Use Ping To Test The Connection; Open Ports On Firewalls; Web Page Problems - Keithley 3700A Series Reference Manual

Section 12: Troubleshooting guide

Use Ping to test the connection

Ping is a computer network administration utility that you can use to test whether a particular host can
be reached across an Internet Protocol (IP) network. It also measures the round-trip time for packets
sent from the local host to a destination computer, including the local host's own interfaces.
To run Ping:
1. From the Windows Start menu, type cmd in the Run box or Search box. The Command window is
displayed.
2. At the > prompt, type ping followed by the IP address. For example:
ping 169.254.52.51
Beware that some network devices, especially LXI instruments, can disable the ping response to
prevent denial of service attacks. This prevents hackers from pinging your instrument indefinitely,
which causes the instrument to become so busy it cannot respond to a web browser or instrument
driver.
If you cannot ping an instrument from the computer, you will not be able to communicate with the
instrument. You will need to check the LAN settings from the front panel of the instrument to see if
they match the configuration of your network.
If you can ping your instrument, you should be able to bring up the web page in the instrument from a
browser by typing the IP address in the address (URL) field.

Open ports on firewalls

A firewall is a part of a computer system or network that is designed to block unauthorized access
while permitting authorized communications. It is a device or set of devices that are configured to
permit or deny applications based on a set of rules and other criteria.
If you have a firewall in the network between your computer and the instrument, you need to make
sure the following ports are opened for UDP and TCP packets:
•
Port 80: Web server. This is normally open.
•
Port 1024: VXI-11 connection for sending and receiving commands from the instrument.
•
Port 5025: Raw socket connection for sending and receiving commands from the instrument.

Web page problems

All LXI instruments have a web server. The LAN configuration information on these pages is
mandated by the LXI consortium. For Keithley's LXI instruments, the standard LXI pages use
standard HTML.
The added value pages that Keithley has added to control the instruments use Java. If Java is not
installed when you select one of these instrument-specific web pages, the web page prompts you to
install it. To do this, your computer must have access to the Internet so it can access the web browser
plug-in Sun Java Runtime Environment Version 6 or higher. Installation files are available at the
download site
12-6
(http://www.java.com/en/download/manual.jsp).
Series 3700A System Switch/Multimeter Reference Manual
3700AS-901-01 Rev. D/June 2018
Java