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2192-09062-000-000 j266 pcad 12/16h pcad12/16h 16-channel 12-bit adc board technical manual product information full information about other arcom products is available via the f f a a x x - - o o n n - - d d e e m m a a n n d d s s y y s s t t e e m m , (telephone numbers are listed below), or by contacting our w w e e b b s s i i t t e e in the uk at: w w w w w w . . a a r r c c o o m m . . c c o o . . u u k k or in the us at: w w w w w w . . a a r r c c o o m m c c o o n n t t r r o o l l s s . . c c o o m m u u s s e e f f u u l l c c o o n n t t a a c c t t i i n n f f o o r r m m a a t t i i o o n n c c u u s s t t o o m m e e r r s s u u p p p p o o r r t t s s a a l l e e s s tel: +44 (0)1223 412 428 tel: +44 (0)1223 411 200 fax: +44 (0)1223 403 400 fax: +44 (0)1223 410 457 e-mail: support@arcom.co.uk e-mail sales@arcom.co.uk or for the us e-mail icpsales@arcomcontrols.com u u n n i i t t e e d d k k i i n n g g d d o o m m arcom control systems ltd clifton road cambridge cb1 4wh, uk tel: 01223 411 200 fax: 01223 410 457 fod: 01223 240 600 u u n n i i t t e e d d s s t t a a t t e e s s arcom control systems inc 13510 south oak street kansas city mo 64145 usa tel: 816 941 7025 fax: 816 941 0343 fod: 800 747 1097 f f r r a a n n c c e e arcom control systems centre d?affaires scaldy 23 rue colbert 7885 saint quentin cedex, france tel: 800 90 84 06 fax: 800 90 84 12 fod: 800 90 23 80 g g e e r r m m a a n n y y kostenlose infoline: tel: 0130 824 511 fax: 0130 824 512 fod: 0130 860 449 i i t t a a l l y y numeroverde: fod: 1678 73600 b b e e l l g g i i u u m m groen nummer: tel: 0800 7 3192 fax: 0800 7 3191 n n e e t t h h e e r r l l a a n n d d s s gratis 06 nummer: tel: 06022 11 36 fax: 06022 11 48 the choice of boards or systems is the responsibility of the buyer, and the use to which they are put cannot be the liability of arcom control systems ltd. however, arcom?s sales team is always available to assist you in making your decision. ? 1996 arcom control systems ltd arcom control systems is a subsidiary of fairey group plc. specifications are subject to change without notice and do not form part of any contract. all trademarks recognised. arcom control systems ltd operate a company-wide quality management system which has been certified by the british standards institution (bsi) as compliant with iso9001:1994
manual pcb comments issue b issue c v1 iss 4 v1 iss 4 960724 9801 15 eco2684. preface packing list this product is shipped as follows: ? board ? user manual ? utility disk ? pcbus library datasheet if any of the above appear to be missing, please telephone arcom 01223 41 1200. utility disk this product is shipped with a utility disk which contains: ? demonstration programs supplied as dos c libraries, which are compatible with borland c 4.0 and microsoft v isual basic 1.5 ? pcbus library manual ? source code for all pcbus i/o boards ? t est programs for calibration handling this board contains cmos devices which could be damaged in the event of static electricity being discharged through them. at all times please observe anti-static precautions when handling the board and always unpack and install the board in an anti-static working area. please ensure that should a board need to be returned to arcom, it is adequately packed and if a battery is fitted, that it is isolated. page 2 2192-09062-000-000 j266 pcad 12/16h revision history
page 3 2192-09062-000-000 j266 pcad 12/16h preface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 packing list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 utility disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 handling (esd/packaging) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 reading or w riting to the board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 adc sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 programmable t imer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 i/o map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 i/o function register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 adc data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 links and switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 default link position diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 base address switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 board functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 user configuration record diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 connectors: d-50 output connector (pl2) pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 installation for ce compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 circuit diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 contents
page 4 2192-09062-000-000 j266 pcad 12/16h
page 5 2192-09062-000-000 j266 pcad 12/16h introduction the pcad12/16h is an 8-bit isa bus add-on board with a 12-bit high-speed analogue to digital converter (adc) and 16 dif ferential, multiplexed inputs. four alternative input voltage ranges may be selected through software, while uni-polar or bi-polar operation may be selected by jumpers. the board includes a programmable timer , which may be used to trigger the adc periodically , or the adc may be triggered directly through software or external signal. the d-50 i/o connector conforms to arcom s standard signal conditioning system (scs) and may be used to drive a range of signal conditioning boards (scb); see arcom s pcbus catalogue for more details. features ? ce compliant design ? 12-bit high-speed adc : 20 m s conversion time ? four input ranges: 0.5v , 1v , 5v , 10v ? uni-polar or bi-polar inputs ? 16 dif ferential input channels : 50 m s channel switching time ? counter-t imer programmable for adc conversion rate ? external trigger pulse, ttl low ? on-board analogue power supply ? compact i/o addressing scheme (link-selectable base address) ? board access led ? user-controlled indicator led ? 8-bit isa bus interface ? i/o connector conforms to arcom signal conditioning system (scs) ? operating temperature range, +5 c to +55 c ? power required: +5v @ 200ma typical, +12v @ 200ma max ? mtbf: 275,000 hours (using generic figures from mil-hdbk-217f at ground benign) getting started ? switch of f pc ? install board in supplied configuration ? switch on pc ? run examp-01 (supplied on utility disk) ? an access/user led should flash. if not check default link configuration
page 6 2192-09062-000-000 j266 pcad 12/16h operation reading or w riting to the board control of the pcad12/16h is achieved by writing to a pointer register and then accessing a data register to read or write the required function. the pointer register need only be written with a new value if a dif ferent data register is next to be accessed. adc data is read from a pair of dedicated registers, so the pointer register does not need to be written first. the board occupies only four bytes of pcbus i/o space. each time the board is accessed, the red led will flash momentarily . adc sequence the adc may be triggered from three alternative sources, selected by a jumper: ? software trigger , from reading a data register ? hardware trigger , from an external ttl input, approx. 1-2 m sec low pulse ? periodic timer , programmed from the on-board ctc in the second two cases an interrupt should be used to signal that a new value is ready . w ith a software trigger all timing can be done from the program using this sequence: ? select channel register and write channel value ? select gain register and write gain value (only needed when gain changes) ? delay for input settling (about 50 m sec) ? select software trigger register and read (value not defined) ? delay for adc conversion (about 20 m sec) ? select status register and read to check that new value is ready ? read adc data registers programmable t imer the ctc device has three 16-bit down counters which are connected in a daisy chain (i.e. out0 connected to in1 and out1 connected to in2). out1 or out2 can trigger the adc, selected by a jumper . ct0 is clocked by a fixed 1mhz square wave. referring to the modes defined in the 8254 data sheet, the recommended programming is: ? ct0 set to mode 3, count 3 (generate a 4 m sec period square wave) ? ct1 set to mode 2, count for selected timing period (rate generator multiple of 4 m sec) ? ct2 set to mode 2 (if required for longer periods)
page 7 2192-09062-000-000 j266 pcad 12/16h i/o map a value written to the pointer register is used to select the function register next to be accessed. the dedicated registers for adc data can be read without first setting the pointer . this board occupies four consecutive addresses and must be set to an address which is a multiple of 4. (e.g. 180h, 184h, 200h) i/o function registers * y ou may obtain a data sheet from arcom t echnical support by t elephoning: +44 (0)1223 410 457 adc data registers address read/w rite register name register function base base + 1 base + 2 base + 3 w rite only read/w rite read only read only pointer register function registers adc low byte adc high byte select data register on-board data/control ls data from adc ms data from adc address register name data bit function base + 2 base + 3 adc low byte adc high byte bit 0-3 bit 4-7 bit 0-7 mpx channel address adc data bit 0-3 adc data bit 4-1 1 pointer v alue (hex) read/w rite function register name 00 01 02 03 08 09 0a 0b 80 81 w rite w rite read read read/w rite read/w rite read/w rite w rite w rite read channel select gain select (full scale range) software t rigger status ct0 ct1 ct2 ctc control user led board identification data bit function bit 0-3 bit 4-7 bit 0-1 none bit 0 bit 0-7 bit 0-7 bit 0-7 bit 0-7 bit 0 only bit 0-7 channel mpx address expansion address 0 = 10v range 1 = 5v range 2 = 1v range 3 = 0.5v range 0 = data available see data sheet for 8254* see data sheet for 8254* see data sheet for 8254* see data sheet for 8254*
page 8 2192-09062-000-000 j266 pcad 12/16h links and switches default link position diagram base address switches the three rotary switches adjust the base address of the board. a hexadecimal value for the address is shown directly in the dial windows. board functions lk1 interrupt selection this link is optional. if interrupts are required, fit either lk1a or lk1b. lk2 uni-polar , bi-polar conversion rate the full-scale range of the adc is set by the program. these links determine whether the input range is 0 to full-scale or full-scale. lk3, lk5, lk6 sampling enable one of these links must be in place for the adc to operate. normally only one of the three links should be fitted. lk5 lk2 lk4 lk7 lk3 a a b b lk1 lk1a irq2 lk1b irq3 lk2a bi-polar input range ( full-scale) lk2b uni-polar input range (0 to full-scale) lk3 enable hardware t rigger lk5 enable software t rigger + +
page 9 2192-09062-000-000 j266 pcad 12/16h lk4, adc clock rate this link is hard wired at the factory to suit the speed of the adc chip fitted. lk7, ctc select periodic triggering of the adc is either driven from ct1, for shorter periods, or ct2, longer . lk7a t rigger from ct1 lk7b t rigger from ct2 + user configuration record diagram lk5 lk4 lk7 lk1 lk2 lk3 a a b b link lk1a lk5 lk7a lk7b lk1b lk2a lk2b lk3 default user
page 10 2192-09062-000-000 j266 pcad 12/16h calibration pcad12/16h is accurately adjusted before leaving the factory , but may need re-calibration from time to time. the five trimmers on the board are intended to give fine adjustments only . calibration will require a precision voltage source, a 5 digit dvm (or better) and a test program such as pci216.bas or adst a t8.c (utility disk). vr1, vr2, input amplifier l set the board for uni-polar conversion l connect all inputs to analogue 0v l t rim vr2 to a small reading e.g. 000ch l switch through all gain settings and check the readings for all ranges l t rim vr1 and vr2 progressively until all readings are the same (ideally 0000h to 0001h) vr3, uni-polar gain l set the inputs to exactly half-scale l select the required gain range l t rim vr3 until the display reading is 0800h vr4, vr5 bi-polar gain and zero l select the required gain l set the inputs to exactly 0v l t rim vr5 until the display reading is 0800h l set the input to positive half-scale l t rim vr4 until the display reading is 0c00h l set the input to negative half-scale
page 11 2192-09062-000-000 j266 pcad 12/16h ribbon cable no. d-50 pin no. signal t itle 1 1 34 3 2 4 5 6 7 8 9 10 1 1 12 13 14 15 18 2 35 19 3 36 20 4 37 21 5 38 22 0v 0v inp0+ inp0- inp1+ inp1- inp2+ inp2- inp3+ inp3- 0v a inp4+ inp4- inp5+ 16 6 inp5- 17 39 inp6+ 18 23 inp6- 19 7 inp7+ 20 40 inp7- 21 24 0v a 22 8 23 41 inp8+ 24 25 inp8- 25 9 inp9+ 26 42 inp9- 27 26 10 43 27 1 1 44 28 12 45 29 13 46 30 39 38 37 36 35 34 33 32 31 30 29 28 inp10+ inp10- inp1 1+ inp1 1- 0v a inp12+ inp12- inp13+ inp13- inp14+ inp14- inp15+ 14 40 inp15- 47 41 0v a 31 42 /rconv 15 43 ax0 48 44 ax1 32 45 ax2 16 46 ax3 49 47 -12v 33 48 +12v 17 49 +5v 50 50 +5v sga te connectors d-50 output connector (pl2) pin assignments because most people will use ribbon cables with this board, the d-50 pin assignments are shown with the corresponding ribbon cable number , 1 to 50. for ease of reference, the corresponding d-type connector pins are shown on the circuit diagram. the pin-out conforms to the arcom signal conditioning system (scs).
page 12 2192-09062-000-000 j266 pcad 12/16h installation for ce compliance t o maintain compliance with the requirements of the emc directive (89/336/eec), this product must be correctly installed. the pc in which the board is housed must be ce compliant as declared by the pc manufacturer . the external i/o cable should be the arcom cab50ce, or a fully screened cable to the same pattern. 1. remove the cover of the pc observing any additional instructions of the pc manufacturer 2. locate the board in a spare isa slot and press gently but firmly into place 3. ensure that the metal bracket attached to the board is fully seated 4. fit the bracket clamping screw and firmly tighten this on the bracket note: good contact of the bracket to chassis is essential 5. fit the screened i/o cable to the 50-way board connector 6. ensure that the jack screws for the cable connector are tightened (use a screw driver) 7. replace the cover of the pc observing any additional instructions of the pc manufacturer the following standards have been applied to this product: bs en50081-1: 1992 generic emissions standard, residential, commercial, light industry bs en50082-1: 1992 generic immunity standard, residential, commercial, light industry bs en55022 : 1995 ite emissions, class b, limits and methods
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