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148 Chapter 9

Programming Examples

Programming in C Using the VISA

Programming Examples

XI0::24::INSTR Device at VXI logical address 24 that is of VISA type

INSTR.

VXI2::128 Device at VXI logical address 128, in the third VXI

system (VXI2).

GPIB-VXI0::24 A VXI device at logical address 24. This VXI device is

connected via a GPIB-VXI command module.

GPIB0::7::0 A GPIB device at primary address 7 and secondary

address 0 on the GPIB interface.

TCPIP::devicename@company.com::INSTR

A TCPIP device using VXI-11 located at the specified

address. This uses the default LAN Device Name of

inst0.

The following is an example of opening a device session with the GPIB

device at primary address23.

ViSession defaultRM, vi;

viOpenDefaultRM (&defaultRM);

viOpen (defaultRM, "GPIB0::23::INSTR", VI_NULL,VI_NULL,&vi);

viClose(vi);

viClose (defaultRM);

Closing a Session

The viClose function must be used to close each session. You can close

the specific device session, which will free all data structures that had

been allocated for the session. If you close the default resource manager

session, all sessions opened using that resource manager will be closed.

Since system resources are also used when searching for resources

(viFindRsrc) or waiting for events (viWaitOnEvent), the viClose

function needs to be called to free up find lists and event contexts.

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Agilent Technologies 11867A? Manuel de service Page 146