HP NuDAQ I-9111DG/HR manual 6 A/D Data Format, Fff

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4.1.6A/D Data Format

The A/D data read from the FIFO is in the two‘s complement format. As the A/D gain is 1, the A/D signal range is roughly +10V ~ -10V bi-polar. In PCI-9111HR, the whole 16 bits A/D data are available. The relationship between voltage and the A/D data value is shown in the following table:

	A/D Data (Hex)	Decimal Value	Voltage (Volts)
	7FFF	+32767	+9.99969
	4000	+16384	+5.00000
	0001	1	+0.00031
	0000	0	0.00000
	FFFF	-1	-0.00031
	C000	-16384	-5.00000
	8001	-32767	-9.99969
	8000	-32768	-10.00031

Note: the decimal value of the A/D data is in the same sign with the bi-polar voltage. Therefore, the sign extension conversion is not necessary.

The A/D converted data of 12 bits PCI-9111DG is on the 12 MSBs of the A/D data. The 4 LSB of the 16 bits A/D data are the channel number and must be truncated by software. The relationship between voltage and the A/D converted data value is shown in the following table:

	A/D Converted	Decimal Value	Voltage (Volts)
	Data (Hex)	Decimal Value	Voltage (Volts)
	Data (Hex)
	7FF	+2047	+9.9951
	400	+1024	+5.0000
	001	+1	+0.0049
	000	0	0.0000
	FFF	-1	-0.0049
	C00	-1024	-5.0000
	801	-2047	-9.9951
	800	-2048	-10.0000

The formula between the A/D converted data and the voltage value is:

Voltage = AD_ data × 1 × 10

K gain

where gain is the value of the A/D gain control register. K=32768 for PCI-9111HR, and K=2048 for PCI-9111DG.

30 ∙ Operation Theorem

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Contents NuDAQ Trademarks Getting service from Adlink QuestionsPage B l e o f C o n t e n t s Features Applications Specifications Software SupportingPCI PnP Registers Address Map Libraries Installation Programming Guide Hardware Interrupt Clear RegisterConversion Interrupt ControlTable of Contents ∙ What do you need VR Assignment Adjustment 9111utilHow to Use This Guide Page Features IntroductionSpecifications ApplicationsUnipolar 0~10V Bipolar -10V~+10V Software Supporting Programming LibraryPCIS-LVIEW LabVIEW Driver PCIS-VEE HP-VEE DriverDAQBenchTM ActiveX Controls DASYLabTM PROPCIS-ICL InControlTM Driver PCIS-OPC OPC ServerInstallation ∙ Software Installation GuideWhat You Have UnpackingPCI-9111s Layout PCB Layout of the PCI-9111Hardware Installation Outline Jumper DescriptionsConnectors Pin Assignment Device Installation for Windows Systems∙ CN 1 Digital Signal Input DI 0 ~ ∙ CN 2 Digital Signal Output do 0 ~ ∙ CN 3 Analog Input/Output, Extended I/O, Trigger SignalsDaughter Board Connection Connect with ACLD-8125Connect with ACLD-9137 Connect with ACLD-9182Registers Format PCI PnP RegistersI/O Address Map A/D Data RegistersAddress Write Read I/O AddressA/D Channel Control Register Address Base + 0h Attribute read only Data FormatBit Address Base + 6h Attribute write only Data Format BitA/D Input Signal Range Control Register A/D Channel Read Back RegisterAddress Base + 6h Attribute read only Data Format Bit Address Base + 8h Attribute write only Data Format BitA/D Trigger Mode Control Register A/D Range and Status Read back RegisterAddress Base + 8h Attribute read only Data Format Bit Address Base + 0Ah Attribute write only Data Format BitAddress Base + 0Eh Attribute write only Data Format Bit Mode DescriptionAddress Base + 0Ch Attribute write only Data Format Bit 12 A/D Mode & Interrupt Control Read Back Register Hardware Interrupt Clear RegisterAddress Base + 48h Attribute write only Data Format Bit Address Base + 0Ah Attribute read only Data Format BitAddress Base + 4h Attribute read only Data Format Bit Address Base + 4h Attribute write only Data Format BitAddress Base + 2h Attribute read only Data Format Address Base + 2h Attribute write only Data Format Bit 15 D/A Output RegisterAddress Base + 40h ~ Base + 46h Operation Theorem A/D Conversion1 A/D Conversion Procedure 2 A/D Signal Source ControlAnalog Input Signal Connection Signal Range 3 A/D Trigger Source Control4 A/D Data Transfer Modes External Trigger EITS=1, TPST=don‘t careFifo Half-Full Polling Pre-Trigger Control EOC Interrupt TransferTime 6 A/D Data Format FFFInterrupt Control System Architecture IRQ Level SettingDual Interrupt System Interrupt Source Control Extended Digital I/O PortD/A Conversion 44mV 88mVTimer/Counter Operation Introduction Digital Input and OutputPre-Trigger Counter Pacer Trigger Source4 I/O Address Libraries Installation ++ LibraryProgramming Guide Naming Convention Data Types9111Initial 9111DO++ DOS ++ Windows9111DOChannel 9111DI9111DIChannel 9111EDI9111EDO 10 9111EDOReadBack11 9111SetEDOFunction 12 9111DA 13 9111ADReadData14 9111ADReadDataRepeat 15 9111ADSetChannel16 9111ADGetChannel 17 9111ADSetRange Input Range Gain Gain Code18 9111ADGetRange 19 9111ADGetStatus20 9111ADSetMode 21 9111ADGetMode 22 9111INTSetReg24 9111ResetFIFO 23 9111INTGetReg25 9111ADSoftTrigger 26 9111Set825428 9111ADTimer 27 9111Get825429 9111CounterStart 30 9111CounterRead31 9111CounterStop 32 9111INTSourceControl 33 9111CLRIRQ 34 9111GetIRQChannel35 9111GetIRQStatus 36 9111ADFFHFPolling37 9111ADAquire 38 9111ADHRAquire39 9111ADINTStart 40 9111ADFFHFINTStart ++ Library ∙61 41 9111ADINTStatus 42 9111ADFFHFINTStatus43 9111ADFFHFINTRestart 44 9111ADINTStop Calibration What do you needVR Assignment A/D AdjustmentFunctions of VRs D/A Adjustment Unipolar Analog Output Bipolar Analog Output9111util Software UtilityRunning 9111util.exe System Configuration Calibration Functional Testing Function Testing Menu WindowIeeprom Product Warranty/Service