HP 9112 manual D/A Conversion, DMA Transfer Dmax

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DMA Transfer (DMAX)

The DMA (Direct Memory Access) bus master allows data to be transferred directly between the PCI-9112 and the PC memory at the fastest possible rate, without using any CPU time. The A/D data will be queue at local FIFO on the PCI-9112 itself and it is automatically transferred to PC's memory.

The DMA transfer mode is very complex to program. It is recommended to use the high level program library to operate this card. If you wish to program the software which can handle the DMA bus master data transfer, please refer to more information about PCI controller.

4.3D/A Conversion

The operation of D/A conversion is more simple than A/D operation. You only need to write Digital values into the D/A data registers and the corresponding voltage will be output from the AO1 or AO2. Refer to

section 4.3 for information about the D/A data registers. The mathematical relationship between the Digital number DAn and the output voltage is formulated as following:

Vout = −Vref ×

DAn

4096

where the Vref is the reference voltage, the Vout is the output voltage, and the DAn is the Digital value in D/A data registers.

Before performing the D/A conversion, users should care about the D/A reference voltage which set by the JP3 and JP4. Please refer section 2.8 for jumper setting. The reference voltage will effect the output voltage. If the reference voltage is -5V, the D/A output scaling will be 0~5V. If the reference voltage is -10V, the D/A output scaling will be 0~10V.

The PCI-9112 has two unipolar analog output channels. To make the D/A output connections from the appropriate D/A output, please refer Figure 3.8.

-5 or -10 INT or Ext

	Ref In		Pin-30 ( AO0)
	Ref In		Pin-32 ( AO1)
	D/A Converter	餟	Pin-32 ( AO1)
	D/A Converter	餟	ToD/A Output
		儜	ToD/A Output
		儜
			Pin-14 ( A.GND)

Analog GND

Figure 4.3 Connection of Analog Output Connection

Operation Theorem ∙ 33

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Contents Page Trademarks ALL Rights ReservedQuestions Adlink Technology IncDetailed Company Information Page Contents Conversion Digital Input and Output Conversion9112DO 9112DA 9112ADSetChannel 9112ADSetRange 9112DblBufferTransfer 9112GetOverrunStatusWhat do you need VR Assignment Adjustment Appendix A. Demo. Programs Product Warranty/ServiceSoftware Utilities PCI Scan UtilityHow to Use This Guide Introduction ∙ FeaturesT r o d u c t i o n Applications SpecificationsAnalog Input A/D Analog Output D/AProgrammable Counter General SpecificationsDigital I/O DIO PCIS-LVIEW LabVIEW Driver Software SupportingProgramming Library DAQBenchTM ActiveX Controls PCIS-VEE HP-VEE DriverDASYLabTM PRO PCIS-DDE DDE Server and InTouchTMWhat You Have Installation∙ Installation Unpacking Device Installation for Windows SystemsInstallation ∙ PCI-9112 Layout PCB LayoutConverter PCI -Bus ControllerPCB Layout of the PCI-9112 CPCI-9112 Layout10 ∙ Installation Jumper SettingsAnalog Input Channel Configuration D/A Reference Voltage Setting Clock Source Setting12 ∙ Installation Internal Reference Voltage SettingPin Assignments of PCI-9112 Connectors Pin AssignmentsCN 3 Analog Input / Output & Counter/Timer 14 ∙ Installation CN 1 Digital Signal Input DI 0CN 2 Digital Signal Output do 0 Pin Assignments of cPCI-9112 16 ∙ Installation Hardware Installation OutlineConnect with ACLD-8125 Daughter Board ConnectionConnect with ACLD-9137 Connect with ACLD-9182Connect with ACLD-9138 and ACLD-9188 18 ∙ InstallationConnect with ACLD-9185 Registers Format ∙ G i s t e r s F o r m a tI/O Registers Map 20 ∙ Registers Format A/D Data RegistersD/A Output Register 22 ∙ Registers Format A/D control RegisterMode MUX Register Bit8 ~ Bit5 Auto-Scan Bit24 ∙ Registers Format Software Trigger Register A/D Status Register26 ∙ Registers Format Digital I/O registerLow Level Programming Internal Timer/Counter RegisterHigh Level Programming E r a t i o n T h e o r e m Analog Input Signal ConnectionA/D Conversion 28 ∙ Operation TheoremOperation Theorem ∙ Single-ended ModeDifferential input mode 30 ∙ Operation Theorem 4 Floating source and differential inputTimer Pacer Trigger 1 A/D Conversion Procedure2 A/D Trigger Modes Software triggerExternal Trigger 3 A/D Data Transfer ModesSoftware Data Transfer Drdy Interrupt Transfer IntxDMA Transfer Dmax D/A Conversion34 ∙ Operation Theorem Digital Input and OutputCounter Timer/Counter OperationPacer Trigger Source General Purpose Timer/ CounterAddress 36 ∙ Operation TheoremControl Byte 38 ∙ Operation Theorem Mode Definitions++ Library ∙ Libraries Installation+ + L i b r a r y Naming Convention Programming GuideData Types 40 ∙ C/C++ LibrarySyntax 9112InitialArgument Return Code9112DI Channel 9112DIDescription 42 ∙ C/C++ Library9112DO 44 ∙ C/C++ Library 9112DA9112ADSetChannel 46 ∙ C/C++ Library 9112ADSetRangeCardnumber the card number of PCI-9112 10 9112ADSetMode48 ∙ C/C++ Library 11 9112ADSetAutoscan12 9112ADSoftTrig 50 ∙ C/C++ Library 13 9112ADAquire14 9112ADDMAStart 52 ∙ C/C++ Library 15 9112ADDMAStatus 54 ∙ C/C++ Library 16 9112ADDMAStop17 9112ContDmaStart 56 ∙ C/C++ Library 18 9112CheckHalfReady20 9112GetOverrunStatus 19 9112DblBufferTransfer58 ∙ C/C++ Library 21 9112ContDmaStop22 9112ADINTStart 60 ∙ C/C++ Library 23 9112ADINTStatus24 9112ADINTStop 25 9112ADTimer62 ∙ C/C++ Library 2MHz / c1 * c227 9112TIMERRead 26 9112TIMERStart29 9112AllocDMAMem 28 9112TIMERStopArgument cardnumber countervalue 64 ∙ C/C++ Library32 9112GetSample 30 9112FreeDMAMem66 ∙ C/C++ Library Calibration ∙ CalibrationWhat do you need VR Assignment A/D AdjustmentBipolar Calibration Unipolar Calibration2 D/A Channel Calibration D/A AdjustmentReference Voltage Calibration 70 ∙ Software Utility Software UtilitiesSoftware Utility Running the Utility System ConfigurationCalibration Software Utility ∙72 ∙ Software Utility Functional TestingPCI Scan Utility DOS Software P e n d i x a . D e m o O g r a m sWindows 95 DLL Appendix a Demo Programs ∙74 ∙ Appendix a Demo Programs Product Warranty/Service ∙ Product Warranty/Service