Instruction/ maintenance manual of the product DAQ-16 Omega Vehicle Security
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INTERFACE CARDS FOR PERSONAL COMPUTERS DAQ-16 Data Acquisition Adapter for 16-bit ISA compatible machines Users Manual 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.
WARRANTY/DISCLAIMER OMEGA ENGI NEERING, INC. , w arrants this unit to be free of def ects in materials and w orkmanship for a perio d of 13 mont hs from the date of purchase. OMEGA w arranty adds an ad ditional one (1) month grace period to the normal one (1 ) year pr oduct w arr anty to co ver shipping and handling time.
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.
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 OM EGA to comply with al l worl dwide safety and EM C/EMI regulations that apply.
Declaration of Conf orm ity Manufacturer's Name: Omega Engineering Inc. Manufacturer's Address: One Omega Drive Stamford, CT 06907-0047 Application of Council Directive: 89/336/EEC Standards.
Table of Contents 28 4.2 Programming the 8254 Counter/Timer ............................ 27 4.1.8 8254 Control Word/Status Register ................................... 27 4.1.7 Multi-Function Timer Register ....................................... 27 4.
List of Figures and Tables 25 Table 4-1. DAQ-16 Address Map .............................................. 15 Table 2-3. Jumper J4 Configuration ............................................ 13 Table 2-2. A/D Conversion Format Examples ................
1. Introduction The DA Q-1 6 is a high s peed dat a ac quisit ion adap te r for IBM AT com pat ible mac hine s off eri ng ei ght d if fer ential anal og i nput channel s with 16- bit r esol ution, two anal og output channel s with 12-b it r esoluti on and four di gi tal i nput/output lines.
1.2 DAQ-16 Specifications DACK 5, 6 , 7 DRQ 5, 6 , 7 DMA Levels: IRQ 2, 3, 4. 5, 6, 7, 10, 11, 12, 14, 15 Interrupt Levels: 0000H - FFFFH I/O Address Range: ISA 16-bit Bus Interface: 491.
2. Circuit Board Description and Configuration The ba se addres s of t he DA Q-1 6 is sele ct ed using s witch es SW1 and SW 2. The op erat ing mo de of t he DAQ-16 is co nt rolled by jump ers J1 th rough J7 , while DMA an d interru pt sele ctions ar e set wi th jumper s J 8 throug h J 11.
Figures 2-1 and 2-2 show the configuration options for jumpers J7 and J6. J7 J7 J7 1 3 2 4 2 4 2 4 1 3 1 3 Ga i n = 1 Gai n = 1 0 Gai n = 1 00 Figure 2-1. Jumper J7 Configuration 10 vo l t ra ng e 1 2 3 4 5 6 J6 5 vo l t ra ng e 1 2 3 4 5 6 J6 2.5 vol t r ange 4 5 6 1 2 3 J6 Figure 2-2.
The final stage of the A/D converter circuit is the A/D converter IC . The co nverter must be co nfigur ed for u nipo lar o r bipolar inp ut vo ltages a nd for binary o r 2' s com plemen t dat a conversion. These options are selected using jumper J5 as shown in Figure 2-3 below.
+32,767 +32,767 +65,535 +65,535 +Vmax +16,384 0 +49,152 +32,768 +Vmax/2 0 -32,768 +32,768 0 0 -16,384 n/a +16,384 n/a -Vmax/2 -32,768 n/a 0 n/a -Vmax bipolar unipolar bipolar unipolar 2’s Complement 2’s Complement Binary Binary Voltage Table 2-2.
2.2 Digital to Analog Converters The di gi tal to an alog (D /A) se ction of the DA Q-16 consi sts of two i ndepe nden t 12-b it multi ply ing D /A converte rs, and tw o ind ependent two-stag e output ampl ifi ers.
5 6 7 8 1 2 3 4 J4 Channel 1 gain Channel 1 select Channel 0 select Channel 0 gain Figure 2-5. Jumper J4 Configuration Table 2-3 lists configuration options for jumper J4. connect 4-8 open 4-8 connect 2-6 open 2-6 Gain = 1 Gain = 2 connect 3-7 open 3-7 connect 1-5 open 1-5 Bipolar Unipolar Channel 1 Channel 0 Table 2-3.
2.4 Base Address The DAQ-16 uses 16 consec utiv e I/O address lo cation s in the range 0 t o 0FFFFH. Two six- positi on switches (SW1 and SW2) are used to select the base add ress. SW1 controls addres s lines A15 - A 10, and S W2 co nt rols A9 - A4. Addres s lines A3 - A0 are us ed internally by the DAQ-16 to select which register to access.
2.5 Clock Selection The D AQ-1 6 is e quipped wi th a progr ammab le cl ock ci rcui t to pr oduce d ata sampl in g rate s independ ent from the clock rate o f the host co mputer. An onboard 8254 programmabl e inte rval time r, wi th a 10 MHz clock input and ei ther tw o or thr ee cascad ed 16-b i t timer s, provi d es the sampl i n g r a te.
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] wher e N1 is the low 1 6-b its of the clock di vid er and N2 is the high 1 6-b its of the clock divider.
Whe n co nfigured fo r a 48-bit div ider, the first s ampling p eriod will be slightly lo nger th an the other s because the fi rst cl ock per iod is r equi red to l oad the i ni tial val ue of the multi-function timer.
When the mul ti- functi on time r is use d as a pr e-d i vid er, the fr equency of the ex ternal cl ock input may be var ied fr om DC to 10 MHz as l ong as the hi gh porti on of the cl ock is at l east 30ns and the low porti on is at least 5 0ns.
2.7 Direct Memory Access Di rect Me mory Acce ss (D MA) tra nsfe rs provi de a way of transf er ri ng da ta fr om the DAQ- 16's A/D converter in to the computer's memor y w ithout usi ng the Ce ntral Processi ng Unit (CPU). DMA capa bility e nable s o ther syst em so ftware to be e xecut ed while data is being input from the DAQ-16.
2.8 Interrupts The DAQ-16 is capable of generating an interrupt from one of four sources: 1. End of conversion signal 2. DMA terminal count 3. Multi-function timer output 4. External interrupt input The i nterrupt source is softwar e selected through the D AQ-16 contr ol word r egi ster.
3. External Connections The DAQ-16 is equipped with a high density 62-pin connector as shown in Figure 3-1. 2 - CH1+ 4 - CH2 - 6 - CH 4+ 8 - CH5- 10 - CH7+ 12 - AOUT0 14 - DOUT0 6 - DOUT3 18 - EXT TRI.
CH0 -,CH0+ ,...,CH7-,C H7+ : Ana log inpu ts t o t he an alog to digit al c onv ert er. Am plitude and polar ity d epend upon jumper setting s. The i nput re sistance of these l ines i s 1.5K ohms typical. AOUT 0, A OUT1 : Ana log outputs from the d i gi tal to ana log conve rter s.
4. Register Description and Programming The DAQ-16 us es 16 consecu tive I/ O address lo cations in the range 0 to FFFFH. The card ut ilizes thes e addre ss es fo r the regist ers list ed in Table 4-1 . (* indicat es regis ters loca te d in 8254 counter).
DMAEN - enables / disables DMA. When set, logic 1, DMA transfers are enabled. DMAC T - e nable s t he m ulti-c hanne l DM A capa bility o f th e DAQ -16. When s et, logic 1 , a termi nal count on the acti ve DMA channe l cause s DMA tr ansfer s to beg in on the "stand -b y" ch ann el.
4.1.2 Start of Conversion Register The start of conversion register is 16-bit write only and performs two functions: 1. Wh en co nfigured for inte rnal triggerin g, writing a "0" to th is regist er generat es the software trigger, starting the data conversion process.
4.2 Programming the 8254 Counter/Timer This section provides programming information for the 8254 co unter/timer as i mplemented on the DAQ-16. For more details on the 8254, consult the Intel Micro-Processor and Peripheral Handbook. To program any of the counters contained in the 8254 counter/timer, three steps are required: 1.
Counter 1 - Clock rate register (high word) operating mode: 2 minimum count value: 2 configuration byte: 0 / 1 / 1 / 1 / 0 / 1 / 0 / 0 = 74H Example: Program the value 13A4H into the high word of the clock rate register.
DAQ-16 Users Manual Version 2.20 January 28, 1999 Part No. 940-0032-220.
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If you already are a holder of Omega Vehicle Security DAQ-16, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Omega Vehicle Security DAQ-16.
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