HP E8491A manual Optimizing Programs, Block Data Transfers

Page 36

Optimizing

Programs

Note

Block Data Transfers

HP VISA

ViSession defaultRM, id;

//open device (VISA) session to the HP E1563 viOpenDefaultRM (&defaultRM);

viOpen (defaultRM, “VXI0::24::INSTR”,VI_NULL,VI_NULL, &id);

SICL

INST id;

//open device (SICL) session to the HP E1563 id = iopen(“vxi,24”)

Or, to open an interface session to the HP E8491A:

INST id;

//open (SICL) session to the VXI interface id = iopen(“vxi”)

The HP E8491A IEEE 1394 interconnect uses the interface name VXI (or vxi). The interface number is assigned using the ‘I_O Config’ utility (Chapter 2). In the examples above, the logical address of the HP E1563 digitizer is 24 and INSTR indicates a VISA instrument control resource.

Programs that run over the IEEE 1394 serial bus are optimized by transferring data between the PC and the instrument in blocks. The following section identifies HP VISA and SICL functions that perform block transfers.

Refer to “Chapter 4: IEEE 1394 Fundamentals and Interface Overview” for detailed information on data transfers using the IEEE 1394 data transfer protocol.

VXIplug&play drivers for selected instruments contain functions that perform block transfers. You will need to consult the driver help file to determine if the driver for a particular instrument supports block transfers.

The following HP VISA functions perform block transfers over the IEEE 1394 serial bus:

viMoveIn8	viMoveOut8	viMove
viMoveIn16	viMoveOut16	viMoveAsync
viMoveIn32	viMoveOut32

36 VXI Programming Using the IEEE 1394 Serial Bus

Chapter 3

Image 36

Contents Contents Chapter Index Contents HEWLETT-PACKARD Warranty Statement Documentation History Manufacturer’s Name Page Business Reply Mail Page Interface Installation Configuration Component OverviewVXI Programming Using Ieee 1394 Serial Bus Additional InformationInterface Installation and Configuration Installing Ieee Host AdapterLayout of the Adaptec AHA-8940 1394-to-PCI Host Adapter Locating a PCI bus Expansion Slot Connecting the Power Cable Installing HP E8491A Interconnect Where to go NextPage Connecting the HP E8491A to the Host Adapter Installing VXI Instruments InstrumentsInstalling C-size Instruments Installing A- and B-size Instruments Shows the installation of A- and B-size instrumentsPage Interface Installation and Configuration Chapter Configuring the HP E8491A Interconnect 10. The HP IO Libraries Program Group11. The HP IO Libraries IO Config Utility Editing the HP E8491A Configuration 12. Editing the HP E8491A ConfigurationInstalling Editing the HP E8491A Configuration on Windows 95 PlatformsInstrument Drivers Verifying the Installation Viewing the Resource Manager Output 17 is a partial listing of a typical resource manager output Page Running the Resource Manager Page VXI Programming Using the Ieee 1394 Serial Bus Optimizing Programs Block Data TransfersBlock Transfers using HP VXIplug&play Drivers For i=0 i10 i+=2 Printf%lf\n\n,dataPtri*range/32768 Comments HP Visa Error checking routine Comments HP E8491A Triggering TTLTRG7 TTLTRG0Configuring the E8491A Trig In and Trig Out Ports ItrigallTurn off the autozero function iprintfe1412, Zeroauto OFF\n Program, ivxitrigroutee8491s, ITRIGEXT0 Using HP E8491A Shared Memory Locating E8491A Shared MemoryLocating Shared Memory Using HP Visa Starting address of E8491A shared Memory hexadecimal Storing Readings Shared Memory HP Visa Example #define E8491 VXI00INSTRUnsigned char ViClosefw E8491 Error handling function Storing Readings Shared Memory Sicl Example Ivxirminfoe8491, 0, &info startaddr = info.memstart Comments Ieee 1394 Fundamentals Interface Overview Ieee 1394 Topology and TerminologyFeatures of the Ieee 1394 Bus Terms shown in -1 are defined in the following tableOptimizing the Configuration Ieee Data Transfer ProtocolIeee 1394 Fundamentals and Interface Overview Chapter Adaptec AHA-8940 Host Adapter Interface Cable HP E8491A PC to VXI Interconnect PIN #Configuration Label Using the HP E8491A With the HP E1406 Command Module HP IO LibrariesInterface Characteristics VXI Characteristics GeneralCLK External Trigger InputExternal Trigger Output Trigger Delays Power Supply LoadingCooling Specifications Appendix a Editing the HP E8491A Resource Manager Configuration Configuration File OverviewPage Page Page Using ivxisc Utility Function OverviewPage Iclear Sicl interface name, logical address Page Index MXI Trig In specifications Index