Agilent Technologies E4440A, E4440-90189, E4443A, E4445A, E4446A, E4448A Using a Java Applet Over Socket LAN, Using a C Program Over Socket LAN, General LAN Troubleshooting

538 Chapter 6

Programming Fundamentals

Using the LAN to Control the Instrument

Programming Fundamentals

Using a Java™ Applet Over Socket LAN

There is a programming example in the PSA Measurement Guide and

Programming Examples that demonstrates simple socket programming

with Java. It is written in Java programming language, and will

compile with Java compilers versions 1.0 and above.

This program is also on the documentation CD ROM that shipped with

your product.

The PSA Measurement Guide and Programming Examples book

contains two examples of simple LAN socket programs. They are

written in C. One compiles in the HP-UX UNIX environment and one is

written for the WIN32 environment.

In UNIX, LAN communication via sockets is very similar to reading or

writing a file. The only difference is the openSocket() routine, which

uses a few network library routines to create the TCP/IP network

connection. Once this connection is created, the standard fread() and

fwrite() routines are used for network communication.

In Windows, the routines send() and recv() must be used, because

fread() and fwrite() may not work on sockets.

NOTE You may need to enable the termination character attribute when using

the VISA libraries for socket communication. If the termchar attribute

is disabled, then no termination character is sent with the data and the

bus will time out waiting for it. (Set vi_attr_termchar_en)

•“Troubleshooting the Initial Connection” on page 6-538

•“Common Problems After a Connection is Made” on page 6-540

•“Pinging the Instrument from a Computer or Workstation” on

page 6-542

•“EIA/TIA 568B Wiring Information” on page 6-544

Troubleshooting the Initial Connection

Getting the instrument to work with your network often requires

detailed knowledge of your local network software. This section

attempts to help you with some common problems. Contact your

network administrator for additional assistance.

The instrument LAN interface does not need or include any proprietary

driver software. It was designed to operate with common network

utilities and drivers.