Omega OME-A822PG manual General Description, Features

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1.Introduction

1.1General Description

The OME-A-822PGL/PGH is a high performance, multifunction analog, digital I/O board for PC AT compatible computers. The OME-A-822PGL provides low gain (0.5,1, 2, 4, 8). The OME-A-822PGH provides high gain (0.5,1,5,10,50,100,500,1000). The OME-A-822PGL/PGH contains a 12-bit ADC with up to 16 single-ended or 8 differential analog inputs. The maximum sample rate of the A/D converter is 100Ksample/sec. There are two 12-bit DACs with voltage output, 16 channels of TTL-compatible digital input, 16 channels of TTL-compatible digital output and one 16-bit counter/timer channel for timing input and output.

The following A/D performance bench marks were achieved on a 33MHz 486 computer:

z	Polling mode	: about 100Ksample/sec (with single-task OS)
z	Interrupt mode	: about 60Ksample/sec (with single-task OS)
z	DMA mode	: about 100Ksample/sec (with single-task OS)

1.2 Features

zThe maximum sample rate of the A/D converter is 100 K samples/sec

zSoftware selectable input ranges

zPC AT compatible ISA bus

zA/D trigger mode : software trigger , pacer trigger, external trigger

z16 single-ended or 8 differential analog input signals

zProgrammable high gain : 0.5,1,5,10,50,100,500,1000 (OME-A-822PGH)

zProgrammable low gain : 0.5,1,2,4,8 (OME-A-822PGL)

z2 channel 12-bit D/A voltage output

z16 digital input /16 digital output (TTL compatible)

zInterrupt handling

zBipolar/Unipolar operation

z1 channel general purpose programmable 16 bit timer/counter

OME-A-822PGL/PGH Hardware Manual ---- 4

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Contents User’sGuide Benelux CanadaMexico Czech RepublicOME-A-822PGH/PGL Tables of Contents IntroductionConnector Features General DescriptionAnalog Inputs SpecificationsPower Consumption 3 A/D ConverterDA Converter Digital I/OInterrupt Channel Programmable Timer/Counter Direct Memory Access Channel DMAApplications Product Check ListHardware Configuration Board LayoutI/O Base Address Setting Default base address isJumper Settings 1 JP1 D/A Internal Reference Voltage Selection2 JP2 D/A Int/Ext Ref Voltage Selection 3 JP3 Single-ended/Differential Selection4 JP4 A/D Trigger Source Selection 5 JP5 Interrupt Level Selection6 JP6 User Timer/Counter Clock Input Selection 7 JP7 DMA Dack Selection JP8 DMA DRQ Selection DRQ JP7 Dack JP8 DMAI/O Register Address Address Read Write1 8254 Counter 2 A/D Input Buffer RegisterConversion is completed, the Ready bit will clear to zero 3 D/A Output Latch Register 4 D/I Input Buffer Register Clear Interrupt Request6 A/D Gain Control Register GAIN3 GAIN2 GAIN1 GAIN0OME-A-822PGH Gain Control Code Table 7 A/D Multiplex Control Register8 A/D Mode Control Register 9 A/D Software Trigger Control Register 10 D/O Output Latch Register Digital I/O CN28254 Timer/Counter CounterA/D Conversion 1 A/D conversion flow Polling, interrupt and DMA2 A/D Conversion Trigger Modes 3 A/D Transfer ModesUsing software trigger and polling transfer Delay the settling time refer to Sec .4.6 and SecRefer to Sec D/A Conversion Analog Input Signal Connection OME-A-822PGL/PGH Hardware Manual OME-A-822PGL/PGH Hardware Manual Signal Shielding Use a single connection to frame ground not A.GND or D.GNDUsing OME-DB-8225 CJC Output CN1/CN2/CN3 Pin Assignment CN1 Digital Input Pin AssignmentCN2 Digital Output Pin Assignment SINGLE-ENDED Signal Mode Differential Signals OME-DB-37 Daughter BoardOME-DB-8225 OME-DB-16PCalibration Description of Variable ResistorsD/A Calibration A/D Calibration Diagnostic Utility IntroductionOME-A-822PGL/PGH Hardware Manual Running The Diagnostic Utility Setup Base address selection screenDMA no and IRQ no selection screen Calibration Function Test Test Test Screen Digital I/O Test Screen Multiplexer Test Screen Use IRQ Test Screen Use DMA Test Screen DA Gain Test Screen Timer 0 Test Screen Special Test Help WARRANTY/DISCLAIMER Temperature