Technical data

Chapter 9 147
Programming Examples
Programming in C Using the VISA
Programming Examples
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 VISA interface name and the device address. The interface name
is determined when you run the VISA 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.
secondary
address This optional parameter is the secondary address of the
GPIB device. If no secondary address is specified, none
is assumed.
host
address The IP address (in dotted decimal notation) or the name
of the host computer/gateway.
LAN device
name The assigned name for a LAN device. The default is
inst().
INSTR This is an optional parameter that indicates that you
are communicating with a resource that is of type
INSTR, meaning instrument.
NOTE If you want to be compatible with future releases of VISA and VISA,
you must include the INSTR parameter in the syntax.
The following are examples of valid symbolic names:
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]
TCPIP TCPIP [board]::host address[::LAN device name]::INSTR