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DAQ-16
Data Acquisition Adapter
for 16-bit ISA compatible machines
Users Manual
INTERFACE CARDS FOR PERSONAL COMPUTERS
OMEGA ENGINEERING, INC. TEL: (203) 359-1660
One Omega Drive FAX: (203) 359-7700
P.O. Box 4047 Toll free: 1-800-826-6342
Stamford, CT 06907-4047 E-mail: das@omega.com
http://www.dasieee.com
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WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC., warrants this unit to be free of defects in materials and workmanship for a period of 13 months from the date of purchase. OMEGA warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover shipping and handling time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA’s Customer Service D
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OMEGAnet® On-line Service: Internet e-mail: http://www.omega.com info@omega.com Servicing North America: USA: One Omega Drive, Box 4047 E-mail: info@omega.com ISO 9001 Certified Stamford, CT 06907-0047 Tel: (203) 359-1660 FAX: (203) 359-7700 Canada: 976 Bergar E-mail: info@omega.com Laval (Quebec) H7L 5A1 Tel: (514) 856-6928 FAX: (514) 856-6886 For immediate technical or application assistance: SM USA and Canada: Sales Service: 1-800-826-63
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United Kingdom: One Omega Drive, River Bend Technology Drive ISO 9002 Certified Northbank, Irlam, Manchester M44 5EX, England Tel: 44 (161) 777-6611 FAX: 44 (161) 777-6622 Toll Free in England: 0800-488-488 E-mail: info@omega.co.uk It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of it’s products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon cert
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Declaration of Conformity Manufacturer's Name: Omega Engineering Inc. Manufacturer's Address: One Omega Drive Stamford, CT 06907-0047 Application of Council Directive: 89/336/EEC Standards to which Conformity is Declared: * EN50081-2 (EN55022, EN60555-2, EN60555-3) * EN50082-1 (IEC 801-2, IEC 801-3, & IEC 801-4) Type of Equipment: Information Technology Equipment Equipment Class: Light Industrial Equipment Product Name: ISA Data Acquisition Card Model Number : DAQ-16 DAQ-16 Users Ma
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Table of Contents 1. Introduction ......................................................... 8 1.1 Installation ........................................................ 8 1.2 DAQ-16 Specifications ............................................. 9 2. Circuit Board Description and Configuration .............. 10 2.1 Analog to Digital Converter ...................................... 10 2.2 Digital to Analog Converters ..................................... 14 2.3 Digital Input/Output ...........
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List of Figures and Tables Figure 2-1. Jumper J7 Configuration ............................................ 11 Figure 2-2. Jumper J6 Configuration ............................................ 11 Figure 2-3. Jumper J5 Configuration ............................................ 12 Figure 2-4. Jumper J3 Configuration ............................................ 14 Figure 2-5. I/O Base Address Selection .......................................... 16 Figure 2-6. Jumper J2 Configuratio
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1. Introduction The DAQ-16 is a high speed data acquisition adapter for IBM AT compatible machines offering eight differential analog input channels with 16-bit resolution, two analog output channels with 12-bit resolution and four digital input/output lines. Other features of the DAQ-16 include: Analog to Digital Converter 100 KHz maximum sampling rate Bipolar input ranges of ±2.5, ±5, and ±10 volts Unipolar input ranges of 0 to +2.5, 0 to +5 and 0 to +10 volts Selectable gain of 1, 10
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1.2 DAQ-16 Specifications Bus Interface: ISA 16-bit I/O Address Range: 0000H - FFFFH Interrupt Levels: IRQ 2, 3, 4. 5, 6, 7, 10, 11, 12, 14, 15 DMA Levels: DRQ 5, 6, 7 DACK 5, 6, 7 Power Requirements: Power Supply I(t) I(ms) -5 volts --- --- +5 volts 1069.0 mA 1204.9mA -12 volts --- --- +12 volts 374.9 mA 491.4mA I(t) = Typical Current / I(ms) = Maximum Statisical Current DAQ-16 Users Manual
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2. Circuit Board Description and Configuration The base address of the DAQ-16 is selected using switches SW1 and SW2. The operating mode of the DAQ-16 is controlled by jumpers J1 through J7, while DMA and interrupt selections are set with jumpers J8 through J11. Connections to external equipment are made through the high density 62-pin connector CN1. 2.1 Analog to Digital Converter The analog to digital (A/D) section of the DAQ-16 accepts up to 8 differential inputs from the D-62 connector.
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Figures 2-1 and 2-2 show the configuration options for jumpers J7 and J6. J7 J7 J7 3 4 4 3 4 3 1 1 2 2 1 2 Gain = 1 Gain = 10 Gain = 100 Figure 2-1. Jumper J7 Configuration J6 J6 J6 4 5 6 4 5 6 4 5 6 1 2 3 1 2 3 1 2 3 5 volt range 2.5 volt range 10 volt range Figure 2-2. Jumper J6 Configuration WARNING: These settings are only suggestions, it is the user's responsibility to guarantee that the maximu
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The final stage of the A/D converter circuit is the A/D converter IC. The converter must be configured for unipolar or bipolar input voltages and for binary or 2's complement data conversion. These options are selected using jumper J5 as shown in Figure 2-3 below. J5 J5 4 5 6 4 5 6 1 2 3 1 2 3 Bipolar Unipolar J5 J5 4 5 6 4 5 6 1 2 3 1 2 3 2's complement Binary Figure 2-3. Jumper J5 Configuration To si
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Voltage Binary Binary 2’s Complement 2’s Complement unipolar bipolar unipolar bipolar -Vmax n/a 0 n/a -32,768 -Vmax/2 n/a +16,384 n/a -16,384 0 0 +32,768 -32,768 0 +Vmax/2 +32,768 +49,152 0 +16,384 +Vmax +65,535 +65,535 +32,767 +32,767 Table 2-2. A/D Conversion Format Examples In order to calculate the actual input voltage from the digital "code" provided by the DAQ-16, the user must know the configuration used to acquire the data. Given this information, the input voltage can be calculated usin
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2.2 Digital to Analog Converters The digital to analog (D/A) section of the DAQ-16 consists of two independent 12-bit multiplying D/A converters, and two independent two-stage output amplifiers. Digital data, (output to the D/A converter by the CPU), is converted to an analog voltage by the D/A converter, amplified by the output amplifiers and becomes output to the 62 pin connector at CN1. The D/A converters used on the DAQ-16 are 12-bit resolution converters. Of the 16 bits written to the D/A
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5 6 7 8 J4 1 2 3 4 Channel 0 select Channel 1 gain Channel 1 select Channel 0 gain Figure 2-5. Jumper J4 Configuration Table 2-3 lists configuration options for jumper J4. Channel 0 Channel 1 Bipolar connect 1-5 connect 3-7 Unipolar open 1-5 open 3-7 Gain = 1 connect 2-6 connect 4-8 Gain = 2 open 2-6 open 4-8 Table 2-3. Jumper J4 Configuration When configured for unipolar operation, the output voltage can be calculated from the equation: CODE A = V * * gain out ref 4096 For
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2.4 Base Address The DAQ-16 uses 16 consecutive I/O address locations in the range 0 to 0FFFFH. Two six-position switches (SW1 and SW2) are used to select the base address. SW1 controls address lines A15 - A10, and SW2 controls A9 - A4. Address lines A3 - A0 are used internally by the DAQ-16 to select which register to access. When selecting a base address for the DAQ-16, an address selection switch in the "OFF" position corresponds to an address bit of "1" while a switc
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2.5 Clock Selection The DAQ-16 is equipped with a programmable clock circuit to produce data sampling rates independent from the clock rate of the host computer. An onboard 8254 programmable interval timer, with a 10 MHz clock input and either two or three cascaded 16-bit timers, provides the sampling rate. This enables the sampling rate to be adjusted from 10 us between samples to almost a year between samples, in as small as 100ns increments. The DAQ-16's sampling rate can also be generated
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2.5.1 Internal Clock Sampling rates for the internal clock can be calculated using the following equation: t = 100ns * [N1*N2] or f = 10MHz / [N1*N2] where N1 is the low 16-bits of the clock divider and N2 is the high 16-bits of the clock divider. The following criteria must be met when selecting values for N1 and N2: N1 < 65,535 2 < 2 < N2 < 65,535 N1 * N2 > 100 Using the equations above, the minimum and maximum data sampling rates for the inter
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When configured for a 48-bit divider, the first sampling period will be slightly longer than the others because the first clock period is required to load the initial value of the multi-function timer. The following equation calculates the additional time of the first period: t = 100ns * [N1 * N2] add To minimize the amount of additional time required for the first sample, select clock dividers such that N1 and N2 are as small as possible and N3 is as large as possible. Using the
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When the multi-function timer is used as a pre-divider, the frequency of the external clock input may be varied from DC to 10 MHz as long as the high portion of the clock is at least 30ns and the low portion is at least 50ns. Except for the first period, the sampling rate of the DAQ-16 will be the external clock frequency divided by the count value written to the multi-function timer. Since one clock pulse is required to load the initial count value into the timer, the first sampling interval
