Programming Examples

C Programming Examples using VTL

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:

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]

 

 

 

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.

 

VXI logical

 

 

address

This is the logical address of the VXI instrument.

 

primary

 

 

address

This is the primary address of the GPIB device.

 

secondary

 

 

address

This optional parameter is the secondary address of the GPIB

 

 

device. If no secondary address is specified, none is assumed.

 

INSTR

This is an optional parameter that indicates that you are

 

 

communicating with a resource that is of type INSTR, meaning

 

 

instrument.

 

If you want to be compatible with future releases of VTL and VISA, you must

NOTE

 

include the INSTR parameter in the syntax.

 

The following are examples of valid symbolic names:

 

VXI0::24::INSTR

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

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Chapter 3

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Agilent Technologies Model A.08.xx manual Addressing a Session, Interface Syntax
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