Chapter 1 17
Getting Started
Using LAN
Using Sockets LAN
Sockets LAN is a method used to communicate with the signal generator over the LAN interface using the
Transmission Control Protocol/ Internet Protocol (TCP/IP). A socket is a fundamental technology used for
computer networking and allows applications to communicate using standard mechanisms built into
network hardware and operating systems. The method accesses a port on the signal generator from which
bidirectional communication with a network computer can be established.
Sockets LAN can be described as an internet address that combines Internet Protocol (IP) with a device port
number and represents a single connection between two pieces of software. The socket can be accessed
using code libraries packaged with the computer operating system. Two common versions of socket libraries
are the Berkeley Sockets Library for UNIX systems and Winsock for Microsoft operating systems.
Your signal generator implements a sockets Applications Programming Interface (API) that is compatible
with Berkeley sockets, for UNIX systems, and Winsock for Microsoft systems. The signal generator is also
compatible with other standard sockets APIs. The signal generator can be controlled using SCPI commands
that are output to a socket connection established in your program.
Before you can use sockets LAN, you must select the signal generator’s sockets port number to use:
• Standard mode. Available on port 5025. Use this port for simple programming.
• TELNET mode. The telnet SCPI service is available on port 5023.
NOTE The signal generator will accept references to telnet SCPI service at port 7777 and sockets
SCPI service at port 7778.
An example using sockets LAN is given in Chapter 2 of this programming guide.
Using TELNET LAN
TELNET provides a means of communicating with the signal generator over the LAN. The TELNET client,
run on a LAN connected computer, will create a login session on the signal generator. A connection,
established between computer and signal generator, generates a user interface display screen with SCPI>
prompts on the command line.
Using the TELNET protocol to send commands to the signal generator is similar to communicating with the
signal generator over GPIB. You establish a connection with the signal generator and then send or receive
information using SCPI commands. Communication is interactive: one command at a time.
Using TELNET and MS-DOS Command Prompt
1. On the PC click
Start > Programs > Command Prompt.
2. At the command prompt, type in telnet.
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