Agilent Technologies E4406A VSA manual

Programming Examples

Using C Programming Over Socket LAN

*E4406A Examples:

*Query the center frequency:

*lanio 15.4.43.5 ’sens:freq:cent?’

*Query X and Y values of marker 1 and marker 2 (assumes they are on):

*lanio my4406 ’calc:spec:mark1:x?;y?; :calc:spec:mark2:x?;y?’

*Check for errors (gets one error):

*lanio my4406 ’syst:err?’

*

*Send a list of commands from a file, and number them:

*cat scpi_cmds lanio -n my4406

*

****************************************************************************

*

*This program compiles and runs under

*- HP-UX 10.20 (UNIX), using HP cc or gcc:

* + cc -Aa -O -o lanio lanio.c

*+ gcc -Wall -O -o lanio lanio.c

*- Windows 95, using Microsoft Visual C++ 4.0 Standard Edition

*- Windows NT 3.51, using Microsoft Visual C++ 4.0

*+ Be sure to add WSOCK32.LIB to your list of libraries!

*+ Compile both lanio.c and getopt.c

*+ Consider re-naming the files to lanio.cpp and getopt.cpp

*Considerations:

*- On UNIX systems, file I/O can be used on network sockets.

*This makes programming very convenient, since routines like

*getc(), fgets(), fscanf() and fprintf() can be used. These

*routines typically use the lower level read() and write() calls.

*- In the Windows environment, file operations such as read(), write(),

*and close() cannot be assumed to work correctly when applied to

*sockets. Instead, the functions send() and recv() MUST be used.

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