User`s guide

Programming via LAN 5
Agilent VISA User’s Guide 133
Client/Server Model
The IO Libraries Suite software uses the client/server model
of computing. Client/server computing refers to a model in
which an application (the client) does not perform all
necessary tasks of the application itself. Instead, the client
makes requests of another computing device (the remote
I/O server) for certain services.
As shown in the following figure, a remote I/O client (a
Windows PC) makes VISA requests over the network to a
remote I/O server (such as a Windows PC, an E5810
LAN/GPIB Gateway, or a Series 700 HP- UX workstation).
Gateway Operation
The remote I/O server is connected to the instrumentation
or devices to be controlled. Once the remote I/O server has
completed the requested operation on the instrument or
device, the remote I/O server sends a reply to the client.
This reply contains the requested data and status
information that indicates whether or not the operation was
successful. The remote I/O server acts as a gateway between
the LAN software that the client system supports and the
instrument- specific interface that the device supports.