speed. In this case,
it only interrupts the PC every 512 samples and thereby improves the speed of operation. In
Windows appl ications, the latency of the inte rrupt d oes not effect the i ntegr ity of the di gi tized
data as it continues into the FIFO. The status register (see Chapter 5, Table 5-1: Address map)
provides information about FIFO empty, half full and full conditions.

1.2 Analog Output Features

In addition to the analog input channels, the DAQ-801/802 contains two analog output

DAQ-800 Users Manual 12

channels. Each channel has its own 12-bit di gital-to-analog converter (DA0 and DA1 at pins 9
and 27 on the main I /O D37 connector ). T he analog outputs a re buf fer ed and capab le of 1 mA
of output current. The output voltage range for each channel is jumper selectable as unipolar
or bipolar. The 12-bit resolution provides a LSB value of 4.88mV on the ±10V range and

2.44mV in the 0 to +10V range. Both channels use multipl yi ng D ACs which requi r e a ref erence
voltage input in addition to the 12-bit digital values. The DAQ801/802 provides an internal
reference voltage while an external reference voltage can also be supplied via jumper
configuration.

1.3 Digital I/O

The DAQ-801/802 has 32 digi tal I/O lines. Of the 32 li nes, 8 of them can be accessed through
the main D3 7 conne ctor . There are 4 inputs: I P0 throug h I P3, and 4 outputs: OP0 through OP3,
(refer to Chap ter 3, Figure 3 -3 for pin l ocations). The remain ing 24 I/O lines ar e generated by
an 8255 programmable peripheral interface chip and are accessed through the auxiliary D37
connector. The 8255 has three ports (A, B and C) and one control register. Any port can be
programmed as in put or output. Ports A and B ar e 8 bit I /O por ts whil e port C can be f urther
divided into two 4-bi t I/O ports. T he 8255 has three modes of operation whi ch are d etermi ned
by values wr itten into the control regi ster. Mode 0 i s for basic input/output config uration in
which the output port is l atched and the input por t is not. Mode 1 employs Port A or B a s the
data port while using Port C for handshake, interrupt, and digital I/O lines. Mode 2 uses Port
A as the bi-directional data port with Port B and C as control and digital I/O lines. For a
detailed functional description, the user is referred to the Intel® 8255 data manual.

1.4 Counter / Timer

The 8254 timer/counter chip on the DAQ-801/802 provides three 16-bit timer/counter
channels for time-related applications. Timer1 and timer2 are cascaded together with an input
clock of 2.5MHz and the output of timer2 is used as the sampling rate clock for the A/D
converter. T hr e e terminal s for timer 0 ar e availab l e to the user vi a the main I/O D 37 connector .
The three terminals are Pin 2 (Timer0 Out), Pin 21 (Timer0 Clk) and Pin 24 (Timer0 Gate). The
gate termina l should b e log ic high i n order for the counter to function. If gate is hel d at logi c
low, the counter is disabled.

1.5 Interrupts

DAQ-800 Users Manual 13

The DAQ-801/802 supports AT style ISA bus interrupts which includes IRQ 2-7, 10-12 and
14-15. The selection of inter rupts is softwa re programmabl e through the reg ister setting of the
FPGA. Any interrupt conflict can be conveniently resolved by moving the selection to another
available line without opening the computer case. There are four interrupt sources from
DAQ-801/802:



End of scan



Data FIFO Half Full



Data FIFO Full



Timer0

The end of scan interrupt is normally used in conjunction with single trigger mode or in
continuous mode when the scan rate is less than 1KHz. After the scan list is completed, the
end of scan generates an interrupt to inform the computer to fetch the data.

The data FIFO half full interrupt is used during continuous trigger mode. When the FIFO is
half full, i t interrupts the PC to fetch at least 512 sample points. This interrupt works well in
the Windows environment because of interrupt latency problems inherent in the Windows
operating system.

The data FIFO full interrupt is not recommended for applications unless the interrupt routine
is executed promptly before the next data points are accepted. Otherwise an overflow can
occur and data may be lost.

Timer0 in terrupt is used in conjunction with the external ti mer at the main D37 connector. The
external cl ock pulses are connected to the time r0 clk input (pin 21) and the output of timer0
can be used as an interrupt source. When the user must interrupt the PC at a certain time
interval, timer0 can be programmed to meet the requirement.

1.6 Software Support

Software drivers are provided to support various programming languages like Microsoft

DAQ-800 Users Manual 14

C/C++, Borla nd C/C++, Qui ckB asic, Vi sual Basi c f or MS-D OS a nd T urbo Pascal . A D ynami c
Link Library (DLL) is provided for numerous programming languages under Windows as
well as Visual Basic Controls. Software support is available on the Omega "DaqSuite" compact
disk in the following categories:

1. DAQDRIVE® Software driver

2. DaqEZ™ Data Acquisition Package

3. VISUALDAQ® Data Acquisition Package

DAQDRIVE is a low level generic driver consisting of a set of user commands that act as a
library routine for all d ata acquisition boards. Programs written for the DAQ-801/802 can be
ported to other boards in the event the user decides to change boards in the future.
DAQDRIVE is available for Window DLLs and the MS-DOS environment. In the case of
Visual Basic applications, Omega provides VISUALDAQ®. Because of it's user friendly
nature, this software is very practical for interaction with data acquisition boards and for
creating graphic presentations.

Omega also provides driver support for third party data acquisition packages such as
TestPoint® (Capital Equipment Corporation) and LabVIEW® (National Instruments). These
packages allow the user to create custom test, measurement and data acquisition applications.

1.7 Power Requirements

The DAQ-801/802 is powered directly by the +5V and +12V power source provided by the
computer bus.

1.8 Applications

The DAQ-801/802 performs the following functions: analog input (A/D), analog output
(D/A), digital I/O and timer/counter functions. Typical applications for each function are
listed as follows:

A/D conversion converts analog voltage into digital information, which enables the computer
to process or to store the signals. Typical appl ications are sensor or transd ucer measurement,
wave form acquisition/analysis and data storage. (Most sensor/transducer measurements
require signal conditioning prior to measurement by an A/D converter).

D/A conversion is the opposite of A/D conversion. This operation converts digital
information to analog voltage. Typical applications are process control and function/pulse
train genera tion. The dig ital input f unction is useful in appl ications such as contact closure or
switch status monitoring. The digital output function is useful for relay control and industrial
on/off control. A timer/counter is typi cally used for eve nt counting and pulse g eneration. It
can also be used for frequency, period or pulse measurement.

1.9 DAQ-801/802 Specifications

Adjustable to 0

Gain Error

Adjustable to 0

Zero Error

8 Samples

Size of Scan List

without auto zeroing: 15.2µs

with auto zeroing: 25.6µs

Scan Time (channel to channel)

Twos complement

Output Data Code

-5V to +5V

Input Ranges

8 differential, 8 single ended

Channels

39 Khz (with auto-zero calibration)

65 Khz (without auto-zero calibration)

Maximum Sampling Rate

Analog Input

Analog Output

4

Input Bits

82C54

Type

3, down

Number of Counters

Timer/Counter

24 bits

I/O

(24 bits on Auxiliary Connector)

Digital I/O

DAQ-800 Users Manual 15

Gain Ranges:
Model 801
Model 802

1, 10, 100, 1000
1, 2, 4, 8

1 M ohmInput Impedance
50pAInput Bias Current

Surge Protection up to

±20 V

12-bit + signResolution
Successive ApproximationConversion type

2Channels
0 - 5V, 0 - 10V, ±5V, ±10VOutput Ranges
Straight BinaryOutput Data Coding
12-bitResolution

(8 bits on main D37 Connector)Digital I/O

4Output Bits

82C55AType

60 mA typ, 80 mA max

-12vdc

120 mA typ, 160 mA max

+12vdc

15 mA typ, 20 mA max

-5vdc

750 mA typ, 900 mA max

+5vdc

Power Requirements

0 - 70° COperating Temperature

Environments

DAQ-800 Users Manual 16

3-7, 9-12, 14, 15Interrupt Level
0-95%Humidity
7 in x 4.8 inDimensions