Agilent Technologies N8201A Service Manual download pdf (Page 621)

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Programming Fundamentals 28

Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz 621

ViSession defaultRM, dmm, scanner;

viOpenDefaultRM(&defaultRM);

viOpen (defaultRM, "GPIB0::22::INSTR", VI_NULL,

VI_NULL, &dmm);

viOpen (defaultRM, "GPIB-VXI0::24::INSTR", VI_NULL,

VI_NULL, &scanner);

viClose (scanner);

viClose (dmm);

viClose(defaultRM);

The above function first opens a session with the default resource manager. The session

returned from the resource manager and a device address is then used to open a session

with the GPIB device at address 22. That session will now be identified as dmm when using

other VTL functions. The session returned from the resource manager is then used again

with another device address to open a session with the GPIB-VXI device at primary address

9 and VXI logical address 24. That session will now be identified as scanner when using

other VTL functions. See the following section for information on addressing particular

devices.

Addressing a Session

As seen in the previous section, the rsrcName parameter in the viOpen function is used to

identify a specific device. This parameter is made up of the VTL interface name and the

device address. The interface name is determined when you run the VTL Configuration

Utility. This name is usually the interface type followed by a number. The following table

illustrates the format of the rsrcName for the different interface types

The following describes the parameters used above:

board This optional parameter is used if you have more than one interface of the same

type. The default value for board is 0.

VSI logical address This is the logical address of the VXI instrument.

primary address This is the primary address of the GPIB device.

Interface Syntax

VXI VXI [board]::VXI logical address[::INSTR]

GPIB-VXI GPIB-VXI [board]::VXI logical address[::INSTR]

GPIB GPIB [board]::primary address[::secondary address][::INSTR]

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Agilent Technologies N8201A Service Manual Page 621

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