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36 VXI Programming Using the IEEE 1394 Serial Bus Chapter 3
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.
Optimizing
Programs
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.
Note Refer to “Chapter 4: IEEE 1394 Fundamentals and Interface Overview” for
detailed information on data transfers using the IEEE 1394 data transfer
protocol.
Block Data Transfers 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